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Wednesday, February 28, 2007
Taking Requests
I will probably retire the Birds of the Mid-Atlantic Series, which has gone about as far as I want to take it. By the end of last year, I found that my posts for that series had started to become somewhat repetitive - if not in subject matter then certainly in structure. Once that happened, I felt it was time to move on to something else. (I may still make an occasional post for that series, if something strikes me.)
So if there are any themes you would like me to cover here, please let me know, either by adding a note to the comments for this post, or sending an email to empidonax@gmail.com.
Tuesday, February 27, 2007
What Is RSS?
RSS stands for "Really Simple Syndication" (or "Rich Site Summary," or "RDF Site Summary"). An RSS feed is an XML file that contains an excerpt from each new post. An Atom feed has a different format but serves the same function. RSS provides a way for websites with regularly-updated content to let readers know that new content is available. Site feeds are popular with both blog writers and blog readers. Many newspapers and other websites also provide site feeds.
Site feeds have many uses. Some websites are devoted, in whole or in part, to aggregating feeds from other sites. Technorati, for example, links to each new post on any blog in their database. DCblogs has a page that uses site feeds to link to individual posts from many local blogs. Such websites are great if you like the subjects they follow. Chances are, though, that you follow sites from multiple subject areas. In that case, it makes more sense to subscribe to feeds via a newsreader service.
Subscribing
Why use RSS for reading blogs? Many blogs publish frequently, but not on a strict schedule. When you visit, you cannot be sure whether a new post or article will be available. Likewise, if you do not visit for a few days, you may miss some posts. An RSS feed notifies you when a new post is available on a site to which you subscribe. If you like a lot of different sites, it may be difficult to remember or time-consuming to visit each of them. RSS subscriptions are one way to organize and speed up blog reading. You can subscribe to RSS feeds by one of the following methods.
1. Browser-based newsreader. Browser-based newsreaders sit inside the browser and allow coordination between reading feeds and normal browsing activities. Such newsreaders are generally extensions or add-ons, like Firefox's Sage newsreader. (Sage is my primary newsreader.) It is fast and easy to use. Some browsers include a "Live Bookmarks" folder. Bookmarks saved in that folder will be marked when new content is available.
2. Desktop newsreader. These are stand-alone programs that are separate from the web browser and that manage and display site feeds. Some examples are listed here. (I do not use any desktop clients myself, so I cannot vouch for their quality.) Some email clients will also handle site feeds.
3. Web-based newsreader. Web-based newsreaders offer individual password-protected accounts where you can organize your feed subscriptions. The main advantage is that you can view your subscriptions away from your main computer. If you read blogs from several different computers, a web-based reader is probably the best solution. The disadvantage is that they tend to work a little more slowly than desktop or browser readers. Some examples are Bloglines, Newsgator, My Yahoo!, and Google Reader. (I have used Google Reader and found that the software is easy to use.) If you have an account at Technorati, you can follow your favorite blogs through that account via their favorites function. Those are only a few; several more readers are compared here.
4. Receive new posts by email. Some weblogs, including this one, give readers the option to receive posts by email. This service is coordinated by Feedblitz and uses the site feed to send messages. To receive this blog's feed in email format, add your email via the box at the top of the right-hand column.
There are more detailed tutorials on using RSS feeds here and here.
Publishing
Why publish a site feed? The one thing that unites all bloggers is a desire for people to read what we have to say. Site feeds make it easier for busy people to follow and read our postings. It is especially good for small and low-readership blogs. You might not get readers to visit every day, but if a reader subscribes to your feed, you know that your writings are getting read, or at least viewed, regularly.
There is a small downside to having people read posts via a newsreader. RSS readers will not see any notes or links on the sidebar, and will not notice any improvements to the page structure. RSS readers tend not to be counted in your sitemeter statistics, so you may see a small dip there. However, I believe that the good accomplished by building an audience more than makes up for the small dent in traffic.
So, here are a few options available if you publish a site feed.
1. Most bloggers publish feeds through their blog platform. This is the easiest route, especially since many platforms, including Blogger, make publishing a feed the default setting. In Blogger's case, the default feed is an Atom rather than RSS feed, but RSS is available as well. Here is a tutorial for how to enable or modify a site feed in Blogger.
2. Some bloggers choose to publish their feeds through a service like Feedburner. This is somewhat more complicated process than publishing through your blog platform. The main advantage is that Feedburner and similar services give detailed statistics about how many people subscribe and read the site feed.
3. Whichever publishing method you use, the site feed can be used as a proxy for an email list. One service that will do this is Feedblitz, which sends out notifications as new posts become available.
State Conservation Plans
The conservation plans for individual states are available at this website. The plan for D.C. is available here.
Monday, February 26, 2007
Rarities on the Loose
Closer to D.C., but still out of my reach, unfortunately, a thick-billed murre has been spotted at the Ocean City Inlet. See the details here and here.
Update: The ivory gull is now gone.
Sunday, February 25, 2007
Saturday, February 24, 2007
Non-Bird Notes from the Eastern Shore
Historic Highways
Many Washington-area birders travel to Delaware Refuges such as Bombay Hook and Prime Hook to view their concentrations of waterbirds and shorebirds in fall and spring. Many of the rural roads we travel to reach these refuges are also rich in history. Northern Delaware was an important corridor for the Underground Railroad. A portion of that network may be designated as a scenic and historic highway.
Travelers who make the journey from the Choptank River in Maryland to the Pennsylvania border will follow routes 10, 15, 9 and 299, passing more than 20 sites connected to the Underground Railroad. The landmarks include houses, churches, fields and vacant lots.One of my sisters has been working on this project and researching some of the sites for the past year."We are not pointing out one particular Underground Railroad route, but using contemporary roadways to touch on as many sites as we can to give people a sense of the passage from west to north and from the south to the north," said Debra Martin, preservation planner for the city of Wilmington.
Friday, February 23, 2007
Loose Feathers #87
News and links about birds, birding, and the environment.
- An experiment with scrub jays showed that some birds can plan for the future by storing food.
- A European team found the wintering grounds of the aquatic warbler, which apparently was a mystery until that discovery.
- Last weekend's cold snap killed 50,000 perch along the Potomac in St. Mary's County.
- A robot is being used to watch for ivory-billed woodpeckers in the Arkansas swamps. It is fitted with video cameras programmed to detect and record birds in flight. (When I first saw this headline, I imagined some kind of robobirder that looks like this, with binoculars in hand.)
- Occasionally I receive queries regarding types of birdhouses or birdfeeders that are best to attract birds. In some ways, the best first step to attract birds is to adapt gardening and landscaping to be bird-friendly.
- Of course, feeders are great, too. Here is a good article with tips on feeding birds. (This is quite detailed, and even better than some I have linked in past "Loose Feathers" editions.)
- The Invasive Species Weblog has a cautionary tale about controlling feral cats. On Macquarie Island, feral cats were eradicated to protect native bird species from excessive predation. The trouble is that once the cats were eliminated, populations of invasive rodents boomed.
- The Washington Post has an article on ecotourism, specifically for birding, in Panama.
- Finally, the birds are singing in Texas. If they have started singing there, spring here cannot be far away, either.
- The Great Backyard Bird Count received plenty of media attention last weekend. Here are stories from the Salt Lake Tribune, Seattle P-I, and Press of Atlantic City.
- There is still time to report sightings from last weekend if you have not done so already. Data entry will be open until February 28. Submit checklists here.
- Washington, D.C., is up to 64 species and 59 submitted checklists. Both have set new records for participation in the District. I will post another update once public data entry has closed.
- The East Valley Tribune has a delayed report on a CBC in Arizona.
Thursday, February 22, 2007
DNA Reveals Possible Bird List Changes
The project analyzed a small strand of mitochondrial DNA from each species sampled and compared the results against current taxonomy lists. It found that the vast majority (94%) of recognized bird species in North America correspond closely with distinct genetic clusters. Four percent are closely-related species represented by a single distinct cluster. Two percent of current species show two distinct clusters, suggesting the need for a split. (An academic paper describing the genetic barcoding project is available for free. The article describing the avian research is published in Molecular Ecology Notes, Comprehensive DNA barcode coverage of North American birds. If you cannot access the bird paper via the Blackwell link, try this pdf link. The project's website is here.)
Splits
In birding terminology, dividing a species into two or more is called a split and combining two or more species into one is called a lump. Species with a genetic variation over 2.5% were recommended for splits. The differences ranged from 3.1% in Northern Fulmar and Western Screech Owl to 7.9% in Marsh Wren. Potential splits are listed below. The genetic variation cited by the article corresponds to recognized subspecies with distinct geographic ranges. The Sibley Guide illustrates recognizable differences among different populations for most of these species. However, the differences are usually subtle, so field identification of new species will remain a challenge unless their range boundaries are clearly demarcated.
1 | Northern fulmar | Fulmaris glacialis |
2 | Solitary sandpiper | Tringa solitaria |
3 | Western screech owl | Megascops kennicottii |
4 | Warbling vireo | Vireo gilvus |
5 | Mexican jay | Aphelocoma ultramarina |
6 | Western scrub-jay | Aphelocoma californica |
7 | Common raven | Corvus corax |
8 | Mountain chickadee | Poecile gambeli |
9 | Bushtit | Psaltriparus minimus |
10 | Winter wren | Troglodytes troglodytes |
11 | Marsh wren | Cistothorus palustris |
12 | Bewick's wren | Thyromanes bewickii |
13 | Hermit thrush | Catharus guttatus |
14 | Curve-billed thrasher | Toxostoma curvirostre |
15 | Eastern meadowlark | Sturnella magna |
Lumps
The species that share close genetic characteristics are shown in the table below. Some of these are easily separable in the field, such as Black Duck vs. Mallard, the two teals, or the two eiders in breeding plumage. Others present real identification challenges, even though some individual species may be easily identifiable. Many birders may be relieved to see eight species of gulls lumped together, except for those who already have gone to the trouble of finding and identifying all of those species.
1 | Snow goose | Chen caerulescens |
Ross's goose | Chen rossii | |
2 | American Black duck | Anas rubripes |
Mallard | Anas platyrhynchos | |
Mottled duck | Anas fulvigula | |
3 | Blue-winged teal | Anas discors |
Cinnamon teal | Anas cyanoptera | |
4 | King eider | Somateria spectabilis |
Common eider | Scomateria mollissima | |
5 | Sharp-tailed grouse | Tympanuchus phasianellus |
Greater prairie-chicken | Tympanuchus cupido | |
Lesser prairie-chicken | Tympanuchus pallidicinctus | |
6 | Western grebe | Aechmophorus occidentalis |
Clark's grebe | Aechmophorus clarkii | |
7 | Laughing gull | Larus atricilla |
Franklin's gull | Larus pipixcan | |
8 | California gull | Larus californicus |
Herring gull | Larus argentatus | |
Thayer's gull | Larus thayeri | |
Iceland gull | Larus glaucoides | |
Lesser black-backed gull | Larus fuscus | |
Western gull | Larus occidentalis | |
Glaucous-winged gull | Larus glaucescens | |
Glaucous gull | Larus hyperboreus | |
9 | Red-naped sapsucker | Sphyrapicus nuchalis |
Red-breasted sapsucker | Sphyrapicus ruber | |
10 | Black-billed magpie | Pica hudsonia |
Yellow-billed magpie | Pica nuttalli | |
11 | American crow | Corvus brachyrhynchos |
Northwestern crow | Corvus caurinus | |
12 | Townsend's warbler | Dendroica townsendi |
Hermit warbler | Dendroica occidentalis | |
13 | Golden-crowned sparrow | Zonotrichia leucophrys |
White-crowned sparrow | Zonotrichia atricapilla | |
14 | Dark-eyed junco | Junco hyemalis |
Yellow-eyed junco | Junco phaeonotus | |
15 | Snow bunting | Plectrophenax nivalis |
McKay's bunting | Plectrophenax hyperboreus | |
16 | Great-tailed grackle | Quiscalis mexicanus |
Boat-tailed grackle | Quiscalis major | |
17 | Common redpoll | Carduelis flammea |
Hoary redpoll | Carduelis hornemanni |
So how does this affect birders? Probably not much, at least initially. Headlines for this story excitedly proclaim the discovery of potential new species. In fact, the North American bird list may see a net reduction if all of the proposed changes are accepted by the appropriate committees. Coverage has also suggested that the results, extrapolated to the whole world, may imply an additional 1,000 species to add to the 10,000 already recognized. Again, extrapolating results suggests that some species groups will also be condensed, so it is too soon to predict reaching the 11,000 mark.
This study is was designed as a test of the barcoding methodology, as the authors mention several times. As such, the DNA samples are too small to be used for distinguishing species based on genetics alone. The authors suggest that further DNA analysis will be necessary before any of the recommended splits or lumps are implemented. Even then, genetic analysis is only one factor among many in distinguishing separate species. Interbreeding, behavior, range, and physical appearance are among the other factors considered. There also seems to be some skepticism about the results in the wider birding and ornithological communities, so records committees are likely to move very slowly in acting on the recommendations.
Several other blogs have covered this story, including Search and Serendipity, Hawk Owl's Nest, and Nemesis Bird. There has been extensive discussion of the issue on the ID-Frontiers list. Snail's Tales has an unrelated post on defining species.
Wednesday, February 21, 2007
I and the Bird #43
Monday, February 19, 2007
GBBC Day 4: National Zoo
My strangest sighting of the day was a great blue heron. It was not particularly close to a body of water - either the creek or a good fishing spot. Instead, it was perched in a tree about fifty feet above the eagle enclosure.
Wood ducks and mallards were present in good numbers. A very large flock of mallards was feeding in the flamingo pond. I estimated about 120, though it was hard to count them because they were so densely packed together and moving around quickly. Almost all of the wood ducks were along the creek. The path by the creek, by the way, is still covered with snow and ice, though it is not as treacherous as the ice around Hains Point or the Arboretum.
I do not have photographs from this afternoon because I forgot to bring my camera with me.
Here is the checklist I submitted:
Wood Duck | 45 |
Mallard | 140 |
Great Blue Heron | 1 |
Cooper's Hawk | 2 |
Red-shouldered Hawk | 1 |
Red-tailed Hawk | 2 |
Ring-billed Gull | 2 |
Red-bellied Woodpecker | 4 |
Downy Woodpecker | 3 |
Hairy Woodpecker | 1 |
Pileated Woodpecker | 2 |
Blue Jay | 1 |
American Crow | 3 |
Fish Crow | 4 |
Carolina Chickadee | 2 |
Tufted Titmouse | 4 |
White-breasted Nuthatch | 1 |
American Robin | 60 |
Northern Mockingbird | 2 |
European Starling | 200 |
Song Sparrow | 1 |
White-throated Sparrow | 13 |
Northern Cardinal | 4 |
House Sparrow | 120 |
As of 8:55 pm, Washington is up to 63 species and 7,847 individuals for the count. So far 50 checklists have been submitted; this is just one short of the D.C. record. You can follow the D.C. results here. Data entry will be open until February 28, so you still have time to submit a report from this weekend if you have not done so already. I will post the final total at that time.
Sunday, February 18, 2007
GBBC Day 3: Potomac Waterfront
Today I ventured down to the Tidal Basin and Hains Point to look for birds. The Tidal Basin was almost completely frozen over, with only a few ring-billed gulls standing on the ice. The Washington Channel was also mostly frozen. It was frozen across in some places, open in others, and partly open with chunks of floating ice in other places. The areas around the boat docks on the far side of the channel were mostly open; these patches held small groups of mallards and coots. Hundreds of the three local gulls huddled in large flocks on the ice. Other waterbirds included a red-breasted merganser on the channel and a dozen lesser scaup on the Potomac. I was surprised to find seven great-blue herons during my walk; they must have fled from other areas in D.C. to find open water. About half way to the point, I saw a merlin perched in a tree. It was quite close to the road and did not flush when I approached. A juvenile bald eagle was perched on the large snag at the end of the golf course, while crows mobbed around it. Not too many songbirds were visible around the park. Most of the songbirds I saw were clustered in a few areas sheltered from the wind.
In the late afternoon I walked over to the Indian Museum to see what was around. Mostly the birds were the same as on Friday, but I did find a couple swamp sparrows in the museum's wetlands area. As I stood to watch them, a snow shower suddenly arrived. The flakes fell so densely that I could not see the Capitol from the Museum. The snow fell furiously, but the shower did not leave much behind.
Checklist from Hains Point and the Tidal Basin:
Canada Goose | 1,400 |
Mallard | 17 |
Lesser Scaup | 12 |
Red-breasted Merganser | 1 |
Great Blue Heron | 7 |
Bald Eagle | 1 |
Red-tailed Hawk | 1 |
Merlin | 1 |
American Coot | 6 |
Ring-billed Gull | 440 |
Herring Gull | 285 |
Great Black-backed Gull | 90 |
Rock Pigeon | 22 |
Mourning Dove | 1 |
Downy Woodpecker | 2 |
Blue Jay | 4 |
American Crow | 25 |
Fish Crow | 20 |
Tufted Titmouse | 6 |
Golden-crowned Kinglet | 1 |
American Robin | 40 |
Northern Mockingbird | 1 |
European Starling | 40 |
Cedar Waxwing | 11 |
Song Sparrow | 1 |
White-throated Sparrow | 4 |
Dark-eyed Junco | 3 |
Northern Cardinal | 2 |
House Sparrow | 35 |
Checklist from the Indian Museum and Capitol grounds:
Mallard | 60 |
Ring-billed Gull | 40 |
Downy Woodpecker | 1 |
White-breasted Nuthatch | 1 |
American Robin | 25 |
European Starling | 65 |
Swamp Sparrow | 2 |
White-throated Sparrow | 7 |
House Sparrow | 12 |
Birders in Washington, D.C., have now broken the record for species reported for the GBBC in this city. As of 8:30 pm, the count for D.C. stood at 60 species; the record had been 59, set in 2005. That year also set a record for the number of submitted checklists with 51. So far this year, 32 checklists have been submitted, so we are unlikely to reach that record. However, this year will have the highest number of individual birds reported, with 6,216 so far. Below is the distribution map as of Sunday night.
Saturday, February 17, 2007
GBBC Day 2: National Arboretum
The snow that fell on Tuesday and Wednesday is still present, but now it is covered with impenetrable ice. The icy conditions made it difficult to venture off the roadways, so I was not able to cover some birdy areas as thoroughly as I would have liked. For example, I did not venture into the Azalea Garden or Fern Valley, and I did not risk the steep trails of the Asian Gardens. Most water was frozen over, except for a few fast-running streams. The frozen water includes the Anacostia River, which was frozen across.
One of my goals today was to find the great horned owls that I had seen there before. Unfortunately, their roost was one of the areas made most inaccessible by ice. After slipping a couple times and then falling flat on my face, I decided to move on and look for other birds. A kestrel, seen near the columns, made up for missing the owls. Other good sightings included a brown thrasher and a yellow-bellied sapsucker near the Asian Gardens, cedar waxwings near Heart Pond, and field sparrows near the columns. Somehow, two belted kingfishers have managed to survive several weeks of freezing temperatures. This was the first visit to the Arboretum this year when I have not seen any eastern phoebes. I hope that they moved south rather than perishing. Robins, of course, were in their usual large winter flocks.
I ended up seeing just a few species short of what we saw on the Christmas Bird Count in the Arboretum. Here is my report from today:
Mallard | 3 |
Turkey Vulture | 1 |
Cooper's Hawk | 1 |
Red-tailed Hawk | 1 |
American Kestrel | 1 |
Ring-billed Gull | 20 |
Rock Pigeon | 50 |
Belted Kingfisher | 2 |
Red-bellied Woodpecker | 5 |
Yellow-bellied Sapsucker | 1 |
Downy Woodpecker | 2 |
Northern Flicker | 3 |
Pileated Woodpecker | 3 |
Blue Jay | 20 |
American Crow | 35 |
Fish Crow | 3 |
Carolina Chickadee | 4 |
Tufted Titmouse | 8 |
White-breasted Nuthatch | 9 |
Carolina Wren | 10 |
Eastern Bluebird | 9 |
American Robin | 350 |
Northern Mockingbird | 9 |
Brown Thrasher | 1 |
European Starling | 25 |
Cedar Waxwing | 7 |
Eastern Towhee | 6 |
Field Sparrow | 4 |
Song Sparrow | 2 |
White-throated Sparrow | 90 |
Dark-eyed Junco | 90 |
Northern Cardinal | 21 |
American Goldfinch | 18 |
As of now, D.C. is up to 45 species and 2,598 individuals on 21 checklists for the GBBC. Track updated results here. A map with the distribution of reports is below. It is still rather northwest-heavy.
Friday, February 16, 2007
GBBC Day 1: Birds of Downtown D.C.
In the late afternoon I counted birds around the east end of the Mall and then around my apartment. The reflecting pool was mostly frozen with a few open patches, one of which had a small group of gulls, while the other had a few mallards. Over at the Indian Museum, there was a very large flock of mallards (over 30), plus several song sparrows and white-throated sparrows. Oddly enough, I did not see any house sparrows while I was out walking. Usually there are at least a few at the Indian Museum.
Here is the sum of the two checklists I submitted for the Great Backyard Bird Count.
Mallard | 33 |
Ring-billed Gull | 51 |
Rock Pigeon | 25 |
Downy Woodpecker | 2 |
American Robin | 25 |
Northern Mockingbird | 1 |
European Starling | 68 |
Song Sparrow | 3 |
White-throated Sparrow | 10 |
House Finch | 1 |
House Sparrow | 6 |
As of the time of this post, 24 species have been reported in DC on 6 checklists. That is not too bad for the first day, though it is not anywhere near the leaders.
Loose Feathers #86
- This weekend, starting today, is the Great Backyard Bird Count. See my posts on the subject here and here. The count has received newspaper coverage from the Asheville Citizen-Times, the Cleveland Plain Dealer, the Orangeburg Times and Democrat, and the Fort Mill Times.
- A recent study suggests that wind farms at sea may be safe for seabirds. Land-based wind farms still face safety questions. A wind farm has been proposed for Virginia's Highland County.
- Following Nature Canada filing a lawsuit to protect piping plovers, the Canadian government has agreed to create new protection plans for piping plovers and other endangered species. The point in contention was that the old plans did not identify critical habitat, as required by law.
- The RSPB is pushing back against blaming wild birds for H5N1 outbreaks on poultry farms. In the recent case of an outbreak at a sealed turkey pen in Sussex, officials speculated that a wild bird somehow flew through a ventilation shaft to spread the virus. More background here. Meanwhile, tests on over 74,000 wild birds in North America have shown no trace of the disease.
- Some large Mediterranean bats may prey on birds that migrate at night.
- The U.S. Conference of Catholic Bishops sent a letter to members of Congress to urge action on climate change. (Via Treehugger.)
- A study found that people aged 50-64 have the largest "carbon footprint," but also feel the most strongly that government needs to take action to limit carbon emissions.
- Warming in the Antarctic is reducing krill populations and forcing penguins to move farther south.
- Birds Etcetera has a PSA about sign posts and raptors.
- A proposed development is threatening important habitat for the endangered Grenada dove. The government of Grenada proposes to sell national park land to the Four Seasons hotel chain for a new resort.
- Two red-tailed hawks in Wisconsin temporarily lost the ability to fly after they fell into a stream and ice formed on their wings. The birds are flying again now that the local humane society warmed them overnight.
Thursday, February 15, 2007
GBBC This Weekend
For such a large project to succeed, the GBBC needs the help of as many birders as possible. All birders, at any skill level, are invited to participate. You can spend as much or as little time counting as you wish. Watch birds in your backyard, a local park, or another favorite birding location. Keep a list of what you see and enter the data at the GBBC website. Detailed instructions are available here. (If you have not done the GBBC before, I recommend reading the instructions on the site before going out.) Note that you need not count birds at the same location every day, or even participate every day of the count period.
Reports from individual birders are gathered into a large database, which can be used for many projects. You can see some examples of how the data can be used in the results section of the website. One thing that the site can do is produce range maps for each species that has been reported in a given year. For example, here is last year's range map for black vultures.
Last year, birders in Washington, D.C., submitted a total of 39 checklists, identified 55 species, and counted 2,766 individuals. The reports from last year's count included peregrine falcon, gray catbird, fox sparrow, and purple finch. As you can see from the distribution map below, reports were concentrated in the northwest quadrant of the District.
Can we improve on those results this year? Let's try to get some reports from the eastern and southern parts of the city. Places like the National Arboretum, Kenilworth Aquatic Gardens, and Kingman Island are all fair game. How about the flocks of waterbirds down by Hains Point and the Tidal Basin?
Wednesday, February 14, 2007
Snow Day
Squirrels around here are unbelievably tame.
St. Valentine's Day
- Last year, I looked into the origins of the day.
- Warren and Lisa have a post with a series of bird couples.
- Audubon at Home has some stories about bird and birding couples.
Monday, February 12, 2007
Wind Turbines and Seabirds
The results will make it easier for energy companies and local governments to argue that wind power is safe, and should ease the consciences of conservationists. However, two things were not addressed, at least in the article. One, why are the results so different from some inland sites, like California's Altamont Pass, where birds are killed regularly? Perhaps the birds had more room to maneuver or the site had less of a choke point effect. Second, does the farm's presence have long-term effects beyond simply killing birds? It may be that the change in flight path is so slight that it does not make a difference, but if the shift involves hundreds of miles, it will mean extra energy expended between feeding stops.TADS [Thermal Animal Detection System] was developed to solve a problem specific to monitoring bird collisions at offshore wind farms, in this case the 80-turbine Horns Rev wind farm off Denmark's North Sea coast and the 72-turbine Nysted wind farm in the Baltic. The Danish researchers at Horns Rev and Nysted used visual monitoring and radar tracking, which showed that most birds avoided the farms altogether or flew down the half-kilometer-wide gaps between the wind farms' orderly rows of turbines. But the researchers still could not rule out the possibility that some birds were flying close enough to strike the turbine blades, which spin as fast as 80 meters per second at the tip. Of particular concern were larger seabirds, especially the common eiders that migrate through the area. "We were concerned that these large, rather clumsy birds might not be able to maneuver around the turbines," says Danish environmental institute researcher Mark Desholm, who designed TADS. ...
TADS was mounted on a Nysted wind-farm turbine that was situated in the most common flight path, and during more than 2,400 hours of monitoring that concluded last fall, it spotted only fifteen birds and bats and one moth flying near the turbine, and it recorded one collision involving a small bird or bat. Furness says that this provides confidence in estimations by Danish researchers that the Nysted wind farm would kill few common eiders.
Read the rest.
Accepting Climate Change
- In 1990, in its first report, the panel found evidence of global warming but said its cause could be natural as easily as human.
- In a landmark 1995 report, the panel altered its judgment, saying that “the balance of evidence suggests a discernible human influence on global climate.”
- In 2001, it placed the probability that human activity caused most of the warming of the previous half century at 66 percent to 90 percent — a “likely” rating.
The author also points out the diverse types of evidence cited by the review: rising temperatures, more droughts, more violent precipitation events, and fewer frosts, for example. We also now have a much longer climate record for comparison. The endpoint for warming is sobering.
I will probably have some more to say about the report in a future post when I have a chance to review it thoroughly. In the mean time, take a look at the linked essay.Some experts believe that no matter what humans do to try to rein in greenhouse gas emissions, a doubling is all but inevitable by 2100. In this view, the urgent task ahead is to keep them from rising even higher.
If the concentrations were to triple, and even if they just double, there is no telling at this point what the world will really be like as a result, except to speculate that on balance, most of its inhabitants probably won’t like it much. If James E. Hansen, one of the bolder climate scientists of the last two decades, is right, they will be living on a different planet.
Friday, February 09, 2007
Loose Feathers #85
- The American Bird Conservancy has released a list of the top twenty most threatened bird habitats in the United States. The only one present in D.C. is #19, early successional habitat in eastern forests; coastal beaches and marshes (#7) occur close by. More details are available in this pdf link. (via Wildbird on the Fly)
- Birder's World has an update on the Florida whooping crane and future plans for the breeding program.
- The Bush administration is considering removing the marbled murrelet population from the threatened species list. A review of population surveys by the USGS found that the population in Alaska and Canada had dropped 70% in the last 25 years.
- A German man that beat a golden eagle for attacking his dog has been fined $23,000. The court found that he was at fault because he had approached the eagle with his dog despite being warned of its presence.
- A great-tailed grackle has been documented in Wisconsin for the first time.
- The Maine Department of Environmental Protection plans to reduce buffers around shorebird areas from 250 feet to 75 feet. The buffers are designed to prevent human activities such as construction or tree clearing that could affect birds negatively. (Here's an opinion piece on the subject.)
- Paleontologists have linked a mass extinction 33.5 million years ago to a severe drop in temperature, of about 15 degrees. The climate estimate was based on an analysis of oxygen and carbon isotopes in the teeth of fossilized mammals.
- The U.N. Environment Programme has uploaded an atlas of environmental changes - including climate change hotspots - to Google Earth.
- California's Ocean Protection Council proposes to add plastics to the state's Redemption Value program because of the effects of plastics on seabirds.
- Here is a great photo of a European starling in sunlight. (Starlings tend to be a bit under-appreciated because of their ubiquity and effect on native birds, but they can be beautiful in the right conditions.)
- A Harris's sparrow has appeared in Ohio. Harris's sparrow is a central prairie species that rarely appears that far east.
Thursday, February 08, 2007
I and the Bird #42
Eagle Decision Delayed
Wildlife biologists within the department have proposed an alternate definition of "taking" that would include harassment short of injury or nest abandonment.But even before the widespread use of pesticides in the 1940s and 1950s caused the drop in the population, the eagle had been a target for people coveting its feathers, so Congress passed a law preventing the “taking” of any eagle. This word was broadly defined to include everything from hunting the bird to simply disturbing it.
Now, the department has proposed regulatory language narrowing that definition and making it harder to prove that human actions disturbed the bird. Under the new language, landowners and developers could cut down trees, build and engage in other activities in the vicinity of the bird and its nest as long as eagles were not killed or injured and did not abandon their nests.
Wednesday, February 07, 2007
Shooting a Cardinal
After 14 months of incessant attacks, Cardinalis held our family hostage. We tried everything to win our freedom and a little sleep. My husband and I wrapped sticky tape around tree branches and along window frames; we wove webs of fishing line across our five-foot windows, wired plaster cardinals to peripheral tree branches, propped mirrors in the gardens, placed plastic owls and stuffed toys in windows and baited a Hav-A-Heart trap with sunflower seeds. We threw stones at our tormentor and sprayed him with the garden hose, all to no avail.Birdchick suggests lodging a complaint with the NY Department of Environmental Conservation since the shooting violates the Migratory Bird Treaty Act. I myself wondered if the author had considered the possibility of subsequent legal action, since proclaiming the tale on the pages of a prominent national magazine would bring it to the attention of multiple conservation organizations and law enforcement officials. Perhaps penalties are subject to a statute of limitations.After living for 36 months under the siege of Cardinalis, I cracked. My sleep patterns had altered, my ability to concentrate (already declining with age) was spiraling down to about 30-second intervals. My hands were shaky, my head ached, my vision blurred. I had morphed from a cookie-baking granny to a crazed zombie. I turned away from my bleeding-heart pals toward those who enjoy a more pragmatic turn of mind—those who honor the way of the warrior.
Update: Birderblog has comments here, here, and here. Birds etcetera suggests that the incident may have been fabricated. Birdchaser warns against intemperate responses.
Monday, February 05, 2007
Two News Items
Unfortunately the situation is not likely to improve in the near term as large chunks of the federal budget have been devoted to other expensive projects. As birders, we can help by supporting the local "friends" associations. The linked article lists the ones for Bombay Hook and Prime Hook. There are similar organizations for Eastern Neck and Blackwater in Maryland. The organizations provide volunteers and find funding for projects that the refuges could not do on their own. The federal duck stamp program provides funding for land acquisition, but, to my knowledge, not for management.
Pedestrian Plan
My second item is not related to birds, but to life in the District. The DC government is putting together a pedestrian master plan, with the goals of encouraging more people to walk and reducing fatal pedestrian accidents. The website for the project is here; it includes a short survey on the walking conditions in the city. If you know of any dangerous intersections, take the survey and report them.
Update: Speaking of pedestrian hazards... A pedestrian was hit and killed by a bicyclist - a fairly unusual incident.
Sunday, February 04, 2007
Cranes Killed
Eighteen endangered young whooping cranes that were led from Wisconsin to Florida last fall to create a second migratory flock of the birds were killed in Friday's violent storms, a spokesman said yesterday.One crane, apparently, is still missing. Whether that means that it survived remains to be seen.
The cranes were being kept in an enclosure at the Chassahowitzka National Wildlife Refuge near Crystal River, Fla., said Joe Duff, co-founder of Operation Migration, the organization coordinating the project.
The Birdchaser has more thoughts on the subject.
Update: As it turns out, one bird did survive.
Saturday, February 03, 2007
Winter Birding at the Beach
On the drive to the next stop, we could see thousands of snow geese floating on one of the many coves to the west of the road. At Indian River Inlet we were greeted by the sight of a great cormorant flying out towards the ocean. Following the pattern from Ocean City, there was less waterfowl diversity than last year, with fewer numbers of the species that we did see. A small flock of long-tailed ducks patrolled the entrance to the inlet. Other than that we saw the same scoters, loons, and shorebirds as before.
Silver Lake in Rehobeth, the third stop, had its usual raft of canvasbacks. Alongside the canvasbacks was a large flock of ruddy ducks. Smaller numbers of black ducks, northern shovelers, and coots were also on the water here. A great blue heron worked the edges. This pond, nestled in the midst of housing developments, is a rather unremarkable location at first glance. Somehow it manages to be a waterfowl magnet year after year.
We capped off the day with two stops at Cape Henlopen State Park. Gordon's Pond, on the south side of the park, had more waterfowl, including tundra swans and northern pintail. A great egret and a half-dozen greater yellowlegs braved the winter cold. Two adult bald eagles were sitting on a log in the middle of the marsh. Bushes along the side of the trail held a hermit thrush and some yellow-rumped warblers.
From there we went to the north side of the park, the point of Cape Henlopen. The nature center feeders were sparsely populated by the time we arrived, with only chickadees, titmice, and juncos, plus a red-breasted nuthatch that I missed. Venturing out to the point, we found that the day had grown much colder and windier, made more obvious by the lack of protection from the northwest winds. Going out onto the beach was worth braving the wind chill, however, because we were rewarded with a flock of snow buntings that flew in and out of the dunes.
The list below reports the species I saw today. More images from today's trip are available here.
SPECIES SEEN: 58
Red-throated Loon
Common Loon
Northern Gannet
Double-crested Cormorant
Great Cormorant
Great Blue Heron
Great Egret
Mute Swan
Tundra Swan
Snow Goose
Canada Goose
Brant
Mallard
American Black Duck
Northern Pintail
Northern Shoveler
Canvasback
Long-tailed Duck
Surf Scoter
Bufflehead
Red-breasted Merganser
Ruddy Duck
Black Vulture
Turkey Vulture
Bald Eagle
Northern Harrier
Sharp-shinned Hawk
American Kestrel
Peregrine Falcon
American Coot
American Oystercatcher
Greater Yellowlegs
Ruddy Turnstone
Sanderling
Dunlin
Purple Sandpiper
Ring-billed Gull
Great Black-backed Gull
American Herring Gull
Bonaparte's Gull
Rock Pigeon
Mourning Dove
Eastern Bluebird
Hermit Thrush
American Robin
Carolina Chickadee
Tufted Titmouse
Fish Crow
European Starling
House Sparrow
American Goldfinch
Yellow-rumped Warbler
Song Sparrow
Dark-eyed Junco
Snow Bunting
Northern Cardinal
Red-winged Blackbird
Boat-tailed Grackle
Friday, February 02, 2007
Loose Feathers #84
- The Intergovernmental Panel on Climate Change has released a report that finds stronger evidence of anthropogenic warming. Temperature increases have occurred on the high end of the ranges given by their models. At least the White House has found a solution for global warming. (via RealClimate)
- Prince William Sound continues to feel effects from the Exxon Valdez spill in 1989. Oil lingers just beneath the surface of the shore, as it has dissipated at a rate of only 3-4% per year. Several species have not recovered their populations completely.
- Meanwhile, volunteers are doing their best to clean oiled birds from last week's slick near Devon in the U.K. The Devon County Council had discussed the effects of a potential spill only two days before the container ship ran aground.
- A team of researchers from New Jersey traveled to Tierra del Fuego to monitor red knot flocks on their wintering grounds. You can follow their progress on their blog, The Shorebird Project. See also The Red Knot Expedition (which may be a separate group).
- Recently there has been some movement on preserving more of the wintering territory of cerulean warblers. See Coffee and Conservation for details.
- Birders in North Carolina are upset about a naval airfield that will be built within four miles of the Pocosin Lakes NWR, a major wintering spot for waterfowl. Go here to read more about it.
- A man was recently arrested in Guyana for attempting to smuggle 11 birds to the United States aboard an airplane. It is unfortunate that there is a market here for protected species to encourage such smuggling.
Thursday, February 01, 2007
Great Backyard Bird Count Coming Soon
Here are some specific questions that the reports help to answer:
To participate, set aside at least 15 minutes sometime during the weekend of February 16-19. Count all the birds that you see during that period, and report the results on the GBBC website. Many report birds coming to their feeders, but the "backyard" in the title is not meant to be restrictive. If, like me, you live downtown in an urban area, you can also participate by counting birds in a park or natural area. The organizers of the count want to gather information on as many species as possible, many of which are not found in a typical backyard.* How will this winter's snow and cold temperatures influence bird populations?
* Where are winter finches and other “irruptive” species that appear in large numbers during some years but not others?
* How will the timing of birds’ migrations compare with past years?
* How are bird diseases, such as West Nile virus, affecting birds in different regions?
* What kinds of differences in bird diversity are apparent in cities versus suburban, rural, and natural areas?
* Are any birds undergoing worrisome declines that point to the need for conservation attention?
Last year, birders in DC reported 55 species and 2,766 individuals within the District. Can we improve on those this year?
Update: Several other bloggers have written about the coming count. See the links at Birdchaser and bootstrap analysis for more commentary on the subject.