Showing posts with label Research. Show all posts
Showing posts with label Research. Show all posts

Friday, January 15, 2010

Longest Living Birds Are . . . [Extra, Extra!]

A study just published in the Journal of Zoology finds that the longest lived birds are large, social, vegetarian, and live on islands.

Large, social, vegetarian, island-dwelling birds live longer than other birds, reports a new Cornell study that examined the relationships between evolution and life spans in birds.

Some of the longest-living birds include flamingos, parrots, petrels and shearwaters, all of which can live 30 years and more, while many perching birds, grebes and woodpeckers have the shortest life spans of under 10 years, the researchers found.

So, what is it about island dwelling, body size, diet, and behavior that allows a longer life span?

. . . bigger birds have fewer predators; herbivorous birds avoid risks that carnivorous birds may face, such as getting hurt or picking up parasites and pathogens when attacking prey, and compared to carnivores, may find food more readily available; social species can mob and warn of predators, and may find safety or may hide in numbers; and island breeders face fewer predators, pathogens and parasites.

For more: read the press release, or the abstract and full text (note: abstract free, full text requires a subscription).

Meanwhile, I'm going to contemplate a move to the Caribbean.

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Thursday, August 13, 2009

On The Whole, I'd Rather Be In Philadelphia

And I am. In Philadelphia, that is, on the campus of the University of Pennsylvania, attending the 127th stated meeting of the American Ornithologists Union.



It's been a while since I've attended a scientific meeting and I'd forgotten how exhilarating they can be. Yeah, I know that sounds dweebish, but you know how it is, or at least I hope you do: when you're amongst your own chatting about everything and anything that relates to your passion you can't help but be energized. It's like a positive feedback loop that spirals into exciting ventures with old friends, newly-made acquaintances, and newly-minted ornithologists.

It's hearing the stories about major events in your field from the people who were at the center of those events.

It's discovering what we've recently learned about the subjects we're most interested in, what questions we've addressed and plugged those answers into the general body of knowledge . . . only to uncover more questions that need attention.

Good stuff.

Today started with Scott Weidensaul, author of absolute-must-reads such as "Living on the Wind" and "The Ghost with Trembling Wings" and others, presenting our host city as the Ornithological Cradle, a historical perspective how ornithology in the New World is all about Philadelphia. Bartram, Wilson, Audubon, and many more; the first banded birds, the horrific scenes from the Kittatinny Ridge that lead to the establishment of Hawk Mountain Sanctuary, and so much in between.

We all listened to Bob Ricklefs illuminate what he's discovered about Bird Comings and Goings in the West Indies. I listened to researchers present results of their long-term studies (still in progress; shouldn't they always be that way?) that showed effects of weather and habitat on a species or a suite of species. I learned what recent research is saying about bird collisions with windows, communication towers, and planes.

Unfortunately too many other sessions ran concurrently; I couldn't hear everything - I hope others are blogging about their sessions! Or at least there are some web archives somewhere.

Tomorrow will come too early - thankfully the coffee is free and bird-friendly.

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Monday, July 27, 2009

New Study: Cerulean Warblers Return to Same Wintering Ground

One aspect of birds I find absolutely mesmerizing is migration. As I watch the birds that arrive during the spring and choose to summer in our yard I can't help but wonder if they're the same birds I watched last year and if I'll see them again next year. I wonder where they are the rest of the year, and I generate vague pictures of the habitat I understand they use as stopover sites and where they choose to winter.

One reason I'm interested, apart from idle curiosity, is the answers directly affect how we approach conservation. The more you know and all that, because knowing is half the battle (leave it to G.I. Joe to turn that into a military action). And now we know a bit more about one of the warbler jewels, one that sadly doesn't breed in my yard. According to recent findings it appears "some individual Cerulean Warblers return to the same wintering area in succeeding years — something we’ve always suspected, but have never proven."

Image courtesy wikipedia.com

This is hopefully an important step forward for this species, one that is of conservation concern throughout its range. From the All About Birds species account,

Cerulean Warbler is one of the species of highest concern in the eastern United States because of a small total population size and significant declines throughout its range. Under consideration for listing under the Endangered Species Act. Listed on the Audubon Watchlist.

Read the Nature Conservancy's account of the report here.

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Saturday, July 25, 2009

Windpower and Migration

Author's note: there is a gratuitous lack of pretty pictures in this post. I'll be back on track next time.

My career has taken a few twists and turns over the years, all within the field of ornithology. My current path is studying bird vocalizations, specifically nocturnal flight calls -- short vocalizations given during sustained flight - a field I could never have comprehended back in my undergrad days. It's a fascinating field that is just starting to get widespread exposure, and if you know anything about me, you'll know I do love being on the cutting edge. But, and this is just between you, me, and the fencepost, I'm not really jazzed by pure research. I am the first to agree that knowledge for knowledge's sake is a worthy pursuit. But if my work doesn't apply to "the real world," if it's not directly making a difference on the ground one way or another, I feel jittery, like something's missing. Like a bird in an Emlen funnel, experiencing zugunruhe.

I find satisfaction knowing my efforts are directly making a difference. After noting a plateau in my day-to-day tasks, ones that seemingly affected no one by my personal mental health, I'm extremely happy to hear acoustic technology will play a role in studying the effects of windtowers on birds on migration. Earlier this summer a meeting, a big, important meeting, was held to discuss the state of where we stand and where we need to focus to adequately study this situation. The press release is below, and can be found on the American Bird Conservancy's web site.

I hope to post more about this field in the future, as studies progress and my involvement warrants it.


Scientists to Investigate Impacts of Wind Energy on Migratory Wildlife
Industry and conservation representatives set research priorities

Racine, WI & Ithaca, NY, July 23, 2009—Thirty top wildlife scientists have announced agreement on some of the highest research priorities to help America’s rapidly growing wind energy industry produce much-needed alternative energy—while also providing safe passage for birds and bats. This coalition of scientists from industry, government, nongovernmental organizations, and universities met recently in Racine, Wisconsin, to address unanswered questions about how continued wind energy development will affect migrating birds and bats. The meeting was hosted by the Cornell Lab of Ornithology, the American Bird Conservancy, and The Johnson Foundation at Wingspread.

“We see great potential in wind energy for addressing global climate change and reducing America’s reliance on fossil fuels,” said Dr. Michael Fry of the American Bird Conservancy. “It’s critical we act now to understand the interactions between wind energy installations and birds and bats.”


“Billions of birds migrate annually, taking advantage of the same wind currents that are most beneficial for producing wind energy,” said Dr. Andrew Farnsworth of the Cornell Lab of Ornithology. “We know that in some locations a small percentage of wind turbines may cause the majority of bird and bat deaths. For example, Altamont Pass, east of Oakland, California, is an extreme case: in an area used regularly by migrant and resident raptors, only a fraction of the 5,000 turbines are responsible for most of the raptor deaths annually. As wind power develops further, we need to know more about how placement, design, and operation impact birds and bats as well as how habitat and weather conditions affect potential hazards.”

The scientists addressed some of the critical information that could be collected using cutting-edge tools such as weather surveillance radar, thermal imaging, and microphones directed skyward to map migrations by day and night. New research will build upon monitoring and research studies of birds and bats before and after construction of existing wind energy facilities as well as work done by other researchers. The coalition appointed working groups to move this new research agenda forward. Top research priorities identified by the coalition include:

  • Studying bird and bat behaviors, and more accurately estimating mortality at existing wind turbines
  • Using current and newly-obtained information on bird and bat population numbers and distribution to focus research on critically important migratory routes and timing
  • Documenting how interactions of birds and bats with turbines are affected by factors such as weather, topography, and their distribution within airspace swept by wind turbine blades
  • Establish standardized methods for pre- and post-construction studies for assessing bird and bat behavior at wind facilities
  • Conduct research on best practices for mitigating the impacts of wind energy development on birds and bats

“Conducting this research will help the wind industry make informed, science-based decisions about where future wind energy projects can be built, and how they can be operated to minimize the impact on migrating wildlife, while still providing much-needed alternative energy,” said Dr. John Fitzpatrick, director of the Cornell Lab of Ornithology. “It will also help flesh out specific guidelines for wind farm construction being developed by the U.S. Fish and Wildlife Service.”

“Imagine if a similar effort had taken place at the turn of the 20th century with the auto industry and air quality,” said Kraig Butrum, President and CEO of the American Wind Wildlife Institute, an umbrella organization for the wind energy industry and environmental groups. “We’d probably be in a completely different place when it comes to global climate change and energy dependence, because we considered environmental impact from the start.”

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The American Wind Wildlife Institute is a nonprofit organization focused on timely and responsible development of wind energy while protecting wildlife and wildlife habitat through research, mapping, mitigation and public education on best practices in wind farm siting and wildlife habitat protection. Visit the AWWI website at www.awwi.org.

The Cornell Lab of Ornithology is a nonprofit membership institution dedicated to interpreting and conserving the earth’s biological diversity through research, education, and citizen science focused on birds. Visit the Cornell Lab’s website at www.birds.cornell.edu.

The American Bird Conservancy is a not-for-profit organization whose mission is to conserve native wild birds and their habitats throughout the Americas. Visit the ABC website at www.abcbirds.org.

The Johnson Foundation at Wingspread seeks to be a catalyst for environmental and community solutions using leading-edge convening models at a unique, world-class conference center. The Foundation brings together leading scholars and decision-makers from the public and private sectors, forms partnerships, commissions research and shares information to broaden the dialogue around environmental challenges and solutions. Guided by the belief that new solutions are needed to ensure the sustainability of environmental systems, the Foundation does not advocate specific solutions nor bring preconceived ideas to its work on any issue. Visit www.johnsonfdn.org to learn more.

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Friday, April 3, 2009

Here's Looking at You

Anyone who has trained their binoculars or a camera on a bird knows this scenario: you work your way into a position to view the bird, you raise your optics, as soon as the bird is in your field of view it takes off - like it knows you're looking at it.

Well, that's because it does, according to new research published this week in Current Biology. Auguste M.P. von Bayern and Nathan J. Emery found that hand-reared Jackdaws, a crow found in Europe and western Asia, were highly sensitive to the focus of human eyes and their communicatory function.

Jackdaw, courtesy of WikipediaThe Jackdaw, Corvus monedula, knows
when it's the center of attention.


From the paper:

Article summary
Humans communicate their intentions and disposition using their eyes, whereas the communicative function of eyes in animals is less clear. Many species show aversive reactions to eyes, and several species gain information from conspecifics' gaze direction by automatically co-orienting with them. However, most species show little sensitivity to more subtle indicators of attention than head orientation and have difficulties using such cues in a cooperative context. Recently, some species have been found responsive to gaze direction in competitive situations. We investigated the sensitivity of jackdaws, pair-bonded social corvids that exhibit an analogous eye morphology to humans, to subtle attentional and communicative cues in two contexts and paradigms. In a conflict paradigm, we measured the birds' latency to retrieve food in front of an unfamiliar or familiar human, depending on the state and orientation of their eyes toward food. In a cooperative paradigm, we tested whether the jackdaws used familiar human's attentional or communicative cues to locate hidden food. Jackdaws were sensitive to human attentional states in the conflict situation but only responded to communicative cues in the cooperative situation. These findings may be the result of a natural tendency to attend to conspecifics' eyes or the effect of intense human contact during socialization.

Click here for full article (PDF).

Citation
von Bayern and Emery, Jackdaws Respond to Human Attentional States and Communicative Cues in Different Contexts, Current Biology (2009), doi:10.1016/j.cub.2009.02.062

Jackdaw image from Wikipedia.

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