Ornithologi

A studio for bird study

Tag: journal

Just Published in Marine Ornithology: Unusual Foraging Observations Associated with Seabird Die-offs in Alaska

by Bryce W. Robinson

 

Above is a short video that I produced to supplement a paper I, along with colleagues at US Fish and Wildlife Service and USGS, just published in the journal Marine Ornithology. The video shows behaviors that we describe in the paper, and will hopefully help the reader visualize what we experienced ourselves.

The Bering Sea region is changing in many ways, but among the most sobering are the mass die-off events that are impacting the regions birdlife. These die-offs continue into this year. Since we put together this publication of the observations that I and colleagues made in 2016 and 2017, the trend has continued and is likely to continue into the future. Furthermore, on my most recent trip to the region I documented further evidence of the ongoing change that is occurring across the bering sea ecosystem. There is and will continue to be more to report.

Some of the change, such as the evidence of starving and ill affected storm-petrels that are the subject of our publication, is sobering and concerning. It hits hard on the hearts of those of us who so passionately pay attention to bird life across the globe. We care deeply about the well being of these creatures that fascinate us so much.

Some of the change, such as some of my most recent observations in the region, are exciting and stoke curiosity, as the birdlife of the region responds to the impacts of ecosystem disruption.

Ultimately, there will be winners and losers as life navigates anthropogenic driven change throughout the world. Mass die-off events will become the norm for some species, until their populations can no longer sustain such losses and they are eventually lost to our world. Others will adapt in ways we cannot yet imagine. Such adaptations will undoubtedly open our minds to processes and function in ecosystems that we are yet to understand.

Yes, climate change is a problem. It is a problem that still is not unanimously recognized. It will change our world, our way of life, and probably not for the better. But, as we experience the change, we can document what is happening for the future inhabitants of our perturbed ecosystems. We can make record of the oddities, the aberrations, so that we leave a paper trail of first observations that will help us understand when things started, and how they developed. Hopefully, as these records build the evidence of change will become insurmountable to the point that the overwhelming majority of our society cannot and will not deny that the world is impacted by our daily choices and we ourselves need to change. And when we do, hopefully it will not be too late.

This is why I want to publish notes such as this, to make a record that will add to the evidence of an increasingly disrupted world. More to come…

You can find the paper detailing our observations of odd foraging behaviors here:

http://www.marineornithology.org/PDF/46_2/46_2_149-153.pdf

Advertisements

Illustrations for a New Book on the Natural History of the Cooper’s Hawk by Robert N. Rosenfield

by Bryce W. Robinson

Screen Shot 2018-03-21 at 9.24.43 AM

I had the extreme privilege of contributing to Robert Rosenfield’s new book on the natural history of the Cooper’s Hawk (Accipiter cooperii). I illustrated the birds for the cover, as well as a figure in the book that describes the bowing courtship display.

COHA_bowing-online

Male Cooper’s Hawk Bowing display – Illustration for Robert N. Rosenfield’s new book on the natural history of the Cooper’s Hawk. 

I wasn’t able to find photos for reference to illustrate the bowing behavior, so I used Robert’s descriptions of the behavior, other illustrations such as that found in the BNA account, and a specimen that I prepared myself (housed at Boise State University’s Museum of Vertebrate Zoology). It was the first time I’ve relied largely on a specimen for an illustration, which turned out to be a very satisfying exercise that I hope to continue into the future of my work as an illustrator. 

IMG_0432.jpeg

This book is now available for prepurchase on Hancock House Publishers website. If you are a birder, naturalist, biologist, or simply bio-curious, then this book is certainly a must-have for your library, so make sure to get your copy now!

Melospiza Plate

by Bryce W. Robinson

If you like this painting, prints are available in the online shop.

Dark-eyed Junco Subspecies in Idaho’s Winter

by Bryce W. Robinson

Juncos_ID-online-01.jpg

For the Junco lovers that like this image, you can purchase a print by clicking on the image above.

Above is an illustration I just completed of some select subspecies of one of my favorite birds, the Dark-eyed Junco (Junco hyemalis) – Male and female “Oregon” (J. h. oreganus), “Pink-sided” (J. h. mearnsi), “Cassiar” (J. h. cismontanus), and the nominate “Slate-colored” (J. h. hyemalis). I think the junco is a favorite because it is polytypic, with some excellent variation in phenotypes throughout its range. I particularly am drawn to the Cassiar Junco because it is both difficult to diagnose (separate from Slate-colored X Oregon intergrades, if they even are different!) and little understood. For more information on this taxon, check out these links:

http://ebird.org/content/nw/news/dark-eyed-junco-races-oregon-slate-colored-and-cassiar/

http://nwbackyardbirder.blogspot.com/2011/04/not-slate-colored-junco-cassiar-junco.html

Here is information on its current and past taxonomic status:

https://avibase.bsc-eoc.org/species.jsp?avibaseid=DED1C8F9EE711FCF

I also like the Dark-eyed Junco because from what we understand regarding it’s phylogenetics, it is a very recent radiation. Speciation well in process! See this article for an explanation:

http://digital.csic.es/bitstream/10261/157693/5/POSTPRINT%20Mol%20Ecol%2025(24)%206175-6195%20(2016).pdf

Further, be sure to educate yourself with the Junco Projects great film – Ordinary Extraordinary Junco. I included a chapter of the film below that discusses the diversification of the species.

 

My illustration comprises the candidate subspecies that make up Junco flocks here in western Idaho. I chose to illustrate the male and female Oregon because they are by far the most common and provide the point with which to contrast and compare any outliers. The others are males, so as to provide simple examples of the other subspecies. Of course first-year and female types of these taxa can blend in appearance with the rest, which makes things much more challenging and fun.

Here I’ve included a rough and disorganized compilation of some information on what we currently understand about the Dark-eyed Junco and its sister species. There is a lot more out there, so if you love this as much as I do then be sure to explore more.

Here is a link and a few  references to investigate.

https://borjamila.com/speciation-mechanisms-junco-radiation/

Milá, B., P. Aleixandre, S. Alvarez-Nordström and John McCormack. 2016. More than meets the eye: lineage diversity and evolutionary history of dark-eyed and yellow-eyed juncos. In Snowbird: Integrative biology and evolutionary diversity in the junco. Ellen D. Ketterson and Jonathan W. Atwell (Eds.), Chicago University Press, Chicago.

Miller, A. H. 1942. Speciation in the Avian Genus Junco. The American Naturalist 76:211-214