Ornithologi

A studio for bird study

Tag: wildlife

Published in the Journal of Raptor Research: Dietary Plasticity in a Specialist Predator, the Gyrfalcon (Falco rusticolus): New Insights into Diet During Brood Rearing

by Bryce W. Robinson

Untitled-4-01

I’m privileged to once again see a painting of mine don the cover of the Raptor Research Foundation’s quarterly publication, the Journal of Raptor Research. This time, however, is more special since the painting of a Gyrfalcon carrying its prey, an Arctic ground squirrel, corresponds to the feature article authored by myself and Travis Booms, Marc Bechard, and David L. Anderson.

Our publication titled “Dietary Plasticity in a Specialist Predator, the Gyrfalcon (Falco rusticolus): New Insights into Diet During Brood Rearing” details patterns we documented through implementation of nest cameras in 20 Gyrfalcon nests in 2014 and 2015. The largest camera study of nesting Gyrfalcons provided us with many new insights into the biology of this species, some of which we have already published, some that we have not. In this publication, we document a previously undescribed shift in prey use throughout the nestling period, from a diet of mostly Ptarmigan early in the season, to squirrel in the late season. This shift to squirrel is an important consideration on many levels. It highlights the nuances to Gyrfalcon prey use in Alaska, and the potential importance of squirrels in the later season for juvenile success and development. The apparent importance of squirrels also has implications for understanding ecosystem changes and how shifts in prey landscapes may impact Gyrfalcon reproduction. The stage is set to explore further.

Below are a few photos that describe the work that went into producing this publication. These highlight a some of the >750,000 nest camera images we collected from which the diet was quantified, as well as photos of the field work, and the people that made this effort possible. 

You can read our paper in the Journal of Raptor Research here:

https://bioone.org/journals/journal-of-raptor-research/volume-53/issue-2/JRR-15-58/Dietary-Plasticity-in-a-Specialist-Predator-the-Gyrfalcon-Falco-rusticolus/10.3356/JRR-15-58.full

Gyrfalcon nest 1

A female Gyrfalcon feeds nestlings. Image copyright Bryce W. Robinson/The Peregrine Fund.

img_3763.jpg

A female Gyrfalcon feeds her newly hatched nestling, alongside hatching eggs. Image copyright Bryce W. Robinson/The Peregrine Fund.

Female Gyrfalcon feeds nestlings Arctic ground squirrel

Female Gyrfalcon delivers an Arctic ground squirrel to nestlings. Image copyright Bryce W. Robinson/The Peregrine Fund.

Gyrfalcon nest 2

A female Gyrfalcon stands alongside c. 14 day old nestlings. Image copyright Bryce W. Robinson/ The Peregrine Fund.

Gyrfalcon nest 3

Parental care photo 1. A female (left) broods newly hatched young, reluctant to leave the nest at the male’s (right) arrival. Every Gyrfalcon would occasionally look at the camera, as seen here, but were otherwise unaffected by its presence. Image copyright Bryce W. Robinson/The Peregrine Fund.

img_9591.jpg

Parental care photo 2. In some cases, males were keen to participate in brooding and feeding young, as is shown here. In even fewer cases, the females were tolerant of this behavior. Image copyright Bryce W. Robinson/The Peregrine Fund.

Bryce and Gyrfalcon nest camera

Bryce W. Robinson sights in a nest camera at a Gyrfalcon nest. Image by Caitlin M. Davis.

Bryce rappelling into Gyrfalcon nest

Bryce W. Robinson rappelling into a Gyrfalcon nest in western Alaska. Image by Neil Paprocki.

Special thanks to the following people that made the field work happen

IMG_9839

John Earthman and Tinsel

IMG_2285

Neil Paprocki

Ellen in Gyrfalcon nest with nestling

Ellen Whittle holding a Gyrfalcon nestling in 2015.

IMG_4683

Mark Jeter and Ellen Whittle against an Alaskan landscape in 2015.

Special thanks to the institutions that made this work possible: Boise State University, Alaska Department of Fish and Game, and The Peregrine Fund

Untitled-1-01

 

 

Advertisements

Bearded Vulture Illustration for HawkWatch International Shirt Design – Support Worldwide Vulture Conservation

by Bryce W. Robinson

Bearded Vulture

I was given the opportunity to provide a t-shirt design for HawkWatch International featuring the Bearded Vulture. The design and shirt are meant to both raise awareness and support for the important conservation science work of HWI focused on Old World vultures. Old World vultures are facing a myriad of threats that are impacting populations, to the point that most face extinction. Please, learn more about the work of HawkWatch International and consider helping in any way you can. Visit their website to read about the vulture work, and more.  

Click on the photo below to purchase a shirt, and support vulture conservation.

Screen Shot 2019-03-11 at 9.43.33 AM

Remembering Tom Cade: 1928-2019

by Bryce W. Robinson

IMG_1449.jpg

Showing Tom Cade an occupied Gyrfalcon nest with a nest camera, recording images for The Peregrine Fund’s Gyrfalcon Conservation Program.

Today I’m remembering Tom Cade, ornithologist and conservation giant. Tom passed away yesterday at the age of 91. His legacy is widespread, not only across the earth but through time, for generations into the future. Rather than describe this enduring legacy, I want to here describe one of my most cherished memories of spending time in the field with Tom as I showed him my study area during my Gyrfalcon work.

While I was conducting my field study on nesting Gyrfalcons in western Alaska, Tom came to visit for a few weeks. He stayed with me and Ellen Whittle, my field partner, in a small apartment in Nome. It’s hard to describe the conditions in such an apartment, but the few photos I’ve included here should be telling. I was so impressed with Tom, since he seemed entirely content to be in this run down shack of an apartment, cramped with two young ambitious biologists. In fact, I think he enjoyed it!

_MG_8479

Tom Cade and Travis Booms, walking along a tundra road on the Seward Peninsula.

Of course, we only spent time indoors when the rain wouldn’t allow otherwise. We made many trips out into the tundra to show Tom around, and Tom also spent time with Travis Booms and Joe Eisaguirre as they flew around the peninsula in a helicopter, accessing Gyrfalcon nesting sites. As we drove the roads with Tom, looking for wildlife and checking on raptor nests, we listened intently as Tom told stories of his last visit to the region nearly 60 years prior. He told us stories of a mid-tundra train wreck, seeing his first Gyrfalcon, and how the Nome area truly was different from his last visit, with more vegetation than he had previously recalled.

_MG_8545.jpg

Tom Cade, a man with an incredible legacy and an excellent sense of humor.

Apart from his unending wisdom and knowledge, I was impressed with Tom’s sense of humor. He was having fun, and wasn’t afraid to let it show. As is appropriate in western Alaska, July is a time for King Crab. With Tom in town, we had a great excuse to occupy our time during bouts of rainy weather with Crab feasts! I’ll never forget having crab with such excellent people, and I could tell from the photo above that Tom was having a great time as well.

IMGP0599.JPG

Crab Feast! Tom Cade, Bryce Robinson, Ellen Whittle, and Joe Eisaguirre. I think Joe was hitting his limit at this point. Photo courtesy of Travis Booms.

After Tom departed Nome and returned to his home in Boise, and I came home following the field season, we saw each other only intermittently. The last time I saw Tom Cade was in a meeting, only a few months ago. He listened, and only spoke when he needed to. But, he was participating. His passion was enduring, so much so that even until the last parts of his extraordinary life, he participated in the work he had set forth.

It is sad to see people go, but it provides us all a perspective on our lives, how we choose to live them, and who we are and want to be. Reflecting on Tom’s life has caused me to reflect on myself, and how I might honor and continue what the man did for multiple species facing extinction, and for the people he inspired, inspires and will inspire. I’ll take that spirit into the future, and do with it what I can.

IMG_0384

Generations of Gyrfalcon researchers: Bryce Robinson, David L. Anderson, Tom Cade, Travis Booms, and Mike Henderson.

If you’re unfamiliar with the legacy of Tom Cade, visit The Peregrine Fund’s website. Everything you see there is a testament to Tom’s legacy, and what he created. Also visit the following link for a great video highlighting Tom’s life: https://www.peregrinefund.org/people/cade-tom

American Ornithological Society Conference 2019 Logo

by Bryce W. Robinson

AOS2019-Logo-draft I-01

I am privileged to share the logo that I created for the American Ornithological Society’s 2019 conference. The logo features three Bar-tailed Godwit (Limosa lapponica baueri), a flagship bird for Alaska and a focal species for some of Alaska’s most influential ornithologists.

I worked closely with the conference planning chair, Colleen Handel of the USGS Alaska Science Center. We created a logo that ties in closely with the theme of the meeting – Birds on the Edge: Dynamic Boundaries. Colleen is part of a team of researchers headed by her husband, Robert E. Gill (also of USGS), that are responsible for discovering the incredible, sometimes 9 day non-stop flight of Alaska’s Bar-tailed Godwits as they return to Alaska from their wintering grounds in southeast Australia and New Zealand (see Gill et al. 2008). As such, one can see why the species is a great choice to celebrate the AOS meeting being held in Anchorage.

To register for the meeting or learn more, visit the AOS 2019 Conference website. Also, be sure to check out the merchandise that features this logo.