tags: evolution, evolutionary biology, evolutionary ecology, plumage color,carotenoid-based colour, carotenoids, lipid peroxidation, oxidative stress, sperm motility, sperm quality, sperm velocity, birds, ornithology, Great Tit, Parus major, researchblogging.org,peer-reviewed research, peer-reviewed paper
Great Tit, Parus major.
Image: Luc Viatour, Creative Commons/Wikipedia [larger view]
In some species of birds, males are more brightly colored than females. This phenomenon is due to female choice: females choose to mate with males that have the brightest plumage colors and most elaborate…
bpr3.org/?p=52
grrlscientist | January 15, 2010tags: evolutionary biology, behavioral ecology, life history, migration, long-distance migration,birds,ornithology,researchblogging.org,peer-reviewed research, peer-reviewed paper
White-rumped sandpiper, Calidris fuscicollis, chicks on Bylot Island, Nunavut, Canada.
Image: Laura McKinnon [larger view]
I recently told you about research that used new microtechnology to document the incredible journey of Arctic Terns, a small bird species that annually migrates from its wintering area in Antarctica to its breeding colonies in Arctic and sub-Arctic regions of Europe, Asia, and North America…
grrlscientist | January 13, 2010tags: evolutionary biology, behavioral ecology, migration, microtechnology, geolocator, natural history, biological hotspots, longest migration, seabirds, Arctic Tern, Sterna paradisaea, researchblogging.org,peer-reviewed research, peer-reviewed paper
Arctic Tern, Sterna paradisaea, Iceland.
Image: Arthur Morris, Birds as Art, 2007 [larger view].
Canon 400mm f/5.6L lens (handheld) with the EOS-1D Mark III. ISO 200. Evaluative metering +1/3 stop: 1/1000 sec. at f/5.6 in Manual mode. Manual Flash with Better Beamer at 1:1.
For decades, it was widely suspected that a small seabird, the…
grrlscientist | January 7, 2010tags: evolutionary biology, immunology, immune response, antibodies, parasite, avian pox virus, Poxvirus avium, nest fly, Philornis downsi, birds, ornithology, Darwin's Finches, Medium Ground Finch, Geospiza fortis, Ecuador, Galapagos Islands, researchblogging.org,peer-reviewed research, peer-reviewed paper
A male Medium Ground Finch, Geospiza fortis, sits on a tree branch in Ecuador's Galapagos Islands.
Image: Jen Koop.
People often view the Hawaiian islands as a tropical paradise, the ideal vacation site, but you wouldn't agree with this assessment if you happen to be a bird. According…
grrlscientist | January 4, 2010tags: researchblogging.org, new species, insects, American cockroach, Periplaneta americana, DNA barcoding, Brenda Tan, Matt Cost, Mark Stoeckle, Rockefeller University, American Museum of Natural History, AMNH
Mystery cockroach found in NYC apartment.
Image: Brenda Tan and Matt Cost.
Moving overseas has been a challenge, but worst of all for me has been the fact that my writing has suffered. I still read scientific papers and science news stories, but have been unable to find the time necessary to write these stories for you. Hopefully, my life is returning to some semblance of…
grrlscientist | December 15, 2009tags: peer-reviewed paper, psychology, gift wrapping, wrapping paper, behavior, holidays, holidaze
Besides bright lights, my favorite thing about the holidays is wrapping gifts. I love covering a boxed gift with colored papers (or even with plain brown paper bags), I get tremendous satisfaction from folding the paper so it makes precise corners and then I especially enjoy decorating the wrapped gift with bows, ribbons and toy flowers and birds, christmas ornaments or other decorations. I also enjoy figuring out how to wrap unusually shaped objects. However, my most favorite thing to do is…
grrlscientist | September 10, 2009tags: researchblogging.org, global warming, climate variation, climate change, penguins, El Nino, marine zoning, P. Dee Boersma
Adélie penguins, Pygoscelis adeliae, and chicks.
(a) Adélie penguin chicks may get covered in snow during storms, but beneath the snow their down is warm and dry. (b) When rain falls, downy Adélie chicks can get wet and, when soaked, can become hypothermic and die.
Images: P. Dee Boersma.
According to an article that was just published in the journal BioScience, penguin populations are declining sharply due to the combined effects of overfishing and pollution…
grrlscientist | June 2, 2009tags: Post-Traumatic Embitterment Disorder, Post-Traumatic Stress Disorder, Adaptation disorder, stress reaction, Adjustment disorder, Negative life events, psychology, behavior, psychiatry, peer-reviewed paper
[larger view]
In this economy, nearly everyone has experienced unemployment, bankruptcy, foreclosure, divorce, or some combination thereof. But roughly 1-2% of these people become so stressed out by these losses that "they can barely function other than to ruminate about their circumstances," according to Dr. Michael Linden, the German psychiatrist who described and named Post-…
grrlscientist | April 8, 2009tags: microbiology, astrobiology, new species, Indian Space Research Organization, bacteria
Bacterial colonies.
Image: Hub Testing Laboratory [larger view].
According to a recently published press release, three new species of bacteria have been discovered in the upper stratosphere by Indian scientists in an experiment conducted by the Indian Space Research Organization (ISRO). This discovery lends some credence to the hypothesis that life might have originated elsewhere in the cosmos and was seeded on Earth after colliding with a foreign body, perhaps a comet or asteroid, that was…
grrlscientist | April 5, 2009tags: Eurasian Jackdaw, Corvus monedula, body language, behavior, peer-reviewed paper
Eurasian Jackdaw, Corvus monedula.
This is the smallest species of corvid (crows and ravens).
Image: Wikipedia [larger view].
Those of you who go birding will know what I am talking about when I say that birds are so capable of reading human body language that they know when we are looking at them, which frequently causes them to hide from our gaze. However, this capacity has never before been scientifically studied in birds, until now, that is.
A newly published paper studied handraised, tame Eurasian…
grrlscientist | March 25, 2009tags: evolutionary biology, speciation, species flocks, molecular phylogeny, behavioral ecology, Synodontis species, squeaker catfish, cuckoo catfish, Lake Tanganyika, peer-reviewed paper
The Cuckoo Catfish, Synodontis multipunctatus [Siluriformes: Mochokidae].
This is the only fish that is a known brood parasite.
This is one of the species included in this newly-published study.
Image: orphaned.
One of the groups of fishes that I worked with as an aquarist for nearly my entire life are the synodontids, often known as "squeaker catfish" for their ability to make high-pitched sounds. These…
grrlscientist | March 22, 2009tags: evolutionary biology, mate choice, sex determination, genetic compatibility, behavioral ecology, Gouldian Finch, Erythrura gouldiae, peer-reviewed paper
The three color morphs of Gouldian finches, Erythrura gouldiae.
Image: Sarah Pryke, Macquarie University.
Gouldian finches, Erythrura gouldiae, are small cavity-nesting passerines that are endemic to open savannahs adjacent to mangrove swamps in northern Australia. These finches eat a variety of native grass seeds, but to meet the increased energetic and nutritional demands of rearing chicks, they primarily eat insects when breeding…
grrlscientist | January 27, 2009tags: evolution, speciation, diversification rate, Zosterops, White-eyes, ornithology, birds, molecular phylogeny, South Pacific Islands
The Splendid (Ranongga) White-eye, Zosterops splendidus,
endemic to Ranongga Island in the Solomon Islands archipelago.
This species' home range is smaller than Manhattan Island.
Image: Chris Filardi [larger view].
For many decades, the white-eyes (Family: Zosteropidae) were known as the "Great Speciators" in honor of their apparent ability to rapidly give rise to new species while other birds in the same areas showed little or no diversification. But…
grrlscientist | December 24, 2008tags: parrots, Psittaciformes, evolution, molecular phylogeny, ornithology, Neornithes
Red-crowned Amazon parrot, Amazona viridigenalis, at Elizabeth Street Parrotry, Brownsville, Texas.
Image: Joseph Kennedy, 7 April 2008 [larger view].
Nikon D200, Kowa 883 telescope TSN-PZ camera eyepiece 1/750s f/8.0 at 1000.0mm iso400.
One of the most contentious issues among scientists who study the evolution of birds is identifying precisely when the modern birds (Neornithes) first appeared. This is due to conflicts between the fossil record and molecular dating methodologies. For example, fossils…
grrlscientist | December 15, 2008tags: evolution, honeyeaters, Meliphagidae, Mohoidae, birds, ornithology, birds, molecular phylogeny, extinct species, South Pacific Islands
Two nectar-feeding birds from Hawai'i, the kioea (brown-streaked, in middle) and an o'o species (lower left), looked so much like nectar specialists from the western Pacific (two species on right) that taxonomists put them all in the same honeyeater family, the Meliphagidae. All the Hawaiian birds are unfortunately extinct, but DNA evidence shows that their resemblance resulted from convergent evolution, because the Hawaiian birds were actually much…
grrlscientist | December 9, 2008tags: evolution, biogeography, ornithology, birds, avian
Kolo Sunset.
Photo credit: Christopher E. Filardi, American Museum of Natural History
(Click on image for a larger picture).
Two of my ornithologist colleagues, Chris Filardi and Rob Moyle, published a paper in the top-tier research journal, Nature. This paper is especially exciting because it shows that oceanic islands are not necessarily the evolutionary "dead ends" that they have traditionally been portrayed to be. In fact, Chris and Rob's data show that a group of birds have actually accomplished what scientists had never…
grrlscientist | December 5, 2008tags: evolution, Phylogeny, ornithology, chemical defense, Batrachotoxin, poisonous birds, Pitohui, Ifrita, Pachycephalidae, New Guinea
The Hooded Pitohui, Pitohui dichrous,
endemic to New Guinea, is very unusual
because it has poisonous plumage and skin.
Image: John Dumbacher.
I have been in love with New Guinea since I first read about it as a kid. Everything about this tropical island is exotic and fascinating to me, from the large numbers of endemic bird and plant species to the tremendous number of spoken languages -- more than anywhere else on the planet. So I was immediately…
grrlscientist | December 4, 2008tags: peer-reviewed paper, psychology, gift wrapping, wrapping paper, behavior, holidays, holidaze
Besides bright lights, my favorite thing about the holidays is wrapping gifts. I love covering a boxed gift with colored papers (or even with plain brown paper bags), I get tremendous satisfaction from folding the paper so it makes precise corners and then I especially enjoy decorating the wrapped gift with bows, ribbons and toy flowers and birds, christmas ornaments or other decorations. I also enjoy figuring out how to wrap unusually shaped objects. However, my most favorite thing to do is…
grrlscientist | November 12, 2008tags: ecology, exotic species, introduced species, non-native species, invasive species, monk parakeets, quaker parrots, Myiopsitta monachus, Michael A Russello, Michael L Avery, Timothy F Wright
Monk (Quaker) parakeets, Myiopsitta monachus, with nest.
Image: Arthur Grosset [larger view].
Invasive species are everywhere: from plants such as Scotch (English) broom, Cytisus scoparius, whose yellow flowers bloom prolifically along roadways of North America, Australia and New Zealand to mammals such as human beings, Homo sapiens, which are the ultimate invasive species because we have…
grrlscientist | October 28, 2008tags: blue tit, Cyanistes caeruleus, extrapair fertilization, genetic benefit hypothesis, genetic similarity, plumage color, birdsong, ornithology, behavioral ecology
Blue tit, Cyanistes caeruleus.
Image: Paul Hillion, 26 April 2008.
Even though most bird species form social bonds with their mates, they are not always faithful partners to each other. It's easy to figure out why male birds engage in extrapair copulations: this increases the total number of their offspring -- and this increases their reproductive fitness. But since female birds are physically capable of producing only…