Habitat variety crucial for Jays as temperatures warm

14/04/2019

Researchers at the University of Southampton have shown that an even range of habitats – chiefly forests, fields and meadows – are needed in an area of around 200 m2 to 1 km2 in order for Jays to thrive.

The data, published recently in Methods in Ecology and Evolution, showed that the higher the temperature, the more important it it is for Jays to have a mix of different surroundings in a relatively small space, with an even spread of coniferous and broad-leaved forests also necessary.

The study shows how habitat management will become increasingly important as temperatures rise. Data from the BTO's Bird Atlas 2007-11 was studied by the researchers, who focused on Jay as it's a species known to frequent a variety of ecosystems. The Atlas was one of the most ambitious volunteer projects undertaken, with volunteer surveyors allocated squares of land around Britain in which they counted every bird during winter and in the breeding season.

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Warming temperatures may cause birds to shrink

January 24, 2018, American Ornithological Society

Biologists have known for a long time that animals living in colder climates tend to have larger bodies, supposedly as an adaptation to reduce heat loss. However, understanding how temperature affects animals has gained new importance thanks to climate change. A new study from The Auk: Ornithological Advances uses European House Sparrows, which have spread into a variety of climates in Australia and New Zealand since their introduction in the mid-19th century, to show that this trend in birds might actually be due to the effects of high temperatures during development—raising new alarms about how populations might be affected by global warming.

Macquarie University's Samuel Andrew and his colleagues captured and measured approximately 40 adult House Sparrows at each of 30 locations across Australia and New Zealand. They found that maximum temperatures during the summer, when the birds breed, were a better predictor of adult body size at each location than winter minimum temperatures. This adds support to the idea that excessive heat during development may affect birds' growth throughout their lives, raising concerns that increasing summer temperatures due to climate change could drive down the average adult body size, with potential effects on the birds' fitness.

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Warming temperatures are pushing two chickadee species -- and their hybrids -- northward

Date:

March 6, 2014

Source:

Villanova University

Summary:

The zone of overlap between two popular, closely related backyard birds is moving northward at a rate that matches warming winter temperatures, according to a study. In a narrow strip that runs across the eastern U.S., Carolina Chickadees from the south meet and interbreed with Black-capped Chickadees from the north. The new study finds that this hybrid zone has moved northward at a rate of 0.7 mile per year over the last decade. That’s fast enough that the researchers had to add an extra study site partway through their project in order to keep up.

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