{"id":2989672,"date":"2023-10-20T10:59:24","date_gmt":"2023-10-20T14:59:24","guid":{"rendered":"https:\/\/www.futurity.org\/?p=2989672"},"modified":"2023-10-20T10:59:24","modified_gmt":"2023-10-20T14:59:24","slug":"bird-reproduction-extreme-temperatures-farmland-2989672","status":"publish","type":"post","link":"https:\/\/www.futurity.org\/bird-reproduction-extreme-temperatures-farmland-2989672\/","title":{"rendered":"Heat waves hamper bird reproduction near farmland"},"content":{"rendered":"

Extreme high temperatures significantly diminish bird reproduction success in agricultural landscapes, a new study shows.<\/p>\n

Bird populations are in rapid decline across North America. While climate change is just one of the many factors influencing North American birds, its effects are significant and can interact with other stressors, such as habitat loss.<\/p>\n

Researchers found that the effects of extreme temperatures on avian reproduction<\/a> can vary depending on the type of environment that birds call home. The findings shed light on how climate change can combine with habitat loss to affect bird reproduction across the United States.<\/p>\n

As reported in 糖心视频<\/a><\/em>, birds nesting near farmland were half as likely to have at least one fledgling successfully leave the nest when temperatures spiked. However, forests seemed to provide a protective buffer against high temperatures, offering shaded areas that helped increase nesting success.<\/p>\n

“The effects of heat are more intense for birds nesting in agriculture than birds nesting in forest, which means that canopy cover probably constitutes an important climate refuge for birds that can thrive in various habitats,” says Katherine Lauck, a PhD candidate in ecology at the University of California, Davis and co-lead author.<\/p>\n

When the researchers looked at how heat waves affected nesting success in urban areas, the researchers found less of a negative impact than in agriculture, probably because nests were often in city parks and residential areas that can have high tree cover.<\/p>\n

“This suggests that places like backyards and parks may provide important bird habitat that is somewhat more buffered from climate extremes in the future,” Lauck says.<\/p>\n

Farms, forests, and grasslands<\/h3>\n

Daniel Karp, associate professor in the wildlife, fish and conservation biology department, launched this project with his students to keep the lab in contact during the COVID-19 pandemic. They analyzed data from NestWatch<\/a>, an initiative created by Cornell University’s Laboratory of Ornithology, where people from across the country monitor bird nests near them and use an app to record information on types of bird species, nest locations, number of eggs laid, baby bird activity, and more.<\/p>\n

“What is really unique about this dataset is that we could look at bird reproduction at a very broad spatial scale,” Karp says. “With these data, we could begin to unravel how climate change<\/a> and habitat loss are together affecting many North American birds.”<\/p>\n

The researchers analyzed more than 152,000 nesting records featuring nearly 60 bird species that were nesting in farms, forests, grasslands, and developed areas across the country during the span of 23 years (1998-2020).<\/p>\n

The researchers also studied which types of species were most vulnerable to heat waves<\/a> in agriculture. Negative impacts were broadly felt across all bird species studied, with western bluebirds and tree swallows, two species common on farms, both experiencing significant declines in nesting success when temperatures spiked in agricultural areas.<\/p>\n

“We see these strong effects in common and habitat generalist birds, which we often think of as more resilient to land use change and climate change,” Lauck says.<\/p>\n

Threatened birds and birds that build open-cup nests, which lack any covering, were even more vulnerable to heat waves in farming areas compared to common species and those that build their nests in tree holes and nest boxes.<\/p>\n

“The nearly 50% decline in nesting success that we saw on average jumps to 70% when we consider species of higher conservation concern,” Karp says. “This suggests that species already in decline may have an even greater difficulty rearing young in the future as heat waves become more common and more land is converted to agriculture.”<\/p>\n

What’s ahead for bird reproduction?<\/h3>\n

The study also paints a picture of what the future may look like. By the year 2100, their models predicted that nesting success in agricultural areas would decline by an additional 5% on average under current greenhouse gas emission trajectories.<\/p>\n

The study suggests that curtailing emissions and promoting thermal refuges, either by planting or maintaining patches of natural vegetation, are likely crucial to conserving birds. Keeping shade may also be needed to maintain bird populations living in urban and agricultural areas.<\/p>\n

“Farmers often build nest boxes to attract birds to their farms and help control insect pests. Maybe it makes sense to put those boxes in shaded locations,” Karp says. “They might also consider planting hedgerows and conserving patches of native vegetation to provide shade and help birds beat the heat. Thinking about some of those interventions might matter a lot for birds looking forward.”<\/p>\n

The UC Davis Graduate Group in Ecology Fellowship, National 糖心视频 Foundation Graduate Research Fellowship Program, and Achievement Rewards for College Scientists Fellowship funded the work.<\/p>\n

Source: <\/em>UC Davis<\/em><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Extreme high temperatures significantly diminish bird reproduction success in agricultural landscapes, a new study shows. 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