Climate change and habitat conversion combine to homogenize nature

Climate change and habitat conversion combine to homogenize nature
The long-tailed manakin in Costa Rica prefers wet forest habitat. It is vulnerable to the combined impacts of climate change and habitat conversion. Credit: Daniel Karp/UC Davis

Climate change and habitat conversion to agriculture are working together to homogenize nature, indicates a study in the journal Global Change Biology led by the University of California, Davis.

In other words, the more things change, the more they are the same.

While the individual impacts of and conversion on wildlife are well-recognized, little is known about how species respond to both stressors at once.

In northwest Costa Rica, the study's authors surveyed birds and plants at 120 sites that included rainforests, and farmland to determine how habitat conversion and climate-change-induced droughts affect tropical wildlife. They found that different bird species thrive in drier versus wetter areas of forests. In farmlands however, birds associated with dry sites were found everywhere, even in the wettest sites.

"Across Central and South America, we are seeing large areas being converted from native to agriculture, and droughts are becoming more frequent," said lead author Daniel Karp, an assistant professor in the UC Davis Department of Wildlife, Fish and Conservation Biology. "Both of these global pressures are favoring the same species and threatening the same species This means we may be losing biodiversity faster than we previously thought when we were studying climate change and habitat conversion individually."

Climate change and habitat conversion combine to homogenize nature
Orange-chinned parakeets eat mangoes from a farmer's tree in Costa Rica. It can thrive in drier habitats. Credit: Daniel Karp/UC Davis

Karp said the most vulnerable birds at the study sites were those in the wet forests, which include tropical birds like tanagers, manakins, and woodcreepers. He noted that in the agricultural sites—such as blackbirds, doves, and sparrows—were more similar to those found in the dry forest, where there is less of a tree canopy and more grass cover.

Focus on conservation

"Now that we know this, we know what to focus on from a conservation perspective," Karp said.

To help retain high levels of biodiversity, land managers could target for protection areas of wetter forests that expected to stay wet in the future. Conservation dollars could also focus on wet-forest that are particularly sensitive to and climate change. Another option is to incentivize private landowners in wet regions to create or maintain patches of forests near or within their farms to better balance food production and biodiversity.

Climate change and habitat conversion combine to homogenize nature
This laughing falcon in Costa Rica can persist in farmlands and thrives in drier habitats. Credit: Daniel Karp/UC Davis

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Journal information: Global Change Biology

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Citation: Climate change and habitat conversion combine to homogenize nature (2017, August 18) retrieved 31 May 2020 from https://phys.org/news/2017-08-climate-habitat-conversion-combine-homogenize.html
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