Status of Global Migrations 2018: Everything Unwinding


Alex Wierbinski's picture

By Alex Wierbinski - Posted on 29 March 2018

 

Eco Crash News
Status of Global Migrations

Everything Unwinding

Animal migrations,
University of California - Santa Barbara, March 26, 2018.

"...set out to estimate the vulnerability and extinction risk of migratory birds, mammals and fishes from different regions and ecosystems around the world."

“...we found that the vulnerability of migratory animals varied depending on the regional, environmental, behavioral and taxonomic context of the species.”

"...examined more than 6,000 migratory species by taxonomic group (birds, mammals and fishes) and by environmental system (terrestrial, marine or freshwater)..."

 

BIRDS
"... while migratory birds are relatively abundant, their numbers are decreasing disproportionately to nonmigratory birds."

 

MAMMALS
"...migratory mammals, whose population size is increasing compared to their nonmigratory counterparts. Nonetheless, IUCN lists them as “more endangered.”

“The relative increase of migratory mammals compared to nonmigratory mammals underscores the success of previous conservation efforts,” Hardesty-Moore said. “Still, migratory mammals have an overall high extinction risk because they face so many barriers — roads and development, hunting and poaching — so more work still needs to be done.” "

"...found that migratory freshwater fishes are at greater risk than their marine brethren, which makes sense considering that the avenues of travel available to freshwater species are much more restricted. Dams are a major problem for some of these migrators."

 

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