"The southwest coast of #Australia hosts one of the world's few southern right #whale populations ... We knew their numbers were increasing since the 1970s but, given recent signs of slowing birth rates in ... populations elsewhere, it was important to re-assess how their recovery was progressing in Australia," Grundlehner said.
"We analyzed 49 years of aerial survey data from 1976 to 2024 ... across more than 2,000 kilometers of coastline, available from ... monitoring efforts initiated by the late John Bannister. And we were very concerned to find not only slowed growth in births ... but an actual halt and what looks like the onset of a decline.
"We found that annual births began to stagnate around 2016 and observed declining trends in the number of animals visiting the coast. ... the number of other individuals that visit has dropped by 66% between 2011 and 2024," she said.