North Atlantic right whale experts on both sides of the border express cautious optimism following an increase in the number of new calves born this year. A total of twenty-three calves were welcomed during the calving season from November to April off the southeastern U.S., marking the highest count since 2009.
Amy Warren, a scientific program officer at the New England Aquarium’s Anderson Cabot Center for Ocean Life, noted the significance of the twenty-three calves as a hopeful sign. However, she emphasized the importance of their survival into adulthood to contribute to the endangered population of North Atlantic right whales, which currently stands at only 380 individuals based on the latest official estimate from 2024.
In the past, the average annual calving rate was around 20 calves two to three decades ago. However, over the last decade, this number dwindled to approximately 10 to 15 calves, with no known calves born in 2018. Warren highlighted the necessity for sustained positive trends to offset the years of low calving numbers.
The health of the mothers plays a crucial role in calving success, with factors such as food availability impacting their ability to care for calves. North Atlantic right whales are reliant on specific plankton species for sustenance, but climate change-induced shifts have forced these food sources further north. The lack of suitable feeding grounds near their calving areas off Florida and Georgia poses challenges as the mothers must rely on stored fat reserves during the calving and nursing periods.
Various human-induced stressors, including ocean noise, vessel traffic, and fishing gear entanglements, also pose threats to the health of North Atlantic right whales. Recent conservation efforts in Canadian and U.S. waters, such as fishery closures and speed restrictions for marine vessels, aim to mitigate these risks and protect the whales.
Notably, this year saw not only an increase in calf numbers but also a reduction in the time gap between successive births for some mothers, indicating positive reproductive health. Researchers view this trend positively, with hopes that healthier mothers can contribute to a faster population growth rate.
While the 23 new calves bring optimism, Warren stressed that the overall population remains critically low. To reverse the decline and ensure species recovery, a sustained increase in calving rates, ideally around 50 calves per year for several years, would be necessary. The whales have been observed moving into Canadian waters, with researchers eagerly anticipating further sightings to track the population’s progress.