Supplementary material from "Decreasing body size is associated with reduced calving probability in critically endangered North Atlantic right whales"
Version 2 2024-02-27, 07:09
Version 1 2024-02-15, 07:44
Posted on 2024-02-27 - 07:09
Body size is key to many life-history processes, including reproduction. Across species, climate change and other stressors have caused reductions in the body size to which animals can grow, called asymptotic size, with consequences for demography. A reduction in mean asymptotic length was documented for critically endangered North Atlantic right whales, in parallel with declines in health and vital rates resulting from human activities and environmental changes. Here, we tested whether smaller body size was associated with lower reproductive output, using a state-space model for individual health, survival and reproduction that quantifies the mechanistic links between these processes. Body size (as represented by the cube of length) was strongly associated with a female's calving probability at each reproductive opportunity. This relationship explained 62% of the variation in calving among reproductive females, along with their decreasing health (20%). The effects of decreasing mean body size on reproductive performance are another concerning indication of the worsening prospects for this species and many others affected by environmental change, requiring a focus of conservation and management interventions on improving conditions that affect reproduction as well as reducing mortality.
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Pirotta, Enrico; Tyack, Peter L.; Durban, John W.; Fearnbach, Holly; Hamilton, Philip K.; Harris, Catriona M.; et al. (2024). Supplementary material from "Decreasing body size is associated with reduced calving probability in critically endangered North Atlantic right whales". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.7075603.v2
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AUTHORS (15)
EP
Enrico Pirotta
PT
Peter L. Tyack
JD
John W. Durban
HF
Holly Fearnbach
PH
Philip K. Hamilton
CH
Catriona M. Harris
AK
Amy R. Knowlton
SK
Scott D. Kraus
CM
Carolyn A. Miller
MM
Michael J. Moore
HP
Heather M. Pettis
TP
Theoni Photopoulou
RR
Rosalind M. Rolland
RS
Rob S. Schick
LT
Len Thomas