Journal
MARINE MAMMAL SCIENCE
Volume 38, Issue 2, Pages 486-499Publisher
WILEY
DOI: 10.1111/mms.12871
Keywords
capital breeder; Eubalaena australis; maternal investment; physiology; southern right whale; stable isotope
Categories
Funding
- Australian Antarctic Division
- Australian Marine Mammal Centre
- Blue Planet Marine NZ Ltd
- Brazilian National Research Council [144064/98-7]
- Brian Skerry Photography
- EU Horizons 2020
- Holsworth Wildlife Research Endowment
- Marine Conservation Action Fund
- National Geographic Society
- New Zealand Department of Conservation
- New Zealand Ministry of Foreign Affairs
- Royal Society of New Zealand
- South Pacific Whale Research Consortium
- Winifred Violet Scott Estate Research Grant Fund
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Southern right whales from New Zealand demonstrate negative Delta C-13(calf-cow) offset, indicating calves are utilizing C-13-depleted lipid carbon in milk for rapid growth, while those from Argentina during a mass die-off event show significantly positive Delta C-13(calf-cow) offset, possibly due to consuming milk with low lipid content. Patterns in Delta N-15(calf-cow) were more difficult to interpret and highlight the complexity in nitrogen transfer between mother and offspring, suggesting a need for further research in this area.
Southern right whales (SRW) are capital breeders that use stored energy reserves to sustain themselves and their calves on nursery areas. With successful calving events declining in some SRW populations, it has been hypothesized that nutritional stress in adult females causes reproductive failure or death of calves shortly after birth. Here we compared offsets in carbon and nitrogen isotope values of mothers and their offspring (Delta C-13(calf-cow) and Delta N-15(calf-cow)) among three SRW populations. SRW from Aotearoa New Zealand, with high population growth rates and body conditions scores, have negative Delta C-13(calf-cow) suggesting calves are utilizing C-13-depleted lipid carbon in milk to fuel the synthesis of nonessential amino acids used to build new tissues and rapidly grow. In contrast, a significantly positive Delta C-13(calf-cow) offset previously reported for SRW from Argentina during a mass die-off event was hypothesized to be due to calves consuming milk with low lipid content. Patterns in Delta N-15(calf-cow) were more difficult to interpret and highlight the complexity in nitrogen transfer between mother and offspring. When combined with similar data collected from Brazil and during a low mortality year in Argentina, we hypothesize this approach provides a way to retrospectively compare nutritional condition of breeding adult female SRW across nursery areas.
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