Maternal body size and condition determine calf growth rates in southern right whales

The cost of reproduction is a key parameter determining a species' life history strategy. Despite exhibiting some of the fastest offspring growth rates among mammals, the cost of reproduction in baleen whales is largely unknown since standard field metabolic techniques cannot be applied. We qua...

Full description

Bibliographic Details
Published in:Marine Ecology Progress Series
Main Authors: Christiansen, Fredrik, Vivier, Fabien, Charlton, Claire, Ward, Rhianne, Amerson, Alicia, Burnell, Stephen, Bejder, Lars
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
Baleen whales
Bioenergetics
Body condition
Energy transfer
Lactation
Offspring growth
Photogrammetry
Unmanned aerial vehicles
EUBALAENA-AUSTRALIS
REPRODUCTIVE SUCCESS
ENERGY-TRANSFER
ELEPHANT SEALS
ATLANTIC FIN
FETAL-GROWTH
ENERGETICS
MAMMALS
COSTS
baleen whales
Elephant Seals
Online Access:https://pure.au.dk/portal/en/publications/4264120d-2d44-4c1a-953f-0180db3462e8
https://doi.org/10.3354/meps12522
http://www.scopus.com/inward/record.url?scp=85044739198&partnerID=8YFLogxK
Description
Summary:The cost of reproduction is a key parameter determining a species' life history strategy. Despite exhibiting some of the fastest offspring growth rates among mammals, the cost of reproduction in baleen whales is largely unknown since standard field metabolic techniques cannot be applied. We quantified the cost of reproduction for southern right whales Eubalaena australis over a 3 mo breeding season. We did this by determining the relationship between calf growth rate and maternal rate of loss in energy reserves, using repeated measurements of body volume obtained from unmanned aerial vehicle photogrammetry. We recorded 1118 body volume estimates from 40 female and calf pairs over 40 to 89 d. Calves grew at a rate of 3.2 cm d(-1) (SD = 0.45) in body length and 0.081 m(3) d(-1) (SD = 0.011) in body volume, while females decreased in volume at a rate of 0.126 m(3) d(-1) (SD = 0.036). The average volume conversion efficiency from female to calf was 68% (SD = 16.91). Calf growth rate was positively related to the rate of loss in maternal body volume, suggesting that maternal volume loss is proportional to the energy investment into her calf. Maternal in vestment was determined by her body size and condition, with longer and more rotund females investing more volume into their calves compared to shorter and leaner females. Lactating females lost on average 25% of their initial body volume over the 3 mo breeding season. This study demonstrates the considerable energetic cost that females face during the lactation period, and highlights the importance of sufficient maternal energy reserves for reproduction in this capital breeding species.

Similar Items