Same species, different prerequisites: investigating body condition and foraging success in young reef sharks between an atoll and an island system

Abstract : Acquiring and storing energy is vital to sharks of all age-classes. Viviparous shark embryos receive endogenous maternal energy reserves to sustain the first weeks after birth. Then, in order to maintain body condition, sharks must start foraging. Our goal was to understand whether maternal energy investments vary between blacktip reef sharks (Carcharhinus melanopterus) from two populations and to what extent body condition and the initiation of foraging might be affected by presumably variable maternal investments. A total of 546 young sharks were captured at St. Joseph atoll (Seychelles) and Moorea (French Polynesia) between 2014 and 2018, and indices of body condition and percentage of stomachs containing prey were measured. Maternal investment was found to be site-specific, with significantly larger, heavier, and better conditioned individuals in Moorea. Despite these advantages, as time progressed, Moorea sharks exhibited significant decreases in body condition and were slower to initiate foraging. We suggest that the young sharks’ foraging success is independent of the quality of maternal energy resources, and that other factors, such as prey availability, prey quality, and/or anthropogenic stressors are likely responsible for the observed differences across sites. Insights into intraspecific variations in early life-stages may further support site-specific management strategies for young sharks from nearshore habitats.
Document type :
Journal articles
Complete list of metadatas

Cited literature [68 references]  Display  Hide  Download

https://hal-univ-perp.archives-ouvertes.fr/hal-02311989
Contributor : Sonja Böttger <>
Submitted on : Friday, October 11, 2019 - 10:36:42 AM
Last modification on : Wednesday, November 20, 2019 - 7:10:58 AM

File

s41598-019-49761-2.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Ornella Weideli, Ian Bouyoucos, Yannis Papastamatiou, Gauthier Mescam, Jodie Rummer, et al.. Same species, different prerequisites: investigating body condition and foraging success in young reef sharks between an atoll and an island system. Scientific Reports, Nature Publishing Group, 2019, 9 (1), ⟨10.1038/s41598-019-49761-2⟩. ⟨hal-02311989⟩

Share

Metrics

Record views

70

Files downloads

63