eCite Digital Repository

Southern Right Whale (Eubalaena australis) Reproductive Success is Influenced by Krill (Euphausia superba) Density and Climate

Citation

Seyboth, E and Groch, KR and Dalla Rosa, L and Reid, K and Flores, PAC and Secchi, ER, Southern Right Whale (Eubalaena australis) Reproductive Success is Influenced by Krill (Euphausia superba) Density and Climate, Scientific Reports, 6 Article 28205. ISSN 2045-2322 (2016) [Refereed Article]


Preview
PDF
638Kb
  

Copyright Statement

Copyright 2016 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/srep28205

Abstract

he reproductive success of southern right whale (Eubalaena australis) depends on body condition and, therefore, on foraging success. This, in turn, might be affected by climatically driven change in the abundance of the species main prey, krill (Euphausia superba), on the feeding grounds. Annual data on southern right whale number of calves were obtained from aerial surveys carried out between 1997 and 2013 in southern Brazil, where the species concentrate during their breeding season. The number of calves recorded each year varied from 7 to 43 ((x) over bar = 21.11 +/- 11.88). Using cross-correlation analysis we examined the response of the species to climate anomalies and krill densities. Significant correlations were found with krill densities (r = 0.69, p = 0.002, lag 0 years), Oceanic Nino Index (r = -0.65, p = 0.03, lag 6 years), Antarctic Oscillation (r = 0.76, p = 0.01, lag 7 years) and Antarctic sea ice area (r = -0.68, p = 0.002, lag 0 years). Our results suggest that global climate indices influence southern right whale breeding success in southern Brazil by determining variation in food (krill) availability for the species. Therefore, increased frequency of years with reduced krill abundance, due to global warming, is likely to reduce the current rate of recovery of southern right whales from historical overexploitation.

Item Details

Item Type:Refereed Article
Keywords:seals, fin whales, population-dynamics, prey
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Ecosystem Function
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Reid, K (Dr Keith Reid)
ID Code:119590
Year Published:2016
Web of Science® Times Cited:1
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-08-02
Last Modified:2017-09-18
Downloads:6 View Download Statistics

Repository Staff Only: item control page