Spatial-temporal patterns in intra-annual gray whale foraging

Characterizing interactions between predators and prey in Clayquot Sound, British Columbia, Canada

Trisalyn Nelson, D. A. Duffus, C. Robertson, L. J. Feyrer

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In Clayquot Sound, British Columbia, gray whales (Eschrichtius robustus) forage primarily on mysids (Family Mysideae) and also on crab larvae (Family Porcellanidae) that are constrained to specific habitat, which relate to bathymetric depths. In this paper we characterize the interactions of gray whales and their prey by analyzing fine scale spatial-temporal patterns in foraging gray whale distribution within a season. Kernel density estimators are applied to two seasons (1998 and 2002) of high-resolution data on foraging by gray whales. By partitioning data from each foraging season into several time periods (12 in 1998 and 11 in 2002), using a temporal autocorrelation function, and generating kernel density estimated surfaces for each time period, it is possible to identify discrete areas of increasing and declining foraging effort. Our results indicate that gray whales forage on mysids throughout a season and opportunistically forage on crab larvae. The episodic crab larvae feeding may reduce, but not eliminate, pressure to mysid populations enabling mysids to reassemble swarms and continue to support gray whale foraging in the latter part of the season. Results suggest that when managing marine environments, gray whale populations require multiple and connected habitats for summer foraging.

Original languageEnglish (US)
Pages (from-to)356-370
Number of pages15
JournalMarine Mammal Science
Volume24
Issue number2
DOIs
StatePublished - Apr 2008
Externally publishedYes

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whale
British Columbia
Canada
foraging
predator
predators
forage
crab
crabs
larva
larvae
habitat
Eschrichtius robustus
swarms
autocorrelation
habitats
seeds
marine environment
partitioning
family

Keywords

  • Change detection
  • Eschrichtius robustus
  • Gray whale
  • Kernel density estimation
  • Predator-prey interactions
  • Spatial pattern analysis
  • Spatial-temporal patterns
  • Whale foraging

ASJC Scopus subject areas

  • Aquatic Science
  • Animal Science and Zoology

Cite this

Spatial-temporal patterns in intra-annual gray whale foraging : Characterizing interactions between predators and prey in Clayquot Sound, British Columbia, Canada. / Nelson, Trisalyn; Duffus, D. A.; Robertson, C.; Feyrer, L. J.

In: Marine Mammal Science, Vol. 24, No. 2, 04.2008, p. 356-370.

Research output: Contribution to journalArticle

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