Intraspecific variation in diel patterns of rocky reef use suggests temporal partitioning in Port Jackson sharks

Nathan Charles Bass*, Joanna Day, Tristan L. Guttridge, Nathan A. Knott, Culum Brown

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)
    22 Downloads (Pure)

    Abstract

    Limited information exists about the temporal residency patterns of marine predators, especially at the individual level. Temporal partitioning of resources can reduce intra-specific competition, but this has seldom been examined in predators in marine ecosystems. Here, we used 8 years of acoustic telemetry data from 27 receivers deployed in a large coastal embayment to examine the temporal residency of 51 Port Jackson sharks (Heterodontus portusjacksoni), during their breeding season. We found that the residency lengths of male and female Port Jackson sharks on breeding reefs differed throughout the breeding season, with males showing longer residency at the start of the season and females showing longer residency at the end of the season. Port Jackson sharks also showed a 24-h or diel periodicity in their detection patterns. Although the majority of individuals were nocturnal, a small proportion of sharks was detected more frequently during the day, possibly to reduce competition for resources. Surprisingly, there was no difference in the sex ratio nor the size of diurnal and nocturnal individuals. This study provides long-term insight into the temporal residency patterns of mesopredatory sharks at a breeding site and, more broadly, our results highlight the importance of studying temporal variation at the individual level in movement ecology studies.

    Original languageEnglish
    Pages (from-to)1445-1456
    Number of pages12
    JournalMarine and Freshwater Research
    Volume72
    Issue number10
    Early online date13 May 2021
    DOIs
    Publication statusPublished - 2021

    Bibliographical note

    Copyright the Publisher 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • elasmobranchs
    • marine
    • ecology

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