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Essential waters: Young bull sharks in Fiji's largest riverine system

Glaus, Kerstin and Brunnschweiler, Juerg M. and Piovano, Susanna and Mescam, Gauthier and Genter, Franziska and Fluekiger, Pascal and Rico, Ciro (2019) Essential waters: Young bull sharks in Fiji's largest riverine system. Ecology and Evolution, 9 (13). pp. 7574-7585. ISSN 2045-7758

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    Abstract

    Coastal and estuarine systems provide critical shark habitats due to their relatively high productivity and shallow, protected waters. The young (neonates, young-of-the-year, and juveniles) of many coastal shark species occupy a diverse range of habitats and areas where they experience environmental variability, including acute and seasonal shifts in local salinities and temperatures. Although the location and functioning of essential shark habitats has been a focus in recent shark research, there is a paucity of data from the South Pacific. In this study, we document the temporal and spatial distribution, age class composition, and environmental parameters of young bull sharks (Carcharhinus leucas) in the Rewa, Sigatoka, and Navua Rivers, Fiji's three largest riverine systems. One hundred and seventy-two young bull sharks were captured in fisheries-independent surveys from January 2016 to April 2018. The vast majority of the captures were neonates. Seasonality in patterns of occurrence of neonate individuals suggests a defined parturition period during summer. Environmental parameters between the Rewa and the Sigatoka River differed significantly, as did the recorded young bull sharks abundance. According to the surveys, young bull sharks occur in all three rivers with the Rewa River likely representing essential habitat for newly born bull sharks. These results enhance the understanding of bull shark ecology in Fiji and provide a scientific basis for the implementation of local conservation strategies that contribute to the protection of critical habitats.

    Item Type: Journal Article
    Uncontrolled Keywords: Carcharhinus leucas, essential fish habitats, neonates, salinity, South Pacific
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Q Science > Q Science (General)
    Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Marine Studies
    Depositing User: Fulori Nainoca
    Date Deposited: 23 Jul 2019 13:58
    Last Modified: 23 Jul 2019 13:58
    URI: http://repository.usp.ac.fj/id/eprint/11683
    UNSPECIFIED

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