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Fisheries-independent surveys identify critical habitats for young scalloped hammerhead sharks (Sphyrna lewini) in the Rewa Delta Fiji

机译:与渔业无关的调查确定了斐济雷瓦三角洲的扇贝双hammer鲨(Sphyrna lewini)的重要栖息地

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摘要

Sharp declines in numerous shark populations around the world have generated considerable interest in better understanding and characterising their biology, ecology and critical habitats. The scalloped hammerhead shark (SHS, Sphyrna lewini) is subject to a multitude of natural and anthropogenic threats that are often exacerbated within the coastal embayments and estuaries used during SHS early life stages. In this study, we describe the temporal and spatial distribution, age class composition, and reproductive biology of SHS in the Rewa Delta (RD), Fiji. A total of 1054 SHS (including 796 tagged individuals; 101 of which were recaptured) were captured from September 2014 to March 2016 in the RD. A majority of the captures in this area were neonates and young-of-the-year (YOY) (99.8%). Significant seasonality in patterns of occurrence of both neonates and YOY individuals suggests a defined parturition period during the austral summer. Between the seven sampling sites in the RD we also found significant differences in SHS neonate catch per unit of effort, and average total length of individuals. According to the data, the RD is likely to represent an important nursery area for SHS up to one year of age.
机译:全世界众多鲨鱼种群的急剧减少引起了人们对更好地了解和表征其生物学,生态学和重要栖息地的浓厚兴趣。扇形双hammer鲨(SHS,Sphyrna lewini)遭受多种自然和人为威胁,在SHS早期生命阶段所使用的沿海浮标和河口中通常会加剧这种威胁。在这项研究中,我们描述了斐济雷瓦三角洲(RD)的SHS的时空分布,年龄类别组成和生殖生物学。 2014年9月至2016年3月,在RD中共捕获了1054个SHS(包括796个带有标签的个人),其中101个被重新捕获。该地区的大部分捕获物是新生儿和年少(YOY)(99.8%)。新生儿和YOY个体发生模式的显着季节性表明在南方夏季定义了分娩期。在RD中的七个采样点之间,我们还发现每单位工作量的SHS新生儿捕获量和个体的平均总长度存在显着差异。根据数据,RD可能代表了不超过一岁的SHS的重要苗圃地区。

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