Prey species found within Hooker Sea Lion scats

This dataset is a collection of presence-absence and %occurrence data of prey species found within scats of Hooker Sea Lions. The data are presented in an excel spreadsheet.

Samples were collected from 54 scats.

From the abstract of the referenced paper:

Scats were collected from itinerant male Hooker's sea lions, Phocarctos hookeri, at Macquarie Island and the un-eroded faunal remains used to assess the diet. Un-eroded sagittal otoliths were used to identify teleost fish and to calculate fish size. Prey items included 14 taxa of teleost fish, cephalopods, gastropods, crustaceans and fur seals. Fish constituted the primary component of the diet. Prey species previously uncommon in the diet of seals and penguins around Macquarie Island were commonly eaten by Hooker's sea lions. The sub-Antarctic horse fish (Zanclorhynchus spinifer) and the Patagonian tooth fish (Dissostichus eleginoides) were the two most abundant species and occurred in 62.5% and 41.7% of all scats respectively. There were no age specific and individual differences in the diet of sea lions. Seasonal variances in diet were absent. Small plastic fragments (diameter ~ 1mm) were only found in association with Electrona subaspera otoliths. Some overlap was seen between the diet of itinerant male Hooker's sea lions and the commercial fisheries that currently occur around Macquarie Island.

This work was completed as part of ASAC project 2265 (ASAC_2265).

本数据集为胡克海狮（Hooker Sea Lions）粪便中检出的猎物物种存在-缺失数据及出现率（%occurrence）集合，以Excel电子表格形式存储。

共采集54份粪便样本。

引自相关研究论文的摘要如下：研究团队从麦夸里岛（Macquarie Island）的漫游雄性胡克海狮（Phocarctos hookeri）处收集粪便样本，通过未受侵蚀的动物残骸分析其食性。借助未受侵蚀的矢状耳石（sagittal otoliths）鉴定硬骨鱼类（teleost fish）并估算其体型。本次检出的猎物类群涵盖14类硬骨鱼类、头足类（cephalopods）、腹足类（gastropods）、甲壳类（crustaceans）以及海狗。鱼类为该海狮的核心食物组分。此前在麦夸里岛周边海域的海豹与企鹅食性中较为罕见的猎物物种，却在胡克海狮的食性中占有相当比例。亚南极马面鱼（Zanclorhynchus spinifer）与巴塔哥尼亚牙鱼（Dissostichus eleginoides）为最优势的两个猎物类群，分别在62.5%与41.7%的粪便样本中被检出。该海狮的食性不存在年龄特异性与个体差异，亦无季节波动。仅在与壮体灯笼鱼（Electrona subaspera）耳石伴生的样本中，检出直径约1mm的微型塑料碎片。漫游雄性胡克海狮的食性与当前麦夸里岛周边开展的商业捕捞活动存在一定重叠。

本研究为ASAC项目2265（ASAC_2265）的研究成果。