The usefulness of pellets for assessing the diet of adult Shags Phalacrocorax aristotelis
The usefulness of pellets for assessing the diet of adult Shags Phalacrocorax aristotelis
复制标题
颗粒在评估成年 Shags Phalacrocorax aristotelis 饮食方面的有用性
DOI：
10.1080/00063659009477030
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发表时间：
1990
期刊：
影响因子：
0.7
通讯作者：
J. Graves
中科院分区：
文献类型：
--
作者：
I. Johnstone;M. Harris;S. Wanless;J. Graves
每天，鸬鹚被喂食已知数量的沙鲛、鲱鱼、鲱鱼或鳕鱼，并检查鸬鹚反刍的颗粒内容物。通常情况下，每只鸟每天都会产生一个颗粒，其中含有过去 24 小时内吃过的鱼的耳石。回收的耳石比例每天以及根据鱼类种类都有很大差异。鳕鱼耳石的回收率最高，鲱鱼和鲱鱼的耳石回收率较低，砂磨耳石的回收率中等。对颗粒中耳石的测量对所吃鱼的大小给出了非常误导性的估计。在将颗粒用于海鸟的一般饮食研究之前，需要回答一些基本问题。
Each day Shags were fed known numbers of either Sanded, Sprat, Herring or Cod and the contents of the pellets which the birds regurgitated were examined. Normally, each bird produced a single pellet each day which contained otoliths from the fish eaten during the previous 24 hr. The proportion of recovered otoliths varied greatly both from day to day and according to the species of fish. Otoliths from Cod had the highest recovery rate, those of Herring and Sprat were recovered less often and the recovery rate of Sanded otoliths was intermediate. Measurements of otoliths from the pellets gave a very misleading estimate of the size of fish eaten. Fundamental questions need to be answered before pellets can be used in general dietary studies of seabirds.