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首页> 外文期刊>The Wilson Bulletin >GRIT-SITE SELECTION OF BLACK BRANT: PARTICLE SIZE OR CALCIUM CONTENT?
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GRIT-SITE SELECTION OF BLACK BRANT: PARTICLE SIZE OR CALCIUM CONTENT?

机译：黑布兰的粗砂选择：颗粒大小或钙含量？

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摘要

We examined selection of grit-ingestion sites by Black Brant (Eranta hernicla nigricans) on South Humboldt Bay, California in relation to particle size and calcium content. We hypothesized that Brant site selection was dependent primarily upon calcium content and secondarily upon distribution of substrate particle size. We (1) mapped grit-ingestion sites, (2) ranked their importance by Brant abundance and individual movement probabilities between sites, (3) characterized Brant gizzard grit and compared it with grit available at ingestion sites, and (4) compared calcium content and particle-size distribution between ingestion sites and unused sites, and between primary and secondary ingestion sites. Brant repeatedly congregated at specific, discrete sites during the 2 years of observation. The distribution of gizzard-grit particle size was right-skewed toward larger particles (>0.5 mm) relative to the proportional availability of particle sizes in the substrate. We found no significant differences in calcium content or particle size between sites where grit was ingested and unused sites. Within used sites, the calcium content of substrates at the primary ingestion site was significantly higher than at the secondary ingestion sites, as ranked by Brant abundance and between-site movement probabilities. Our findings from the field corroborate previous laboratory results, and confirm that calcium is a significant ecological factor for this species.
机译：我们检查了黑勃兰特（Eranta hernicla nigricans）在加利福尼亚州南洪堡湾的沙粒摄取部位相对于粒度和钙含量的选择。我们假设布兰特位点的选择主要取决于钙含量，其次取决于底物粒度的分布。我们（1）绘制了砂砾摄取部位，（2）通过Brant丰度和部位之间的个体移动概率对它们的重要性进行了排名，（3）表征了Brant izz砂砾，并将其与摄入部位可用的砂砾进行了比较，（4）比较了钙含量摄入部位和未使用部位之间以及主要和次要摄入部位之间的粒度分布。在观察的2年中，布兰特反复聚集在特定的地点。相对于基质中颗粒尺寸的比例可用性，izz砂粒度的分布向较大颗粒（> 0.5 mm）右偏。我们发现摄取砂砾的部位与未使用部位之间的钙含量或粒度没有显着差异。在使用部位内，根据布兰特丰度和部位间移动概率排名，主要摄入部位底物的钙含量明显高于次要摄入部位。我们在野外的发现证实了以前的实验室结果，并证实钙是该物种的重要生态因子。

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