Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California
Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California
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加利福尼亚州蒙特利湾中层有孔虫（Hastigerinella digitalata）的季节性和深度分布
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
B. Robison
中科院分区：
文献类型：
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作者：
P. Hull;Karen J Osborn;Karen J Osborn;R. Norris;B. Robison
我们利用 12 年的视频调查和现场采集的标本，调查了加利福尼亚州蒙特利湾中层有孔虫的栖息地深度和种群动态。蒙特利峡谷上空的水柱持续支持着两种不同的中层有孔虫物种：Hastigerinella digitalata 和一种以前未知的物种 Hastigerina sp.，其中 H. digitalata 在中层深度的浮游有孔虫组合中占主导地位。 H.digitata 种群生活在狭窄的深度范围内，位于区域氧气最低区核心之上，深度为 280-358 m，O2 浓度为 1-1.3 mL L−1。我们的观察为理解指状浮游有孔虫化石提供了现代校准。我们在指状动物的刺上观察到大量处于不同摄食阶段的桡足类动物，并且在刺状网络上明显缺乏附着的碎屑，这为指状动物是专性食肉动物的假设提供了支持。尽管在季节性和年际时间尺度上，指状动物通常在较冷的水域中更为丰富，但指状动物种群并未表现出强烈的两相季节性，而这种季节性季节性是生活在蒙特利峡谷上方的许多中层物种种群动态的特征。
We investigated the habitat depth and population dynamics of mesopelagic foraminifera in Monterey Bay, California, using 12 yr of video surveys and specimens from live collections. The water column over Monterey Canyon continuously supports two distinct species of mesopelagic foraminifera, Hastigerinella digitata and a previously unknown species referred to as Hastigerina sp., with H. digitata dominating the planktonic foraminiferal assemblage at mesopelagic depths. H. digitata populations live within a narrow depth horizon that lies above the core of the regional oxygen minimum zone at a depth of 280–358 m and O2 concentrations of 1–1.3 mL L−1. Our observations provide a modern calibration for understanding fossil digitate planktonic foraminifera. We observed numerous copepods in various stages of ingestion on the spines of H. digitata and a conspicuous lack of detritus attached to the spine network, providing support for the hypothesis that H. digitata is an obligate carnivore. H. digitata populations did not show the strong two‐phase seasonality that characterizes the population dynamics of many mesopelagic species that live above the Monterey Canyon, although H. digitata was generally more abundant in cooler waters on seasonal and interannual timescales.
影响因子：
1.9
作者：
Darling, Kate F.;Wade, Christopher M.
通讯作者：
Wade, Christopher M.