Distribution and trophic ecology of chaetognaths in the western Mediterranean in relation to an inshore-offshore gradient
Distribution and trophic ecology of chaetognaths in the western Mediterranean in relation to an inshore-offshore gradient
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DOI：
10.1093/plankt/22.2.339
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发表时间：
2000-02-01
影响因子：
2.1
通讯作者：
Saiz, E
中科院分区：
文献类型：
--
作者：
Duró, A;Saiz, E
本研究探讨了在加泰罗尼亚海的分布格局和饲养生态的毛颚类中尺度功能沿着近岸-离岸梯度。这项研究是在一年中的两个不同时期进行的：1995年春末和1996年夏末。这两个时期的水文条件和中尺度过程不同，影响了不同种类毛颚类的分布格局，毛颚类的食物主要由桡足类组成，且种类间存在差异。猎物的大小并不总是强烈相关的毛颚大小和某些物种，有一个重叠的猎物大小谱。营养生态位宽度（比值尺度）随生长而变化。摄食率和捕食压力的毛颚类没有遵循一个明确的趋势，在该地区的中尺度功能，如存在的密度前。毛颚类对桡足类现存量的影响似乎极低（
This study examines the distribution patterns and feeding ecology of chaetognaths in the Catalan Sea in relation to mesoscale features along an inshore-offshore gradient. The study was conducted during two different periods of the year: late spring of 1995 and late summer of 1996. The two periods differed in hydrographic conditions and mesoscale processes, which affected the distribution patterns of the different species of chaetognaths found. The diet of the chaetognaths was mainly composed of copepods and differed between species. Prey size was not always strongly related to chaetognath size and for certain species, there was an overlap in prey size spectrum. Trophic niche breadth ton a ratio scale) appeared to be constant with growth. Ingestion rates and predation pressure by chaetognaths did not follow a clear trend related to the mesoscale features in the area, such as the presence of a density front. The impact of chaetognaths on copepod standing stock appeared to be extremely low (