Species composition and diversity of pelagic fishes based on a longline fishery catch in the North Pacific Ocean |
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Authors: | Jiangfeng Zhu Xiaojie Dai Yong Chen |
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Affiliation: | 1. College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China 2. The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai, 201306, China 3. School of Marine Sciences, University of Maine, Orono, ME 04469, USA
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Abstract: | Evaluation of spatial-temporal variability of species composition and diversity in oceanic ecosystems is not easy because
it is usually difficult to obtain sufficient data quantifying such variability. In this study, we examined pelagic species
diversity indicators, species richness, Shannon-Wiener index of diversity and Hurlbert’s species evenness, for fish assemblages
from two areas (north and south) in the North Pacific Ocean (2°–12°N, 178°E–165°W) during May–July 2008. The assemblages were
based on data collected by an onboard scientific observer during a commercial longline fishing trip. The species richness
and Shannon-Wiener diversity index of fish assemblages in the northern area were slightly higher than those in the southern
area, although these differences were not significant (t test, P>0.05). Non-parametric multidimensional scaling and analysis of similarities indicated that there were significant differences
in fish assemblages between the two areas (P<0.01). |
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Keywords: | |
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