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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45371

Title: Effects of increasing nutrient supply and omnivorous feeding on the size spectrum slope: a size-based nutrient – phytoplankton - zooplankton model.
Authors: Pei-Chi Ho;Chun-Wei Chang;Chih Hao Hsieh;Fuh-Kwo Shiah;Takeshi Miki
Contributors: 國立臺灣海洋大學:海洋環境與生態研究所
Keywords: Feeding breadth;New nutrient flux;Non-equilibrium dynamics;Nutrient-phytoplankton-zooplankton model;Plankton size spectrum
Date: 2013-04
Issue Date: 2018-03-15T07:32:09Z
Publisher: Population Ecology
Abstract: Abstract:Size spectrum slope has been considered as an indicator for system productivity and size-dependent trophic interactions in plankton communities. We investigated the effect of new nutrient flux (N in ) and feeding breadth of zooplankton (σ2) on spectral slopes of the plankton community using a size-structured nutrient-phytoplankton-zooplankton model. We studied two types of plankton systems (1) at a steady state and (2) with fluctuating plankton populations. For the steady state systems, the spectral slopes increased with N in and σ2. In contrast, for the systems in fluctuation, spectral slopes constructed from long-term average plankton populations decreased with increasing N in and σ2. In addition to spectral slopes constructed from long-term average population densities, we investigated slope variability in systems with fluctuating plankton populations. The variability of spectral slopes was found to increase with N in and σ2, indicating that spectral slope variation is large in a eutrophic system or when zooplankton feed on a wide size range of prey. Empirically, because N in is difficult to measure, nutrient concentration is investigated instead. Our model predicts that the spectral slope is positively correlated with nutrient concentration due to the accumulated mesozooplankton biomass, which was confirmed by our study in plankton community in a subtropical reservoir in Taiwan.
Relation: 55(2) pp.247-259
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45371
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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