Effects of phosphorus enrichment on Daphnia-algae interactions in laboratory microcosms.

IF 1.9 3区 环境科学与生态学 Q2 MARINE & FRESHWATER BIOLOGY
Paul C Frost, Kyle DaSilva, Joseph A Frost-Xenopoulos, Wesley S Burr, Catriona L C Jones
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Abstract

We examined the effects of phosphorus (P) on algal biomass and stoichiometry and, subsequently, alterations to zooplankton populations. We modified P supply in microcosms and tracked changes in algal and Daphnia populations, and phosphorus concentrations. Even though we found algal biomass increased over the experiment in low P containers, greater food abundance did not increase Daphnia abundance. In low P containers, a high algal biomass was accompanied with elevated C:P ratios, very low soluble reactive P concentrations and low Daphnia fecundity. High algal C:P ratios and low soluble reactive P concentrations in these microcosms indicated a strong P-limitation of algae and food quality constraints on consumer populations. In high P containers, algal biomass initially increased, which led to an increased Daphnia abundance. In most of the high P microcosms, rapid increases in Daphnia populations led to reduced algal biomass and increased concentrations of soluble reactive P. However, in an outlier high P container, we found a different pattern with elevated algal biomass, low soluble reactive P concentrations and a very large Daphnia population. Our results show that P supplies can strongly affect Daphnia-algae interactions, but the nature of these effects are likely complicated by internal feedbacks that affect the gain and loss of both populations.

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来源期刊
Journal of Plankton Research
Journal of Plankton Research 生物-海洋学
CiteScore
3.50
自引率
9.50%
发文量
65
审稿时长
1 months
期刊介绍: Journal of Plankton Research publishes innovative papers that significantly advance the field of plankton research, and in particular, our understanding of plankton dynamics.
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