Paul C Frost, Kyle DaSilva, Joseph A Frost-Xenopoulos, Wesley S Burr, Catriona L C Jones
{"title":"Effects of phosphorus enrichment on <i>Daphnia</i>-algae interactions in laboratory microcosms.","authors":"Paul C Frost, Kyle DaSilva, Joseph A Frost-Xenopoulos, Wesley S Burr, Catriona L C Jones","doi":"10.1093/plankt/fbaf002","DOIUrl":null,"url":null,"abstract":"<p><p>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 <i>Daphnia</i> populations, and phosphorus concentrations. Even though we found algal biomass increased over the experiment in low P containers, greater food abundance did not increase <i>Daphnia</i> abundance. In low P containers, a high algal biomass was accompanied with elevated C:P ratios, very low soluble reactive P concentrations and low <i>Daphnia</i> 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 <i>Daphnia</i> abundance. In most of the high P microcosms, rapid increases in <i>Daphnia</i> 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 <i>Daphnia</i> population. Our results show that P supplies can strongly affect <i>Daphnia</i>-algae interactions, but the nature of these effects are likely complicated by internal feedbacks that affect the gain and loss of both populations.</p>","PeriodicalId":16800,"journal":{"name":"Journal of Plankton Research","volume":"47 2","pages":"fbaf002"},"PeriodicalIF":1.9000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11879204/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Plankton Research","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1093/plankt/fbaf002","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}
引用次数: 0
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.
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.