Nutrient excretion by fish supports a variable but significant proportion of lake primary productivity over 15 years.

Animals play an important and sometimes overlooked role in nutrient cycling. The role of animals in nutrient cycling is spatially and temporally variable, but few studies have evaluated the long-term importance of animal-mediated nutrient cycling in meeting nutrient demand by primary producers. We quantified the proportion of phytoplankton nutrient (phosphorus, P) demand met by excretion by gizzard shad, (Dorosoma cepedianum) in a eutrophic reservoir where this species dominates fish biomass. From 2000-2014, gizzard shad excretion supported a variable proportion of phytoplankton P demand, averaging 7-27% among years over the growing season (spring and summer). temporal patterns emerged, as gizzard shad consistently supported a higher proportion of demand during summer (mean 31%) than spring (8%). In spring, the proportion of demand met from gizzard shad excretion was best predicted by gizzard shad population biomass, stream discharge, and temperature. In summer, this proportion was best predicted only by biomass of the young-of-year (YOY) gizzard shad. Thus, variation in YOY shad biomass significantly alters nutrient supply, and future studies should explore the long-term role of animal population dynamics in nutrient cycling. Our study shows that several years of data are needed to critically evaluate the importance of animals in meeting ecosystem nutrient demand.

• Publication year

  2021

• Venue

  Ecology

• Publication date

  2021-04-09

• Fields of study

  Medicine, Environmental Science

• Identifiers
  DOI 10.1002/ecy.3364PMID 33834475
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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