Deviation from strict homeostasis across multiple trophic levels in an invertebrate consumer assemblage exposed to high chronic phosphorus enrichment in a Neotropical stream.

Oecologia
Gaston E Small, Catherine Pringle

Abstract

A central tenet of ecological stoichiometry is that consumer elemental composition is relatively independent of food resource nutrient content. Although the P content of some invertebrate consumer taxa can increase as a consequence of P-enriched food resources, little is known about how ecosystem nutrient loading can affect the elemental composition of entire consumer assemblages. Here we examine the potential for P enrichment across invertebrate consumer assemblages in response to chronic high P loading. We measured elemental ratios in invertebrate consumers and basal food resources in a series of streams in lowland Costa Rica that range widely in P levels (2-135 microg l(-1) soluble reactive P). Streams with high P levels receive natural long-term (over millennia) inputs of solute-rich groundwater while low-P streams do not receive these solute-rich groundwater inputs. P content of leaf litter and epilithon increased fourfold across the natural P gradient, exceeding basal resource P content values reported in the literature from other nutrient-rich streams. Invertebrate consumers from the high-P study stream were elevated twofold in P content across multiple taxonomic and functional feeding groups, including predators. Our re...Continue Reading

References

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Citations

Jun 27, 2014·Ecology and Evolution·Rana W El-SabaawiAlexander Flecker
Oct 2, 2014·Journal of Plant Physiology·Jofre CarnicerJosep Peñuelas
Oct 19, 2016·Oecologia·Jeffrey P StephensThomas R Raffel
Dec 23, 2016·Biological Reviews of the Cambridge Philosophical Society·Carla L AtkinsonMichael J Vanni
Feb 22, 2017·Global Change Biology·Jacob E AllgeierCraig A Layman
Sep 25, 2018·Biological Reviews of the Cambridge Philosophical Society·Amanda L Subalusky, David M Post

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