Bottom-up and top-down effects of browning and warming on shallow lake food webs.

benthic and pelagic habitats bottom-up and top-down control browning food webs light and nutrients shallow lake top predator warming

Journal

Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746

Informations de publication

Date de publication:
02 2019
Historique:
received: 27 02 2018
revised: 11 10 2018
accepted: 16 10 2018
pubmed: 16 11 2018
medline: 26 3 2019
entrez: 16 11 2018
Statut: ppublish

Résumé

Productivity and trophic structure of aquatic ecosystems result from a complex interplay of bottom-up and top-down forces that operate across benthic and pelagic food web compartments. Projected global changes urge the question how this interplay will be affected by browning (increasing input of terrestrial dissolved organic matter), nutrient enrichment and warming. We explored this with a process-based model of a shallow lake food web consisting of benthic and pelagic components (abiotic resources, primary producers, grazers, carnivores), and compared model expectations with the results of a browning and warming experiment in nutrient-poor ponds harboring a boreal lake community. Under low nutrient conditions, the model makes three major predictions. (a) Browning reduces light and increases nutrient supply; this decreases benthic and increases pelagic production, gradually shifting productivity from the benthic to the pelagic habitat. (b) Because of active habitat choice, fish exert top-down control on grazers and benefit primary producers primarily in the more productive of the two habitats. (c) Warming relaxes top-down control of grazers by fish and decreases primary producer biomass, but effects of warming are generally small compared to effects of browning and nutrient supply. Experimental results were consistent with most model predictions for browning: light penetration, benthic algal production, and zoobenthos biomass decreased, and pelagic nutrients and pelagic algal production increased with browning. Also consistent with expectations, warming had negative effects on benthic and pelagic algal biomass and weak effects on algal production and zoobenthos and zooplankton biomass. Inconsistent with expectations, browning had no effect on zooplankton and warming effects on fish depended on browning. The model is applicable also to nutrient-rich systems, and we propose that it is a useful tool for the exploration of the consequences of different climate change scenarios for productivity and food web dynamics in shallow lakes, the worldwide most common lake type.

Identifiants

pubmed: 30430702
doi: 10.1111/gcb.14521
doi:

Types de publication

Journal Article Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

504-521

Informations de copyright

© 2018 John Wiley & Sons Ltd.

Auteurs

Francisco Rivera Vasconcelos (FR)

Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
Integrated Science Lab - IceLab, Umeå University, Umeå, Sweden.

Sebastian Diehl (S)

Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
Integrated Science Lab - IceLab, Umeå University, Umeå, Sweden.

Patricia Rodríguez (P)

Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.
Austral Centre for Scientific Research (CADIC-CONICET), Ushuaia, Tierra del Fuego, Argentina.

Per Hedström (P)

Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.

Jan Karlsson (J)

Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.

Pär Byström (P)

Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden.

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