Role of food web interactions in promoting resilience to nutrient enrichment in a brackish water eelgrass (Zostera marina ) ecosystem

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http://hdl.handle.net/10138/333323

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Gagnon , K , Gustafsson , C , Salo , T , de Rossi , F , Gunell , S , Richardson , J P , Reynolds , P L , Duffy , J E & Boström , C 2021 , ' Role of food web interactions in promoting resilience to nutrient enrichment in a brackish water eelgrass (Zostera marina ) ecosystem ' , Limnology and Oceanography , vol. 66 , no. 7 , pp. 2810-2826 . https://doi.org/10.1002/lno.11792

Titel: Role of food web interactions in promoting resilience to nutrient enrichment in a brackish water eelgrass (Zostera marina ) ecosystem
Författare: Gagnon, Karine; Gustafsson, Camilla; Salo, Tiina; de Rossi, Francesca; Gunell, Sonja; Richardson, J. Paul; Reynolds, Pamela L.; Duffy, J. Emmett; Boström, Christoffer
Upphovmannens organisation: Biological stations
Ecosystems and Environment Research Programme
Tvärminne Zoological Station
Marine Ecosystems Research Group
Tvärminne Benthic Ecology Team
Datum: 2021-07
Språk: eng
Sidantal: 17
Tillhör serie: Limnology and Oceanography
ISSN: 0024-3590
DOI: https://doi.org/10.1002/lno.11792
Permanenta länken (URI): http://hdl.handle.net/10138/333323
Abstrakt: Understanding the ecological interactions that enhance the resilience of threatened ecosystems is essential in assuring their conservation and restoration. Top-down trophic interactions can increase resilience to bottom-up nutrient enrichment, however, as many seagrass ecosystems are threatened by both eutrophication and trophic modifications, understanding how these processes interact is important. Using a combination of approaches, we explored how bottom-up and top-down processes, acting individually or in conjunction, can affect eelgrass meadows and associated communities in the northern Baltic Sea. Field surveys along with fish diet and stable isotope analyses revealed that the eelgrass trophic network included two main top predatory fish species, each of which feeds on a separate group of invertebrate mesograzers (crustaceans or gastropods). Mesograzer abundance in the study area was high, and capable of mitigating the effects of increased algal biomass that resulted from experimental nutrient enrichment in the field. When crustacean mesograzers were experimentally excluded, gastropod mesograzers were able to compensate and limit the effects of nutrient enrichment on eelgrass biomass and growth. Our results suggest that top-down processes (i.e., suppression of algae by different mesograzer groups) may ensure eelgrass resilience to nutrient enrichment in the northern Baltic Sea, and the existence of multiple trophic pathways can provide additional resilience in the face of trophic modifications. However, the future resilience of these meadows is likely threatened by additional local stressors and global environmental change. Understanding the trophic links and interactions that ensure resilience is essential for managing and conserving these important ecosystems and the services they provide.
Subject: CARBON
COASTAL FISH
COMMUNITY STRUCTURE
DELTA-C-13
DIVERSITY
NITROGEN
RELATIVE IMPORTANCE
SEAGRASS WASTING DISEASE
TOP-DOWN CONTROL
TROPHIC INTERACTIONS
1181 Ecology, evolutionary biology
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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