Selective and context-dependent effects of chemical stress across trophic levels at the basis of marine food webs

Christoph Mensens, Frederik De Laender, Colin R. Janssen, Frances Camille Rivera, Koen Sabbe, Marleen De Troch

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Human activities increasingly impact the functioning of marine food webs, but anthropogenic stressors are seldom included in ecological study designs. Diet quality, as distinct from just diet quantity, has moreover rarely been highlighted in food web studies in a stress context. We measured the effects of metal and pesticide stress (copper and atrazine) on the contribution of a benthic intertidal diatom community to two processes that are key to the functioning of intertidal systems: biomass (diet quantity) and lipid (diet quality) production. We then examined if stressors affected diatom functioning by selectively targeting the species contributing most to functioning (selective stress effects) or by changing the species’ functional contribution (context-dependent effects). Finally, we tested if stress-induced changes in diet quality altered the energy flow to the diatoms’ main grazers (harpacticoid copepods). Diatom diet quantity was reduced by metal stress but not by low pesticide levels due to the presence of an atrazine-tolerant, mixotrophic species. Selective effects of the pesticide reduced diatom diet quality by 60% and 75% at low and high pesticide levels respectively, by shifting diatom community structure from dominance by lipid-rich species toward dominance by an atrazine-tolerant, but lipid-poor, species. Context-dependent effects did not affect individual diatom lipid content at low levels of both stressors, but caused diatoms to lose 40% of their lipids at high copper stress. Stress-induced changes in diet quality predicted the energy flow from the diatoms to their copepod consumers, which lost half of their lipids when feeding on diatoms grown under low and high pesticide and high metal stress. Selective pesticide effects were a more important threat for trophic energy transfer than context-dependent effects of both stressors, with shifts in diatom community structure affecting the energy flow to their copepod grazers at stress levels where no changes in diatom lipid content were detected.

langue originaleAnglais
Pages (de - à)1342-1353
Nombre de pages12
journalEcological applications
Volume28
Numéro de publication5
Les DOIs
étatPublié - 1 juil. 2018

Empreinte digitale

trophic level
food web
diatom
diet
lipid
pesticide
energy flow
atrazine
effect
chemical
metal
community structure
copper
targeting
human activity

Citer ceci

Mensens, Christoph ; De Laender, Frederik ; Janssen, Colin R. ; Rivera, Frances Camille ; Sabbe, Koen ; De Troch, Marleen. / Selective and context-dependent effects of chemical stress across trophic levels at the basis of marine food webs. Dans: Ecological applications. 2018 ; Vol 28, Numéro 5. p. 1342-1353.
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abstract = "Human activities increasingly impact the functioning of marine food webs, but anthropogenic stressors are seldom included in ecological study designs. Diet quality, as distinct from just diet quantity, has moreover rarely been highlighted in food web studies in a stress context. We measured the effects of metal and pesticide stress (copper and atrazine) on the contribution of a benthic intertidal diatom community to two processes that are key to the functioning of intertidal systems: biomass (diet quantity) and lipid (diet quality) production. We then examined if stressors affected diatom functioning by selectively targeting the species contributing most to functioning (selective stress effects) or by changing the species’ functional contribution (context-dependent effects). Finally, we tested if stress-induced changes in diet quality altered the energy flow to the diatoms’ main grazers (harpacticoid copepods). Diatom diet quantity was reduced by metal stress but not by low pesticide levels due to the presence of an atrazine-tolerant, mixotrophic species. Selective effects of the pesticide reduced diatom diet quality by 60{\%} and 75{\%} at low and high pesticide levels respectively, by shifting diatom community structure from dominance by lipid-rich species toward dominance by an atrazine-tolerant, but lipid-poor, species. Context-dependent effects did not affect individual diatom lipid content at low levels of both stressors, but caused diatoms to lose 40{\%} of their lipids at high copper stress. Stress-induced changes in diet quality predicted the energy flow from the diatoms to their copepod consumers, which lost half of their lipids when feeding on diatoms grown under low and high pesticide and high metal stress. Selective pesticide effects were a more important threat for trophic energy transfer than context-dependent effects of both stressors, with shifts in diatom community structure affecting the energy flow to their copepod grazers at stress levels where no changes in diatom lipid content were detected.",
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Selective and context-dependent effects of chemical stress across trophic levels at the basis of marine food webs. / Mensens, Christoph; De Laender, Frederik; Janssen, Colin R.; Rivera, Frances Camille; Sabbe, Koen; De Troch, Marleen.

Dans: Ecological applications, Vol 28, Numéro 5, 01.07.2018, p. 1342-1353.

Résultats de recherche: Contribution à un journal/une revueArticle

TY - JOUR

T1 - Selective and context-dependent effects of chemical stress across trophic levels at the basis of marine food webs

AU - Mensens, Christoph

AU - De Laender, Frederik

AU - Janssen, Colin R.

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KW - atrazine

KW - chemical stress

KW - copepods

KW - copper

KW - diatoms

KW - energy flow

KW - fatty acids

KW - marine food webs

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