Removal of intertidal grazers by human harvesting leads to alteration of species interactions, community structure and resilience to climate change

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dc.contributor.authorChaverra, Ana
dc.contributor.authorWieters, Evie
dc.contributor.authorFoggo, Andy
dc.contributor.authorKnights, Antony M.
dc.date.accessioned2025-01-23T21:15:09Z
dc.date.available2025-01-23T21:15:09Z
dc.date.issued2019
dc.description.abstractExtreme fluctuations in abiotic conditions can induce a biological stress response (e.g. bleaching) detrimental to an organism's health. In some instances, organisms can recover if conditions are alleviated, such as through co-occurrence with other species that confer protection. Biodiverse, multitrophic communities are increasingly recognised as important promoters of species persistence and resilience under environmental change. On intertidal shores, the role of grazers as top-down determinants of algal community structure is well recognised. Similarly, the harvesting of grazers for human consumption is increasingly prevalent with potential to greatly alter the community dynamics. Here, we assess how differences in harvesting pressure of grazers under three management regimes (no-take; managed access; open-access) alters the trophic interactions between grazers, and algal communities. Grazer density and body size frequencies were different among regimes leading to changes in the photosynthetic performance and recovery of crustose coralline algae (CCA) post-bleaching, as well as their presence altering the strength of interactions between species. The exclusion of grazers from patches using cages led to different emergent communities and reduced negative correlations between taxa. The absence of larger grazers (> 9 cm) at the managed access site led to macroalgal overgrowth of bleached CCA negatively affecting its recovery, whereas no-take or open-access led to a moderated algal growth and a shift from competitive to facilitative interactions between algal species. Given that CCA play an important role in the population growth and development of other species, the choice of management measure should be carefully considered before implementation, depending on objectives.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.marenvres.2019.03.003
dc.identifier.eissn1879-0291
dc.identifier.issn0141-1136
dc.identifier.urihttps://doi.org/10.1016/j.marenvres.2019.03.003
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101070
dc.identifier.wosidWOS:000467511000006
dc.language.isoen
dc.pagina.final65
dc.pagina.inicio57
dc.revistaMarine environmental research
dc.rightsacceso restringido
dc.subjectEnvironmental change
dc.subjectEcosystem management
dc.subjectMPA
dc.subjectConservation
dc.subjectHerbivory
dc.subject.ods14 Life Below Water
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa14 Vida submarina
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleRemoval of intertidal grazers by human harvesting leads to alteration of species interactions, community structure and resilience to climate change
dc.typeartículo
dc.volumen146
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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