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• W3094498489 abstract "Abstract Trophic downgrading in coastal waters has occurred globally during recent decades. On temperate rocky reefs, this has resulted in widespread kelp deforestation and the formation of sea urchin barrens. We hypothesize that the intact kelp forest communities are more spatially variable than the downgraded urchin barren communities, and that these differences are greatest at small spatial scales where the influence of competitive and trophic interactions is strongest. To address this, benthic community surveys were done in kelp forests and urchin barrens at nine islands spanning 1230 km of the Aleutian Archipelago where the loss of predatory sea otters has resulted in the trophic downgrading of the region’s kelp forests. We found more species and greater total spatial variation in community composition within the kelp forests than in the urchin barrens. Further, the kelp forest communities were most variable at small spatial scales (within each forest) and least variable at large spatial scales (among forests on different islands), while the urchin barren communities followed the opposite pattern. This trend was consistent for different trophic guilds (primary producers, grazers, filter feeders, predators). Together, this suggests that Aleutian kelp forests create variable habitats within their boundaries, but that the communities within these forests are generally similar across the archipelago. In contrast, urchin barrens exhibit relatively low variability within their boundaries, but these communities vary substantially among different barrens across the archipelago. We propose this represents a shift from small-scale biological control to large-scale oceanographic control of these communities." @default.
• W3094498489 created "2020-10-29" @default.
• W3094498489 creator A5085936810 @default.
• W3094498489 creator A5090976899 @default.
• W3094498489 date "2020-10-22" @default.
• W3094498489 modified "2023-10-12" @default.
• W3094498489 title "Trophic downgrading reduces spatial variability on rocky reefs" @default.
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• W3094498489 doi "https://doi.org/10.1038/s41598-020-75117-2" @default.
• W3094498489 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7581756" @default.
• W3094498489 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33093542" @default.
• W3094498489 hasPublicationYear "2020" @default.
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