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dc.contributor.authorLing, S. D.-
dc.contributor.authorScheibling, R. E.-
dc.contributor.authorRassweiler, A.-
dc.contributor.authorJohnson, C. R.-
dc.contributor.authorShears, N.-
dc.contributor.authorConnell, S. D.-
dc.contributor.authorSalomon, A. K.-
dc.contributor.authorNorderhaug, K. M.-
dc.contributor.authorPérez-Matus, A.-
dc.contributor.authorHernández, J. C.-
dc.contributor.authorClemente, S.-
dc.contributor.authorBlamey, L. K.-
dc.contributor.authorHereu, Bernat-
dc.contributor.authorBallesteros, Enric-
dc.contributor.authorSala, Enric-
dc.contributor.authorGarrabou, Joaquim-
dc.contributor.authorCebrian, Emma-
dc.contributor.authorZabala, Mikel-
dc.contributor.authorFujita, D.-
dc.contributor.authorJohnson, L. E.-
dc.identifier.citationPhilosophical Transactions - B - Biological Sciences 370(1659): 20130269 (2015)es_ES
dc.description.abstractA pronounced, widespread and persistent regime shift among marine ecosystems is observable on temperate rocky reefs as a result of sea urchin overgrazing. Here, we empirically define regime-shift dynamics for this grazing system which transitions between productive macroalgal beds and impoverished urchin barrens. Catastrophic in nature, urchin overgrazing in a well-studied Australian system demonstrates a discontinuous regime shift, which is of particular management concern as recovery of desirable macroalgal beds requires reducing grazers to well below the initial threshold of overgrazing. Generality of this regime-shift dynamic is explored across 13 rocky reef systems (spanning 11 different regions from both hemispheres) by compiling available survey data (totalling 10 901 quadrats surveyed in situ) plus experimental regime-shift responses (observed during a total of 57 in situ manipulations). The emergent and globally coherent pattern shows urchin grazing to cause a discontinuous ‘catastrophic’ regime shift, with hysteresis effect of approximately one order of magnitude in urchin biomass between critical thresholds of overgrazing and recovery. Different life-history traits appear to create asymmetry in the pace of overgrazing versus recovery. Once shifted, strong feedback mechanisms provide resilience for each alternative state thus defining the catastrophic nature of this regime shift. Importantly, human-derived stressors can act to erode resilience of desirable macroalgal beds while strengthening resilience of urchin barrens, thus exacerbating the risk, spatial extent and irreversibility of an unwanted regime shift for marine ecosystems.es_ES
dc.publisherRoyal Society (Great Britain)es_ES
dc.subjectKelp bedses_ES
dc.subjectSea urchin barrenses_ES
dc.subjectAlternative stable stateses_ES
dc.subjecttipping pointes_ES
dc.titleGlobal regime shift dynamics of catastrophic sea urchin overgrazinges_ES
dc.description.peerreviewedPeer reviewedes_ES
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