Regime shifts in coastal lagoons: Evidence from free-living marine nematodes

Netto, Sérgio Antonio; Fonseca, Gustavo

Regime shifts in coastal lagoons: Evidence from free-living marine nematodes

dc.contributor.author	Netto, Sérgio Antonio
dc.contributor.author	Fonseca, Gustavo
dc.coverage.spatial	Estados Unidos	pt_BR
dc.date.accessioned	2018-10-16T20:05:12Z
dc.date.accessioned	2020-11-26T17:40:53Z
dc.date.available	2018-10-16T20:05:12Z
dc.date.available	2020-11-26T17:40:53Z
dc.date.issued	2017	pt_BR
dc.description.abstract	We test the validity of using the regime shift theory to account for differences in environmental state of coastal lagoons as a response to variation in connectivity with the sea, using free-living nematodes as a surrogate. The study is based on sediment samples from the inner and outer portions of 15 coastal lagoons (5 open to the sea, 5 intermittently open/ closed, and 5 permanently closed lakes) along the southern coast of Brazil. Environmental data suggested that there are two contrasting environmental conditions, with coastal lakes being significantly different from open and intermittent lagoons. Marine nematode assemblages corroborate these two mutually exclusive alternative stable states (open vs. closed systems), but assemblages from the intermittently open/closed lagoons showed a gradual change in species composition between both systems independently of the environmental conditions. The gradient in the structural connectivity among lagoons and the sea, due to their regime shifts, changes the movement of resources and consumers and the internal physico-chemical gradients, directly affecting regional species diversity. Whereas openness to the sea increased similarity in nematode assemblage composition among connected lagoons, isolation increased dissimilarity among closed lagoons. Our results from a largescale sampling program indicated that as lagoons lose connectivity with the sea, shifting the environmental state, local processes within individual intermittently open/closed lagoons and particularly within coastal lakes become increasingly more important in structuring these communities. The main implication of these findings is that depending on the local stable state we may end up with alternative regional patterns of biodiversity.	pt_BR
dc.description.sponsorship	FAPESC, CNPq	pt_BR
dc.format.extent	1-19	pt_BR
dc.identifier	Fevereiro	pt_BR
dc.identifier.issn	1932-6203	pt_BR
dc.identifier.uri	https://repositorio.animaeducacao.com.br/handle/ANIMA/2672
dc.language.iso	en_US	pt_BR
dc.relation.ispartofseries	12	pt_BR
dc.rights	Attribution-NoDerivs 3.0 Brazil
dc.rights.uri	http://creativecommons.org/licenses/by-nd/3.0/br/
dc.subject	Coastal lagoon	pt_BR
dc.title	Regime shifts in coastal lagoons: Evidence from free-living marine nematodes	pt_BR
dc.title.alternative	Regime shifts in coastal lagoons: Evidence from free-living marine nematodes	pt_BR
dc.type	Artigo de Periodico	pt_BR
local.affiliation.ies	Unisul
local.author.curso	Produção Científica	pt_BR
local.author.unidade	Ânima	pt_BR
local.rights.policy	Acesso aberto	pt_BR
local.subject.area	Ciências Biológicas	pt_BR
local.subject.areaanima	Ciências Humanas	pt_BR