Food web changes associated with drought and invasive species in a tropical semiarid reservoir

Bezerra, Luis Artur Valões; Angelini, Ronaldo; Vitule, Jean Ricardo Simões; Coll, Marta; Sánchez-Botero, Jorge Iván

Food web changes associated with drought and invasive species in a tropical semiarid reservoir

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dc.contributor.author	Bezerra, Luis Artur Valões
dc.contributor.author	Angelini, Ronaldo
dc.contributor.author	Vitule, Jean Ricardo Simões
dc.contributor.author	Coll, Marta
dc.contributor.author	Sánchez-Botero, Jorge Iván
dc.date.accessioned	2020-11-24T18:50:46Z
dc.date.available	2020-11-24T18:50:46Z
dc.date.issued	2017
dc.description.resumo	Fish and invertebrates are introduced in freshwaters around the world for commercial purposes, despite widely known impacts on food webs and biological invasions. As a proxy for artificial environments, we modeled a typical reservoir in a Brazilian semiarid region using an ecosystem approach. We compared the role of native and non-native invasive species (NIS) in the food web, between dry and wet periods, and under the influence of an extreme drought period (from 2011 to 2015), simulating the variation in fish biomasses due to decreasing consumption. Key ecosystem groups were fishes (mainly NIS), birds, and insects. Nutrient cycling was dependent on invaders, while the trophic structure was detritus based during the drought. Biomass of detritivores was almost two times higher than herbivores, and native fish species decreased abruptly in response to invaders and volume variation. The dominance of low-trophic levels (TLII) and tilapia—Oreochromis niloticus (Linnaeus, 1758) and other tilapiines—resulted from interactions among invaders, feeding behavior on benthos, and environmental seasonality, tending toward biotic homogenization (“benthification”) at the ecosystem level. An increasing relevance of detritivores with cascading effects in ecosystems subject to drought, multiple introductions, and ubiquitous food sources has clear implications for the fisheries and the water quality	pt_BR
dc.identifier.citation	BEZERRA, L.A.V.; ANGELINI, R.; VITULE, J.R.S.; COLL, M.; SÁNCHEZ-BOTERO, J.I.. Food web changes associated with drought and invasive species in a tropical semiarid reservoir. Hydrobiologia, v. 804, p. 10.1007/s10750-15, 2017. Disponível em: https://link.springer.com/article/10.1007%2Fs10750-017-3432-8. Acesso em: 13 nov. 2020. https://doi.org/10.1007/s10750-017-3432-8	pt_BR
dc.identifier.doi	10.1007/s10750-017-3432-8
dc.identifier.issn	0018-8158
dc.identifier.issn	1573-5117
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30663
dc.language	en	pt_BR
dc.publisher	Springer	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Non-native ichthyofauna	pt_BR
dc.subject	Brazilian semiarid	pt_BR
dc.subject	Ecosystem approach	pt_BR
dc.subject	Ecopath with Ecosim	pt_BR
dc.subject	Cichla spp	pt_BR
dc.subject	Dryland fish	pt_BR
dc.title	Food web changes associated with drought and invasive species in a tropical semiarid reservoir	pt_BR
dc.type	article	pt_BR