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Title: Thresholds of freshwater biodiversity in response to riparian vegetation loss in the Neotropical region
Authors: Dala-Corte, Renato Bolson
Melo, Adriano Sanches
Siqueira, Tadeu
Bini, Luis Mauricio
Martins, Renato Tavares
Cunico, A. M.
Pes, A. M.
Magalhães, André Lincoln Barroso de
Godoy, Bruno Spacek
Leal, Cecília Gontijo
Monteiro-Júnior, Cláudio da Silva
Stenert, Cristina
Castro, Diego M.Parreira De
Macedo, Diego Rodrigues
Lima-Junior, D. P.
Gubiani, Éder André
Massariol, Fabiana Criste
Teresa, Fabrício Barreto
Becker, Fernando Gertum
Souza, Francine Novais
Valente-Neto, Francisco C.
Souza, Franco L.
Salles, Frederico Falcaõ
Brej?o, Gabriel Louren?o
Brito, Janaina G.
Simões Vitule, Jean Ricardo
Simião-Ferreira, Juliana
Dias-Silva, Karina
Albuquerque, Laysson
Juen, Leandro
Maltchik, Leonardo
Casatti, Lilian
Montag, Luciano F.A.
Rodrigues, Marciel Elio
Callisto, Marcos
Nogueira, Maria A.M.
Santos, Mireile R.
Hamada, Neusa
Pamplin, Paulo Augusto Zaitune
dos Santos Pompeu, Paulo
Leitão, Rafael Pereira
Ruaro, Renata
Mariano, Rodolfo
Couceiro, Sheyla R.M.
Abilhôa, Vinícius
Oliveira, Vívian Campos de
Shimano, Yulie
Moretto, Yara
Suárez, Yzel Rondón
Oliveira, Roque, Fabio de
Keywords: Forest Code
Fresh Water
Land Use
native vegetation
private property
riparian reserves
stream fauna
tipping point
Issue Date: 2020
metadata.dc.publisher.journal: Journal of Applied Ecology
Abstract: Protecting riparian vegetation around streams is vital in reducing the detrimental effects of environmental change on freshwater ecosystems and in maintaining aquatic biodiversity. Thus, identifying ecological thresholds is useful for defining regulatory limits and for guiding the management of riparian zones towards the conservation of freshwater biota. Using nationwide data on fish and invertebrates occurring in small Brazilian streams, we estimated thresholds of native vegetation loss in which there are abrupt changes in the occurrence and abundance of freshwater bioindicators and tested whether there are congruent responses among different biomes, biological groups and riparian buffer sizes. Mean thresholds of native vegetation cover loss varied widely among biomes, buffer sizes and biological groups: ranging from 0.5% to 77.4% for fish, from 2.9% to 37.0% for aquatic invertebrates and from 3.8% to 43.2% for a subset of aquatic invertebrates. Confidence intervals for thresholds were wide, but the minimum values of these intervals were lower for the smaller riparian buffers (50 and 100 m) than larger ones (200 and 500 m), indicating that land use should be kept away from the streams. Also, thresholds occurred at a lower percentage of riparian vegetation loss in the smaller buffers, and were critically lower for invertebrates: reducing only 6.5% of native vegetation cover within a 50-m riparian buffer is enough to cross thresholds for invertebrates. Synthesis and applications. The high variability in biodiversity responses to loss of native riparian vegetation suggests caution in the use of a single riparian width for conservation actions or policy definitions nationwide. The most sensitive bioindicators can be used as early warning signals of abrupt changes in freshwater biodiversity. In practice, maintaining at least 50-m wide riparian reserves on each side of streams would be more effective to protect freshwater biodiversity in Brazil. However, incentives and conservation strategies to protect even wider riparian reserves (~100 m) and also taking into consideration the regional context will promote a greater benefit. This information should be used to set conservation goals and to create complementary mechanisms and policies to protect wider riparian reserves than those currently required by the federal law. © 2020 British Ecological Society
metadata.dc.identifier.doi: 10.1111/1365-2664.13657
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