Thresholds of freshwater biodiversity in response to riparian vegetation loss in the Neotropical region

Dala-Corte, Renato B., Melo, Adriano S., Siqueira, Tadeu, Bini, Luis M., Martins, Renato T., Cunico, Almir M., Pes, Ana M., Magalhães, André L.B., Godoy, Bruno S., Leal, Cecília G., Monteiro-Júnior, Claudio S., Stenert, Cristina, Castro, Diego M.P., Macedo, Diego R., Lima-Junior, Dilermando P., Gubiani, Éder A., Massariol, Fabiana C., Teresa, Fabrício B., Becker, Fernando G., Souza, Francine N., Valente-Neto, Francisco, Souza, Franco L., Salles, Frederico F., Brejão, Gabriel L., Brito, Janaina G., Vitule, Jean R.S., Simião-Ferreira, Juliana, Dias-Silva, Karina, Albuquerque, Laysson, Juen, Leandro, Maltchik, Leonardo, Casatti, Lilian, Montag, Luciano, Rodrigues, Marciel E., Callisto, Marcos, Nogueira, Maria A.M., Santos, Mireile R., Hamada, Neusa, Pamplin, Paulo A.Z., Pompeu, Paulo S., Leitão, Rafael P., Ruaro, Renata, Mariano, Rodolfo, Couceiro, Sheyla R.M., Abilhoa, Vinícius, Oliveira, Vivian C., Shimano, Yulie, Moretto, Yara, Súarez, Yzel R., and de O. Roque, Fabio (2020) Thresholds of freshwater biodiversity in response to riparian vegetation loss in the Neotropical region. Journal of Applied Ecology, 57 (7). pp. 1391-1402.

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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.

Item ID: 66800
Item Type: Article (Research - C1)
ISSN: 1365-2664
Keywords: forest code, freshwater, land use, native vegetation, private property, riparian reserves, stream fauna, tipping point
Copyright Information: © 2020 British Ecological Society
Funders: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES), Fundação de Amparo à Pesquisa do Estado de Goiás (FAPEG)
Projects and Grants: CNPq grant award no. 465610/2014-5, FAPEG grant no. 201810267000023
Date Deposited: 19 May 2021 04:05
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310304 Freshwater ecology @ 50%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 50%
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