Stochastic colonisation dynamics can be a major driver of temporal beta diversity in Atlantic Forest coastal stream communities

Autor(es)

Saito, Victor S. ^[1] ; Stoppa, Nathalia E. ^[1] ; Shimabukuro, Erika M. ^[2] ; Canedo-Arguelles, Miguel ^[3] ; Bonada, Nuria ^[4] ; Siqueira, Tadeu ^[5]

Afiliação do(s) autor(es)

^[1] Fed Univ Sao Carlos UFSCar, Environm Sci Dept, Rod Washington Luis Km 235 SP 310, Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Museum Zool, Sao Paulo - Brazil

^[3] Univ Barcelona UB, Inst Recerca Aigua IdRA, Freshwater Ecol Hydrol & Management FEHM Res Grp, Dept Biol Evolut Ecol & Ciencies Ambientals, Fac B, Barcelona - Spain

^[4] Univ Barcelona UB, Inst Recerca Biodiversitat IRBio, Freshwater Ecol Hydrol & Management FEHM Res Grp, Dept Biol Evolut Ecol & Ciencies Ambientals, Fac B, Barcelona - Spain

^[5] Sao Paulo State Univ Unesp, Inst Biosci, Rio Claro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Freshwater Biology; v. 66, n. 8, p. 1560-1570, AUG 2021.
• Citações Web of Science: 1

Resumo

Biodiversity is structured in space and time, yet our understanding about the temporal variation of biological communities is still limited. Recent work suggests that temporal beta diversity should be lowest in unpredictable systems with low seasonality, as expected for tropical ecosystems. However, this hypothesis remains largely unexplored. Here, we analysed the temporal dynamics of Atlantic Forest coastal stream caddisfly assemblages sampled simultaneously along four years, resulting in 99 unique site-time combinations. Given that the region we studied is expected to have low climatic seasonality and low environmental harshness, we expected to find: (1) unseasonal variation in community composition; (2) equal contribution of nestedness and turnover to beta diversity; (3) weak correlation between variation in community composition and in environmental variables; and (4) temporal beta diversity similar to that expected by neutral dynamics. Using wavelet analysis we found that, in spite of general temperature stability, precipitation was highly seasonal but unpredictable at the monthly scale. We found high temporal beta diversity, with a larger contribution of nestedness due to an overall decrease in abundance and diversity during months characterised by heavy rain events. We also found that community composition was moderately structured in space, suggesting that both local in-stream characteristics and dispersal limitation drive community reassembly after heavy rain events. Null model analysis indicated that observed short-term beta diversity was not distinct from that expected by chance (i.e. produced by null simulations). This suggests an important role of stochastic colonisation and dispersal limitation in the temporal organisation of Atlantic Forest stream assemblages. Since heavy rain events strongly disassemble communities that are then randomly recolonised, and considering the current scenario of climate change, increased extreme events of precipitation could lead to unpredictable changes in biodiversity in tropical regions. (AU)

• Processo FAPESP: 19/04033-7 - Persistência de metacomunidades em ecossistemas altamente variáveis
• Beneficiário: Tadeu de Siqueira Barros
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 13/50424-1 - Scaling biodiversity in tropical and boreal streams: implications for diversity mapping and environmental assessment (ScaleBio)
• Beneficiário: Tadeu de Siqueira Barros
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/20540-0 - Processos em metacomunidades: fatores ecológicos, evolutivos e espaciais estruturando as comunidades de macroinvertebrados aquáticos
• Beneficiário: Victor Satoru Saito
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/23111-6 - Avançando o biomonitoramento tropical: descrição detalhada da variação temporal das comunidades de Trichoptera
• Beneficiário: Nathalia Espinossi Stoppa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Iniciação Científica
• Processo FAPESP: 12/51511-2 - Estrutura e dinâmica de comunidades em rios e riachos costeiros da Mata Atlântica, Bacia do Rio Itanhaém (PelD)
• Beneficiário: Antonio Fernando Monteiro Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 17/12138-8 - As métricas de biomonitoramento são robustas às variações temporais naturais em comunidades aquáticas?
• Beneficiário: Nathalia Espinossi Stoppa
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica