Abiotic variability among different aquatic systems of the central Amazon floodplain during drought and flood events

Autor(es)

Affonso, A. G. ^[1] ; Queiroz, H. L. ^[2] ; Novo, E. M. L. M. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais, Div Sensoriamento Remoto, BR-12227010 Sao Jose Dos Campos, SP - Brazil

^[2] Inst Desenvolvimento Sustentavel Mamiraua, BR-69470000 Tefe, AM - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Biology; v. 75, n. 4, S, p. S60-S69, NOV 2015.
• Citações Web of Science: 4

Resumo

This paper examines water properties from lakes, (depression lakes, sensu Junk et al., 2012), channels (scroll lakes with high connectivity, sensu Junk et al., 2012) and paleo-channels (scroll lakes with low connectivity-sensu Junk et al., 2012, locally called ressacas) located in Mamiraua Sustainable Development Reserve, in Central Amazon floodplain, Amazonas, Brazil. We analysed surface temperature, conductivity, pH, dissolved oxygen, turbidity, transparency, suspended inorganic and organic matter, chlorophyll-a, pheophytin, total nitrogen, total phosphorus, organic and inorganic carbon in 2009 high water phase, 2009 and 2010 low water phases. Multivariate statistical analyses of 24 aquatic systems (6 ressacas, 12 lakes and 6 channels, 142 samples) were applied to the variables in order to: 1) quantify differences among aquatic system types; 2) assess how those differences are affected in the different phases of the hydrological year. First, we analysed the entire set of variables to test for differences among phases of the hydrological year and types of aquatic systems using a PERMANOVA two-way crossed design. The results showed that the all measured limnological variables are distinct regarding both factors: types of aquatic systems and hydrological phases. In general, the magnitude and amplitude of all variables were higher in the low water phase than in the high water phase, except for water transparency in all aquatic system's types. PERMANOVA showed that the differences between aquatic system's types and hydrological phases of all variables were highly significant for both main factors (type and phase) and for the type x phase interaction. Limnological patterns of Amazon floodplain aquatic systems are highly dynamic, dependent on the surrounding environment, flood pulse, main river input and system type. These patterns show how undisturbed systems respond to natural variability in such a diverse environment, and how distinct are those aquatic systems, especially during the low water phase. Aquatic systems in Mamiraua floodplain represent limnological patterns of almost undisturbed areas and can be used as future reference for comparison with disturbed areas, such as those of the Lower Amazon, and as a baseline for studies on the effects of anthropogenic influences and climate change and on Amazon aquatic ecosystem. (AU)

• Processo FAPESP: 08/07537-1 - Integração de dados multi-sensores, telemétricos, censitários e de campo na avaliação do impacto humano sobre os sistemas aquáticos da várzea do rio Amazonas/Solimões
• Beneficiário: Evlyn Márcia Leão de Moraes Novo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/06661-0 - Estudo da relação entre parâmetros ambientais e a variação da abundância de pirarucu nos lagos de várzea na Reserva de Desenvolvimento Sustentável Mamirauá: uma análise multi-sensor para o manejo comunitário da pesca
• Beneficiário: Adriana Gomes Affonso
• Modalidade de apoio: Bolsas no Brasil - Doutorado