Factoring scales of spatial and temporal variation in fish abundance in a subtropical estuary

Marine Ecology Progress Series

,, J. P. Vieira¹  L. E. Moraes¹  A. M. Garcia¹  K. O. Winemiller¹  E. T. Paes¹ 

关键词: Time-series analyses;    Partitioning variation;    Estuarine-dependent species;    Mullet ;    Whitemouth croaker;    Argentine menhaden;    Patos Lagoon estuary;    Brazilian-LTER;   

DOI  :  10.3354/meps09798

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: We employed a new approach linking multivariate and time series analyses to identify common versus unique spatiotemporal components of abundance variation of marine spawning fishes recruiting into a subtropical Western Atlantic estuary. Based on a 10 yr standardized monthly data set, we also investigated patterns of association for local and regional factors with annual and inter-annual variation in abundance of 5 dominant marine estuarine-dependent fishes. The total amount of variation in fish abundance explained by environmental variables was 22.4%. After factoring out shared spatiotemporal variation (0.8%), our analysis showed that temporal components had an almost 5-fold greater contribution (28.0%) than spatial components (6.4%) in explaining the variation in abundance of the 5 species. Most of the variation across the temporal scale (58.5%) was associated with annual (from 0.5 to 1.3 yr) rather than multi-year oscillations (>2 yr). Such annual patterns were probably associated with adaptations of marine estuarine-dependent fishes for exploiting predictable pulses in seasonal productivity typically found in subtropical estuaries. In contrast, inter-annual variation in abundance occurring at a scale of 3 to 7 yr could be attributed to rainfall anomalies associated with El Niño Southern Oscillation (ENSO) events, whereas those occurring at a scale of 2 yr could be influenced by the Southern Annular Mode (SAM). Our findings corroborate the hypothesis that prevalent annual patterns of variation in the abundance of marine estuarine-dependent fishes are associated with predictable productivity pulses linked to the annual temperature regime, whereas inter-annual variations in fish abundance are associated with the influence of large-scale climatic phenomena.

【 授权许可】

Unknown