Land-Ocean Connectivity Through Subsidies of Terrestrially Derived Organic Matter to a Nearshore Marine Consumer

Autor(es)

Gorman, Daniel ^{[1, 2]} ; Pucci, Marinella ^[1] ; Soares, Lucy S. H. ^[1] ; Turra, Alexander ^[1] ; Schlacher, Thomas A. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Ctr Marine Biol CEBIMar, Sao Sebastiao - Brazil

^[3] Univ Sunshine Coast, Sch Sci & Engn, Sunshine Coast, Qld - Australia

• Tipo de documento: Artigo Científico
• Fonte: ECOSYSTEMS; v. 22, n. 4, p. 796-804, JUN 2019.
• Citações Web of Science: 0

Resumo

Land-ocean coupling in the form of riverine inputs of terrestrial matter can constitute an energetic subsidy to food webs in nearshore coastal areas. In regions with distinctly seasonal rainfall patterns, the strength and spatial footprint of any terrestrial signal in receiving marine food webs is predicted to mirror seasonal changes in fluvial forcing. Here, we test this prediction in a subtropical bay by isotopically (C-13 and N-15) characterizing the main primary producers and reconstructing (using a Bayesian stable isotope mixing model) their contributions to the diet of thinstripe hermit crabs (Clibanarius vittatus). Seasonal rainfall flushed terrestrial carbon out of coastal watersheds, and this material made a sizable (up to 28%) contribution to the diet of marine consumers, in addition to mangroves, seagrass and algae. Our isotope model indicates that inputs of terrestrial grasses and other littoral vegetation were 15% greater as a result of increased fluvial forcing. In addition, the spatial footprint of the terrestrial signal in marine consumers propagated more widely throughout the bay during high-rainfall periods. Given the widespread conversion of natural watershed habitats for agriculture and urban development, understanding the nature, temporal dynamics and strength of such land-ocean coupling will become increasingly important. (AU)

• Processo FAPESP: 11/50317-5 - Biodiversidade e funcionamento de um ecossistema costeiro subtropical: subsídios para gestão integrada
• Beneficiário: Antonia Cecília Zacagnini Amaral
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 13/07576-5 - Ecologia populacional de invertebrados bentônicos na baía do Araçá, Litoral Norte do Estado de São Paulo
• Beneficiário: Daniel Gorman
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/09937-2 - Interações tróficas da comunidade do sistema sublitoral da Baía do Araçá, município de São Sebastião (SP): uma abordagem pelo uso de isótopos estáveis
• Beneficiário: Marinella Coutinho Jacinto Pucci
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 18/06162-6 - Avaliação do potencial atual e futuro das áreas marinhas protegidas (AMPs) para preservação da biodiversidade, da função e da resiliência das marinhas rochosas subtidais no Brasil subtropical
• Beneficiário: Daniel Gorman
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores