Full stomachs at empty tides: tidal cycle affects feeding activity and diet of the sandy beach gastropod Olivella minuta

Autor(es)

Checon, Helio H. ^{[1, 2]} ; Silva, Mariana O. ^{[1, 3]} ; Corte, Guilherme N. ^{[1, 2]} ; Yokoyama, Leonardo Q. ^[4] ; Teodosio, M. Alexandra ^[3] ; Turra, Alexander ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, Praca Oceanog 191, BR-05508120 Sao Paulo - Brazil

^[2] Univ Esladual Campinas, Dept Biol Anim, Rua Monteiro Lobato 255, BR-13083862 Campinas, SP - Brazil

^[3] Univ Algarve, FCT, CCMAR, Campus Gambelas, P-8005139 Faro - Portugal

^[4] Univ Fed Sao Paulo, Lab Ecol & Gestao Costeira, Inst Mar, Rua Carvalho de Mendonca 144, BR-14411070 Santos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Molluscan Studies; v. 86, n. 3, p. 219-227, AUG 2020.
• Citações Web of Science: 1

Resumo

Olivella minuta is an abundant neogastropod on sandy beaches from Texas (USA) to southern Brazil. This study aimed to characterize and compare the feeding activity and diet of a Brazilian population of O. minuta in different tidal zones (intertidal and subtidall, and different tidal levels (high and low tides), with three combinations of tidal zone and level being studied (intertidal during low tide, intertidal during high tide and subtidal). The results showed that diet composition was generally similar among tidal conditions, with O. minuta being a generalist, feeding on 45 different food items. Feeding activity, however, was higher in the intertidal during low tide, whereas the richness and diversity of food items were higher in the intertidal during high tide. The higher feeding activity of O. minuta during low tide may be linked to a lower risk of predation; at low tide organisms may be able to feed for a longer time, arid this may be particularly true on beaches with fine sand, where water retention is higher than that on beaches with coarse sand. The higher diversity of food items consumed in the intertidal during high tide is likely related to the increased prevalence of planktonic food during high tide. Our results indicate that tidal zone and level may strongly influence the feeding activity of coastal soft-bottom species and that species may show higher feeding activity during low tide. Given the current loss of intertidal habitats due to anthropogenic activity and climate-change associated factors, our study has important implications, highlighting the importance of intertidal areas for the ecology and conservation of sandy beach species. (AU)

• Processo FAPESP: 18/22036-0 - Avaliação do potencial de diferentes índices bentônicos para determiner a integridade ecólogica de praias arenosas: subsídios para práticas de manejo e monitoramento
• Beneficiário: Hélio Hermínio Checon
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 09/15893-5 - Variabilidade interpopulacional em praias arenosas: estudo de caso sobre a zonação, reprodução e crescimento de Olivella minuta (Gastropoda, Olividae)
• Beneficiário: Leonardo Querobim Yokoyama
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 09/17585-6 - Ecologia populacional de Olivella minuta (Link, 1807) (Gastropoda, Olividae) na zona entremarés das praias do Araçá e de Barequeçaba, Litoral Norte do Estado de São Paulo
• Beneficiário: Alexander Turra
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/17071-9 - Preservando praias arenosas: biodiversidade, bens e serviços e impactos em um ecossistema negligenciado
• Beneficiário: Guilherme Nascimento Corte
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado