Dominance of small-sized phytoplankton in a Mediterranean eutrophic coastal lagoon

The predator-prey relationship is generally size-specific in the pelagic food webs. Phytoplankton cell size structure can provide information on the successive levels of consumers and therefore on the energy that can flow towards the top consumers. This work focuses on phytoplankton cell size structure in a coastal lagoon (Cabras Lagoon, Italy) considered one of the most important for fishing productivity in the Mediterranean. The inter-annual and seasonal dynamics of picophytoplankton (Pico, cell size 3 μm) were considered during almost three years in relation to the temporal dynamics of selected environmental variables and zooplankton. Small-sized cells with a mean linear cell size <10 μm and a mean cell volume <103 μm3 mainly represented UFP along the entire study period. This size class contributed the most to total phytoplankton biomass (up to 86%) and density (up to 99%) during the first part of the investigation period. A compositional change was detected: smaller species of Chlorophyceae, Bacillariophyceae, filamentous Cyanophyceae, and autotrophic nanoflagellates thrived in the second part of the study, replacing larger Mediophyceae that dominated UFP at the beginning. Picocyanobacteria rich in phycocyanin were the dominant taxa of Pico along the entire investigation period and this size class contributed the most to total phytoplankton biomass (up to 30%) and density (up to 96%) at the end of the study. The observed shift towards different and even smaller UFP and Pico in the second part of the study was most probably due to complex interactions between top-down and bottom-up effects. Indeed, an increased temperature, a decreased salinity and decreased concentrations of nutrients (mainly ammonium and orthophosphate), as well as an increased grazing pressure of rotifers on the larger Mediophyceae were simultaneous with the changes detected in phytoplankton. The obtained results highlight a longer planktonic trophic web in Cabras Lagoon that includes small phytoplankton at the base, ciliates, rotifers, and copepods. This suggests low energy availability for planktivorous fish, with possible future relevant consequences for fishing activities in this coastal lagoon.

Datos y Recursos

Cite como

Pulina S. Satta C.T. Padedda B.M. Culurgioni J. Diciotti R. Fois N. y Lugliè A. Dominance of small-sized phytoplankton in a Mediterranean eutrophic coastal lagoon. Page Press, 2023. https://doi.org/10.4081/aiol.2023.11112

Clipboard Icon
Recuperado: 21 Jan 2025 14:25:00
RIS BibTeX

Metadatos
Descargar
DCAT-AP/NTI-RISP

Información básica
Tipo de recurso Artículo
Fecha de creación 05-11-2024
Fecha de última modificación 21-01-2025
Mostrar histórico de cambios
Identificador de los metadatos 6db952af-243b-5fc1-87e7-7b86ac6ad5af
Idioma de los metadatos Español
Temáticas (NTI-RISP)
Categoría del conjunto de alto valor (HVD) Observación de la Tierra y medio ambiente
Categoría temática ISO 19115 biota
URI de palabras clave
Información bibliográfica
Nombre del autor Pulina, S., Satta, C.T., Padedda, B.M., Culurgioni, J., Diciotti, R., Fois, N. y Lugliè, A.
Nombre del editor Page Press
Identificador alternativo DOI: 10.4081/aiol.2023.11112
Identificador del autor
Email del autor
Web del autor
Procedencia
Declaración de linaje
Perfil de Metadatos
Notas sobre la versión
Versión