La comunidad fitoplánctica de Punta Morales, Golfo de Nicoya, Costa Rica / The phytoplankton community of Punta Morales, Nicoya Gulf, Costa Rica
Rev. biol. trop
;
49(Supl.2): 11-17, dic. 2001. tab
Artículo
en Español
| LILACS
| ID: lil-502410
ABSTRACT
Three daily samplings of the phytoplankton community were made at two consecutive days in March, April, May, September, October, November and December 1997, at Punta Morales, Golfo de Nicoya, Costa Rica. Samples were collected during each tide at depths of 50% and 10% of light penetration using a Niskin bottle. A total of 43 taxa were identified. Centric diatoms, pennates and flagellates represented 90% of total phytoplankton abundance. In the phytoplankton fraction (cells > 30 microm), diatoms were the most abundant group, and Skeletonema costatum (32%) dominated. In nannophytoplankton (cells < 30 microm), Chaetoceros (23.7%) was the most abundant taxon, followed by flagellates (23%) and Cylindrotheca closterium (13.1%). These results agree with previous surveys and suggest that a typical net phytoplankton community persist through time in the Punta Morales zone. The number of nannophytoplankton fraction cells varied seasonally and suggests quantitative changes in species abundance, with possible modifications of cellular size or chain length in filamentous species. The codominance between S. costatum and Chaetoceros spp. during the rainy season suggested the ocurrence of an early ecological sucession, and nutrients could be the factor generating such population changes.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Fitoplancton
Tipo de estudio:
Estudio pronóstico
Límite:
Animales
País/Región como asunto:
America Central
/
Costa Rica
Idioma:
Español
Revista:
Rev. biol. trop
Asunto de la revista:
Biologia
/
Medicina Tropical
Año:
2001
Tipo del documento:
Artículo
País de afiliación:
Costa Rica
Institución/País de afiliación:
Universidad de Costa Rica/CR
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