Keywords
abundancia
distribución vertical
Golfo Dulce
El Niño
Pacífico Tropical Oriental
Costa Rica
zooplankton
abundance
vertical distribution
Golfo Dulce
El Niño
eastern Tropical Pacific
Costa Rica
How to Cite
Abstract
The possible effect of “El Niño” in the non-gelatinous zooplankton in Golfo Dulce, Pacific coast of Costa Rica during the period of 1997-1998. Non-gelatinous zooplankton was studied in Golfo Dulce, an embayment on the Pacific coast of Costa Rica, during the period 1997-1998. Five sampling stations were selected, representing different areas of the gulf. Previous to each zooplankton sampling, a 2 L Niskin bottle was used to collect water and determine water temperature, salinity, and dissolved oxygen throughout the water column at intervals of 10 m from the surface to a depth of 60-100 m. Temperature variation in the water column was used to locate the thermocline. A conical zooplankton net of 0.50 m in diameter and 153 μm mesh size, with a remote closing device in its mouth was used. Sampling included a vertical haul above the thermocline, one through it, and one below it at each station. Samples were fixed in 4 % formaldehyde. Later, a fraction was separated using a Folsom plankton splitter. In average, zooplankton abundance was 3 793 ± 4 867 ind/m3, with a significantly higher abundance in the upper layer of all stations (F= 66.7, p <0.05). The station with the highest abundance in the upper layer was GD-03 (n= 9 921 ±8 334 ind/m3). The mid layer showed relatively low densities, ranging between 1 585 ± 759 ind/m3 and 2 626 ± 3 102 ind/m3. The deep layer was relatively poor in zooplankton, with values that varied between 946 ± 1 069 ind/m3 and 1 307 ± 1 270 ind/m3. In general, the most abundant group during the study period was the copepods (71.47 %), followed by appendicularians (8.25 %), ostracods (7.99 %), invertebrate eggs (5.43 %), polychaete larvae (1.8 %), and chaetognaths (1.03 %). Cluster analysis indicated that the inner stations behaved differently from outer stations. The possible impact of the El Niño on the distribution, composition and abundance of the non-gelatinous zooplankton is discussed. Rev. Biol. Trop. 54 (Suppl. 1): 225-240. Epub 2006 Sept. 30.References
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