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Murcia Riaño, Magnolia and Giraldo López, Alan. (2007). Oceanographic conditions and mesozooplankton composition in the oceanic zone of Colombian pacific, during september - october 2004. Boletín Científico CCCP (14). pp. 83-94. doi https://doi.org/10.26640/01213423.14.83_94

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Abstract

Taxonomic composition of mesozooplancton and spatial variability of physical – chemical and biological conditions in the oceanic zone of the Colombian Pacific Ocean were studied during September-October 2004 on board of B.O. ARC Providencia. 21 oceanographic stations were sampled, and only in 12 of them zooplankton haulages were carried out. Zooplankton was collected by oblique haulages of Bongo Net, from 200m to surface. Vertical variation of temperature (T) and Salinity (S) was recorded with CTD Seabird-19. Samplings of water from standard depths (0, 10, 20, 30, 50, 75, 100 and 150 m) were carried out using a Niskin bottle in order to quantify the concentration of dissolved oxygen (OD) and the concentration of Chlorophyll-a (Chlo-a). The depth of frictional influence layer or mixed layer (ML) in the study zone was defined at 31.20±5.2 m, being the mean oceanographic conditions of water column, TCM=26.8±0.3 °C, SCM=32.9±0.4, OD=4.57±0.1ml l-1 and Clo-a CM=0.50±0.1mg Chlo-a m-3. 25 taxonomic groups of zooplankton were identified, copépods representing 71% of the total of organisms, followed by Chaetognaths (6%), Siphonóphors (6%), Apendicularians (5%), and Ostrácods and Foraminífera (2%). The abundance of the mesozooplankton was between 79458 – 19962 Ind 100m-3, while the biomass was between 5.20 and 21.70 g 100m-3. A positive correlation between abundance (r=0.62, p=0.034) and biomass (r=0.61, p=0.034) of mesozooplanktonic organisms with chlo-a concentration in the surface layer of water column (0 – 50m) was detected. Moreover, the zooplankton biomass (r=0.65, p=0.023) was significantly correlated with the concentration of chlo-a in the frictional influence layer of the Colombian Pacific Ocean.

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Item Type:	Article
Uncontrolled Keywords:	Mesozoopláncton. Estructura comunitaria. Biomasa. Parámetros fisicoquímicos. Pacífico colombiano. Ecología pelágica.
Geographical coverage :	Pacífico colombiano
Depositing User:	Dirección General Marítima
ISSN:	0121-3423
Official URL:	http://www.cccp.org.co
Identification Number:	https://doi.org/10.26640/01213423.14.83_94

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