Abundance distribution and species composition of cyclopoid copepods along a transect traversing the upwelling zone off Northern Zamboanga Peninsula Philippines

Campos Wilfredo Lopez, . and Jaspe Beverly Tudence, . and Metillo Ephrime, . Abundance distribution and species composition of cyclopoid copepods along a transect traversing the upwelling zone off Northern Zamboanga Peninsula Philippines. pp. 307-314. ISSN 0116-6514

The abundance distribution and species composition of cyclopoids were studied in the largest sardine fishing ground in the Philippines during a coastal upwelling event in March 2014. Zooplankton samples were collected in six stations along a transect extending from the coast to about 50 km offshore in Dipolog Bay Northern Zamboanga Peninsula Mindanao. A 100 m NORPAC net was hauled vertically to sample successive depth strata (0“65 m 65“135 m 135“200m). Out of 28 zooplankton groups cyclopoids made up 12.2 of mean total zooplankton density. Forty-two cyclopoid species (overall mean density: 503.6 ind.m-) were identified with Oncaea clevei Frchtl 1923 (25.4 ) as the most abundant followed by Oncaea scottodicarloi Heron and Bradford-Grieve 1995 (13.6 ) Triconia conifera (Giesbrecht 1891) (9.2 ) Oncaea media Giesbrecht 1891 (7.2 ) and Corycaeus dahli Tanaka 1957 (7.0 ). The higher abundance (732.9 ind.m-) of cyclopoids at 0“65 m than at 135“200 m (220.2 ind.m- ) was attributed to the high abundance of phytoplankton in the upper euphotic zone. Cyclopoid density was highest in station 4 (938.3 ind.m-) at the margin of the upwelling zone. This is attributed to the time lag between phytoplankton and zooplankton build-up and the dispersive effects of wind-driven drift.

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Abstract

The abundance distribution and species composition of cyclopoids were studied in the largest sardine fishing ground in the Philippines during a coastal upwelling event in March 2014. Zooplankton samples were collected in six stations along a transect extending from the coast to about 50 km offshore in Dipolog Bay Northern Zamboanga Peninsula Mindanao. A 100 m NORPAC net was hauled vertically to sample successive depth strata (0“65 m 65“135 m 135“200m). Out of 28 zooplankton groups cyclopoids made up 12.2 of mean total zooplankton density. Forty-two cyclopoid species (overall mean density: 503.6 ind.m-) were identified with Oncaea clevei Frchtl 1923 (25.4 ) as the most abundant followed by Oncaea scottodicarloi Heron and Bradford-Grieve 1995 (13.6 ) Triconia conifera (Giesbrecht 1891) (9.2 ) Oncaea media Giesbrecht 1891 (7.2 ) and Corycaeus dahli Tanaka 1957 (7.0 ). The higher abundance (732.9 ind.m-) of cyclopoids at 0“65 m than at 135“200 m (220.2 ind.m- ) was attributed to the high abundance of phytoplankton in the upper euphotic zone. Cyclopoid density was highest in station 4 (938.3 ind.m-) at the margin of the upwelling zone. This is attributed to the time lag between phytoplankton and zooplankton build-up and the dispersive effects of wind-driven drift.

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Item Type:	Article
AGROVOC Term:	Copepoda
AGROVOC Term:	Crustaceans
AGROVOC Term:	Zooplankton
AGROVOC Term:	Coastal waters
AGROVOC Term:	Distribution
AGROVOC Term:	Population composition
AGROVOC Term:	Phytoplankton
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9467

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