NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.37 [2008] >
IJMS Vol.37(3) [September 2008] >


Title: Effect of dredging on benthic-pelagic production in the mouth of Cross River Estuary (off the Gulf of Guinea), S. E. Nigeria
Authors: Ewa-Oboho, I.
Oladimeji, O.
Asuquo, F. Emile
Keywords: Benthic-pelagic production
Dredging
Detritus
Phytoplankton
Cross River Estuary
Nigeria
Issue Date: Sep-2008
Publisher: CSIR
Abstract: The effect of high turbidity on benthic-pelagic production at the mouth of Cross River Estuary (South Eastern Nigeria) was investigated following the dredging of the river channel in 1998. Annual phytoplankton production in the estuary was higher (25.9g C/m²/yr) before dredging than after (20.7g C/m²/yr). The seasonal distribution of chlorophyll-a correlated positively with that of primary production before (r = 0.82, P<0.001) and after dredging (r = 0.65, p <0.001). Primary production values were higher in the rainy season than in the dry season. Reduction in chlorophyll-a concentration (primary production) shortly after dredging, could be attributed to the significant reduction in light penetration, the physical smothering of benthic algae and disruption of benthic habitats. The patterns of seasonal copepod densities closely paralleled that of algal biomass. The efficiency of energy transfer from primary production to copepod production was lower after dredging (8%) than before (15%). Copepod grazing rates were high and greater on larger phytoplankton species which had < 10 % of algal carbon needed for secondary production.
Page(s): 291-297
ISSN: 0379-5136
Source:IJMS Vol.37(3) [September 2008]

Files in This Item:

File Description SizeFormat
IJMS 37(3) 291-297.pdf453.57 kBAdobe PDFView/Open
 Current Page Visits: 778 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 603837 since 06-Feb-2009  Last updated on 21-Oct-2014Webmaster: nopr@niscair.res.in