Skip to main content

Zooplankton community changes in Nhlabane estuary, South Africa, induced by man-made structures and drought

Buy Article:

$55.00 plus tax (Refund Policy)

The Nhlabane estuary and coastal lake system has suffered a number of man-made impacts since 1977, when the lake and estuary were separated by the construction of a barrage. More recent man-made events included the construction of temporary sand walls, mid-way along the estuary, to allow crossing of a mining dredger during 1993. These walls remained in place until 1996, coinciding with a local drought period between 1991 and late 1995, during which time the estuary mouth remained closed. The present study investigates changes in the zooplankton community of Nhlabane estuary between February 1992 and October 1996.

Due to continuous freshwater inputs from groundwater seepage, the then closed estuary soon became fresh. This led to significant changes in the zooplankton community, including the appearance of freshwater taxa such as rotifers, cyclopoids (Mesocyclops sp. and Thermocyclops sp.), freshwater cladocerans and insect larvae, reflecting the freshwater conditions. Most estuarine species became less abundant or were absent two years after mouth closure. The estuarine copepod Pseudodiaptomus hessei was least affected and remained dominant. The copepod Acartia natalensis was absent after the first two sampling sessions and only reappeared after the mouth was breached in August 1995. Other taxa that were adversely affected included the mysid Mesopodopsis africana, and larval stages of polychaetes, decapods and fish. Some meroplankton taxa recovered after the mouth reopened.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: DROUGHT; MAN-MADE IMPACTS; NHLABANE ESTUARY; ZOOPLANKTON COMMUNITY

Document Type: Research Article

Publication date: 2005-01-01

More about this publication?
  • Co-Published by NISC and Taylor & Francis - Subscriber access available here
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more