Skip to main content

Free Content The Gradient of Salinity, its Seasonal Movement, and Ecological Implications for the Lake Izabal—Rio Dulce Ecosystem, Guatemala

Download Article:
 Download
(PDF 689.171875 kb)
 
Profiles of conductivity and temperature were measured along a transect of 42 km along the Rio Dulce from Lake Izabal to Amatique Bay, in the coastal lowlands of Guatemala, Central America. Readings were taken three times during the dry season between March 22-June 13, 1972. It was found that water conductivity along the transect increased as the dry season progressed. Tides, winds, gravitation forces, a low topographic gradient, and low discharge of fresh water at this time of the year are the factors responsible for the upstream movement of high conductivity water. The vertical and horizontal stratification of brackish water disappears with the onset of the wet season. Marine invasions into the lake, and the presence of mature red mangroves (Rhizophora mangle) along the Rio Dulce, are explained in terms of the seasonal appearance of this high conductivity water in the area. Pulses of primary production in the bays and coves surrounding the lake, and the consequent availability of concentrated food sources coincident with the occurrence of seasonal oligohaline waters inside the lake, are discussed as the causal factors for marine invasions in tropical lakes.

3 References.

No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 1974-09-01

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • 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