View Full Document

Study Notes



View the full content.
View Full Document
View Full Document

2 views

Unformatted text preview:

Preliminary investigation of the effects of some limnological parameters on vertical horizontal and temporal changes in ash free biomass of pelagic plankton Student Kevin Fingerman Mentor Pierre Denis Plisnier Introduction The food web of Lake Tanganyika as in all ecosystems has its base in its primary producers and their primary consumers This means that the spectacularly diverse organisms in this lake as well as the human populations that inhabit the top of the food chain are dependent upon the plankton in its waters for their survival The term plankton refers to the small organisms ranging from a few micrometers up to 2mm in length which inhabit the water columns of aquatic ecosystems Phytoplankton are microscopic plants gaining their energy through photosynthesis They are the primary producers of most aquatic ecosystems In contrast the other major class of plankton zooplankton consume other organisms in order to gain the energy needed for life Together these two types of microorganisms form the lower levels of the aquatic food web The phytoplankton which are the primary producers are eaten by zooplankton which in turn are eaten by small fish The main predators of the pelagic zooplankton stock in Lake Tanganyika are the two endemic clupeid species Limnothrissa miodon and Stolothrissa tanganicae These two species account for a large proportion of the catch of fisheries on the lake as well as being the primary food source for the larger fish such as Lates stappersi which make up the other large segment of the catch With this study I ve attempted to correlate vertical horizontal and temporal differences in plankton ashfree biomass to differences in the physical and chemical environments the plankton have encountered The limiting factor or factors for the size and reproduction rate of a given population in a given environment can often be hard to pinpoint This is because ecosystems are complex and rather than any one limiting factor populations are often controlled



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Study Notes and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Study Notes and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?