Реферат: Predators And Ecosystem Management Essay Research Paper

Predators And Ecosystem Management Essay, Research Paper

Predators and Ecosystem Management

Natural Resources Management

01/29/97

Predators have an everlasting effect on different kinds of ecosystems.

They influence there ecosystems by controlling the abundance of lower species

certain habitats. In this article, ?Predators and Ecosystem Management? by

(James A. Estes). He explains results of case studies that indicate important

ecological roles for predators in a huge coastal ecosystem. The main challenge

in this article is to determine if there are recurrent patterns else where in

nature and to also understand when and where they occur.

The author gives his perspective on predators and the coastal ecosystems

by giving us a living example, the sea otter and the kelp forests. The relation

between the sea otters and the kelp-forests was provided because of a accident

of history, the over-exploitation of sea otters in the Pacific maritime fur

trade. The study compared areas where sea otters were abundant with nearby

areas to area’s where they’re almost extinct. By doing this comparison of the

sea otters coastal system it was possible to gain much insight into the sea

otter ecological role in kelp-forest ecosystem. Over the years it’s been

possible for us to observe the kelp-forest ecosystem over-time, thanks to the

massive growth of the sea otters population we observed the change from otter-

free to otter-dominated.

This article relates to many aspects of our textbook. On page 89 in

chapter 5 the text explains what an ecosystem is, defined by the book, it’s a

community of species interacting with one another where there is a non-living

environment. In this case the otter and kelp-forests ecosystems a coastal

ecosystem. As mentioned in the book, the food chain is involved in the sequence

of events with the organism that are the source of the food. In a survey of

coastal habitats in many areas of the North Pacific Ocean have revealed that

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