Assess and analyze the characteristics of marine lifestyles (planktonic, nektonic, benthic, interstitial), marine communities, and their biota.

Assess and analyze the characteristics of marine lifestyles (planktonic, nektonic, benthic, interstitial), marine communities, and their biota.

Task – Distribution of Life
Introduction
Some of the strangest creatures on Earth live on the ocean. The seafloor is an eerie world that time forgot.Tall chimneys erupt hot, mineral-rich water that supports a variety of unusual organisms in the cold, dark abyss.These unusual organisms have no counterparts anywhere else in the sea.

Today, the world ocean is home both to the largest animal that has ever lived (wanna guess what it is?) and to many of Earth’s smallest organisms. Cyanobacteria, a blue-green algae, grow in the surface waters. Several hundred could fit comfortably on the point of a needle. Marine biologists estimate that there are at least nine million species of unicelluar organims, plants, and animals living in the oceans. As of now they have identified only about 1,000,000 of them.

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Objectives
Assess and analyze the characteristics of marine lifestyles (planktonic, nektonic, benthic, interstitial), marine communities, and their biota.
Assess marine environmental zones and list characteristics of each zone.
Investigate the relationship between productivity, net productivity and respiration.
Explore the physical factors that control the distribution of marine life.
The Captain’s Orders
The oceans may be divided into large biomes, or living regions (Figure 1). These zones are based on the distribution of marine organisms. The two major environments are the pelagic, which consists of the water column, and the benthic, which comprises the ocean bottom. The organisms that live in these zones can be classified in terms of the habitat they occupy.

Figure 1. Classification of life zones in the oceans.

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