MARINE BIOLOGY
11th Edition
ISBN: 9781259880032
Author: CASTRO
Publisher: RENT MCG
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Chapter 15, Problem 1CT
Summary Introduction
To explain: The mechanisms that might allow a species to maintain its characteristic distribution.
Introduction: There are three main ecological categories of organisms present in both fresh water and marine ecosystems. These are plankton, nekton, and benthos. The organisms that actively float on water are known as plankton. For example, fish, crabs, and sea stars.
Expert Solution & Answer
Explanation of Solution
The mechanisms that might allow a species to maintain its characteristic distribution are as follows:
- The physical and chemical characteristics of water masses, such as temperature, nutrients, and salinity limit the horizontal or geographic distribution of plankton.
- Gyre systems do not mix with surrounding masses. However, it shows little mixing with surrounding masses. In these masses and other masses, planktons are uniformly distributed.
- Biotic factors such as limitations of food and predation may influence the patchy pattern of distribution.
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Chapter 15 Solutions
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- With respect to planktonic communities in the ocean, which ONE of the following statements is correct? a. Population numbers of plankton species vary over time, but in particular places are consistent b. Population numbers of plankton species are consistent over time, but vary from place to place c. The diversity of planktonic communities is constantly changing, and dominance by any one group is always correlated with one or more environmental factors d. The diversity of planktonic communities is stable over time, and no one group ever achieves dominance e. The diversity of planktonic communities is constantly changing, and dominance by any one group is not correlated with any environmental factorarrow_forwardWhat is the term for the accumulation of dead planktonic organisms that have sunk through the water column?arrow_forwardRed algae are considered an important keystone species in the marine environment. Explain why.arrow_forward
- What is it called when organisms buried in the sediment use special structures to filter plankton from the clear water above? Give an example of an organisms like this mentioned in the text.arrow_forwardWhy can’t marine organisms use the nitrogen gas dissolved in seawater?arrow_forwardMany organisms living in estuaries experience freshwater and saltwater conditions each day with the rising and falling of tides. Explain how these changing conditions challenge the survival of these organismsarrow_forward
- What organisms living in salty area are called?arrow_forwardDuring the summer of 2015 a harmful algal bloom took place off thecoast of Central California. In the weeks and months that followed,officials banned the sale of clams, oysters, and crabs, and several sealions in the area were found sick or dead. How do these events relateto one another?arrow_forwardWhy is shark finning used in shark fin soup can lead to the destruction of the coral reef system?arrow_forward
- Question. Benthic communities have much more diverse populations of species than open-water pelagic communities, but benthic communities are also more geographically limited in area. Why might this be so?arrow_forwardWhat happened to the sea floor algae and plants? If fewer organisms are eating them, shouldn’t their numbers have increased? Why are they rare now?arrow_forwardWhat would happened to the other species in the marine ecosystem if kelp was decreasing?arrow_forward
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