Marine Biology: An Ecological Approach
Appropriate for undergraduate majors and graduate students in marine biology and marine ecology, Marine Biology: An Ecological Approach emphasizes the ecological principles that govern marine life throughout all environments within the world's oceans. Its unique ecological approach adds real-world relevance by exploring how organisms interact within their individual ecosystems. The text is organized by habitat and each habitat receives detailed, in-depth coverage, giving instructors flexibility to focus on their particular areas of interest. The Fifth Edition is fully updated with the latest research data and topics, including expanded coverage of the human impact on oceans, oceanic dead zones, and coral reefs. In addition to Nybakken's engaging writing style, the text now offers enhanced pedagogy with new end-of-chapter summaries, a new four-color design to complement the art program, an art CD-ROM for instructors, and a text specific Companion Web site.
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The key species was again the urchin Strongylocentrotus droebachiensis. The
shallower-dwelling kelps were prevented from moving deeper by grazing by the
sea urchins, thus maintaining the integrity of the mussel bed. Storm-generated ...
This resulted in a drastic reduction of the drift kelp used as food by the urchins
Strongylocentrotus purpuratus and S. franciscanus. The urchins then emerged
from their sheltered cracks and crevices and, in the absence of effective
This difference was because the urchins had significant annual recruitment and
growth in the Aleutians, whereas in southeastern Alaska urchin recruitment was
episodic, with years separating recruitment pulses. The rapid return of urchins in
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H A P T E R
SOME ECOLOGICAL PRINCIPLES
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