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Andrea Gori Sergio Rossi Cristina Linares Elisa Berganzo Covadonga Orejas Mark RT Dale Josep-Maria Gili 《Marine Biology》2011,158(8):1721-1732
In the Western Mediterranean Sea, the gorgonian Eunicella singularis (Esper, 1794) is found at high densities on sublittoral bottoms at depths from 10 to 70 m. Shallow colonies have symbiotic
zooxanthellae that deeper colonies lack. While knowledge of the ecology of the shallow populations has increased during the
last decades, there is almost no information on the ecology of the deep sublittoral populations. In October and November 2004
at Cap de Creus (42°19′12″ N; 03°19′34″ E), an analysis of video transects made by a remotely operated vehicle showed that
shallow populations (10–25 m depth) were dominated by small, non-reproductive colonies, while deep sublittoral populations
(50–67 m depth) were dominated by medium-sized colonies. Average and maximum colony heights were greater in the deeper populations,
with these deeper populations also forming larger patch sizes and more extensive regions of continuous substrate coverage.
These results suggest that shallow habitats are suitable for E. singularis, as shown by the high recruitment rate, but perturbations may limit or delay the development of these populations into a
mature stage. This contrasts with the deep sublittoral habitats where higher environmental stability may allow the development
of mature populations dominated by larger, sexually mature colonies. 相似文献
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Environmental Management - The population in the American West has been increasing at a rapid rate and is predicted to continue growing. As a result, the availability, use, and allocation of water... 相似文献
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We examined the effect that value orientation to forests and wildland fire management has on an individual’s decision to create
defensible space around his or her residence in the wildland–urban interface. Using data from a mail-back questionnaire, respondents
in north central Minnesota were clustered by basic value–laden beliefs toward forest and wildland fire management and compared
across a number of perceptions and behaviors related to creating defensible space around residences. Value orientation groups
differed in attitudes, subjective norms, and perceived behavior control toward creating defensible space. In addition, relative
effects of these perceptions on intention to create defensible space differed across groups. Implications lie in (a) understanding
differences in motivations and reasons for support of strategies for managing fires near the wildland–urban interface, (b)
developing information designed to address the perspectives of different groups related to creating defensible space, and
(c) contributing to an improved integration of land management and public concerns and interests. 相似文献
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