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Altogether, the pelagic zone occupies 1,330 million km 3 (320 million mi 3) with a mean depth of 3.68 km (2.29 mi) and maximum depth of 11 km (6.8 mi). [2] [3] [4] Pelagic life decreases as depth increases. The pelagic zone contrasts with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the ...
A new type of monitoring involves quantifying differing groups of organisms (macroinvertebrates, macrophytes and fish) and measuring the stream conditions associated with them. [ 6 ] Threats to freshwater biodiversity include overexploitation , water pollution , flow modification, destruction or degradation of habitat , and invasion by exotic ...
A tropical moist broadleaf forest in Central America, for example, may be similar to one in New Guinea in its vegetation type and structure, climate, soils, etc., but these forests are inhabited by animals, fungi, micro-organisms and plants with very different evolutionary histories.
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The mesopelagic zone has some unique acoustic features. The Sound Fixing and Ranging (SOFAR) channel, where sound travels the slowest due to salinity and temperature variations, is located at the base of the mesopelagic zone at about 600–1,200m. [6] It is a wave-guided zone where sound waves refract within the layer and propagate long ...
Habitat loss at the edges of the pelagic zone is thought to create a loss of native pelagic fish species, by increasing vulnerability to predation. The intertidal and benthic estuary is presently dominated by mudflats that are largely the result of sedimentation derived from gold mining in the Sierra Nevada in the late 19th century.
The ability to track vegetation change through time and space to make predictions about vegetation change are some of the many possibilities of GIS. Accurate maps of the aquatic plant distribution within an aquatic ecosystem are an essential part resource management. It is possible to predict the possible occurrences of aquatic vegetation.
v2. The first version used a linear gradient, which didn't look correct (the epi was to dark, and the bathy too light). This new version uses a nonlinear gradient (where the brightness falls off logarithmically) which is much closer to reality. I also improved the waves on the ocean surface. v3. No raster images anymore, gradient for earth.