Tuesday, February 22, 2011

Zooplankton -Calanoid Copepod


Copepods are highly diverse and abundant, resulting in extensive ecological radiation in marine ecosystems.Calanus sinicus dominates continental shelf waters in the northwest Pacific Ocean and plays an important role in the local ecosystem by linking primary production to higher trophic levels. A lack of effective molecular markers has hindered phylogenetic and population genetic studies concerning copepods. As they are genome-level informative, mitochondrial DNA sequences can be used as markers for population genetic studies and phylogenetic studies. Copepods play an important role in the aquatic ecosystem and are highly diverse. They comprise a multitude of taxa including 200 families, 1,650 genera and 11,500 species, although this estimation may represent only 15% of the actual number. Copepods have successfully colonized almost all aquatic regimes and have developed diverse lifestyles.

Name: Calanus Sinicus
Description: Females are about 0.8-1.2mm; Males are about 0.7-1mm. Live in pelagic environment; subtropical climate. Limited free movement by flicking jointed limbs and antennae. Antennae helps to prevent from sinking through the water column. Temperature, hydrodynamics, stratification and seasonal variability are likely to be the main factors contributing to the regulation of diversity.
Moderate temperature convey advantages to copepods living in coastal upwelling zones. Coastal upwelling zones are highly advective environments. Advection and diffusion may control life cycle closure. Upwelling surface waters (the upper 10-30m of the water column are carried offshore by Ekman transport resulting from equator-ward blowing winds, to minimize offshore transport they must spend time below the offshore moving layers, in the deeper shoreward-moving waters.)
Currents/water masses and the species association suggest that the species groups may be used as an environmental indicator to evaluate long-term changes in the marine environment. Hydrogen sulfide, metals in solution, and other chemical compounds escape into the sea water, organisms produce organic matter from the hydrogen sulfide. The organisms glow by a chemical reaction; they emit blue light to prevent them from predators.


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