ADAPTIVE RADIATION IN POLYCHAETA PDF

ideal for examining adaptive radiations in extreme environments. Did dorvilleid northern California and Oregon, dorvilleid polychaetes. Polychaeta is the largest class of phylum Annelida. The following is the discussion of the adaptive diversity of polychaetes, swim near the surface of the sea where the danger of predators and solar radiation is excessive. Phylogeny and Adaptive Radiation, Segmented Worms in The Diversity of On the other hand, polychaetes with well-developed parapodia are generally.

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The beating of these fans produces water current which enters the tube from the anterior end and flows out of the posterior end. Retrieved from ” https: Write adaptive diversity according to Habitat Differentiate between adaptive diversity according to Habitat and nutrition.

Adaptive radiation

Detritus feeders may be of two types. The Hawaiian honeycreepers form a large, highly morphologically diverse species group that began radiating in the early days of the Hawaiian archipelago. Four features can be used to identify an adaptive radiation: This causes the sand to cave in forming a funnel-shaped depression at the surface.

The food particles in this water current are filtered out into the mucous bag formed by ciliated glandular epithelium. Circular muscles of these animals are well developed to assist in locomotion.

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Presented above are the most well-documented examples of modern adaptive radiation, but other examples are known. But polychaetes, such as Arenicola, Glycera, Amphitrite and Terebella spend most of the time in burrows and come out only to capture pray or for ingesting detritus.

These are marine, freely moving animals that crawl on sea bottom. The most famous example of adaptive radiation in plants is quite possibly the Hawaiian silverswordsnamed for alpine desert-dwelling Argyroxiphium species with long, silvery leaves that live for up to 20 years before growing a single flowering stalk and then dying. Today represented by approximately 15 species, Darwin’s finches are Galapagos endemics famously adapted for a specialized feeding behavior although one species, the Cocos finch Pinaroloxias inornatais not found in the Galapagos but on the island of Cocos south of Costa Rica.

Locomotory organs or parapodia bear setae which can be retracted and protruded out in various directions for crawling among rocks and stones.

University of California Press. Retrieved June 3, Some have large eyes while others have none. The mechanism by which the finches initially diversified is still an area of active research.

Radaition use of et al. Describe the Modes of life of Polychaetes. The cichlids of Lake Malawi constitute a “species flock” of up to endemic species. Most of the sedentary and tubicolous polychaetes are filter feeders.

Adaptive radiation – Wikipedia

Chaetopterus, Platynereis Calcareous tubes- These tubes are made up of calcium. Histriobdella lives as ectoparasite in the gill chamber of crustaceans and sucks blood. Direct deposit feeders- Some of the polychaetes obtain their food by directly swallowing sand and mud as they burrow through it. This Site can be best viewed in Mozilla or Internet Explorer. Body segments are generally similar Ex: The organic matter contained in the sand and mud axaptive digested while the sand itself is egested as castings.

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Radides are used in food collection. Crawling polychaetes belong to order Errantia which includes marine, freely moving animals that crawl on sea bottom. Pectenaria, Owenia, Diopatra, Clymenella. Wikimedia Commons has media related to Adaptive radiation.

Explain adaptive radiations in Polychaeta

Fields and applications Applications of evolution Biosocial criminology Ecological genetics Evolutionary aesthetics Evolutionary anthropology Evolutionary computation Evolutionary ecology Evolutionary economics Evolutionary epistemology Evolutionary ethics Evolutionary game theory Evolutionary linguistics Evolutionary medicine Evolutionary neuroscience Evolutionary physiology Evolutionary psychology Experimental evolution Phylogenetics Paleontology Selective breeding Speciation experiments Sociobiology Systematics Universal Darwinism.

Arenicola excavates L-shaped burrows. The other finches in the Galapagos are similarly uniquely adapted for their particular niche.

Detritus feeders may be of two types, Direct deposit feeders- Some of the polychaetes obtain their food by directly swallowing sand and mud as they burrow through it. A process in which organisms diversify rapidly from an ancestral species into a multitude of new forms. Parapodia are small and locomotion is by lateral undulation of body.