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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Ecology and Adaptive Radiation of Anoles. The shallow sea bottom is a source of food of great nutritional value as it contains bacteria, diatoms and other dead organic matter. Speciation Evolutionary biology terminology.

Explain adaptive radiations in Polychaeta –

The Ecology of Adaptive Radiation. Retrieved June 3, Discovering Physical Anthropology 2 ed. Based on the form and construction the tubicolous burrows are of following types: Parapodia are small and locomotion is by lateral undulation of body. Much like in the case of the cichlids of the three largest African Great Lakes, each of these islands is home to its own convergent Anolis adaptive radiation event.

Arenicola, Glycera, Amphitrite and Terebella Tubicolous polychaetes: Class Polychaeta shows the greatest diversity in Phylum Annelida.

Polychaete Diversity

The haplochromine cichlid fishes in the Great Lakes of the East African Rift particularly in Lake TanganyikaLake Malawiand Lake Victoria form the most speciose modern example of adaptive radiation. Head bears sense organs such as eyes, tentacles and palps. i


These animals spend most of their time inside the burrows and come out only to catch the prey. These worms are carnivorous and extend out from the tube openings to catch the prey.

Explain adaptive radiations in Polychaeta

Sometimes a mucous cone is produced from mouth to trap food particles. Sometimes these tubes may be covered by sand grains and shells Ex: These tubes are composed of sand oolychaeta and shell pieces cemented together with mucus. Cirri are generally longer and carry tango receptors which help in locating food. Adaptive radiation is not a strictly vertebrate phenomenon, and examples are also known adaptife among plants.

Some have large eyes while others have none.

Adaptive radiation – Wikipedia

This mucus bag ends in a ciliated food cup where the food is rolled up into a ball and passed forward to the mouth along the ciliary inn. Their setae have become hook-like to anchor in the burrow. Views Read Edit View history. Adaptove on the form and construction the tubicolous burrows are of following types:.

This causes the sand to cave in forming a funnel-shaped depression at the surface. Hence, their semitransparent body that imparts them near invisibility and thus protects them from predators. Its small body is oval in polychaea and parapodia are modified for clinging onto the host. Tubicolous polychaetes live permanently inside the tubes made of mud, shell or sand grains, parchment or calcium carbonate. Their body is elongated, prostomium is reduced or absent.


Nereis, Phyllodoce, Colycera Pelagic polychaetes: These polychaetes are adapted for burrowing in sand. The cactus finches Geospiza sp.

Victoria is famously home to a radiatio number of piscivorous cichlid species, some of which feed by sucking the contents out of mouthbrooding females’ mouths. Planktonic polychaetes swim near the surface of the sea where the danger of predators and solar radiation is excessive.

Login to post your comment here The beating of these fans produces water current which enters the tube from the anterior araptive and flows out of the posterior end. 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. Lake Tanganyika is radiatuon site from which nearly all the cichlid lineages of East Africa including both riverine and lake species originated.

The other finches in the Galapagos are similarly uniquely adapted for their particular niche.

Shell and sand grain tubes- These kinds of tubes are usually straight, built vertically in sand or mud. Presented above are the most well-documented examples of modern adaptive radiation, but other examples are known.