Ximi Elga


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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Introduction to evolution Evidence of evolution Common descent Evidence of common descent. They include most crawling, burrowing and tubicolous and all pelagic polychaetes. These are tube dwelling polychaetes. Disclaimer Privay Policy Contact Us. Effective septa compartment the coelomic fluid which has skeletal role in locomotion. Malawi Cichlids in their natural habitat, 5th edition. Chaetopterus which lives in U-shaped parchment tube has a unique method of food selection.

Annual Review of Ecology, Evolution, and Systematics.

These are marine, freely moving animals that crawl on sea bottom. Adaptibe, a number of particularly divergent species are known from Malawi, including the piscivorous Nimbochromis livingtoniiadaptiv lies on adapptive side in the substrate until small cichlids, perhaps drawn to its broken white patterning, come to inspect the predator – at which point they are swiftly eaten.

Parchment tubes- These kinds of tubes are membranous, usually U-shaped. 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.


The Beak of the Finch: Mouth has eversible pharynx. They generally have semitransparent body that imparts them near invisibility. Parapodia are small and locomotion is by lateral undulation of body.

Histriobdella lives as ectoparasite in the gill chamber of crustaceans and sucks blood. Body segments are generally similar.

Adaptive radiation – Wikipedia

A process in which organisms diversify rapidly from an ancestral species into a multitude of new forms. They do not have a proboscis.

These kinds of polychaetes are adapted to live in open sea and are semi-transparent in appearance. Retrieved from ” https: Discovering Physical Anthropology 2 ed. Explicit use of et al. jn

Adaptive radiation

Social implications Evolution as fact and theory Social effects Creation—evolution controversy Objections to evolution Level of support. Based on the form and construction the tubicolous burrows are of following types:.

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.

Evolution as fact and theory Social effects Creation—evolution controversy Objections to evolution Level of support. Genesis, explosive speciation, key-innovations and phylogeography of the haplochromine cichlid fishes”.


Chaetopterus, Platynereis Polychawta tubes- These tubes are made up of calcium.

The two large glands under the collar fold secrete calcium carbonate which forms the tube. Eunice, Perinereis Shell and sand grain tubes- These kinds of tubes are usually straight, built vertically in sand or mud. In Chaetopterus the parapodial setae become peg-like or hook-like for anchoring the animal to the wall of the tube and water current is maintained by three fan-like appendages. Adaptive radiation tends to take place under the following conditions: Retrieved June 3, The following is the discussion of the adaptive diversity of polychaetes.

Head bears sense organs such as eyes, tentacles and palps. The Hawaiian honeycreepers form a large, highly morphologically diverse species group that began radiating in the early days of the Hawaiian archipelago.


Head bears sense organs such as eyes, tentacles, antennae, cirri and palps. Setae help to anchor against the burrow wall. Lake Tanganyika is the site from which nearly all the cichlid lineages of East Africa including both riverine and lake species originated. Parapodia help in crawling and swimming. Mucus lined burrows- Some errant polychaetes make mucus-lined burrows in sand and mud.

Tanganyika Cichlids in their natural habitat, 3rd Edition. In other projects Wikimedia Commons.