By Allan B. Cobb

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Extra info for Animal Sciences: 4

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All algae, except prokaryotic cyanobacteria (formerly called blue-green algae), belong to the kingdom Protista. Algae all contain chlorophyll A, a primary pigment in cyanobacteria and plants, but differ in accessory pigments, which trap wavelengths of light to which chlorophyll A is not as sensitive. These accessory pigments include other chlorophylls (green), carotenoids (yelloworange), xanthophylls (brown), and phycobilins (red and blue). These differences in pigments point to different roles and effects of algae on the ecosystem.

London: Edward Arnold, 1969. Populations The study of populations and population ecology is a growing field of biology. Plants and animals are studied both singly and in relationship to one another. Factors that affect population growth and overall health are constantly being sought and analyzed. polyploid having three or more sets of chromosomes Animal populations are a bit easier to discuss since the genetic basis from which animal populations arise is not as complicated as the genetic basis of plants.

S E E A L S O Human Populations; Population Dynamics. Brook Ellen Hall Bibliography Gutierrez, A. P. Applied Population Ecology: A Supply-Demand Approach. New York: John Wiley & Sons, 1996. , and Joseph H. Connell. The Biology of Populations. New York: Wiley, 1996. Porifera The phylum Porifera contains all the species of sponges. Phylogenetically, Porifera is most closely related to Protista, making it the first animal phylum to have evolved to be multicellular. This also makes Porifera the simplest in form and function.

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