BIO1042 Lecture Notes - Lecture 23: Tropical Rainforest, Biome, Succulent Plant
18 Oct 2018
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Bio1042 lecture 23 part 2 life and diversity. Aquatic biomes occupy the largest part of the biosphere: mari(cid:374)e (cid:271)io(cid:373)es have a salt (cid:272)o(cid:374)(cid:272)e(cid:374)tratio(cid:374) of ~ 3% a(cid:374)d (cid:272)over appro(cid:454)i(cid:373)atel(cid:455) 75% of the earth(cid:859)s surface. Eutrophic lakes are shallower and have increased nutrients. Terrestrial biomes: defined by their abiotic and biotic factors, vertical stratification is also important, tropical rain forest canopy - the top layer, covering layers below, permafrostin the tundra a permanently frozen stratum. Species composition of any biome differs from location to location: human activity - radically altered natural patterns of many biomes. Tropical forests: close to the equator, v. high amounts of rainfall (although this varies from region to region), and very high biodiversity , vegetation layered, with the canopy being one of the top layers. Savannas: grasslands with scattered trees, that show distinct seasons, particularly wet and dry. Fire an important abiotic factor frequent, low intensity.
