Biology 2483A Lecture 15: 15-Nature of Communities.docx
2 Jan 2015
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Invasive species spread rapidly; interferences in new habitat. Seaweed species affected sedimentation shifts in growth between seasons. Although so far we have considered species interactions in two-way relationships, in reality, species experience multiple interactions that shape the communities in which they live. Communities are groups of interacting species that occur together at the same place and time. This approach emphasizes the importance of an abundant species, such as trees: include soil fungi, bacteria, insects, difficult to characterize everything all at once. Taxonomic affinity e. g. , all bird species in a community: guild group of species that use the same resources. (animals, all using same food source, but not related. Functional group species that function in similar ways, but do not necessarily use the same resources. Tend to be used for plants, but can be used for animals trophic or energetic. Trophic levels: primary producers (autotrophs) plants and, primary consumers herbivores, secondary consumers carnivores.
