remain constant - increased or decline dramatically Increasing human activity and interference (eg. The clearing of vast area of forests and woodlands for agriculture) - disease‚ predation‚ competition‚ availability of resources Vocabulary : self-sustaining: Dramatically: Interference: Predation Bushland interaction: Distribution: Abiotic & biotic: - able to provide for your own needs without help from others - something happens suddenly and is very noticeable and surprising
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postlarval and juvenile stages (Moksnes et al.‚ 1998). This cannibalism tends to be density dependent and self-regulates populations of C. 5 maenas (Moksnes‚ 2004). Mortality by means of predation by H. sanguineas serves to further thin populations. C. 5 maenas is also very efficient in selecting habitats with low risk of predation (Moksnes‚ 2002). H. sanguineus populations are at higher densities in rocky intertidal areas‚ the same refuge habitat preferred by juvenile C. maenas. In response‚ C. 5 maenas has
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muhammad Bio 104 2/15/13 Critique of the Pepperd Moth Experiment In the next few paragraphs I will be giving you two different types of experiments conducted. The first is going to be by Kettlewell and the second is by Rory Howlett and Michael Majerus. I will be explaining what they did in each of them as well as give you a conclusion and my own personal critique on each of them. The Kettlewell Experiment In early Great Britain it was noticed that there was a depletion of the light colored
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Reintroduction of Wolves to Yellowstone Reintroduction is defined as the act or attempt to bring back a species to its known niche after being threatened to near extinction (Howard and Somers 2009). This was the case for the gray wolf population in Yellowstone National Park‚ as well as throughout most of the U.S. The gray wolves at one point occupied the U.S. in large numbers‚ but when settlers came to America‚ a conflict between the wolves and the settlers became apparent. The conflict was that
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THE VALUE OF NATURAL ECOSYSTEMS The most important of the inherent values of natural ecosystems is that they contain within themselves creative powers‚ which‚ over large spans of time‚ have produced the stupendous array of biodiversity the world over. The presence of a species and the things that it can do have a powerful bearing on shaping the environment of all. Organisms help to make the world and then it makes them. Humans are among the most complex of the achievements of the natural forces
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2a. Births‚ deaths‚ immigration‚ and emigration. 2b. The dandelion population will probably grow. Eventually‚ dandelions might take over the lawn. 3a. A population grows exponentially when it has all of the resources it needs and disease and predation do not occur. 3b. Exponential growth shows a “J shaped” curve because with each generation‚ the number of organisms producing offspring increases‚ resulting in a rapid increase in population size. 4a. A logistic growth curve has an S-shape. 4b
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Marine Ecology Final Exam Review Difference between broadcast spawners‚ brooders‚ direct developers‚ lecithotrophic and planktotrophic larvae * Many marine organisms have a dispersal phase in their life history * Dispersal can occur as eggs‚ sperms‚ fertilized eggs‚ larvae‚ juveniles or adults * Many species only disperse as juveniles or adults * Other species take advantage of high density of water to disperse during very early life stages: eggs/sperm/fertilized eggs/larvae
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defense against herbivory that plants have would be thorns on a rose. The thorns repel any invaders from eating them because they prick and hurt. Note that plants cannot fully prevent herbivore predation because they are the bases of the food chain‚ but they have adapted these defenses to avoid excess predation. Chemical defenses against herbivores are usually secreted toxins with an unpleasant taste or smell that repel any potential threats to the plant. Take the chemical canavanine for example
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Sex change in Aquatic Species By: Gobezai Abebe Introduction. Many species of invertebrates‚ fish and plants undergo a process which is rare and requires detailed research to understand (Allsop and West‚ 2003). The process that they undergo is known as sex change. Focusing specifically on hermaphroditic fish‚ sex change can occur in two directions. One direction that sex change can occur is the change from female to male which is known as protogyny (Allsop and West‚ 2003; Kuwamura et.al‚ 2002;
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Cited: Arnold‚ Kathryn E. 2000. Kin Recognition in Rainbowfish (Melanotaenia eachamensis): Sex‚ Sibs and Shoaling. Behavioral Ecology and Sociobiology.‚ 48(5): 385-391. Brahams‚ M. and Colgan‚ P. 1985. Risk of predation‚ hydrodynamic efficiency‚ and their influence on school structure. Environmental Biology of Fishes.‚ 13(3): 195-202. Chivers‚ D.P.‚ G.E. Brown‚ and R.J.F. Smith. 1995. Familiarity and shoal cohesion in fathead minnows (Pimephales promelas)— implications
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