abiotic and biotic factors can affect the change in population size
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Answers:this is one of the book which will give u perfect answer. sorry google is not allowing to copy paste it. so please refer this one. http://books.google.co.in/books?id=yC97pHFDYHAC&pg=PA250&lpg=PA250&dq=how+biotic+%26+abiotic+factors+affect+the+size+of+population&source=web&ots=nuomS5xNTY&sig=aUzkKmgCDmwWb_YLAtKICSloFhQ&hl=en&sa=X&oi=book_result&resnum=1&ct=result ~all d best ~
Answers:Carrying capacity is the maximum population of a given species that a particular habitat can sustain indefinitely without degrading the habitat. Keep in mind that no population can increase its size indefinitely. Populations grow rapidly with ample resources, but as resources become limited, its growth rate slows and levels off and the population size stabilizes at or near the carrying capacity. Why? Environmental resistance. Depending on resource availability, the size of a population often fluctuates around its carrying capacity, although a population may temporarily exceed its carrying capacity and suffer a sharp decline or crash in its numbers.
Answers:Biotic Factors Biotic, meaning of or related to life, are living factors. Plants, animals, fungi, protist and bacteria are all biotic or living factors. Abiotic Factors Abiotic, meaning not alive, are nonliving factors that affect living organisms. Environmental factors such habitat (pond, lake, ocean, desert, mountain) or weather such as temperature, cloud cover, rain, snow, hurricanes, etc. are abiotic factors. Biotic and abiotic factors combine to create a system or more precisely, an ecosystem. An ecosystem is a community of living and nonliving things considered as a unit. If a single factor is changed, perhaps by pollution or natural phenomenon, the whole system could be altered. For example, humans can alter environments through farming or irrigating. While we usually cannot see what we are doing to various ecosytems, the impact is being felt all over. For example, acid rain in certain regions has resulted in the decline of fish population.
Answers:Yes, I think you have it right. Community ecology is the study of the biotic organisms. However, the community can be affected by abiotic factors. You can study how abiotic factors effect the biotic community (e.g. nutrients effects on plant diversity), but this is starting to get into ecosystem ecology. These two disciplines often overlap -- it's hard to say exactly when you cross from community ecology to ecosystem ecology. One thing that separates them is that ecosystem ecology usually focuses on flows and fluxes of energy and matter through an ecosystem (e.g. nutrient cycles). So you are right that community ecology is biotic interactions and ecosystem ecology is abiotic + biotic interactions, but there is not always a clear distinction. Another thing is that community ecology will focus on the species or functional groups (tree growth in response to herbivory). Ecosystem ecology will focus on the ecosystem as a whole system -- it will ignore the species and focus on whole ecosystem processes. Hope that helps to clear things up a bit.