C. The entire group of a single species in multiple ecosystems. Based on MacArthur and Wilson's island equilibrium model, how would you expect the richness of birds on islands to compare with the richness of snakes and lizards? Sea star Pisaster ochraceus preys on mussels such as Mytilus californianus, a dominant species and strong competitor for space. If the top-down model applied? A more practical approach might be to quarantine all pets brought into the country that are potential carriers of the disease, the approach the British government actually takes. A model of community organizaition in which mineral nutrients influence community organization by controlling plant or phytoplankton numbers, which in turn control herbivore numbers, which in turn control predator numbers. Authoritative and non-polemical, this book is the perfect teaching tool for classes addressing various types of collection. Why does succession of communities occur? ___________________ are usually less abundant species that exert a disproportionate influence on community structure. For example, ticks that feed as ___________________ on moose can weaken their hosts by withdrawing blood and causing hair breakage and loss. ______________________ are the most abundance species in a community. On the other hand, moderate levels of disturbance can facilitate coexistence of a greater number of species in a community by preventing competitively dominant species from becoming abundant enough to eliminate other species from the community. A community is best defined as… Select one: A. Explain. How might genetic variation between shrew populations in different locations affect the number of infected ticks? The Five Disciplines of Intelligence Collection describes, in non-technical terms, the definition, history, process, management, and future trends of each intelligence collection source (INT). It is formed as a result of cooperation between the police and the community. Which of the following could qualify as a top-down control on a grassland community? Community ecology provides the framework for identifying key species interactions associated with pathogens and for helping us track and control their spread. Suppose rising sea levels substantially decreased the size of the island. This information is used to manage the library's resources and to make other decisions relevant to the general operations. Communities may share a sense of place situated in a given geographical area or in virtual space through communication platforms. A community of practice is a group of people who "share a concern or a passion for something they do and learn how to do it better as they interact regularly". Suppose the abundance of carnivores that eat zooplankton increased greatly. During succession, how might the early species facilitate the arrival of other species? Most prairies experience regular fires, typically every few years. Aposematic coloration (warning coloration). The sea otters at the top of the trophic cascade (keystone species) had been fished to extinction, which caused the sea urchins to live without the checks and balances of sea otters. Positive interactions; mutualism; commensalism. ________________________ (+/-) One species benefits by feeding upon the other species, which is harmed. Which organisms are particularly at risk? Community definition, a social group of any size whose members reside in a specific locality, share government, and often have a common cultural and historical heritage. The methods of data collection vary according to: Degree of structure Degree of quantifiability Degree of obtrusiveness Degree of objectivity 6. In sample survey information is collected from a subset of the population. WHAT IF? _______________________ generally declines along a latitudinal gradient from the tropics tot eh poles. The malaria-carrying mosquito is the chief food for a particular kind of bird in the forest. All the organisms that inhabitat a particular area; an assemblage of populations of different species living close enough together for potential interaction, "With one snap of its jaw the eel could easily crush the fish and swallow it. Problem: A community is best described as the collection of:A. ecosystems found in a particular areaB. Caribbean coral reef communities have been strongly influenced by an unknown pathogen that causes white-band disease. High levels of disturbance are generally so disruptive that they eliminate many species from communities, leaving the community dominated by a few tolerant species. Keystone species are those species ________. Branching food chains and complex trophic interactions form ________________. The most plausible hypothesis to explain to explain why species richness is higher in tropical than temperate regions is that: B. The much larger animal remains still, with its mouth open, and allows the smaller fish free passage as it picks out and eats tiny parasites living inside the eel's mouth and on its skin.". More diverse communities are also more stable year to year in their productivity. A community is a social unit with commonality such as norms, religion, values, customs, or identity. The ants feed on nutrients produced by the acacias. Community policing is best characterized as a partnership. An example of _______________ is when the larva of the hawk moth Hemeroplanes ornatus puffs up its head and thorax when disturbed, looking like the head of a small venomous snake. Based on the intermediate disturbance hypothesis, a community's species diversity is increased by: According to the island equilibrium model, species richness would be greatest on an island that is: Predators that are keystone species can maintain species diversity in a community if they: B. Prey on the community's dominant species, C. Most of the energy in a trophic level is lost as energy passes to the next higher level. A type of mimicry in which a harmless species resembles an unpalatable or harmful species to which it is not closely related. Higher-diversity communities are often more resistant to _____________, which are organisms that become established outside their native range. This is an example of ________. ___________________ influence community structure through their effects on the physical environment. At the earliest stages of primary succession, free-living prokaryotes in the soil would reduce atomosphere N2 to NH3. At the earliest stages of primary succession, before any plants are present at a site, which type of nitrogen fixation would occur and why? B. An organism that influences community structure by causing physical changes in the environment. Imagine that two finch species colonize a new island and are capable of hybridizing (mating and producing viable offspring). An approach that applies the top-down model of community organization to alter ecosystem characteristics. If these disturbances were relatively modest, how would the species diversity of a prairie likely be affected if no burning occurred for 100 years? As a result, tropical communities are older than temperate or polar communities. An interaction in which an organism eats part of a plant or alga. B) Biotic Interactions That Occur In A Particular Area. whose absence would cause major disruption in a community. The _________________________ proposes that control of each trophic level comes from the trophic level above, with eh result that predators control herbivory, which in turn control primary producers. Explain how two communities with the same number of species can differ in species diversity. No, Shannon diversity allows ecologists to quantify the diversity of species. In the wake of September 11, local law enforcement has taken on a pivotal role in preventing and responding to future incidents of terrorism within the United States. Two species could resemble each other because they descended from a recent common ancestor and hence share many traits (including a resemblance to one another). A species of malaria-carrying mosquito lives in a forest I'm which two species of monkeys, A and B, coexist. the island's size and distance from the mainland. It is the most significant and common technique of data collection. The concept that moderate levels of disturbance can foster greater species diversity than low or high levels of disturbance. Based on indexes such as Shannon diversity, is a community of higher species richness always more diverse than a community of lower species richness? 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