Set 6 - Part 3 - Community Ecology - Khan Academy

celine's version from 2018-02-22 04:29

Section 1

Question Answer
An ecological ____________ consists of all the populations of all the different species that live together in a particular
Interactions between different species in a community are called ____________ interactions—inter- means "between."interspecific
Interspecies interactions can be broken into three main categories: Competition, Predation, and symbiosis
Organisms of two species use the same limited resource and have a negative impact on each other.Competition
Species compete when they have overlapping ____________, that is, overlapping ecological roles and requirements for survival and reproduction.niches
Competition negatively affects __________ participants (-/- interaction)both
A member of one species, predator, eats all or part of the body of a member of another species, prey.Predation
Predation is __________ for the predator, but harmful for the prey (+/- interaction).beneficial
A special case of predation in which the prey species is a plantHerbivory
A general term for interspecific interactions in which two species live together in a long-term, intimate association.Symbiosis (Mutualism, Commensalism, & Parasitism)
A long-term, close association between two species in which both partners benefitMutualism
A long-term, close association between two species in which one benefits and the other is unaffectedCommensalism
A long-term, close association between two species in which one benefits and the other is harmedParasitism

Section 2

Question Answer
A species' __________ is its ecological role or "way of life," which is defined by the full set of conditions, resources, and interactions it needsniche
The __________ tells us that two species can't have exactly the same niche in a habitat and stably coexist. That's because species with identical niches also have identical needs, which means they would compete for precisely the same resources.competitive exclusion principle
Competitive exclusion may be avoided if one or both of the competing species uses a different resource, occupy a different area of the habitat, or feed during a different time of day. The result is that two similar species use largely non-overlapping resources and thus have different niches. This is called __________, and it helps the species coexist because there is less direct competition between them.resource partitioning
2 types of Defense mechanisms against predationMechanical defenses & Chemical defenses
The presence of thorns on plants or the hard shell on turtles are examples of Mechanical defense
Foxglove is extremely toxic when eaten is an example of Chemical defense
Avoiding detection by blending in with the backgroundcamouflage (chameleon changes its color to match its surroundings)
Many species use bright or striking coloration to warn of a foul taste, a toxic chemical, or the ability to sting or bite. This type of defensive mechanism is called __________, or warning coloration. aposematic coloration
Rabbits and deer eat lettuce leaves from a garden. What ecological interaction describes the relationship between the rabbits and the deer?Competition
A flowering plant produces a high energy nectar to attract bees. When the bees feed on the nectar, bits of pollen stick to them and are transferred to other flowers. Best definition for the ecological interaction between the flowering plant and the bees?Mutualism
Tapeworms live inside the digestive tracts of host organisms and feed on the nutrients of the food they eat. What type of ecological interaction does the tapeworm have with its host?Parasitism
Barnacles attach themselves to the body of a whale so that they can migrate to new feeding grounds. The whale is not helped or harmed by the barnacles. What type of ecological interaction exists between the whale and the barnacles?Commensalism

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