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11 Cards in this Set
- Front
- Back
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Condition
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abiotic environmental factor that varies in space and time and affects the performance of organism
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Resource
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all things consumed (used up) by organisms (space, nutrients, water, prey, holes for refuge, etc)
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Macan’s filter
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If a species is absent from a habitat, is it because of:
-Dispersal (barriers, insufficient time) -Behavior (colonists avoid habitat) -Abiotic factors (temperature, salinity, pH, moisture conditions* etc. are outside the range that the species can tolerate) -Biotic interactions (species is excluded by predators, pathogens, competitors, or the lack of prey resources or mutualists) |
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Propagule
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a dispersing unit capable of establishing a new population (e.g., one asexual spore, Adam and Eve, a pregnant female fish, or a fragment of a plant that can reproduce vegetatively)
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Interactive resources
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An organism does not need certain resources independently. For example, one that gets more heat might need more water, or less nitrogen.
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Non-interactive resources
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Independent resources that an organism needs. For example, a human being needs both iron and calcium, though ingesting one will not affect the need for the other.
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Niche
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Range of conditions, resource levels, and densities of other species within which an organism or species can survive and reproduce
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Fundamental Niche
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the largest niche in which a species could persist in the absence of adverse interactions with other species
(not necessarily overlapping with realized niche - algae associated in lichen have an entirely shifted niche than alone) |
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Realized Niche
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the (generally smaller) niche volume occupied by a species in the presence of interspecific interactions
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Acclimatization
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shifts in the response of an organism to a condition caused by the regime it has experienced in the past
E.g. trees can tolerate lower temperatures in October than they can if surprised in mid-summer, because they’ve induced new types of proteins and restructured cell membrane phospholipids. |
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Time dependency (along with acclimatization) of niche
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Either organisms limited by the maximum level of a condition, or by whether it lasts a certain period of time.
– Crayfish or starfish displaced by short bursts of fast flow, but if current increases gradually, may hunker down and hold on – Saguaro cacti can tolerate freezing if there is a daily thaw, but can’t take it if freezing temperatures last more than 30 hours. |
