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11 Cards in this Set

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  • Back
abiotic environmental factor that varies in space and time and affects the performance of organism
all things consumed (used up) by organisms (space, nutrients, water, prey, holes for refuge, etc)
Macan’s filter
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)
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)
Interactive resources
An organism does not need certain resources independently. For example, one that gets more heat might need more water, or less nitrogen.
Non-interactive resources
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.
Range of conditions, resource levels, and densities of other species within which an organism or species can survive and reproduce
Fundamental Niche
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)
Realized Niche
the (generally smaller) niche volume occupied by a species in the presence of interspecific interactions
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.
Time dependency (along with acclimatization) of niche
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.