Species Intrxns [8]

Description

species interactions
Anya Skovoroda
Flashcards by Anya Skovoroda, updated more than 1 year ago
Anya Skovoroda
Created by Anya Skovoroda over 9 years ago
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Question Answer
metapopulation population of spatially isolated subpops connected by dispersal, only concerned with pop persistence
assumptions of metapops (3) (a) v.large network quality patches separated by bad habitat (b) connected by dispersal w/prob of recoloniz :=c (c) prob of extinct := e
"blinking lights" model a pop won't go extinct if any one of its metapops goes extinct as long as the organisms persist in the whole pop
source-sink model [draw the flow diagram]
source-sink model [definition] no recolonization of the source territory if e>c in the sink territories
abundance vs. density total # of individuals in pop vs. total # of ind in pop per unit of area
types of absolute abundance estimates (2) (a) transects or quadrats (b) mark and recapture
assumptions of absolute abundance estimates (4) (a) random capture (b) marking doesn't increase risk of death (c) marks are lost or missed (d) no immigr/emigr
relative abundance estimates [examples] traps (catch/unit) # fecal pellets/m^2 # bird calls every 15 min road kill per mile of road
competition
intraspecific competition btwn ind of same species
interspecific competition btwn ind of diff species
exploitation competition indirect comp for shared resource (food, water, space)
interference competition direct physical aggression
competitive exclusion when one sp drives the other to extinction due to competition
facilitating coexistence (4) (a) varied resources (b) disturbance "bounce back" (c) varied time and space (d) predation on superior competitor
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