ECOLOGY LECTURES 5-6

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  • Created by: m_ghammer
  • Created on: 19-05-18 16:45
semelparous
breeding once; juvenile phase dominated by growth; post-reproductive phase very short, may involve parental care
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iteroparous
breeding more than once; extended reproductive phase; seasonal reproduction in temperate zones [increased food abundance]
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cohort
longitudinal study of all animals born in a year; monitored until the organism dies
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carrying capacity (k)
maximum numbers an ecosystem can support, depends on abiotic factors and density-dependent changes in death rate [fluctuates over time]
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R-selected species
high growth rate, short life span, small size, early reproductive age, high infant mortality (type 3 life table)
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K-selected species
stable populations existing close to carrying capacity; fewer offspring (type 1 life table); larger size and longer life span
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fundamental niche
the full range of environmental conditions in which each of the species survives, without any other limiting factors which may constrain the population
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realised niche
the range of environmental conditions in which the species is really found as a result of limiting factors
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Gause's Principal/competitive exclusion
two species competing for the same limiting resource cannot coexist; niche differentiation means that two competing species may survive in the same habitat without one eliminating or excluding the other
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character displacement
evolutionary divergence that occurs when similar species occupy the same environment: natural selection favours organisms with modifications to reduce competitive pressures for resources
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resource partitioning
natural selection drives competition species to occupy different niches to reduce competition
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ecological release
population increase occurring when a species is released from its limiting factors or when a species expands its niche into a new habitat
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aposematic colouration
colours/patterns used to act as a warning to predators e.g. ladybugs
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Batesian mimicry
an edible/harmless animal mimics another to avoid predation, e.g. hoverflies and wasps
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cryptic colouration (crypsis)
camouflage to match the colour and texture of surroundings
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Other cards in this set

Card 2

Front

iteroparous

Back

breeding more than once; extended reproductive phase; seasonal reproduction in temperate zones [increased food abundance]

Card 3

Front

cohort

Back

Preview of the front of card 3

Card 4

Front

carrying capacity (k)

Back

Preview of the front of card 4

Card 5

Front

R-selected species

Back

Preview of the front of card 5
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