ECOLOGY LECTURES 5-6

?
  • 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
1 of 15
iteroparous
breeding more than once; extended reproductive phase; seasonal reproduction in temperate zones [increased food abundance]
2 of 15
cohort
longitudinal study of all animals born in a year; monitored until the organism dies
3 of 15
carrying capacity (k)
maximum numbers an ecosystem can support, depends on abiotic factors and density-dependent changes in death rate [fluctuates over time]
4 of 15
R-selected species
high growth rate, short life span, small size, early reproductive age, high infant mortality (type 3 life table)
5 of 15
K-selected species
stable populations existing close to carrying capacity; fewer offspring (type 1 life table); larger size and longer life span
6 of 15
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
7 of 15
realised niche
the range of environmental conditions in which the species is really found as a result of limiting factors
8 of 15
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
9 of 15
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
10 of 15
resource partitioning
natural selection drives competition species to occupy different niches to reduce competition
11 of 15
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
12 of 15
aposematic colouration
colours/patterns used to act as a warning to predators e.g. ladybugs
13 of 15
Batesian mimicry
an edible/harmless animal mimics another to avoid predation, e.g. hoverflies and wasps
14 of 15
cryptic colouration (crypsis)
camouflage to match the colour and texture of surroundings
15 of 15

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
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Ecology resources »