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RIM (Reproductive Isolating Mechanism) - Coggle Diagram
RIM (Reproductive Isolating Mechanism)
Prezygotic
Geographical: physical barriers separating pop. - unable to breed because of different selection pressures in different environments
Ecological: different 'niches' same geographical location - pop. that are ecologically isolated seldom (rarely) come into contact with each other
Structural/Morphological: differences in external reproductive organs - different organs may not allow for the transfer of gametes (sperm or pollen)
Temporal: breeding behaviour occurs at different/non-overlapping times e.g. daily (differences in timing of mating), seasonal (differences of mating/pollination)
Behavioural: differences in mating behviour, courtship behaviour and activity patterns
Activity patters
Diurnal: day time activity
Noctural: night time activity
Crepuscular: twilight activity (sun is below the horizon)
Gametic: incompatibility of gametes
Egg surface without right chemical receptors
Sperm cannot penetrate surface of egg
Sperm cannot survive in chemical environment of female
Postzygotic
Hybrid Inviability: zygote embryo/offspring in inviable - dies early in development
Inviable: unable to survive or develop normally
Hybrid sterility: hybrid reaches maturity but is infertile
Hybrid Breakdown: occurs when hybrid reaches maturity, able to breed but next/subsequent gene. are infertile/reduced reproductive capacity
RIMS act cocurrently resulting in speciation
RIMS may result from or a combination of prezygotic and postzygotic isolating mechanisms