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Prevent Mating
Ecological, Temporal, Behavioural
Prevent fertilization
Gametic, Mechanical
Gametic
Males and females do copulate but sperm do not survive inside of females, and gametes do not unite
Ecological
Two species breed in the same area and during the same time, but not in the same place. One certain frog breeds In quiet streams, while the other breeds in rain pools.
Temporal
Species breed at different times or seasons, of the year. Ex. Red and Black Sea urchins release gametes at different times of the year.
Behavioural
Some individuals might not find certain behavioural characteristic of another individual attractive, such as mating rituals, birdsong,
Mechanical
When the sex organs are not compatible, or when pollen of a plant cannot occur due to certain structures. ex. Bird beaks have to be long, or short enough to pollinate a flower.
Post-Zygotic
After fertilization
Zygote Mortality
No fertilized zygotes or embryos develop to maturity
Hybrid Inviability
Gametes unite but genes are not compatible and result in weak offspring
Hybrid Sterility
Offspring does get born and is healthy, but cannot reproduce
Note 
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