indirect effects of whole-genome duplication on prezygotic
isolation in Chamerion angustifolium: implications for rapid speciation.
Absence of a prezygotic
behavioural barrier to gene flow between the two sympatric morphs of the squat lobster Munida gregaria (Fabricius, 1793) (Decapoda: Anomura: Galatheidae).
isolation in flour beetles.
2011a) suggested that a prezygotic
explanation is more likely owing to the lack of hybrid individuals and strong Wahlund effect in areas of sympatry.
This process occurs due to differences in the acrosome and/or flagellum which produce prezygotic
incompatibility (between sperms and eggs), because there are receptors located in these structures that are used for fertilization in some marine invertebrates, especially those with external fertilization (Pitnick et al.
barriers resulting from pollenpistil incompatibility, where pollen grain germination and pollen tube growth of one species is inhibited by the stigma of another species (BURSON & YOUNG, 1983) are quite common.
2001; Norrbom & Korytkowski 2011) and is currently known to be a complex of cryptic species (AF complex) that exhibit considerable levels of prezygotic
and postzygotic reproductive isolation (Selivon et al.
This is because the sessile or sedentary nature of broadcast spawners provides little or no opportunity for prezygotic
There is limited evidence for prezygotic
pollen rejection in conifers (Runions & Owens, 1998), but clearly it could not involve cell recognition beginning at a stigma surface as in angio-ovulate plants.
In conclusion, our study demonstrates that both prezygotic
and postzygotic barriers to hybridization exist between C.
Therefore, such failure in germination of the seeds from self-pollination may be due to prezygotic
Our results suggest that there are no mechanisms of prezygotic
self-incompatibility in B.