Reproductive isolating mechanisms influencing the direction of Banded Killifish (Fundulus diaphanus) x Common Killifish (F. heteroclitus) hybridization in Porter’s Lake, Nova Scotia

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dc.creator MacPherson, Nathalie
dc.date.accessioned 2021-09-27T17:25:03Z
dc.date.available 2021-09-27T17:25:03Z
dc.date.issued 2021-08-24
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/29938
dc.description.abstract Hybridization events provide opportunities to examine the mechanisms influencing interspecific reproductive isolation. In Porter’s Lake, Nova Scotia, hybridization between two killifish species (Fundulus heteroclitus and Fundulus diaphanus) predominantly occurs with F. diaphanus mothers and F. heteroclitus fathers. To test if pre-zygotic isolating barriers contributes to this cross-direction bias, breeding behaviour was studied in the lab. Fundulus heteroclitus females preferred conspecific males while F. diaphanus females showed no preference. Additionally, all possible pairwise crosses were made in vitro and incubated at four salinities to test reproductive barriers related to fertilization and hybrid development. Fundulus heteroclitus x F. diaphanus (female x male) hybrids had lower fertilization and longer development times than other cross types. Together, these results suggest that both pre- and post-zygotic mechanisms contribute to the absence of F. heteroclitus x F. diaphanus hybrids in the wild, and that additional, un-measured reproductive isolating mechanisms are also likely to be quite important. en_CA
dc.description.provenance Submitted by Greg Hilliard (greg.hilliard@smu.ca) on 2021-09-27T17:25:03Z No. of bitstreams: 1 MacPherson_Nathalie_MASTERS_2021.pdf: 3807691 bytes, checksum: 2632ed5111bcf7973b2c21ac112a4983 (MD5) en
dc.description.provenance Made available in DSpace on 2021-09-27T17:25:03Z (GMT). No. of bitstreams: 1 MacPherson_Nathalie_MASTERS_2021.pdf: 3807691 bytes, checksum: 2632ed5111bcf7973b2c21ac112a4983 (MD5) Previous issue date: 2021-08-24 en
dc.language.iso en en_CA
dc.title Reproductive isolating mechanisms influencing the direction of Banded Killifish (Fundulus diaphanus) x Common Killifish (F. heteroclitus) hybridization in Porter’s Lake, Nova Scotia en_CA
dc.type Text en_CA
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