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Evidence of unidirectional hybridization and second‐generation adult hybrid between the two largest animals on Earth, the fin and blue whales

Pampoulie, C, Gíslason, D, Ólafsdóttir, G, Chosson, V, Halldórsson, SD, Mariani, S, Elvarsson, BÞ, Rasmussen, MH, Iversen, MR, Daníelsdóttir, AK and Víkingsson, GA Evidence of unidirectional hybridization and second‐generation adult hybrid between the two largest animals on Earth, the fin and blue whales. Evolutionary Applications. ISSN 1752-4571 (Accepted)

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Evidence of unidirectional hybridization and second‐generation adult hybrid between the two largest animals on Earth, the fin and blue whales.pdf - Accepted Version
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Open Access URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/ev... (Accepted version)

Abstract

Biodiversity in the oceans has dramatically declined since the beginning of the industrial era, with accelerated loss of marine biodiversity impairing the ocean's capacity to maintain vital ecosystem services. A few organisms epitomize the damaging and long‐lasting effects of anthropogenic exploitation: some whale species, for instance, were brought to the brink of extinction, with their population sizes reduced to such low levels that may have cause a significant disruption to their reproductive dynamics and facilitated hybridization events. The incidence of hybridization is nevertheless believed to be rare and very little information exist on its directionality. Here, using genetic markers, we show that all but one whale hybrid sample collected in Icelandic waters originated from the successful mating of male fin whale and female blue whale, thus suggesting unidirectional hybridization. We also demonstrate for the first time the existence of a second‐generation adult (male) hybrid resulting from a backcross between a female hybrid and a pure male fin whale. The incidence of hybridization events between fin and blue whales is likely underestimated and the observed unidirectional hybridization (for F1 and F2 hybrids) is likely to induce a reproductive loss in blue whale, which may represent an additional challenge to its recovery in the Atlantic Ocean compared to other rorquals.

Item Type: Article
Uncontrolled Keywords: 0304 Medicinal and Biomolecular Chemistry, 0603 Evolutionary Biology, 0604 Genetics
Subjects: Q Science > QH Natural history
Q Science > QL Zoology
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Wiley Open Access
Date Deposited: 21 Aug 2020 10:20
Last Modified: 21 Aug 2020 10:30
DOI or Identification number: 10.1111/eva.13091
URI: https://researchonline.ljmu.ac.uk/id/eprint/13527

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