Spawning behavior and interspecific breeding in three Japanese greenlings (Hexagrammidae)

Munehara, Hiroyuki; Kanamoto, Ziyusei; Miura, Taito

doi:10.1007/bf02674252

Cited by 32 publications

(37 citation statements)

References 7 publications

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“…In the case of the three Hexagrammos species, we show that steep and complex breakwater structures may make an artificial mosaic hybrid zone containing two types of habitat in a single area, leading to a disruption of habitat isolation. Munehara et al (2000) found a highly frequent crossbreeding rate (19 of 26 matings, 73%) between male of H. otakii and the other two species in the same area as the Breakwater Area in this study from observations for over 600 hours with using an underwater video camera. In addition, Crow et al (2007) reported that 25 (31%) of the 76 specimens randomly sampled off the Usujiri Fisheries Station (same area as this study) were hybrids or backcrosses using genetic markers.…”

Section: Discussionsupporting

confidence: 51%

“…During breeding season, mature territorial males of Hexagrammos species demonstrate nuptial coloration variation including the following: the ventral and anal fins of H. agrammus and H. octogrammus males turn into black, and the bodies of H. otakii male turn into bright yellow (Munehara et al 2000). In each species, a territorial male guards eggs that are deposited in its territory (Munehara et al 2000).…”

Section: Distribution Of the Hexagrammos Species In Each Research Areamentioning

confidence: 99%

“…In each species, a territorial male guards eggs that are deposited in its territory (Munehara et al 2000). We distinguished territorial males from non-territorial individuals (mature females, sneaker males, and immature individuals) by their nuptial coloration and nest guarding behavior.…”

Section: Distribution Of the Hexagrammos Species In Each Research Areamentioning

confidence: 99%

“…Because of such habitat differences, it was thought that habitat isolation would inhibit hybridization between H. otakii and two shallow water species. However, frequent hybridization between H. otakii and either of the two shallow water species have been reported (Munehara et al 2000;Balanov et al 2001;Crow et al 2007). These studies suggest that the habitat isolation between H. otakii and the two shallow water species may be disrupted at some spawning sites.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the three species might establish their breeding territories close to each other in artificial breakwater area. In a previous study using underwater video camera, females from shallow water species were observed to spawn in the territories of the deep water species which were established on concrete blocks along a breakwater (Munehara et al 2000). To explore the cause of hybridization, we hypothesize that construction of artificial structures such as breakwaters with steep slopes would produce a mosaic habitat consisting of shallow and deep environments and increase the encounter rates between shallow and deep water species.…”

Section: Introductionmentioning

confidence: 99%

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The disruption of habitat isolation among threeHexagrammosspecies by artificial habitat alterations that create mosaic‐habitat

Kimura

Munehara

2009

Ecological Research

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In coastal areas in Japan, three species of greenling (Hexagrammos spp.) can hybridize. In a natural reef setting we showed that Hexagrammos agrammus and H. octogrammus established their breeding territories in a shallow area where seaweed was abundant, whereas H. otakii established breeding territories in a deep area that was sparsely covered with seaweed. This difference in habitat use resulted in H. otakii being distributed separately from the other two species, thereby reducing the potential for hybridization. However, all the three species co-occurred in an artificial area near a breakwater. This area is characterized by steep slopes and complex stacked concrete structures, which create a mosaic-habitat consisting of a shallow environment with seaweed and a deep environment with sparse seaweed, allowing the three species to breed within a single area. Our results suggest that man-made structures can create an artificial mosaic-habitat that can disrupt habitat isolation and promote hybridization between species.

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Section: Discussionsupporting

confidence: 51%

Section: Distribution Of the Hexagrammos Species In Each Research Areamentioning

confidence: 99%

Section: Distribution Of the Hexagrammos Species In Each Research Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The disruption of habitat isolation among threeHexagrammosspecies by artificial habitat alterations that create mosaic‐habitat

Kimura

Munehara

2009

Ecological Research

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Origins of two hemiclonal hybrids among three Hexagrammos species (Teleostei: Hexagrammidae): genetic diversification through host switching

Munehara

Horita

Kimura‐Kawaguchi

et al. 2016

Ecology and Evolution

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Two natural, hemiclonal hybrid strains were discovered in three Hexagrammos species. The natural hybrids, all of which were females that produced haploid eggs containing only the Hexagrammos octogrammus genome (maternal ancestor; hereafter Hoc), generated F1 hybrid‐type offspring by fertilization with haploid sperm of Hexagrammos agrammus or Hexagrammos otakii (paternal species; Hag and Hot, respectively). This study was performed to clarify the extent of diversification between the two hybrids and the maternal ancestor. Genealogical analysis using mtDNA revealed that all 38 Hoc/Hot hybrids formed a branch (Branch I) with 18 of the 33 Hoc/Hag hybrids. No haplotype sharing was observed with the maternal ancestor. Further, microsatellite DNA analysis suggested that the members of Branch I shared the same hemiclonal genome set. The results suggested that Hoc/Hot hybrids originated by anomalous hybridization, or “host switching,” between Hoc/Hag and Hot, and not from interspecific hybridization between Hoc and Hot. The remaining 9 of 11 Hoc/Hag haplotypes and all of the 27 Hoc haplotypes were mixed within the genealogical tree, as if they had originated from multiple mutations. However, Hoc/Hag could also mate with Hoc. Although offspring from this host switch (Backcross‐Hoc) have the same genome as normal Hoc, a part of their genome retains genetic factors capable of producing hemiclones. Consequently, when a descendant of a BC‐Hoc hybrid mates with Hag males, a new hemiclone lineage will arise. Multiple haplotype revival through host switching from a single mutation in hybrids is another possible hypothesis for the observed mixing of Hoc/Hag haplotypes within the mtDNA genealogical tree.

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The importance of ecological and behavioural data in studies of hybridisation among marine fishes

Montanari

Hobbs

Pratchett

et al. 2016

Rev Fish Biol Fisheries

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Spawning behavior and interspecific breeding in three Japanese greenlings (Hexagrammidae)

Cited by 32 publications

References 7 publications

The disruption of habitat isolation among threeHexagrammosspecies by artificial habitat alterations that create mosaic‐habitat

The disruption of habitat isolation among threeHexagrammosspecies by artificial habitat alterations that create mosaic‐habitat

Origins of two hemiclonal hybrids among three Hexagrammos species (Teleostei: Hexagrammidae): genetic diversification through host switching

The importance of ecological and behavioural data in studies of hybridisation among marine fishes

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