Population Structure and Evolution after Speciation of the Hokkaido Salamander (Hynobius retardatus)

Matsunami, Masatoshi; Igawa, Takeshi; Michimae, Hirofumi; Miura, Toru; Nishimura, Kinya

doi:10.1371/journal.pone.0156815

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…After islands connection and the present Hokkaido Island was formed, H . retardatus expanded into eastern Hokkaido (0.72–0.32 million years ago: Azuma et al, 2013; Matsunami et al, 2016) and might drive away S . keyserlingii into eastern marshlands which were not suitable habitat for H .…”

Section: Discussionmentioning

confidence: 99%

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Ecological niche differentiation of two salamanders (Caudata: Hynobiidae) from Hokkaido Island, Japan

Tran

Terui²,

Nomoto

et al. 2020

Ecological Research

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Understanding environmental factor determining ecological niche is very important to elucidating the distribution of species, and also revealing how closely related species are able to coexist in a particular region. Here, we applied ecological niche modeling to develop the ecological niches of two hynobiid salamanders: Salamandrella keyserlingii and Hynobius retardatus which are co‐occurring on Hokkaido Island, Japan. We, then, tested hypotheses about ecological niche differentiation between the two species. Our models showed that the potential distribution of S. keyserlingii was strictly limited to a small area at Kushiro Marsh, while the suitable distribution of H. retardatus was covered widely on Hokkaido Island. The results revealed the little geographic range overlap and the differentiation on the requirements of the ecological condition between the two species. We found nonequivalent niches in identity tests and counterintuitive results in background tests, indicating that S. keyserlingii has used a habitat subset of H. retardatus. Overall, our result contributed to understand the ecological niche space, and suggest the historical formation of these species on Hokkaido Island. The models can also be used to aid conservation purposes, such as habitat management, planning and designation of protected areas.

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Section: Discussionmentioning

confidence: 99%

“…The land area in (a) was modified from Yahata (2002) at about 1.5 million years ago, and in (b) was modified from Davison, Chiba, Barton, and Clarke (2005) at 20,000 years ago. The arrows indicate the direction movement, which were modified from Matsunami, Igawa, Michimae, Miura, and Nishimura (2016)…”

Section: Discussionmentioning

confidence: 99%

Ecological niche differentiation of two salamanders (Caudata: Hynobiidae) from Hokkaido Island, Japan

Tran

Terui²,

Nomoto

et al. 2020

Ecological Research

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“…These findings imply the existence of genetic variation among local populations. Phylogeographic studies have also identified genetic differences and phylogenetic relationships among local populations (Azuma, Hangui, Wakahara, & Michimae, 2013;Matsunami, Igawa, Michimae, Miura, & Nishimura, 2016;Michimae, 2006Michimae, , 2007Michimae et al, 2009).…”

Section: Interaction-driven Expression Of the Cannibalism Reaction mentioning

confidence: 99%

An interaction‐driven cannibalistic reaction norm

Nishimura

2018

Ecology and Evolution

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AbstractsCannibalism is induced in larval‐stage populations of the Hokkaido salamander, Hynobius retardatus, under the control of a cannibalism reaction norm. Here, I examined phenotypic expression under the cannibalism reaction norm, and how the induction of a cannibalistic morph under the norm leads to populational morphological diversification. I conducted a set of experiments in which density was manipulated to be either low or high. In the high‐density treatment, the populations become dimorphic with some individuals developing into the cannibal morph type. I performed an exploratory analysis based on geometric morphometrics and showed that shape characteristics differed between not only cannibal and noncannibal morph types in the high‐density treatment but also between those morph types and the solitary morph type in the low‐density treatment. Size and shape of cannibal and noncannibal individuals were found to be located at either end of a continuum of expression following a unique size–shape integration rule that was different from the rule governing the size and shape variations of the solitary morph type. This result implies that the high‐density‐driven inducible morphology of an individual is governed by a common integration rule during the development of dimorphism under the control of the cannibalism reaction norm. Phenotypic expression under the cannibalism reaction norm is driven not only by population density but also by social interactions among the members of a population: variation in the populational expression of dimorphism is associated with contingent social interaction events among population members. The induced cannibalistic morph thus reflects not only by contest‐type exploitative competition but also interference competition.

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Identification of camel species in food products by a polymerase chain reaction-lateral flow immunoassay

Zhao

Liu

et al. 2020

Food Chemistry

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Population Structure and Evolution after Speciation of the Hokkaido Salamander (Hynobius retardatus)

Cited by 3 publications

References 47 publications

Ecological niche differentiation of two salamanders (Caudata: Hynobiidae) from Hokkaido Island, Japan

Ecological niche differentiation of two salamanders (Caudata: Hynobiidae) from Hokkaido Island, Japan

An interaction‐driven cannibalistic reaction norm

Identification of camel species in food products by a polymerase chain reaction-lateral flow immunoassay

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