8 Works

Accumulation of deleterious mutations in landlocked threespine stickleback populations

Jun Kitano, Kohta Yoshida, Mark Ravinet, Takashi Makino, Atsushi Toyoda, Tomoyuki Kokita & Seiichi Mori
Colonization of new habitats often reduces population sizes and may result in the accumulation of deleterious mutations by genetic drift. Compared to the genomic basis for adaptation to new environments, genome-wide analysis of deleterious mutations in isolated populations remains limited. In the present study, we investigated the accumulation of deleterious mutations in five endangered freshwater populations of threespine stickleback (Gasterosteus aculeatus) in the central part of the mainland of Japan. Using whole genome resequencing data,...

Data from: Combining niche-shift and population genetic analyses predicts rapid phenotypic evolution during invasion

Erik E. Sotka, Aaron W. Baumgardner, Paige M. Bippus, Claude Destombe, Elizabeth A. Duermit, Hikaru Endo, Ben A. Flanagan, Mits Kamiya, Lauren E. Lees, Courtney J. Murren, Masahiro Nakaoka, Sarah J. Shainker, Allan E. Strand, Ryuta Terada, Myriam Valero, Florian Weinberger, Stacy A. Krueger-Hadfield & Christophe Destombe
Rapid evolution of non-native species can facilitate invasion success, but recent reviews indicate that such microevolution rarely yields expansion of the climatic niche in the introduced habitats. However, because some invasions originate from a geographically restricted portion of the native species range and its climatic niche, it is possible that the frequency, direction and magnitude of phenotypic evolution during invasion has been underestimated. We explored the utility of niche-shift analyses in the red seaweed Gracilaria...

CT data and 3D models associated with: Palaeoneurology of the Early Cretaceous iguanodont Proa valdearinnoensis and its bearing on the parallel developments of cognitive abilities in theropod and ornithopod dinosaurs

Stephan Lautenschlager, Knoll Fabien, Kawabe Soichiro, Gloria Martínez, Eduardo Espílez, Luis Mampel & Luis Alcalá
Proa valdearinnoensis is a relatively large-headed and stocky iguanodontian dinosaur from the latest Early Cretaceous of Spain. Its braincase is known from three specimens. Similar to that of other dinosaurs, it shows a mosaic ossification pattern in which most of the bones seem to have fused together indistinguishably while a few bones (frontoparietal, basioccipital) might have remained loosely attached. The endocasts of the three specimens are described based on CT data and digital reconstructions. They...

Data from: A key metabolic gene for recurrent freshwater colonization and radiation in fishes

Asano Ishikawa, Naoki Kabeya, Koki Ikeya, Ryo Kakioka, Jennifer N. Cech, Naoki Osada, Miguel C. Leal, Jun Inoue, Manabu Kume, Atsushi Toyoda, Ayumi Tezuka, Atsushi J. Nagano, Yo Y. Yamasaki, Yuto Suzuki, Tomoyuki Kokita, Hiroshi Takahashi, Kay Lucek, David Marques, Yusuke Takehana, Kiyoshi Naruse, Seiichi Mori, Oscar Monroig, Nemiah Ladd, Carsten J. Schubert, Blake Matthews … & Jun Kitano
Colonization of new ecological niches has triggered large adaptive radiations. Although some lineages have made use of such opportunities, not all do so. The factors causing this variation among lineages are largely unknown. Here, we show that deficiency in docosahexaenoic acid (DHA), an essential ω-3 fatty acid, can constrain freshwater colonization by marine fishes. Our genomic analyses revealed multiple independent duplications of the fatty acid desaturase gene Fads2 in stickleback lineages that subsequently colonized and...

Gudgeon fish with and without genetically determined countershading coexist in heterogeneous littoral environments of an ancient lake

Tomoyuki Kokita
Countershading, characterized by a darker dorsal surface and lighter ventral surface, is common among many animals. This dorsoventral pigment polarity is often thought to be adaptive coloration for camouflage. By contrast, non-countershaded (melanistic) morphs often occur within a species due to genetic color polymorphism in terrestrial animals. However, the polymorphism with either countershaded or melanistic morphs is poorly known in wild aquatic animals. This study explored the genetic nature of diverged color morphs of a...

Data from: The genetic architecture of growth rate in juvenile Takifugu species.

Sho Hosoya, Wataru Kai, Masashi Fujita, Kadoo Miyaki, Hiroaki Suetake, Yuzuru Suzuki & Kiyoshi Kikuchi
Closely related species have often evolved dramatic differences in body size. Takifugu rubripes (fugu) is a large marine pufferfish whose genome has been sequenced, whereas T. niphobles is the smallest species among Takifugu. We show that, unsurprisingly, the juvenile growth rate of T. rubripes is higher than that of T. niphobles in a laboratory setting. We produced F2 progenies of their F1 hybrids and found one quantitative trait locus (QTL) significantly associated with variation in...

Data from: Molecular signatures of lineage-specific adaptive evolution in a unique sea basin: the example of an anadromous goby Leucopsarion petersii

Tomoyuki Kokita, Sayaka Takahashi & Hiroki Kumada
Climate changes on various time scales often shape genetic novelty and adaptive variation in many biotas. We explored molecular signatures of directional selection in populations of the ice goby Leucopsarion petersii inhabiting a unique sea basin, the Sea of Japan, where a wide variety of environments existed in the Pleistocene in relation to shifts in sea level by repeated glaciations. This species consisted of two historically allopatric lineages, the Japan Sea (JS) and Pacific Ocean...

Data from: Genomic architecture of habitat-related divergence and signature of directional selection in the body shapes of Gnathopogon fishes

Ryo Kakioka, Tomoyuki Kokita, Hiroki Kumada, Katsutoshi Watanabe & Noboru Okuda
Evolution of ecomorphologically relevant traits such as body shapes is important to colonize and persist in a novel environment. Habitat-related adaptive divergence of these traits is therefore common among animals. We studied the genomic architecture of habitat-related divergence in the body shape of Gnathopogon fishes, a novel example of lake–stream ecomorphological divergence, and tested for the action of directional selection on body shape differentiation. Compared to stream-dwelling Gnathopogon elongatus, the sister species Gnathopogon caerulescens, exclusively...

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  • 2012

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  • Fukui Prefectural University
  • Gifu Kyoritsu University
  • Hokkaido University
  • National Institute of Genetics
  • College of Charleston
  • Fundacion Agencia Aragonesa para la Investigacion y el Desarrollo
  • Fred Hutchinson Cancer Research Center
  • University of Alabama at Birmingham
  • Swiss Federal Institute of Aquatic Science and Technology
  • Ryukoku University