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21 results on '"Kuranishi, Ryoichi B."'

1. Evolution of Opsin Genes in Caddisflies (Insecta: Trichoptera).

Author

Powell, Ashlyn, Heckenhauer, Jacqueline, Pauls, Steffen U, Ríos-Touma, Blanca, Kuranishi, Ryoichi B, Holzenthal, Ralph W, Razuri-Gonzales, Ernesto, Bybee, Seth, and Frandsen, Paul B

Subjects
CADDISFLIES, GENE families, INSECT evolution, OPSINS, WHOLE genome sequencing
Abstract

Insects have evolved complex and diverse visual systems in which light-sensing protein molecules called "opsins" couple with a chromophore to form photopigments. Insect photopigments group into three major gene families based on wavelength sensitivity: long wavelength (LW), short wavelength (SW), and ultraviolet wavelength (UV). In this study, we identified 123 opsin sequences from whole-genome assemblies across 25 caddisfly species (Insecta: Trichoptera). We discovered the LW opsins have the most diversity across species and form two separate clades in the opsin gene tree. Conversely, we observed a loss of the SW opsin in half of the trichopteran species in this study, which might be associated with the fact that caddisflies are active during low-light conditions. Lastly, we found a single copy of the UV opsin in all the species in this study, with one exception: Athripsodes cinereus has two copies of the UV opsin and resides within a clade of caddisflies with colorful wing patterns. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Evolution of Opsin Genes in Caddisflies (Insecta: Trichoptera)

Author

Powell, Ashlyn, primary, Heckenhauer, Jacqueline, additional, Pauls, Steffen U., additional, Ríos-Touma, Blanca, additional, Kuranishi, Ryoichi B., additional, Holzenthal, Ralph W., additional, Razuri-Gonzales, Ernesto, additional, Bybee, Seth, additional, and Frandsen, Paul B., additional

Published
2023
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8. Long-read HiFi sequencing correctly assembles repetitive heavy fibroin silk genes in new moth and caddisfly genomes

Author

Kawahara, Akito Y., primary, Storer, Caroline G., additional, Markee, Amanda, additional, Heckenhauer, Jacqueline, additional, Powell, Ashlyn, additional, Plotkin, David, additional, Hotaling, Scott, additional, Cleland, Timothy P., additional, Dikow, Rebecca B., additional, Dikow, Torsten, additional, Kuranishi, Ryoichi B., additional, Messcher, Rebeccah, additional, Pauls, Steffen U., additional, Stewart, Russell J., additional, Tojo, Koji, additional, and Frandsen, Paul B., additional

Published
2022
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14. Reproductive Biology and Adaptability of the Invasive Alien Freshwater Amphipod Crangonyx floridanus (Crustacea: Amphipoda, Crangonyctidae)

Author

Tojo, Koji, Tanaka, Yoshiki, Kuranishi, Ryoichi B., and Kanada, Shoji

Subjects
reproduction, Crangonyx floridanus, alien species, freshwater amphipod, temperature adaptability
Abstract

We studied the reproductive biology and adaptability of the alien freshwater crangonyctid amphipod Crangonyx floridanus, currently inhabiting a large portion of Japan, both in the field and under controlled laboratory conditions. In the Chikuma River population of this alien amphipod, egg-bearing individuals were found throughout the year. In terms of egg maturation cycle, egg development (during embryogenesis), and egg count per ovipositional cycle, these amphipods display a very efficient reproductive system. This study also established their adaptability to a wide range of water temperatures (primarily 4-20 degrees C, however in some cases, these individuals are able to survive at up to 30 degrees C). C. floridanus's strong capacity to adapt to broad and variable environmental conditions is certainly contributing to its high rate of population increase, and rapid dispersion throughout Japan., Article, ZOOLOGICAL SCIENCE. 27(6):522-527 (2010)

Published
2010

16. Rapid expansion of the distributional range and the population genetic structure of the freshwater amphipod Crangonyx floridanus in Japan

Author

Nagakubo, Asako, Sekine, Kazuki, Tanaka, Yoshiki, Kuranishi, Ryoichi B., Kanada, Shoji, Tojo, Koji; OCcebhLh, Nagakubo, Asako, Sekine, Kazuki, Tanaka, Yoshiki, Kuranishi, Ryoichi B., Kanada, Shoji, and Tojo, Koji; OCcebhLh

Abstract

The freshwater amphipod Crangonyx floridanus (Amphipoda: Crangonyctidae) is considered to have been recently introduced from North America to Japan, and the recorded sites at which it has been collected now cover nearly all of Japan except for the northern part. In this study, we surveyed further areas outside of its known distribution range, and examined the population genetic structure and the phylogenetic relationships between Japanese and North American populations of this species based on nuclear (18S rRNA) and mitochondrial (COI) DNA sequences. We found that this amphipod has already reached Hokkaido, northernmost Japan, which suggests that it has undergone rapid expansion in a pattern of concentric circles from the central part of Japan. Genetic analysis showed that the Japanese population is genetically homogeneous, in contrast to the genetic diversification of this species seen in North American Crangonyx populations. The process of introducing, establishing, and expanding this amphipod in Japan may be explained as follows. A limited number of individuals from a North American native population were probably inadvertently introduced and established somewhere within the Kanto region. The local population size then increased and its distribution range expanded rapidly across Japan.

Published
2012

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