Osamu Kagawa

Osamu Kagawa
University of Tsukuba · College of Biological Sciences

Doctor of Philosophy

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12
Publications
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48
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Introduction
Skills and Expertise

Publications

Publications (12)
Preprint
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Accumulating information on the distribution of symbionts and their host species is important for studying how the symbionts have diversified. Pseudocladophora conchopheria is a green alga that grows on the shells of specific intertidal gastropods distributed in the Japanese archipelago, Ryukyu islands and Southern part of the Korean Peninsula. We...
Article
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Host shifts represent the advancement of a novel niche and often lead to speciation in symbionts. However, its mechanisms are not well understood. Here, we focused on the alga Pseudocladophora conchopheria growing on the shells of intertidal snails. Previous surveys have shown that the alga has host specificity-only attaching to the shell of Lunell...
Article
East Asia, specifically the Japanese Archipelago, is a biodiversity hotspot of both vertebrates and invertebrates. Mollusks represent a burst of species diversity in this region due to the effects of biotic and abiotic factors on their morphological traits, such as shell shape and size. However, the evolutionary history of terrestrial slugs in East...
Article
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Knowing how the present distribution of organisms was formed is an essential issue in evolutionary ecology. Recently, the distribution of organisms on Earth has been significantly changed by human-mediated dispersal due to globalization. Therefore, significant attention has been paid to such processes. However, although humankind has taken consider...
Article
Revealing the species and lineage diversity of a taxon is important for many biological studies of wildlife. In recent decades, DNA-based approaches have been widely utilised to elucidate the diversity of taxa, especially those that are difficult to distinguish based on morphological traits. This study focused on freshwater clams (Sphaeriidae) in J...
Article
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Reliable identification of species is important for protecting native ecosystems against the invasion of non-native species. DNA barcoding using molecular markers, such as the mitochondrial cytochrome oxidase subunit 1 (COI) gene, helps researchers distinguish species. In this study, we focused on introduced veronicellid slugs in the Ryukyu Islands...
Article
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In this study, we clarify the classification of museum specimens of the family Viviparidae, which is composed of six species/subspecies in Japan, including three endangered species. We examined Viviparus sclateri specimens from the Tomotaro Iwakawa collection (1855-1933) in the National Museum of Nature and Science, Tokyo. The Iwakawa's collection...
Article
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Environmental factors promote symbiosis, but its mechanism is not yet well understood. The alga Pseudocladophora conchopheria grows only on the shell of an intertidal gastropod Lunella correensis , and these species have a close symbiotic relationship which the alga reduces heat stress of the gastropod. In collaboration with general public, we inve...
Article
Freshwater mollusks often show high intraspecific variability in shell morphology, which may cause incongruences between molecular phylogeny and morphology-based species taxonomy. However, it remains unclear how morphological variations in freshwater snails are associated with different habitats such as rivers, ponds, and lakes. In the present stud...
Article
Positive interactions are known to play important roles in ecological divergence but have received less attention than negative interactions in studies on intertidal communities. Here, we show that growth of the mat‐forming green alga Pseudocladophora conchopheria on the shells of a intertidal gastropod (Lunella coreensis) provides them with benefi...

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