Search Results - "Hasegawa, Koh"

Invasions of rainbow trout and brown trout in Japan: A comparison of invasiveness and impact on native species by Hasegawa, Koh

“…Many species of salmonids have been stocked into waters outside of their native range. The invasiveness and impact of these species on native species varies…”
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The density dependent interspecific competition between nonnative salmonids, rainbow trout and brown trout by Hasegawa, Koh

“…Interspecific interactions play a key role in determining species assemblages when nonnative species are introduced. In the Chitose River system, Hokkaido,…”
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Domestication of captive-bred masu salmon Oncorhynchus masou masou (Salmonidae) leads to a significant decrease in numbers of lateral line organs by Nakae, Masanori, Hasegawa, Koh, Miyamoto, Kouta

“…Because captive-bred animals gradually adapt to artificial rearing environments due to evolving life history traits, such individuals sometimes show lessened…”
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Pulsed supplies of small fish facilitate time-limited intraguild predation in salmon-stocked streams by Hasegawa, Koh, Fukui, Sho

“…Pulsed supplies of prey generally increase predator food intake. However, it is unclear whether this holds true when predators and pulsed prey are in the same…”
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Wild masu salmon is outcompeted by hatchery masu salmon, a native invader, rather than brown trout, a nonnative invader by Hasegawa, Koh, Nakashima, Ayumi

“…Artificially grown native species are released into natural environments to increase biological resources or to recover threatened populations. Such stocks…”
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Temperature‐dependent competition between juvenile salmonids in small streams by Watz, Johan, Otsuki, Yasuhiko, Nagatsuka, Kenta, Hasegawa, Koh, Koizumi, Itsuro

“…Biotic interactions affect species distributions, and environmental factors that influence these interactions can play a key role when range shifts in response…”
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DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry by Hasegawa, Koh, Yano, Yutaka, Honda, Kentaro, Ogura, Yuhei

“…Increases in prey population size can affect the physiology and ecology of upper-trophic level organisms. This phenomenon is known as a bottom-up effect. For…”
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Are hatchery chum salmon fry a native invader? Direct and indirect effects of stocking salmon fry on stream organisms by Hasegawa, Koh, Ohta, Tamihisa, Takahashi, Satoru

“…Native species may show invasiveness toward a recipient ecosystem through increases in abundance as a result of artificial stocking events. Salmonid species…”
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The lateral line system and its innervation in the masu salmon Oncorhynchus masou masou (Salmonidae) by Nakae, Masanori, Hasegawa, Koh

“…The lateral line system and its innervation were examined in the masu salmon Oncorhynchus masou masou . The species has 8 cephalic canals (supraorbital,…”
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Temporal trends in geographic clines of chum salmon reproductive traits associated with global warming and hatchery programmes by Hasegawa, Koh, Okamoto, Yasutaka, Morita, Kentaro

“…Geographic clines in life‐history traits are often recognized as adaptations to the associated transitional environments. As life‐history traits evolve in…”
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The past, present, and a future for native charr in Japan by Fausch, Kurt D., Morita, Kentaro, Tsuboi, Jun-ichi, Kanno, Yoichiro, Yamamoto, Shoichiro, Kishi, Daisuke, Dunham, Jason B., Koizumi, Itsuro, Hasegawa, Koh, Inoue, Mikio, Sato, Takuya, Kitano, Satoshi

“…Charrs ( Salvelinus ) reach their southernmost distribution in Japan, and are uniquely adapted to the short, steep streams of this island archipelago. Southern…”
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Effects of domestication and captive breeding on reaction to moving objects: implications for avoidance behaviours of masu salmon Oncorhynchus masou by Hasegawa, Koh, Nakae, Masanori, Miyamoto, Kouta

“…Domestication and captive breeding can compromise the obstacle- and predator-avoidance capabilities of animals in the wild. Whereas previous studies only…”
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Microscale Environments along the Seaward Migration Route of Stocked Chum Salmon Fry by Hasegawa, Koh, Takahashi, Satoru

“…The microscale environment (e.g., current velocity) along the migratory route of aquatic organisms may directly affect their performance (e.g., migration speed…”
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Census and effective population sizes of white-spotted charr (Salvelinus leucomaenis) in a fragmented landscape by Yamamoto, Shoichiro, Kubota, Hitoshi, Hasegawa, Koh, Nakamura, Tomoyuki

“…Several habitat models have been proposed to predict population size for stream fishes and to guide habitat assessment and monitoring techniques. However, most…”
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Replacement of nonnative rainbow trout by nonnative brown trout in the Chitose River system, Hokkaido, northern Japan by Hasegawa, Koh

“…In this study, evidence for interspecific interaction was provided by comparing distribution patterns of nonnative rainbow trout Onchorhynchus mykiss and brown…”
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Brown trout in Japan − introduction history, distribution and genetic structure by Berrebi, Patrick, Marić, Saša, Snoj, Aleš, Hasegawa, Koh

“…Brown trout Salmo trutta L. lives mainly in European rivers and is also bred in hatcheries for fishery purposes. Since the end of 19th century it has been…”
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Food habits of introduced brown trout and native masu salmon are influenced by seasonal and locational prey availability by Hasegawa, Koh, Yamazaki, Chitose, Ohta, Tamihisa, Ohkuma, Kazumasa

“…A knowledge of food habits is important for evaluating interspecific competition and predation between sympatric species. Data on food availability should be…”
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Hybridization between native white-spotted charr and nonnative brook trout in the upper Sorachi River, Hokkaido, Japan by Kitano, Satoshi, Ohdachi, Satoshi, Koizumi, Itsuro, Hasegawa, Koh

“…Invasion status and impacts of nonnative brook trout ( Salvelinus fontinalis ) in a Hokkaido stream were investigated with field surveys and genetic analyses…”
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Distinguishing local growth from immigration-based size shifts for juvenile chum salmon communities in coastal Hokkaido, northern Japan by Hasegawa, Koh, Sato, Tomoki, Sasaki, Kei

“…The body size of juvenile fish is often used as an index of growth rate, which in turn is influenced by local habitat conditions. We evaluated the size and…”
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Exploring predators of Pacific salmon throughout their life history: the case of Japanese chum, pink, and masu salmon by Okado, Jumpei, Hasegawa, Koh

“…When, where, and what predators prey upon salmon is fundamental to understanding their mortality in a given region. We reviewed the available information about…”
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