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Article
Open AccessThe past, present, and a future for native charr in Japan
Charrs (Salvelinus) reach their southernmost distribution in Japan, and are uniquely adapted to the short, steep streams of this island archipelago. Southern Asian Dolly Varden (Salvelinus curilus) occur only in ...
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Article
Parasites either reduce or increase host vulnerability to fishing: a case study of a parasitic copepod and its salmonid host
Parasites generally increase host vulnerability to predators via host manipulation for trophic transmission and reduction of host activities. Predators also select prey depending on the parasite infection stat...
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Article
No apparent effects of the buccal cavity attaching parasite, Salmincola sp. (Copepoda: Lernaeopodidae), on a stream salmonid: a mark-recapture study
We evaluated the effects of a buccal cavity attaching Salmincola sp. on white-spotted charr Salvelinus leucomaenis by mark-recapture method to compare body condition, growth, and apparent survival within a headwa...
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Article
Local factors affecting winter habitat use of non-native rainbow trout in a boreal stream in northern Japan
Despite its potential use for population control, the winter ecology of nonnative fishes is still poorly understood due to the difficulty of conducting field surveys. In this study, we investigated the winter ...
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Article
Open AccessComparing the gut microbiome along the gastrointestinal tract of three sympatric species of wild rodents
Host–microbe interactions within the gastrointestinal tract (GIT) play a pivotal role in sha** host physiology, ecology, and life history. However, these interactions vary across gut regions due to changes i...
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Article
Comparison of multiple behavioral traits between urban and rural squirrels
Recent rapid urbanization has imposed novel challenges to animals. Urban animals alter their behaviors such as increased boldness, exploration, and aggressiveness to cope with anthropogenic disturbance. Howeve...
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Article
Are bolder individuals more likely to choose heterospecific mates? A test in cyprinid fishes
Mating between different species is ubiquitous in nature. While environmental conditions and population density have been shown to affect the occurrence of heterospecific matings, much less is known about the ...
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Article
Visual preference of males for conspecific mates in mutually ornamented fish: possible support for the species recognition hypothesis
Because sexual selection typically acts on males, the evolution of conspicuous ornamentation in females has been insufficiently studied. Genetic correlation between the sexes and sexual or social selection on ...
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Article
Open AccessCorrection to: Web image search revealed large-scale variations in breeding season and nuptial coloration in a mutually ornamented fish, Tribolodon hakonensis
The article “Web image search revealed large-scale variations in breeding season and nuptial coloration in a mutually ornamented fish.
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Article
Open AccessSeasonal change in sexual differences in nestling size and survival: a framework to evaluate sex-dependent environmental sensitivity in the wild
Sexual size dimorphism (SSD) occurs in a wide range of species in birds and other animals, but the magnitude of SSD often varies with environmental conditions. In general, in the developmental stages, the larg...
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Article
Facultative multiple breeding as a female conditional strategy in Japanese tits: partner’s quality affects the initiation of second clutches
Multiple breeding within the same season is a typical reproductive strategy among short-lived species. Despite the apparent increase in the number of offspring, not all individuals become multiple breeders in ...
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Article
No reduction of hatching rates among F1 hybrids of naturally hybridizing three Far Eastern daces, genus Tribolodon (Cypriniformes, Cyprinidae)
Egg hatching rates of F1 hybrids among three fishes, Japanese dace Tribolodon hakonensis, Pacific redfin T. brandtii, and rosyface dace T. sachalinensis, were compared with pure crosses. They are highly divergent...
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Can Charismatic Megafauna Be Surrogate Species for Biodiversity Conservation? Mechanisms and a Test Using Citizen Data and a Hierarchical Community Model
Charismatic megafauna are a conservation concern and a flagship of conservation for many other species in the practice of biodiversity conservation. However, some studies support the roles of charismatic megaf...
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Article
Usefulness and limitation of a tiny light-temperature logger to monitor daily activity levels of arboreal squirrels in temperate areas
Owing to recent advances in technology, biologging has revealed in-depth animal behavior at a level of detail that previously could not be obtained. However, previous studies were limited to relatively large s...
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Article
Mass immigration of juvenile fishes into a small, once-dried tributary demonstrates the importance of remnant tributaries as wintering habitats
The winter ecology of stream fishes is still poorly understood, especially in non-salmonid species. A small tributary (<4 m in width, <1 km in length) of the Otofuke River (central Hokkaido, northern Japan) de...
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Article
Open AccessWeb image search revealed large-scale variations in breeding season and nuptial coloration in a mutually ornamented fish, Tribolodon hakonensis
Geographic variations in reproductive traits are important for evolutionary biology, but often difficult to investigate because of the need for a large-scale survey and the ephemeral nature of secondary sexual...
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Article
High frequency of mating without egg release in highly promiscuous nonparasitic lamprey Lethenteron kessleri
Nonparasitic lampreys are highly promiscuous: a single female can mate over several dozen times with multiple males. It remains unknown why females mate so frequently despite presumed costs from an elongated s...
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Article
Extreme winter aggregation of invasive rainbow trout in small tributaries: implications for effective control
Because of their high economic and recreational value, salmonids have been extensively introduced worldwide and are responsible for significant impacts on native ecosystems. However, effective methods for cont...
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Article
Temporal change in the distribution and composition of native, introduced, and hybrid charrs in northern Japan
Introductions of non-native species have caused various negative impacts on native species and their ecosystems. Hybridization is particularly prevalent among closely related species, and can result in displac...
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Article
Scale dependency of two endangered charismatic species as biodiversity surrogates
Charismatic megafauna have been used as icons and financial drivers of conservation efforts worldwide given that they are useful surrogates for biodiversity in general. However, tests of this premise have been...
