Effects of body color luminance and behavioral characteristics on predation risk in salmonid fishes

Miyamoto, Kouta

doi:10.1007/s10750-015-2573-x

Cited by 11 publications

(4 citation statements)

References 34 publications

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“…It can be inferred that the probability of branches impairing the predator's movement (e.g., Frampton et al 1995;Babbit and Tanner 1998) was actually low, mainly because the branches were floating or suspended, enabling the white-spotted charr, which usually swims at the bottom, to move freely. Another explanation for the results of this study could be that the white-spotted charr's behavior was simply in line with their previously recorded behavior, mainly referring to their natural preference for higher structural complexity (Miyamoto 2016). That is why two bunches (0.2 m 2 per 1.0 m 2 of pond bottom) did not effectively mitigate predation, probably as a consequence of reduced refuge space for prey, whereby safe areas become saturated and prey are pushed out into the open where they are more vulnerable to predation (Forrester and Steele 2004).…”

Section: Discussionsupporting

confidence: 83%

“…Additionally, predator avoidance behavior might be more relevant in situations where the predatory style is pursuit, instead of ambush (Flynn and Ritz 1999). Previous reports suggested that juvenile masu salmon will use an artificial shelter as part of their hiding behavior when exposed to predation stimuli (Miyamoto 2016;Miyamoto and Araki 2020). Therefore, it is reasonable to assume that masu salmon often used structures for shelter in the current study as well.…”

Section: Discussionmentioning

confidence: 93%

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Artificially increased habitat complexity reduces predation-induced mortality for juvenile salmon in simplified environments

Miyamoto

Đorđević²,

Araki

2021

Environ Biol Fish

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Many river systems have been artificially modified for various reasons worldwide. Although simplified riverbeds due to artificial modifications often alter the species compositions and interactions, methods for mitigating habitat degradation in such rivers are underdeveloped. In this study, we evaluated the effects of tree branches on the survival of juvenile masu salmon Oncorhynchus masou under predation risk by piscivorous fish (White-spotted charr Salvelinus leucomaenis) in artificially simplified environments. We found that 0.4 m 2 or more of tree branches per 1.0 m 2 of artificial concrete pond doubled the survival of juvenile salmon for 20 days. In addition, body sizes of predator and prey did not have a significant effect on salmon survival, whereas the number of branches did in this experiment. These results indicate that adding structural complexity can mitigate predation pressure by piscivorous fish in artificially simplified environments. This study provides important guidelines for the management and restoration of suitable habitats for stream salmonids in artificially simplified environments where the main predators are piscivorous fish.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 93%

Artificially increased habitat complexity reduces predation-induced mortality for juvenile salmon in simplified environments

Miyamoto

Đorđević²,

Araki

2021

Environ Biol Fish

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“…Kahilainen et al (2016a) contrast the visual pigments in the eyes of deep and shallow water-living morphs of Arctic charr and European whitefish, and showed significant differences between species that logically equate to differences in visual capacity under different light regimes. In contrast, Miyamoto (2016) investigated the effect of skin colouration on predation risk in White-spotted charr, contrasting risk with that of other related species. This work showed a clear functional link between colouration and predation risk.…”

Section: Evolutionary Studiesmentioning

confidence: 99%

The role of Salvelinus in contemporary studies of evolution, trophic ecology and anthropogenic change

et al. 2016

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“…Colour patterns support differences in coping styles (Kittilsen et al, 2009; Brännäs et al, 2016) or in the physiological adjustments necessary to avoid predation and match with environmental variability (e.g. Miyamoto, 2016; Jacquin et al, 2017; Zastavniouk, Weir, & Fraser, 2017). In salmonids, pigmentation and colour are also known to interact with social hierarchies, to influence mate choice and affect fitness (e.g.…”

Section: Introductionmentioning

confidence: 99%

Spotting genome-wide pigmentation variation in a brown trout admixture context

Valette¹,

Leitwein

Lascaux³

et al. 2020

Preprint

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Colour and pigmentation variation attracted fish biologists for a while, but high-throughput genomic studies investigating the molecular basis of body pigmentation remain still limited to few species and conservation biology issues ignored. Using 75,684 SNPs, we investigated the genomic basis of pigmentation pattern variation among individuals of the Atlantic and Mediterranean clades of the brown trout (Salmo trutta), a polytypic species in which Atlantic hatchery individuals are commonly used to supplement local wild populations. Using redundancy analyses and genome-wide association studies, a set of 384 “colour patterning loci” (CPL) significantly correlated with pigmentation traits such as the number of red and black spots on flanks, but also the presence of a large black stain on the opercular bone was identified. CPLs map onto 35 out of 40 brown trout linkage groups indicating a polygenic basis to pigmentation patterns. They are mostly located in coding regions (43.4%) of 223 candidate genes, and correspond to GO-terms known to be involved in pigmentation (e.g. calcium and ion-binding, cell adhesion). Annotated genes especially include 24 candidates with known pigmentation effects (e.g. SOX10, PEML, SLC45A2), but also the Gap-junction Δ2 (GJD2) gene that was previously showed be differentially expressed in trout skin. Patterns of admixture were found significantly distinct when using either the full SNP data set or the set of CPLs, indicating that pigmentation patterns accessible to practitioners are not a reliable proxy of genome-wide admixture. Consequences for management are discussed.

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Effects of body color luminance and behavioral characteristics on predation risk in salmonid fishes

Cited by 11 publications

References 34 publications

Artificially increased habitat complexity reduces predation-induced mortality for juvenile salmon in simplified environments

Artificially increased habitat complexity reduces predation-induced mortality for juvenile salmon in simplified environments

The role of Salvelinus in contemporary studies of evolution, trophic ecology and anthropogenic change

Spotting genome-wide pigmentation variation in a brown trout admixture context

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