Homing behaviour of juvenile coho salmon (<i>Oncorhynchus kisutch</i>) within an off‐channel habitat

Minakawa, Noboru; Kraft, G. F.

doi:10.1111/j.1600-0633.2005.00093.x

Cited by 4 publications

(4 citation statements)

References 31 publications

(38 reference statements)

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“…5 ). This signal of sympatry is consistent with data from studies showing that salmonids show strong site fidelity (e.g., Minakawa and Kraft 2005 ; Dittman et al. 2010 ), which can lead to establishment of local pathogen strains, for example, in IHN virus ( Kurath et al.…”

Section: Discussionsupporting

confidence: 88%

Transcriptome-Wide Comparisons and Virulence Gene Polymorphisms of Host-Associated Genotypes of the Cnidarian Parasite Ceratonova shasta in Salmonids

Alama-Bermejo

Meyer

Holzer

et al. 2020

Genome Biology and Evolution

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Ceratonova shasta is an important myxozoan pathogen affecting the health of salmonid fishes in the Pacific Northwest of North America. C. shasta exists as a complex of host-specific genotypes, some with low to moderate virulence, and one that causes a profound, lethal infection in susceptible hosts. High throughput sequencing methods are powerful tools for discovering the genetic basis of these host/virulence differences, but deep sequencing of myxozoans has been challenging due to extremely fast molecular evolution of this group, yielding strongly divergent sequences that are difficult to identify, and unavoidable host contamination. We designed and optimized different bioinformatic pipelines to address these challenges. We obtained a unique set of comprehensive, host-free myxozoan RNA-seq data from C. shasta genotypes of varying virulence from different salmonid hosts. Analyses of transcriptome-wide genetic distances and maximum likelihood multigene phylogenies elucidated the evolutionary relationship between lineages and demonstrated the limited resolution of the established Internal Transcribed Spacer marker for C. shasta genotype identification, as this marker fails to differentiate between biologically distinct genotype II lineages from coho salmon and rainbow trout. We further analyzed the datasets based on polymorphisms in two gene groups related to virulence: cell migration and proteolytic enzymes including their inhibitors. The developed SNP-calling pipeline identified polymorphisms between genotypes and demonstrated that variations in both motility and protease genes were associated with different levels of virulence of C. shasta in its salmonid hosts. The prospective use of proteolytic enzymes as promising candidates for targeted interventions against myxozoans in aquaculture is discussed. We developed host-free transcriptomes of a myxozoan model organism from strains that exhibited different degrees of virulence, as a unique source of data that will foster functional gene analyses and serve as a base for the development of potential therapeutics for efficient control of these parasites.

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Section: Discussionsupporting

confidence: 88%

Transcriptome-Wide Comparisons and Virulence Gene Polymorphisms of Host-Associated Genotypes of the Cnidarian Parasite Ceratonova shasta in Salmonids

Alama-Bermejo

Meyer

Holzer

et al. 2020

Genome Biology and Evolution

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“…juveniles are fairly stationary during the juvenile life stage (Bell et al , ) and it is often assumed that deviations from strict site‐fidelity in juvenile O . kisutch are caused by forced migration (Bell et al , ; Minakawa & Kraft, ). The results of this study indicate that variability in habitat use during emigration may be a normal characteristic of interior anadromous Oncorhynchus spp.…”

Section: Discussionmentioning

confidence: 99%

Freshwater movement patterns by juvenile Pacific salmon Oncorhynchus spp. before they migrate to the ocean: Oh the places you'll go!

Shrimpton

Warren

Todd³

et al. 2014

Journal of Fish Biology

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Juvenile movement patterns for coho salmon Oncorhynchus kisutch and Chinook salmon Oncorhynchus tshawytscha from two large interior rivers of British Columbia, Canada, were examined. Otoliths from post-spawned fishes were collected on spawning grounds and elemental signatures were determined through transects from sectioned otoliths using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Large variations in otolith elemental signatures were found during the freshwater life stage indicative of movement downstream to rivers and tributaries that differed in elemental signature. This study highlights that downstream movements occur before migration to the ocean during the parr-smolt transformation. Extensive downstream movements of parr appear to be a successful life-history strategy based on variations observed in the otolith elemental signatures of spawners. Movements downstream in parr and the remarkable homing ability of adults also suggest that imprinting to natal streams must occur prior to the parr-smolt transformation.

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“…seasons (Barthem & Goulding 1997;Carolsfeld et al 2003), mainly of P. corruscans (Agostinho et al 2003;Resende 2003), the magnitude and geographical scale of genetic differentiation found in the present study only can be explained if P. corruscans have a homing behaviour. Homing, i.e., the returning to a place formerly occupied instead of going to other equally probable places (Gerking 1959), has been described for several anadromous species, mainly salmonids (Dittman & Quinn 1996;Minakawa & Kraft 2005;Neville et al 2006), but also for freshwater (Crook 2004) and some marine species, such as the blacktip shark (Keeney et al 2005) and the coral reef cardinalfish (Døving et al 2006). The hypothesis of occurrence of homing in P. corruscans was suggested by Godinho et al (2007).…”

Section: Genetic Population Structurementioning

confidence: 99%

Genetic structure of the migratory catfish Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) suggests homing behaviour

Pereira

Foresti

Oliveira

2009

Ecology of Freshwater Fish

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– Pseudoplatystoma corruscans is distributed widely in the La Plata Basin in Brazil, where it is a very important species because of its high commercial value and ecological role as a voracious predator. This species undertakes long migrations during the dry and rainy seasons to feed and reproduce, respectively. In this study, we analysed seven microsatellite loci to test the hypotheses of the existence of a single panmictic population of P. corruscans in the La Plata Basin. All microsatellites analysed were highly polymorphic with the number of alleles per locus ranging from seven (Pcor28) to 30 (Pcor10). Across all samples, 107 alleles were detected. Thirty alleles were private, i.e., found in only one sample. Highly significant genetic differentiation was observed among samples in three of the four analyses performed: FST (from 0.03435 to 0.16349, P < 0.05), Analysis of molecular variance (amova)FST = 8.25% (P < 0.0001) and amovaRST = 9.72% (P < 0.0001). A microsatellite multilocus Bayesian assignment test with the programme structure confirmed the division of the fishes into six groups largely concurrent with main branches on a population neighbour‐joining tree. The obtained results rejected the panmixia hypothesis. On the other hand, the documented long‐distance movements of P. corruscans and the geographical scale of genetic differentiation found in this study indicate a strong tendency for fish of this species to utilise their natal nursery regions for reproduction, which represents the first demonstrated example of homing in a freshwater catfish in South America.

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Homing behaviour of juvenile coho salmon (Oncorhynchus kisutch) within an off‐channel habitat

Abstract: LetterHoming behaviour of juvenile coho salmon (Oncorhynchus kisutch) within an off-channel habitat Un resumen en españ ol se incluye detrás del texto principal de este articulo.

Cited by 4 publications

References 31 publications

Transcriptome-Wide Comparisons and Virulence Gene Polymorphisms of Host-Associated Genotypes of the Cnidarian Parasite Ceratonova shasta in Salmonids

Transcriptome-Wide Comparisons and Virulence Gene Polymorphisms of Host-Associated Genotypes of the Cnidarian Parasite Ceratonova shasta in Salmonids

Freshwater movement patterns by juvenile Pacific salmon Oncorhynchus spp. before they migrate to the ocean: Oh the places you'll go!

Genetic structure of the migratory catfish Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) suggests homing behaviour

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