Evidence of parasite-mediated disruptive selection on genetic diversity in a wild fish population

The bigeye tuna (Thunnus obesus) is a migratory fish which can be found in the Atlantic, Indian and Pacific oceans. This fish has a commercial value and has been exploited worldwide including in Indonesia. The exploitation might affect the genetic diversity and population structure. The fact that the population stock resource is abundant and following fishing activities are increasing, study on population genetic and phylogeography canbe used as information to determine the status of the fish population based on genetic data. The study was conducted to investigate population genetic, and phylogeography of bigeye tuna in the North Moluccas and South Mollucas Seas, Indonesia. A total of 60 tissue bigeye tuna samples were collected from two study sites. The samples were amplified using mitochondrial DNA control region. Within population genetic diversity was revealed of 0.985 and 1.00 in North Moluccas and in south Moluccas, respectively, while between populations was 0.989. The genetic distance within population of North Moluccas (0.029) and South Mollucas (0.24) was very low, and all population was 0.027. The genetic distance between population of North Mollucas and South Mollucas was 0.025, South Mollucas and all population was 0.023, and all population with Norht Mollucas was 0.027. The genetic distance of North Mollucas and Pacific Ocean was 0.029, South Mollucas and Pacific Ocean was 0.023, North Mollucas, South Mollucas and Indian Ocean was 0.32. The Fst value between populations (0.990) showed that the two populations were not genetically different. A similar result showed from the phylogenetic trees analysis which individual of bigeye tuna was randomly clustred between North Moluccas and South Mollucas population, indicating that they were genetically close and from the same population. The population bigeye tuna from the North Mollucas and the South Mollucas exhibits no apparent phylogeographic distribution.

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Recovery of a Wild Fish Population from Whole-Lake Additions of a Synthetic Estrogen

Environmental Science & Technology ◽

10.1021/es5060513 ◽

2015 ◽

Vol 49 (5) ◽

pp. 3136-3144 ◽

Cited By ~ 26

Author(s):

Paul J. Blanchfield ◽

Karen A. Kidd ◽

Margaret F. Docker ◽

Vince P. Palace ◽

Brad J. Park ◽

...

Keyword(s):

Fish Population ◽

Wild Fish ◽

Synthetic Estrogen

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Evaluation of the introduction history and genetic diversity of a serially introduced fish population in New Zealand

Biological Invasions ◽

10.1007/s10530-012-0213-1 ◽

2012 ◽

Vol 14 (10) ◽

pp. 2057-2065 ◽

Cited By ~ 22

Author(s):

K. M. Purcell ◽

N. Ling ◽

C. A. Stockwell

Keyword(s):

Genetic Diversity ◽

New Zealand ◽

Fish Population ◽

Introduced Fish ◽

Introduction History

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Contemporary loss of genetic diversity in wild fish populations reduces biomass stability over time

10.1101/2019.12.20.884734 ◽

2019 ◽

Cited By ~ 1

Author(s):

Jérôme G. Prunier ◽

Mathieu Chevalier ◽

Allan Raffard ◽

Géraldine Loot ◽

Nicolas Poulet ◽

...

Keyword(s):

Genetic Diversity ◽

Biomass Production ◽

Biomass Productivity ◽

Wild Fish ◽

Fish Populations ◽

Ecosystem Functions ◽

Intraspecific Genetic Diversity ◽

Explained Variance ◽

Demographic Surveys ◽

Over Time

AbstractTheory predicts that biodiversity is causally linked to key ecological functions such as biomass productivity, and that loss in functional traits both among- and within-species can reduce the efficiency of ecosystem functions. There has been ample empirical and experimental demonstration that species loss indeed reduces the efficiency of ecosystem functions, with tremendous impacts on services provided by biodiversity. Nonetheless, and despite the fact that within-species diversity is strongly altered by human activities, there have been little attempts to empirically test (i) whether intraspecific genetic diversity actually promotes productivity and stability in wild populations, and, (ii) if so, to quantify its relative importance compared to other determinants. Capitalizing on 20-year demographic surveys in wild fish populations, we show that genetic diversity does not increase mean biomass production in local populations, but strongly and consistently stabilizes biomass production over time. Genetic diversity accounts for about 20% of explained variance in biomass stability across species, an important contribution about half that of environment and demography (about 40% each). Populations having suffered from demographic bottlenecks in the recent past harbored lower levels of genetic diversity and showed less stability in biomass production over the last 20 years. Our study demonstrates that the loss of intraspecific genetic diversity can destabilize biomass productivity in natural vertebrate populations in just a few generations, strengthening the importance for human societies to adopt prominent environmental policies to favor all facets of biodiversity.

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Evolutionary stasis of a heritable morphological trait in a wild fish population despite apparent directional selection

Ecology and Evolution ◽

10.1002/ece3.5274 ◽

2019 ◽

Vol 9 (12) ◽

pp. 7096-7111 ◽

Cited By ~ 4

Author(s):

Ronan James O'Sullivan ◽

Tutku Aykanat ◽

Susan E. Johnston ◽

Adam Kane ◽

Russell Poole ◽

...

Keyword(s):

Fish Population ◽

Directional Selection ◽

Wild Fish ◽

Morphological Trait ◽

Evolutionary Stasis

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Detection of Genetic Variation and Genetic Diversity in Two Indian Mudskipper Species (Boleophthalmus boddarti, B. dussumieri) using RAPD Marker

Notulae Scientia Biologicae ◽

10.15835/nsb528992 ◽

2013 ◽

Vol 5 (2) ◽

pp. 139-143

Author(s):

Vellaichamy RAMANADEVI ◽

Muthusamy THANGARAJ ◽

Anbazhagan SURESHKUMAR ◽

Jayachandran SUBBURAJ

Keyword(s):

Genetic Diversity ◽

Population Structure ◽

Environmental Changes ◽

Genetic Relationships ◽

Rapd Marker ◽

Distinct Species ◽

Fish Population ◽

Habitat Destruction ◽

Arbitrary Primers ◽

Vellar Estuary

Due to the environmental changes and habitat destruction the mudskipper fish population is decreasing in recent years. To predict the fish population structure, frequent manual survey and molecular methods are widely used. Molecular markers such as RAPD, microsatellite, allozyme, D-loop haplotype are frequently adopted to assess the population structure of an organism. In this study ten- arbitrary primers were screened to estimate the genetic relationships and diversity of two mudskipper species (Boleophthalmus boddarti and B. dussumieri) in Vellar estuary, Tamilnadu, India. By this RAPD marker study, the genetic diversity (H) in B. boddarti was more (0.0116 ± 0.0066) than in B. dussumieri (0.0056 ± 0.0024) in Vellar estuary (India). The genetic distance between B. boddarti and B. dussumieri was 1.7943. By observing the species specific bands and the phylogenetic analysis it is revealed that these two species clearly deviated into separate clusters emphasizing the distinct species status.

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Feeding and schooling behaviour of barracouta (Thyrsites atun) off Otago, New Zealand

Marine and Freshwater Research ◽

10.1071/mf97074 ◽

1998 ◽

Vol 49 (1) ◽

pp. 19 ◽

Cited By ~ 4

Author(s):

Richard L. O'Driscoll

Keyword(s):

New Zealand ◽

Feeding Strategy ◽

Stomach Contents ◽

Fish Population ◽

Pelagic Fish ◽

Wild Fish ◽

Gut Contents ◽

Side Scan Sonar ◽

Schooling Behaviour ◽

The Mean

To test the hypothesis that fish in schools forage more successfully than individual fish, an analysis was made of the stomach contents of barracouta (Thyrsites atun), a facultatively schooling species of fish, in a wild fish population. Schooling (n = 29) and non-schooling (n = 86) barracouta were captured during a side-scan sonar survey of pelagic fish off the coast of Otago, New Zealand. The proportion of fish with empty stomachs was lower and the mean wet mass of gut contents was higher in barracouta from schools. The increased feeding success of fish in schools was due to increased consumption of krill, Nyctiphanes australis. In regions where the density of krill in net tows was high (>1000 individuals km-1 tow length) or moderate (100–1000 individuals km-1), the mean wet mass of krill in the stomachs of schooling barracouta was 2–4 times higher than in the stomachs of non-schooling barracouta. Few schools of barracouta were observed in areas with low densities of krill (<100 individuals km-1). Schooling by barracouta seems to be a feeding strategy to exploit surface swarms of krill.

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Heritability estimation via molecular pedigree reconstruction in a wild fish population reveals substantial evolutionary potential for sea age at maturity, but not size within age classes

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2018-0123 ◽

2019 ◽

Vol 76 (5) ◽

pp. 790-805 ◽

Cited By ~ 3

Author(s):

Thomas E. Reed ◽

Paulo Prodöhl ◽

Caroline Bradley ◽

John Gilbey ◽

Philip McGinnity ◽

...

Keyword(s):

Body Size ◽

Fish Population ◽

Wild Fish ◽

Phenotypic Traits ◽

Evolutionary Potential ◽

Heritable Variation ◽

Heritability Estimation ◽

Scottish Population ◽

Rapid Changes ◽

Genetic Contributions

While evolutionary responses require heritable variation, estimates of heritability (h2) from wild fish populations remain rare. A 20-year molecular pedigree for a wild Scottish population of Atlantic salmon (Salmo salar) was used to investigate genetic contributions to (co)variation in two important, correlated, phenotypic traits: “sea age” (number of winters spent at sea prior to spawning) and size-at-maturity (body length just prior to spawning). Sea age was strongly heritable (h2 = 0.51) and size exhibited moderate heritability (h2 = 0.27). A very strong genetic correlation (rG = 0.96) between these traits implied the same functional loci must underpin variation in each. Indeed, body size within sea ages had much lower heritability that did not differ significantly from zero. Thus, within wild S. salar populations, temporal changes in sea age composition could reflect evolutionary responses, whereas rapid changes of body size within sea ages are more likely due to phenotypic plasticity. These inheritance patterns will influence the scope of evolutionary responses to factors such as harvest or climate change and, hence, have management implications for salmonid populations comprising a mix of sea ages.

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