scholarly journals An investigation of genetic connectivity shines a light on the relative roles of isolation by distance and oceanic currents in three diadromous fish species

2021 ◽  
Author(s):  
J. E. O'Dwyer ◽  
N. Murphy ◽  
Z. Tonkin ◽  
J. Lyon ◽  
W. Koster ◽  
...  
Keyword(s):  
Fish Species ◽  
Isolation By Distance ◽  
Genetic Connectivity ◽  
Diadromous Fish ◽  
Oceanic Currents

Potential re-establishment of diadromous fish species in the River Scheldt (Belgium)

Hydrobiologia ◽  
2008 ◽  
Vol 602 (1) ◽  
pp. 155-159 ◽  
Author(s):  
D. Buysse ◽  
J. Coeck ◽  
J. Maes
Keyword(s):  
Fish Species ◽  
Diadromous Fish

scholarly journals Population genetic structure of New Zealand blue cod (Parapercis colias) based on mitochondrial and microsatellite DNA markers

2021 ◽  
Author(s):  
◽  
Clare Louise Gebbie
Keyword(s):  
New Zealand ◽  
Genetic Structure ◽  
Population Genetic Structure ◽  
Dna Markers ◽  
Microsatellite Dna ◽  
Population Genetic ◽  
Current Knowledge ◽  
Isolation By Distance ◽  
Genetic Connectivity ◽  
Microsatellite Dna Markers

<p>Parapercis colias (blue cod) is an endemic temperate reef fish that supports an important commercial and recreational fishery in New Zealand. However, concerns have been raised about localized stock depletion, and multiple lines of evidence have suggested P. colias may form several biologically distinct populations within the New Zealand Exclusive Economic Zone. Mark and recapture studies along with otolith and stable isotope studies have indicated that individuals are sedentary with very limited movement beyond the scale of 10-20km. The primary goal of this research was to advance the current knowledge of P. colias population genetic structure. This information can be incorporated into stock assessment models with the aim of improving the management of the P. colias fishery. This study made use of 454 pyrosequencing technology to isolate and develop the first set of microsatellite DNA markers for P. colias. These seven microsatellite loci, along with mitochondrial control region sequences, were used to determine the levels of genetic variation and differentiation between sites around the New Zealand coastline, including the Chatham Islands.  Significant differentiation was observed between the Chatham Islands and mainland New Zealand sample sites, indicating that these two regions form distinct populations. Interpretation of the results for the mainland sites was more complex. Mitochondrial sequence data detected no significant pairwise differentiation between mainland sites, although a pattern of isolation-by-distance was observed. However, evidence for genetic differentiation among mainland sites was weak based on the microsatellite DNA analysis. Although pairwise Gѕт levels were significant in some sites, this was not reflected in principal component analysis or Bayesian structure analysis. It is likely that through long range dispersal, migration is at or above the threshold for genetic connectivity, but below a level necessary for demographic connectivity. This is indicated by both the genetic structure reported here, along with previous studies showing limited dispersal of P. colias.</p>

iPODfish – A new method to infer the historical occurrence of diadromous fish species along river networks

2021 ◽  
pp. 152437
Author(s):  
Gonçalo Duarte ◽  
Paulo Branco ◽  
Gertrud Haidvogl ◽  
Maria Teresa Ferreira ◽  
Didier Pont ◽  
...  
Keyword(s):  
Fish Species ◽  
New Method ◽  
River Networks ◽  
Diadromous Fish

scholarly journals Temporally dynamic habitat suitability predicts genetic relatedness among caribou

2014 ◽  
Vol 281 (1792) ◽  
pp. 20140502 ◽  
Author(s):  
Glenn Yannic ◽  
Loïc Pellissier ◽  
Maël Le Corre ◽  
Christian Dussault ◽  
Louis Bernatchez ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Habitat Use ◽  
Genetic Relatedness ◽  
Landscape Heterogeneity ◽  
Isolation By Distance ◽  
Temporal Variations ◽  
Genetic Connectivity ◽  
Landscape Permeability ◽  
Conservation Implications ◽  
Distance Model

Landscape heterogeneity plays a central role in shaping ecological and evolutionary processes. While species utilization of the landscape is usually viewed as constant within a year, the spatial distribution of individuals is likely to vary in time in relation to particular seasonal needs. Understanding temporal variation in landscape use and genetic connectivity has direct conservation implications. Here, we modelled the daily use of the landscape by caribou in Quebec and Labrador, Canada and tested its ability to explain the genetic relatedness among individuals. We assessed habitat selection using locations of collared individuals in migratory herds and static occurrences from sedentary groups. Connectivity models based on habitat use outperformed a baseline isolation-by-distance model in explaining genetic relatedness, suggesting that variations in landscape features such as snow, vegetation productivity and land use modulate connectivity among populations. Connectivity surfaces derived from habitat use were the best predictors of genetic relatedness. The relationship between connectivity surface and genetic relatedness varied in time and peaked during the rutting period. Landscape permeability in the period of mate searching is especially important to allow gene flow among populations. Our study highlights the importance of considering temporal variations in habitat selection for optimizing connectivity across heterogeneous landscape and counter habitat fragmentation.

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