Temporal changes and effective population size of an Italian isolated and supportive-breeding managed northern pike (Esox lucius) population

Lucentini, Livia; Palomba, Antonella; Gigliarelli, L.; Sgaravizzi, G.; Lancioni, Hovirag; Lanfaloni, Luisa; Natali, Mauro; Panara, Fausto

doi:10.1016/j.fishres.2008.10.007

Cited by 12 publications

(19 citation statements)

References 53 publications

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“…; Lucentini et al. ). The primary determinants believed to have shaped modern‐day population structures are geographical isolation in southerly refugia during the Pleistocene ice ages and subsequent colonisation histories in rivers and lakes formed postglacially about 10–13,000 years ago.…”

Section: Introductionmentioning

confidence: 97%

From regionally predictable to locally complex population structure in a freshwater top predator: river systems are not always the unit of connectivity in Northern Pike Esox lucius

Bekkevold

Jacobsen

Hemmer‐Hansen

et al. 2014

Ecology of Freshwater Fish

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Contemporary genetic diversity is the product of both historical and contemporary forces, such as climatic and geological processes affecting range distribution and continuously moulded by evolutionary forces selection, gene flow and genetic drift. Predatory freshwater fishes, such as Northern Pike Esox lucius, commonly exhibit small population sizes, and several local populations are considered endangered. Pike inhabit diverse habitat types, including lakes, rivers and brackish marine waters, thus spanning from small isolated patches to large open marine systems. However, pike population structure from local to regional scales is relatively poorly described, in spite of its significance to developing conservation measures. We analysed microsatellite variation in a total of 1185 North European pike from 46 samples collected across both local and regional scales, as well as over time, to address two overarching questions: Is pike population structure associated with local and/or regional connectivity patterns, and which factors likely have the main influence on the contemporary distribution of genetic diversity? To answer this, we combined estimators of population diversity and structure to assess evidence of whether populations within (i) habitats, (ii) drainage systems and (iii) geographical regions are closer related than among these ranges, and whether patterns are temporally stable. Contrasting previous predictions that genetic drift obscures signals of postglacial colonisation history, we identified clear regional differences in population genetic signatures, suggesting a major effect of drainage divides on colonisation history and connectivity. However, several populations deviated from the general pattern, showing that local processes may be complex and need to be examined case‐by‐case.

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Section: Introductionmentioning

confidence: 97%

From regionally predictable to locally complex population structure in a freshwater top predator: river systems are not always the unit of connectivity in Northern Pike Esox lucius

Bekkevold

Jacobsen

Hemmer‐Hansen

et al. 2014

Ecology of Freshwater Fish

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“…Genetic variation of populations or species is the result of their evolutionary history and its decrease can reduce their adaptability and surviving potential in a changing environment (Lucentini et al, 2009), also genetic diversity is an important factor in the conservation of endangered species (Na-Nakorn et al, 2006). From an applied perspective, genetic information on populations allows selection of genetic markers to assist artificial selection programmes or to design genetic management strategies for wild species (Diz and Presa, 2009).…”

Section: Introductionmentioning

confidence: 99%

Microsatellites reveal weak genetic differentiation between Rutilus frisii kutum (Kamenskii, 1901) populations south of the Caspian Sea

et al. 2011

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Rutilus frisii kutum (Kamenskii, 1901) is one of the most important bony fish inhabiting the Caspian Sea. The Iranian Fisheries Organization produced up to 200 million fry to restock the Caspian Sea population annually. Loss of genetic stocks and gradual depletion of the gene pool are parameters of great concern for the future of the species. In the present study, we used ten microsatellite markers to estimate the level of genetic diversity and compare the degree of genetic differentiation among kutum populations collected from Gharesou, Tajan and Goharbaran rivers in the south of Caspian Sea. The average number of alleles per locus ranged from 4 to 12.33, while the average observed and expected heterozygosity ranged from 0.22 to 1.00 and from 0.69 to 0.88, respectively. Through AMOVA, a low level of variation between regions as well as a large percentage of total variation within population was observed. Current knowledge about artificial breeding suggests that offspring transfer between rivers has probably reduced the natural divergence naturally exists between these pools. These results could be useful for the genetic management of kutum populations.

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“…We used several methods in our study to avoid the possibility of a biased estimation and, in all cases, our estimates of Ne are significantly below the minimum value of 500 suggested for long term population sustainability by Waples (1990) for pacific salmon and by Franklin (1980) for other species. Such low Ne values have been reported for other species too, such as European grayling (Ne: 16.5-71.4, Swatdipong et al 2010), salmonids from Fraser River in Canada (Ne: 81-691, Shrimpton and Heath 2003), brown trout from Swedish lakes (Ne: 52-480, Jorde and Ryman 1996) or for Italian northern pike (Ne: 17-122, Lucentini et al 2009). The consequence of Ne values much lower than 500 can be profound and such values can render the population vulnerable to extinction (Waples 1990).…”

Section: Discussionmentioning

confidence: 76%

“…Though not driven to fixation yet, it seems that the low effective common carp population size could lead to genetic swamping in a short period; although only 3 generations have passed since the last introduction occurred in L. Volvi, the genetic make-up of the lake has changed considerably during the last 12 years. This is not the first study showing that remarkable temporal changes are likely to happen in the genetic structure of freshwater species with low Ne; such is the case for a small and isolated Italian northern pike population (Lucentini et al 2009), stocked brown trout populations affected by unstable environmental conditions (Østergaard et al 2003) and even large and presumed vigorous populations of steelhead trout samples (Heath et al 2002). Thus, present and previously reported data show that calculation of parameters such as effective population size is crucial for better understanding of population dynamics.…”

Section: Effects Of Stocking Practicesmentioning

confidence: 73%

Genetic monitoring and effects of stocking practices on small Cyprinus carpio populations

Lappa

Kalomoiris

Oikonomidis³

et al. 2011

Conserv Genet

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The ability to detect genetic differences both in space and time is crucial for conserving genetic variation. It can reveal genetic diversity and genetic composition changes of declining native populations that are supported through stocking with captive bred individuals. The present study was designed to analyse the temporal stability of a declining common carp (Cyprinus carpio) population from Lake Volvi (North Greece). Polymorphism was evaluated using seven microsatellite loci at two sampling time points (separated by 12 years). The genetic variability of four additional populations (from two rivers and two lakes) in Northern Greece was also investigated for comparison. Heterozygosity values (0.692-0.868) and allelic richness (8.530-11.148) were high for all studied populations and comparable to other European populations. However, the analysis of temporal common carp samples from Lake Volvi revealed a significant change in their genetic composition and admixture analysis demonstrated significant introgression of stocked individuals into the native population. Both temporal and point estimate methods revealed low effective size (Ne = 61-171.3) for this population, possibly a result of an ancient genetic bottleneck that led to population decline and/or recent anthropogenic interventions. This low Ne has rendered the native population vulnerable to alteration of its genetic composition. Our study demonstrates that enhancement programs should be applied cautiously, especially for small populations. Moreover, it underlines the need for temporal analyses, which may contribute to the evaluation of previous management policies and to future decision making.

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Temporal changes and effective population size of an Italian isolated and supportive-breeding managed northern pike (Esox lucius) population

Cited by 12 publications

References 53 publications

From regionally predictable to locally complex population structure in a freshwater top predator: river systems are not always the unit of connectivity in Northern Pike Esox lucius

From regionally predictable to locally complex population structure in a freshwater top predator: river systems are not always the unit of connectivity in Northern Pike Esox lucius

Microsatellites reveal weak genetic differentiation between Rutilus frisii kutum (Kamenskii, 1901) populations south of the Caspian Sea

Genetic monitoring and effects of stocking practices on small Cyprinus carpio populations

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