Genetic analyses allowed management and conservative programmes specifically designed for biodiversity conservation purposes. To date, no information is available for the
N
e definition of any ...Italian northern pike population, because of their wide, highly fragmented, distribution. Low gene flow levels may have caused some of the health population problems emerging from professional fisheries data, underlining a marked reduction of these populations. This paper reports the first estimate of genetic
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e of the Lake Trasimeno's northern pike, by means of microsatellites data, over the last four decades compared with five other significant Italian populations.
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e values were evaluated through specific software and
θ estimator. The
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e results confirm that, despite a marked reduction between 1966 and 1997 and a less than optimal status, the Trasimeno population shows a positive trend in its health status, presumably due to proper management programmes. Considerations on the biological conservation and management of this pike population are also reported.
The two freshwater sponges Ephydatia fluviatilis and Ephydatia mülleri belong to the widespread Spongillidae family. Their morphological tracts are very similar and can be distinguished mainly on the ...basis of their gemmuloscleres. However, when gemmules are absent it is essential to have an unambiguous species attribution for a population genetic study based on fresh tissues and historical collections. This article reports a simple Polymerase Chain Reaction-Restriction Fragment Length Polymorphism (PCR-RFLP) analysis, applied to DNA extracted from both gemmules and fresh tissues in order to discriminate between the two congeneric E. fluviatilis and E. mülleri. Such a biomolecular method is based on the discriminative enzymes' digestion of each of the three amplified fragments 5.8S-ITS2-28S, D3 domain of the 28S subunit and COI. Two restriction enzymes were tested for a 620-642 bp fragment of 5.8S-ITS2-28S and for a 342 bp fragment of the D3 domain of the 28S, one restriction enzyme was tested for a 681 bp fragment codifying for COI. Obtained digestion patterns were diagnostic for each of the two species, providing a relatively simple, fast and cheap method for species attribution compared to sequencing.
The two freshwater sponges Ephydatia fluviatilis and Ephydatia muelleri belong to the widespread Spongillidae family. Their morphological tracts are very similar and can be distinguished mainly on ...the basis of their gemmuloscleres. However, when gemmules are absent it is essential to have an unambiguous species attribution for a population genetic study based on fresh tissues and historical collections. This article reports a simple Polymerase Chain Reaction-Restriction Fragment Length Polymorphism (PCR-RFLP) analysis, applied to DNA extracted from both gemmules and fresh tissues in order to discriminate between the two congeneric E. fluviatilis and E. muelleri. Such a biomolecular method is based on the discriminative enzymes' digestion of each of the three amplified fragments 5.8S-ITS2-28S, D3 domain of the 28S subunit and COI. Two restriction enzymes were tested for a 620-642 bp fragment of 5.8S-ITS2-28S and for a 342 bp fragment of the D3 domain of the 28S, one restriction enzyme was tested for a 681 bp fragment codifying for COI. Obtained digestion patterns were diagnostic for each of the two species, providing a relatively simple, fast and cheap method for species attribution compared to sequencing.
