Limits...
Captive breeding programs based on family groups in polyploid sturgeons.

Boscari E, Pujolar JM, Dupanloup I, Corradin R, Congiu L - PLoS ONE (2014)

Bottom Line: This information was used to plan a breeding scheme considering familiar groups as breeding units and identifying mating priorities.A two-step strategy is proposed: a short-term breeding program, relying on the 13 remaining F0 individuals of certain wild origin; and a long-term plan based on F1 families.The strategy proposed is transferable to the several other tetraploid sturgeon species on the brink of extinction.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, University of Padova, Padova, Italy.

ABSTRACT
In species with long life cycles and discontinuous availability of individuals to reproduction, implementing a long-term captive breeding program can be difficult or impossible. In such cases, managing diversity among familiar groups instead of individuals could become a suitable approach to avoid inbreeding and increase the possibility to accomplish a breeding scheme. This is the case of several sturgeon species including the Adriatic sturgeon, whose recovery depends on the management of a few captive stocks directly descended from the same group of wild parents. In the present study, relatedness among 445 potential breeders was inferred with a novel software for pedigree reconstruction in tetraploids ("BreedingSturgeons"). This information was used to plan a breeding scheme considering familiar groups as breeding units and identifying mating priorities. A two-step strategy is proposed: a short-term breeding program, relying on the 13 remaining F0 individuals of certain wild origin; and a long-term plan based on F1 families. Simulations to evaluate the loss of alleles in the F2 generation under different pairing strategies and assess the number of individuals to breed, costs and logistical aquaculture constraints were performed. The strategy proposed is transferable to the several other tetraploid sturgeon species on the brink of extinction.

Show MeSH
F1 breeding plan.Pairwise distances among the families of the “Breeders Unit” estimated by comparing the cumulative profiles of the parent pairs. The black frame includes distances estimated at 24 loci and excludes the ones based on 7 loci only. Light grey and dark grey cells represent crosses to be avoided based on threshold values of 0,35 (at 24 loci) and 0,45 (at 7 loci), respectively. Black cells represent selected crosses identified by the software “BreedingPlanSturgeons” (within the black frame) or by visual inspection (for the families marked with V.I.). N = number of individuals per family.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4214717&req=5

pone-0110951-g002: F1 breeding plan.Pairwise distances among the families of the “Breeders Unit” estimated by comparing the cumulative profiles of the parent pairs. The black frame includes distances estimated at 24 loci and excludes the ones based on 7 loci only. Light grey and dark grey cells represent crosses to be avoided based on threshold values of 0,35 (at 24 loci) and 0,45 (at 7 loci), respectively. Black cells represent selected crosses identified by the software “BreedingPlanSturgeons” (within the black frame) or by visual inspection (for the families marked with V.I.). N = number of individuals per family.

Mentions: The long-term plan was designed based on the F1 progeny, using a family-based approach. A total of 32 crosses was planned, one for each of the 32 families that composed the “breeders unit”: 30 reared at V.I.P. (27 allocated and 3 not-allocated) plus two families from the Ticino River Park (1 allocated and 1 not-allocated). Pairwise genetic distances among families are shown in Fig. 2, together with details on recommended crosses and those crosses to be avoided (distance values <0.35 for 24 loci and <0.45 for 7 loci).


Captive breeding programs based on family groups in polyploid sturgeons.

Boscari E, Pujolar JM, Dupanloup I, Corradin R, Congiu L - PLoS ONE (2014)

F1 breeding plan.Pairwise distances among the families of the “Breeders Unit” estimated by comparing the cumulative profiles of the parent pairs. The black frame includes distances estimated at 24 loci and excludes the ones based on 7 loci only. Light grey and dark grey cells represent crosses to be avoided based on threshold values of 0,35 (at 24 loci) and 0,45 (at 7 loci), respectively. Black cells represent selected crosses identified by the software “BreedingPlanSturgeons” (within the black frame) or by visual inspection (for the families marked with V.I.). N = number of individuals per family.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4214717&req=5

pone-0110951-g002: F1 breeding plan.Pairwise distances among the families of the “Breeders Unit” estimated by comparing the cumulative profiles of the parent pairs. The black frame includes distances estimated at 24 loci and excludes the ones based on 7 loci only. Light grey and dark grey cells represent crosses to be avoided based on threshold values of 0,35 (at 24 loci) and 0,45 (at 7 loci), respectively. Black cells represent selected crosses identified by the software “BreedingPlanSturgeons” (within the black frame) or by visual inspection (for the families marked with V.I.). N = number of individuals per family.
Mentions: The long-term plan was designed based on the F1 progeny, using a family-based approach. A total of 32 crosses was planned, one for each of the 32 families that composed the “breeders unit”: 30 reared at V.I.P. (27 allocated and 3 not-allocated) plus two families from the Ticino River Park (1 allocated and 1 not-allocated). Pairwise genetic distances among families are shown in Fig. 2, together with details on recommended crosses and those crosses to be avoided (distance values <0.35 for 24 loci and <0.45 for 7 loci).

Bottom Line: This information was used to plan a breeding scheme considering familiar groups as breeding units and identifying mating priorities.A two-step strategy is proposed: a short-term breeding program, relying on the 13 remaining F0 individuals of certain wild origin; and a long-term plan based on F1 families.The strategy proposed is transferable to the several other tetraploid sturgeon species on the brink of extinction.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, University of Padova, Padova, Italy.

ABSTRACT
In species with long life cycles and discontinuous availability of individuals to reproduction, implementing a long-term captive breeding program can be difficult or impossible. In such cases, managing diversity among familiar groups instead of individuals could become a suitable approach to avoid inbreeding and increase the possibility to accomplish a breeding scheme. This is the case of several sturgeon species including the Adriatic sturgeon, whose recovery depends on the management of a few captive stocks directly descended from the same group of wild parents. In the present study, relatedness among 445 potential breeders was inferred with a novel software for pedigree reconstruction in tetraploids ("BreedingSturgeons"). This information was used to plan a breeding scheme considering familiar groups as breeding units and identifying mating priorities. A two-step strategy is proposed: a short-term breeding program, relying on the 13 remaining F0 individuals of certain wild origin; and a long-term plan based on F1 families. Simulations to evaluate the loss of alleles in the F2 generation under different pairing strategies and assess the number of individuals to breed, costs and logistical aquaculture constraints were performed. The strategy proposed is transferable to the several other tetraploid sturgeon species on the brink of extinction.

Show MeSH