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Aquaculture Environment Interactions

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AEI 11:205-211 (2019)  -  DOI: https://doi.org/10.3354/aei00308

Modeling the reproductive impact of aquaculture-produced sexually fertile triploids on conspecific diploid populations

Federico M. Winkler1,2,3,*, Miguel Concha4, Christopher Concha1

1Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1780000, Chile
2Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Larrondo 1281, Coquimbo 1780000, Chile
3Centro de Innovación Acuícola AquaPacífico, Universidad Católica del Norte, Larrondo 1281, Coquimbo 1780000, Chile
4Departamento de Física, Liceo Bicentenario Alejandro Álvarez Jofre, Victoria 150, Ovalle 1840000, Chile
*Corresponding author:

ABSTRACT: The use of artificially produced triploid (3n) organisms has been proposed as a strategy to produce total or partial sterility in a number of species in order to prevent the potential negative effects of escapees on the genetic structure and integrity of wild conspecific populations or to avoid having alien species become feral in a new environment. When infertility is incomplete, triploid organisms are able to produce gametes that compete with those produced by wild diploid populations or crops that share the same habitat during reproductive periods, which may adversely affect the reproductive success of the wild population. In the present study, a model was developed in order to estimate the effects of the production of gametes by triploid organisms on the reproductive efficiency of a sympatric diploid population of the same species. The chance of the production of balanced gametes by triploids rapidly reduced with the increase of haploid number of the species. It was concluded that, in most aquatic species, this effect depends on the relative contribution of gametes derived from triploid individuals ( pet), which is determined by the proportion of triploids in the population and their relative fecundity relative to normal diploids. The variation of the reproductive efficiency in a mixed population of diploids and triploids will be directly proportional to pet if only one sex is fertile in triploids but will have a logarithmic relationship if both sexes are fertile.


KEY WORDS: Triploids · Risk assessment · Reproductive success · Sterility · Chromosome manipulation · Fecundity


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Cite this article as: Winkler FM, Concha M, Concha C (2019) Modeling the reproductive impact of aquaculture-produced sexually fertile triploids on conspecific diploid populations. Aquacult Environ Interact 11:205-211. https://doi.org/10.3354/aei00308

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