Transferrin polymorphism in Amazon turtle (Podocnemis expansa) stocks

Teixeira, Aylton Saturnino; Jamieson, Alan; Raposo, José Carlos Paula; Vieira, Alvaro Alves

doi:10.1590/S0100-84551996000400004

Abstract

The transferrin gene locus (Tf) was investigated in five populations of the Amazon turtle (Podocnemis expansa) sampled from five geographical areas in the Amazon region. This locus was polymorphic, showing three genotypes (Tfª Tfª, Tfª Tf b and Tf b Tf b), presumably encoded by two co-dominant alleles, Tfª and Tf b. All populations showed good genetic balance according to Hardy-Weinberg expectations, and may sustain the hypothesis of a single stock in the area investigated. The data are consistent with free flow of genes among the population samples examined.

polymorphism; Amazon turtle

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Transferrin polymorphism in Amazon turtle (Podocnemis expansa) stocks

Aylton Saturnino Teixeira^I; Alan Jamieson^II; José Carlos Paula Raposo^I; Alvaro Alves Vieira^I

^IInstituto Nacional de Pesquisas da Amazônia (INPA), Caixa Postal 478, 69083-000 Manaus, AM, Brasil. Send correspondence to A.S.T.

^IISchool of Biological Sciences, University of Birmingham, Birmingham, UK

ABSTRACT

The transferrin gene locus (Tf) was investigated in five populations of the Amazon turtle (Podocnemis expansa) sampled from five geographical areas in the Amazon region. This locus was polymorphic, showing three genotypes (Tf^a Tf^a, Tf^a Tf^b and Tf^b Tf^b), presumably encoded by two co-dominant alleles, Tf^a and Tf^b. All populations showed good genetic balance according to Hardy-Weinberg expectations, and may sustain the hypothesis of a single stock in the area investigated. The data are consistent with free flow of genes among the population samples examined.

Keywords: polymorphism; Amazon turtle.

Alho, C.J.R. and Pádua, L.F.M. (1982a). Reproductive parameters and nesting behavior of the Amazon turtle Podocnemis expansa (Testudinata: Pelomedusidae) in Brazil. Can. J. Zool. 60: 97-103.
Alho, C.J.R. and Pádua, L.F.M. (1982b). Sincronia entre o regime de vazante do rio e o comportamento de nidificação da tartaruga da Amazônia Podocnemis expansa (Testudinata: Pelomedusidae). Acta Amazônica 12: 139-143.
Alho, C.J.R., Danni, T.M.S. and Pádua, L.F.M. (1984). Influência da temperatura de incubação na determinação do sexo da tartaruga da Amazônia Podocnemis expansa (Testudinata: Pelomedusidae). Rev. Bras. Biol. 44: 305-311.
Alho, C.J.R., Danni, T.M.S. and Pádua, L.F.M. (1985). Temperature-dependent sex determination in Podocnemis expansa (Testudinata: Pelumedusidae). Biotropica 17: 75-78.
Danni, T.M.S. and Alho, C.J.R. (1985). Estudo histológico da diferenciação sexual em tartarugas recém-eclodidas (Podocnemis expansa, Pelomedusidae). Rev. Bras. Biol. 45: 365-368.
Frair, W., Mittermeier, R.A. and Rhodin, A.G.J. (1978). Blood biochemistry and relations among Podocnemis turtles (Pleorodira, Pelomedusidae). Comp. Biochem. Physiol. 61B: 139-143.
Jamieson, A. and Birley, A.J. (1989). The distribution of transferrin alleles in haddock stocks. J. Cons. Int. Explor. Mer 45: 248-262.
Jamieson, A. and Smith, P.J. (1987). Atlantic mackerel (Scomber scombrus L.) stocks and genes: A review. J. Cons. Int. Explor. Mer 44: 66-72.
Jamieson, A. and Turner, R.J. (1978). The extended series of Tf alleles in Atlantic cod, Gadus morhua. In: Marine Organisms (Battaglia, B. and Beardmore, J., eds.). NATO Conference Series IV: Marine Sciences. No. 2. Plenum Press, New York, pp. 699-729.
Smith, P.J. and Robertson, D.A. (1981). Genetic evidence for two species of Sprat (Sprattus) in New Zealand waters. Mar. Biol. 62: 227-233.
Teixeira, A.S. and Jamieson, A. (1985). Genetic variation in plasma transferrins of tabaqui, Colossoma macropomum (CUVIER. 1818). Amazoniana 9: 159-168.
Teixeira, A.S., Raposo, J.C.P. and Jamieson, A. (1990). Transferrin variation in jaraquis, Semaprochilodus taeniurus and S. insignis, in the Amazon region. Anim. Genet. 21: 419-422.

Publication Dates

Publication in this collection
26 Oct 2006
Date of issue
1996

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

[1] Alho, C.J.R. and Pádua, L.F.M. (1982a). Reproductive parameters and nesting behavior of the Amazon turtle Podocnemis expansa (Testudinata: Pelomedusidae) in Brazil. Can. J. Zool. 60: 97-103.

[2] Alho, C.J.R. and Pádua, L.F.M. (1982b). Sincronia entre o regime de vazante do rio e o comportamento de nidificação da tartaruga da Amazônia Podocnemis expansa (Testudinata: Pelomedusidae). Acta Amazônica 12: 139-143.

[3] Alho, C.J.R., Danni, T.M.S. and Pádua, L.F.M. (1984). Influência da temperatura de incubação na determinação do sexo da tartaruga da Amazônia Podocnemis expansa (Testudinata: Pelomedusidae). Rev. Bras. Biol. 44: 305-311.

[4] Alho, C.J.R., Danni, T.M.S. and Pádua, L.F.M. (1985). Temperature-dependent sex determination in Podocnemis expansa (Testudinata: Pelumedusidae). Biotropica 17: 75-78.

[5] Danni, T.M.S. and Alho, C.J.R. (1985). Estudo histológico da diferenciação sexual em tartarugas recém-eclodidas (Podocnemis expansa, Pelomedusidae). Rev. Bras. Biol. 45: 365-368.

[6] Frair, W., Mittermeier, R.A. and Rhodin, A.G.J. (1978). Blood biochemistry and relations among Podocnemis turtles (Pleorodira, Pelomedusidae). Comp. Biochem. Physiol. 61B: 139-143.

[7] Jamieson, A. and Birley, A.J. (1989). The distribution of transferrin alleles in haddock stocks. J. Cons. Int. Explor. Mer 45: 248-262.

[8] Jamieson, A. and Smith, P.J. (1987). Atlantic mackerel (Scomber scombrus L.) stocks and genes: A review. J. Cons. Int. Explor. Mer 44: 66-72.

[9] Jamieson, A. and Turner, R.J. (1978). The extended series of Tf alleles in Atlantic cod, Gadus morhua. In: Marine Organisms (Battaglia, B. and Beardmore, J., eds.). NATO Conference Series IV: Marine Sciences. No. 2. Plenum Press, New York, pp. 699-729.

[10] Smith, P.J. and Robertson, D.A. (1981). Genetic evidence for two species of Sprat (Sprattus) in New Zealand waters. Mar. Biol. 62: 227-233.

[11] Teixeira, A.S. and Jamieson, A. (1985). Genetic variation in plasma transferrins of tabaqui, Colossoma macropomum (CUVIER. 1818). Amazoniana 9: 159-168.

[12] Teixeira, A.S., Raposo, J.C.P. and Jamieson, A. (1990). Transferrin variation in jaraquis, Semaprochilodus taeniurus and S. insignis, in the Amazon region. Anim. Genet. 21: 419-422.