Concordance between dispersal and mitochondrial gene flow: isolation by distance in a tropical teleost, Lates calcarifer (Australian barramundi)

Abstract

Patterns of population subdivision and the relationship between gene flow and geographical distance in the tropical estuarine fish Lates calcarifer (Centropomidae) were investigated using mtDNA control region sequences. Sixty-three putative haplotypes were resolved from a total of 270 individuals from nine localities within three geographical regions spanning the north Australian coastline. Despite a continuous estuarine distribution throughout the sampled range, no haplotypes were shared among regions. However, within regions, common haplotypes were often shared among localities. Both sequence-based (average ST = 0.328) and haplotype-based (average ST = 0.182) population subdivision analyses indicated strong geographical structuring. Depending on the method of calculation, geographical distance explained either 79 per cent (sequence-based) or 23 per cent (haplotype-based) of the variation in mitochondrial gene flow. Such relationships suggest that genetic differentiation of L. calcarifer has been generated via isolation-by-distance, possibly in a stepping-stone fashion. This pattern of genetic structure is concordant with expectations based on the life history of L. calcarifer and direct studies of its dispersal patterns. Mitochondrial DNA variation, although generally in agreement with patterns of allozyme variation, detected population subdivision at smaller spatial scales. Our analysis of mtDNA variation in L. calcarifer confirms that population genetic models can detect population structure of not only evolutionary significance but also of demographic significance. Further, it demonstrates the power of inferring such structure from hypervariable markers, which correspond to small effective population sizes.

Levels and patterns of genetic diversity in wild Chrysichthys nigrodigitatus in the Lagos Lagoon complex

“…The results show that some individuals from PRE may have introgressed mtDNA from WAK or were wrongly identified as C. nigrodigitatus. However, among Japanese freshwater bagrids, Watanabe and Nishida (2003) found a divergence of 0.7 to 8.0% and 0.4% to 13.2% sequence divergence among haplotypes of Lates calcarifer (Chenoweth et al, 1998) for the same mtDNA region, values comparable to our result. Therefore, combination of both mtDNA and nuclear DNA markers must be employed to resolve this problem.…”

Levels and patterns of genetic diversity in wild Chrysichthys nigrodigitatus in the Lagos Lagoon complex

“…The results show that some individuals from PRE may have introgressed mtDNA from WAK or were wrongly identified as C. nigrodigitatus. However, among Japanese freshwater bagrids, Watanabe and Nishida (2003) found a divergence of 0.7 to 8.0% and 0.4% to 13.2% sequence divergence among haplotypes of Lates calcarifer (Chenoweth et al, 1998) for the same mtDNA region, values comparable to our result. Therefore, combination of both mtDNA and nuclear DNA markers must be employed to resolve this problem.…”

Variasi DNA Mitokhondria dari Ikan kakap Putih Budidaya dan Dari Tangkapan Liar Di Thailand

“…Population differentiation between two wild populations was highly significant, indicating strong population structure in Thailand. This pattern of population structure is concordant with life history and dispersal pattern of L. calcarifer that tend to migrates in closed river system (Salini & Shaklee, 1988;Chenoweth et. al., 1998;Doupe et al, 1999).…”

Influence of life‐history variation on the genetic structure of two sympatric salamander taxa

“…Associations between dispersal ability and populationlevel genetic structure or phylogeographical patterns have been established for a variety of species (Chenoweth et al 1998;Bohonak 1999;Dawson et al 2002;Kelly & Eernisse 2007). The patterns observed in this study are consistent with the prediction that species with low dispersal rates and reduced gene flow display high degrees of genetic population structure (Slatkin 1987;Bohonak 1999).…”

Levels and patterns of genetic diversity in wild Chrysichthys nigrodigitatus in the Lagos Lagoon complex

“…The results show that some individuals from PRE may have introgressed mtDNA from WAK or were wrongly identified as C. nigrodigitatus. However, among Japanese freshwater bagrids, Watanabe and Nishida (2003) found a divergence of 0.7 to 8.0% and 0.4% to 13.2% sequence divergence among haplotypes of Lates calcarifer (Chenoweth et al, 1998) for the same mtDNA region, values comparable to our result. Therefore, combination of both mtDNA and nuclear DNA markers must be employed to resolve this problem.…”

Variasi DNA Mitokhondria dari Ikan kakap Putih Budidaya dan Dari Tangkapan Liar Di Thailand

“…Population differentiation between two wild populations was highly significant, indicating strong population structure in Thailand. This pattern of population structure is concordant with life history and dispersal pattern of L. calcarifer that tend to migrates in closed river system (Salini & Shaklee, 1988;Chenoweth et. al., 1998;Doupe et al, 1999).…”

Influence of life‐history variation on the genetic structure of two sympatric salamander taxa

“…Associations between dispersal ability and populationlevel genetic structure or phylogeographical patterns have been established for a variety of species (Chenoweth et al 1998;Bohonak 1999;Dawson et al 2002;Kelly & Eernisse 2007). The patterns observed in this study are consistent with the prediction that species with low dispersal rates and reduced gene flow display high degrees of genetic population structure (Slatkin 1987;Bohonak 1999).…”

Levels and patterns of genetic diversity in wild Chrysichthys nigrodigitatus in the Lagos Lagoon complex

“…The results show that some individuals from PRE may have introgressed mtDNA from WAK or were wrongly identified as C. nigrodigitatus. However, among Japanese freshwater bagrids, Watanabe and Nishida (2003) found a divergence of 0.7 to 8.0% and 0.4% to 13.2% sequence divergence among haplotypes of Lates calcarifer (Chenoweth et al, 1998) for the same mtDNA region, values comparable to our result. Therefore, combination of both mtDNA and nuclear DNA markers must be employed to resolve this problem.…”

Variasi DNA Mitokhondria dari Ikan kakap Putih Budidaya dan Dari Tangkapan Liar Di Thailand

“…Population differentiation between two wild populations was highly significant, indicating strong population structure in Thailand. This pattern of population structure is concordant with life history and dispersal pattern of L. calcarifer that tend to migrates in closed river system (Salini & Shaklee, 1988;Chenoweth et. al., 1998;Doupe et al, 1999).…”

Influence of life‐history variation on the genetic structure of two sympatric salamander taxa

“…Associations between dispersal ability and populationlevel genetic structure or phylogeographical patterns have been established for a variety of species (Chenoweth et al 1998;Bohonak 1999;Dawson et al 2002;Kelly & Eernisse 2007). The patterns observed in this study are consistent with the prediction that species with low dispersal rates and reduced gene flow display high degrees of genetic population structure (Slatkin 1987;Bohonak 1999).…”