Rebekka Gadeberg - Academia.edu (original) (raw)
Address: Christiansfeld, South Denmark, Denmark
less
Uploads
Papers by Rebekka Gadeberg
Biodiversity and Conservation, 2000
We investigated the genetic population structure of two rare myrmecophilous lycaenid butterflies,... more We investigated the genetic population structure of two rare myrmecophilous lycaenid butterflies, Maculinea nausithous and M. teleius, which often live sympatrically and have similar biology. In Europe, both species occur in highly fragmented populations and are vulnerable to local extinction. The proportion of variable allozyme loci, average heterozygosity and genetic differentiation among populations was higher in M. nausithous than in sympatrically living M. teleius populations. We hypothesise that the differences in heterozygosity are mainly due to the known higher efficiency of typical host ant nests in rearing M. nausithous pupae compared to M. teleius pupae. This implies a larger probability of larval survival in M. nausithous, which buffers populations against environmental and demographic stochasticity. In contrast, the lower carrying capacity of ant nests in rearing M. teleius pupae requires higher nest-densities and makes M. teleius populations more prone to losing genetic variation through drift if this condition is not fulfilled. The single investigated Russian population of M. teleius showed much higher levels of heterozygosity than any of the Polish populations, suggesting a more viable and still intact metapopulation structure.
Journal of Insect Conservation, 1997
We have investigated the genetic population structure within and the genetic differentiation betw... more We have investigated the genetic population structure within and the genetic differentiation between local populations of the large blue butterfly Maculinea alcon throughout the Jutland peninsula. Samples were collected as eggs on foodplants (Gentiana pneumonanthe), and reared to 4th instar caterpillars in the laboratory. A significant excess of homozygotes was found for all the investigated allozyme loci in most of the populations. A North-South cline was observed for the allele frequencies at some of the loci and for several linkage groups. Because some of the allele frequency clines were parallel to clines in adult morphological variation, we interpret our results as evidence for the co-existence of at least two gene pools within the Danish Maculinea alcon populations. Multilocus electrophoretic data revealed highly positive but variable FST values, which under this scenario would reflect varying frequencies of the Maculinea gene pools across the local populations. The significantly positive FIS values indicate that these gene pools are at least partly reproductively isolated (Wahlund effect). The co-occurrence of several Maculinea alcon gene pools on many local sites in Jutland is of great importance for conservation of the fragmented Maculinea populations. Our results show that there is probably more Maculinea biodiversity to conserve than was previously thought, and suggests that extant populations are more fragmented and vulnerable than counts of flying adults or eggs on foodplants indicate.
Biodiversity and Conservation, 2000
We investigated the genetic population structure of two rare myrmecophilous lycaenid butterflies,... more We investigated the genetic population structure of two rare myrmecophilous lycaenid butterflies, Maculinea nausithous and M. teleius, which often live sympatrically and have similar biology. In Europe, both species occur in highly fragmented populations and are vulnerable to local extinction. The proportion of variable allozyme loci, average heterozygosity and genetic differentiation among populations was higher in M. nausithous than in sympatrically living M. teleius populations. We hypothesise that the differences in heterozygosity are mainly due to the known higher efficiency of typical host ant nests in rearing M. nausithous pupae compared to M. teleius pupae. This implies a larger probability of larval survival in M. nausithous, which buffers populations against environmental and demographic stochasticity. In contrast, the lower carrying capacity of ant nests in rearing M. teleius pupae requires higher nest-densities and makes M. teleius populations more prone to losing genetic variation through drift if this condition is not fulfilled. The single investigated Russian population of M. teleius showed much higher levels of heterozygosity than any of the Polish populations, suggesting a more viable and still intact metapopulation structure.
Journal of Insect Conservation, 1997
We have investigated the genetic population structure within and the genetic differentiation betw... more We have investigated the genetic population structure within and the genetic differentiation between local populations of the large blue butterfly Maculinea alcon throughout the Jutland peninsula. Samples were collected as eggs on foodplants (Gentiana pneumonanthe), and reared to 4th instar caterpillars in the laboratory. A significant excess of homozygotes was found for all the investigated allozyme loci in most of the populations. A North-South cline was observed for the allele frequencies at some of the loci and for several linkage groups. Because some of the allele frequency clines were parallel to clines in adult morphological variation, we interpret our results as evidence for the co-existence of at least two gene pools within the Danish Maculinea alcon populations. Multilocus electrophoretic data revealed highly positive but variable FST values, which under this scenario would reflect varying frequencies of the Maculinea gene pools across the local populations. The significantly positive FIS values indicate that these gene pools are at least partly reproductively isolated (Wahlund effect). The co-occurrence of several Maculinea alcon gene pools on many local sites in Jutland is of great importance for conservation of the fragmented Maculinea populations. Our results show that there is probably more Maculinea biodiversity to conserve than was previously thought, and suggests that extant populations are more fragmented and vulnerable than counts of flying adults or eggs on foodplants indicate.