Papers by Tom Van Der Have
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... AND METHODS Study areas Boteti River (2Oo21'S, 24'43'E) The main s... more ... AND METHODS Study areas Boteti River (2Oo21'S, 24'43'E) The main study site was situated along the Boteti River about 40 km southeast of Maun (Figure 1). This river is fed by the Okavango Delta to which the Boteti is connected by the Thamalakane (Ellery & McCarthy 1994 ...
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ABSTRACT Recent reviews have shown that hybridisation among ant species is likely to be more comm... more ABSTRACT Recent reviews have shown that hybridisation among ant species is likely to be more common than previously appreciated. but that documented cases of introgression remain rare. After molecular phylogenetic work had shown that European Lasius niger (LINNAEUS, 1758) and L. psammophilus SEIFERT, 1992 (formerly L. alienus (FOERSTER. 1850)) are unlikely to be very closely related, we decided to analyse an old data set confirming the conclusion by PEARSON (1983) that these two ants can indeed form viable hybrids. We show that signatures of introgression can be detected in a Danish site and that interspecific gene-flow is asymmetrical (only from L. niger into L. psammophilus) as inferred previously by Pearson for the southern England site that he studied and from which we also collected data. We compare the observed patterns of hybridisation and introgression in the Danish and British site and infer that overlap in nuptial flights in Denmark may have contributed to the higher frequency of introgressed genes relative to the southern England site where nuptial flights are clearly separated in time. We also report the first mating system data for L. psammophilus. showing that this species has facultative multiple mating of queens similar to L. niger. We suggest that L. psammoplillus-niger introgression may be much more common than previously appreciated, which would explain that European myrmecologists have often found it difficult to distinguish between these species at sites where they occur sympatrically. This would imply that multiple accessible field sites are available to study the molecular details of hybridisation and introgression between two ant species that have variable degrees of sympatiy throughout their distributional ranges
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Zoology in the Middle East, 2002
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Journal of Theoretical Biology, 1996
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The Journal of Animal Ecology, 1982
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Ibis, 2006
We studied phenology, staging time and refuelling in Broad-billed Sandpipers Limicola falcinellus... more We studied phenology, staging time and refuelling in Broad-billed Sandpipers Limicola falcinellus stopping over during spring migration in the Sivash (Black Sea, Ukraine) in May 1991–94. In the study area, peak staging numbers of 2000–2500 individuals occurred in the third week of May. In May 1993, 460 birds were marked with a yellow dye and 126 of these were colour-ringed. Before 28 May no departure of birds dyed yellow could be detected; by 3 June all birds had departed. Colour-ringed adults in mid May 1993 staged for a ...
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Evolution, 1988
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Behavioral Ecology and Sociobiology, 1988
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Bulletin 110 …, 2006
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Papers by Tom Van Der Have