. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Geographic variation in Gallotia galloti 535 Gomera ? 9 Tenerife Fig. 1a ? Hierro La Palma o- out-group root Fig. 1b La Palma. Hierro Fig. 1 a: Unrooted Wagner tree. Fig. 1 b: Line joining localities (solid circles) is the selec- tion gradient implied by a "current selection" interpretation of the unrooted tree of Fig. 1 a. (1) 'Current ecology' — Irrespective of whether the galloti tree is rooted by the outgroup (Fi
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Geographic variation in Gallotia galloti 535 Gomera ? 9 Tenerife Fig. 1a ? Hierro La Palma o- out-group root Fig. 1b La Palma. Hierro Fig. 1 a: Unrooted Wagner tree. Fig. 1 b: Line joining localities (solid circles) is the selec- tion gradient implied by a "current selection" interpretation of the unrooted tree of Fig. 1 a. (1) 'Current ecology' — Irrespective of whether the galloti tree is rooted by the outgroup (Fig. 1 a) or the mid-point then there is no link between extent of divergence and 'time' of divergence, the branches nearer the root are not longer. Consequently, one cannot reject the hypothesis that the pattern of geo- graphic variation is primarily due to selection for current ecological conditions. That is, a selection gradient between the two extreme populations, Hierro and La Palma, could exist that results in the pattern of geographic variation and explains the linkage of the samples on the tree in the order Hierro — Gomera — S. Tenerife — Tenerife — La Palma. Gene flow is unlikely to be impor- tant in the pattern of inter-island affinities as the islands are all widely separa- ted so rafting between islands could not be sufficient to be of any significant magnitude. Moreover, the sea between current main islands is far too deep for the islands to be have been joined to allow recent gene flow between islands. (2) 'Phylogenesis' — The pattern of anagenesis in the cladogram could also reflect phylogenetic relationships. Since all the main islands occupied by galloti have been separated for a very substantial period of time the phylogene- tic interpretation of the differentiation between islands is considered (in this first instance) to be on the basis of dispersal (presumably by rafting) rather than vicariance. The interpretation of the differenti
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