. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Rana perezi in Tunisia 293. Canonical variable Fig. 5: Discriminant analysis of the mating calls of the lake frogs in Tunisia and Spain. The group centroid values are for the calls from Tunisia and — for those from Spain. toward the middle of the call. The short high-frequency call often given by the frogs in Tunisia was not documented for the populations in Los Palacios (southern Spain), but it can be heard in tape recordings from other parts of Spain
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Rana perezi in Tunisia 293. Canonical variable Fig. 5: Discriminant analysis of the mating calls of the lake frogs in Tunisia and Spain. The group centroid values are for the calls from Tunisia and — for those from Spain. toward the middle of the call. The short high-frequency call often given by the frogs in Tunisia was not documented for the populations in Los Palacios (southern Spain), but it can be heard in tape recordings from other parts of Spain (Lenné unpublished). Distribution: R. perezi is widely distributed and common in Tunisia. During the observation period R. perezi was the only species of water frogs that was caUing. A total of 24 habitats were mapped. The range within the country is disjunct. The northern Tunisian mountains and the basin of Tunis provide R. perezi with many natural habitats. The annual precipi- tation is high enough that rivers, brooks and ponds contain water all year. In addi- tion, anthropogenic biotopes offer suitable habitats such as man-made watering places and ponds in the vicinity of reservoirs or ditches along roads. In the central Tunisian steppe and in the Sahel there are no natural habitats, because the balance between precipitation and evaporation is not such as to sustain perennial bodies of water. In the agricultural regions crops such as halfa grass and olive trees are grown, which do not ordinarily require a constant supply of water by way of irrigation dit- ches and reservoirs. The few bodies of water found in the vicinity of Sousse and Sfax (small queds, watering places, ditches) were almost always severely eutrophic or polluted. In the middle part of Tunisia, therefore, R. perezi was documented at only one site. Southern Tunisia is characterized by very low precipitation, and hence by a nearly complete absence of perennial bodies of water. However, the oases provide many
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