Abstract
The seven taxa of the cicada genus Tibicina (T.corsica corsica, T. corsica fairmairei, T. garricola, T. haematodes, T. nigronervosa, T. quadrisignata, T. tomentosa) which occur in continental France and Corsica were investigated. Extrinsic factors (geographical barriers) and factors intrinsic to the ecology of species were considered in an effort to understand the biogeography of Tibicina. Three patterns related to intrinsic factors were recognised: (1) pairs of taxa with sympatric distributions but with divergent habitat preferences; (2) pairs of taxa with sympatric distributions and similar habitat but with allochronic occurrence; (3) pairs of taxa with similar ecology but with allopatric distributions. When taxa were separated by their habitat, the height of vegetation appeared to be more important than the floristic composition of the habitat. These factors lead to the partitioning of resources in time and space. All taxa occur in secondary vegetations. Human agro-pastoral activity has probably influenced the dynamics of cicada populations and the maintenance of isolation between them.
Highlights
The genetic integrity of species is commonly supposed to be maintained through premating and postmating iso lating mechanisms (Dobzhansky, 1947; Mayr, 1942, 1963), the former corresponding broadly to Paterson’s specific-mate recognition systems (SMRSs) (Paterson, 1985)
The Tibicina material of Muséum national d’Histoire naturelle (MNHN) was examined via 30 specimens of T. c. cor sica, 41 of T. c. fairmairei, 68 of T. garricola, 414 of T. haema todes, 48 of T. nigronervosa, 36 of T. quadrisignata and 21 of T. tomentosa
A disjunction related to the Rhone Valley is observed in the distributions of T. garricola, T. haematodes and T. quadrisignata
Summary
The genetic integrity of species is commonly supposed to be maintained through premating and postmating iso lating mechanisms (Dobzhansky, 1947; Mayr, 1942, 1963), the former corresponding broadly to Paterson’s specific-mate recognition systems (SMRSs) (Paterson, 1985). As with many other animals, the premating processes that maintain isolation between species are mainly investigated by studying traits such as their spatial distribution (De Boer, 1995), ecological pref erences (Denno et al, 2001), exchanges of specific infor mation in courtship (Claridge, 1990) and structural genitalic morphology (Soulier-Perkins & Bourgoin, 1998). Behavioural premating isolating mechanisms in cicadas have been widely studied through the analysis of sound communication between the sexes during pair formation (Sueur, 2001). In spite of a significant recent contribution to the knowledge of French cicadas (see Boulard & Mondon, 1996), little is still known about the distribution and ecology of the Palaearctic genus Tibicina. The genus is widespread in France including the island of Corsica, with six species and one subspecies
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