. The Canadian field-naturalist. Natural history; Sciences naturelles. 2005 Gomez-Zurita: New Records and Biogeography of Callicrapha 97. Atlantic itral American A Florida Figure 2. Calligrapha species numbers in North American provinces and states. Thick lines roughly demarcate faunistic groups in the genus according to their geographic distribution. Calligrapha stands out among leaf beetles because it includes several parthenogenetic species, otherwise very unusual among the Chrysomelidae (Brown 1945; Robertson 1966; Cox 1996; Gomez-Zurita et al. 2004). It is noteworthy that all asexual spec
. The Canadian field-naturalist. Natural history; Sciences naturelles. 2005 Gomez-Zurita: New Records and Biogeography of Callicrapha 97. Atlantic itral American A Florida Figure 2. Calligrapha species numbers in North American provinces and states. Thick lines roughly demarcate faunistic groups in the genus according to their geographic distribution. Calligrapha stands out among leaf beetles because it includes several parthenogenetic species, otherwise very unusual among the Chrysomelidae (Brown 1945; Robertson 1966; Cox 1996; Gomez-Zurita et al. 2004). It is noteworthy that all asexual species in Calligrapha belong to the "Great Lakes" group and have typically restricted ranges (with the possible exceptions of C alnicola and C suturellcr, Figures lb and lo). This example of geographical parthenogenesis is however difficult to reconcile with current hypotheses relating this reproductive mode with better colonizing abilities, highest adaptability through generalist behavior or lonal microadaptation, and/or advantages on environ- ments with reduced biotic (particularly parasitic) inter- actions (Haag and Ebert 2004, and references there- in). The parthenogenetic Calligrapha species coexist in close sympatry with several other sexually reproduc- ing taxa (Brown 1945) and moreover we have hypoth- esized that interspecific hybridization might be the mechanism behind the origin of asexuality in Calli- grapha (Gomez-Zurita et al. 2004), not existing rea- sons a priori suggesting interspecific hybridization to occur following any geographical pattern. Again, phy- logenetic studies are needed to provide sound answers to these questions relevant for the biogeography, sys- tematics and evolution of such an remarkable genus, Calligrapha (Gomez-Zurita and collaborator, in prepa- ration).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
Size: 1561px × 1600px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, books, booksubjectnaturalhistory
