منابع مشابه
Polyandry in social Hymenoptera — disunity in diversity?
Multiple mating by queens occurs in many species of social Hymenoptera despite its likely costs. Hypotheses to explain multiple mating include a need for more sperm than provided by a single male, the convergence of queen and worker sex-allocation optima and various genetic diversity hypotheses. For some species the sperm need hypothesis fails since queens retain only a single male’s worth of s...
متن کاملKaryotypic diversity in the subfamily Eurytominae (Hymenoptera: Eurytomidae).
New data on the karyotype structure of five species of the subfamily Eurytominae are described, including the following species: Eurytoma rosae (2n = 20), E. robusta (n =7, 2n = 14), E. serratulae (n = 6, 2n = 12), E. compressa (2n = 10) and Sycophila biguttata (2n = 18). 2n = 10, 12 and 14 are reported for the first time for the Eurytominae, in which only 2n = 20 and 18 have been previously fo...
متن کاملDiversity of Chalcidoidea (Hymenoptera) at El Edén Reserve, Mexico
Animal diversity is declining worldwide, and our efforts to document this change are hampered by inaccurate estimates of the true number of species. The number of described (formally named) species has been estimated to be between 1.2–2.2 million (Stork 1988; Grove & Stork 2000), with insects by far the most dominant group (751,012 species according to Arnett 1985). As groups are revised and ty...
متن کاملDiversity and Conservation of Leaf Cutter Bees (Hymenoptera: megachilidae)
More than one-third of the world’s crops require pollination to set seeds and fruits Dias et al. [1]. It is likely that wild bee community is sufficient to provide services for multiple crops, including some that are not serviced by honeybees Kremen et al. [2]. Under several situations non-Apis bees are better pollinators than Apis species because of efficient tripping, fast foraging rate, long...
متن کاملDiversity in bee (Hymenoptera: Apoidea) and social wasp (Hymenoptera: Vespidae, Polistinae) community in "campos rupestres", Bahia, Brazil.
Hymenoptera such as bees and social wasps are regular floral visitors in "campos rupestres" vegetation. A community of bees and social wasps was studied during floral visitation in an area of "campos rupestres", at Chapada Diamantina, BA, Brazil, from September 2001 to April 2002. The community was described in relation to diversity, evenness, and dominance rank, considering the individuals abu...
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ژورنال
عنوان ژورنال: Evolution
سال: 1985
ISSN: 0014-3820,1558-5646
DOI: 10.1111/j.1558-5646.1985.tb04091.x