Tesis de Licenciatura: Diferencias en tamaño y Asimetría Fluctuante en individuos y castas de la abeja sin aguijón Melipona beecheii Benett (Hymenoptera: Apidae: Meliponini)
jueves, 17 de marzo de 2016
jueves, 3 de marzo de 2016
sábado, 27 de febrero de 2016
UN Report: Pollinators Vital to Our Food Supply Under Threat
Reporte de las Naciones Unidas: Polinizadores vitales para nuestro suministro alimenticio en riesgo
By the numbers
- 20,000 – Number of species of wild bees. There are also some species of butterflies, moths, wasps, beetles, birds, bats and other vertebrates that contribute to pollination.
- 75% – Percentage of the world's food crops that depend at least in part on pollination.
- US$235 billion–US$577 billion – Annual value of global crops directly affected by pollinators.
- 300% -- Increase in volume of agricultural production dependent on animal pollination in the past 50 years.
- Almost 90% -- Percentage of wild flowering plants that depend to some extent on animal pollination.
- 1.6 million tonnes – Annual honey production from the western honeybee.
- 16.5% -- Percentage of vertebrate pollinators threatened with extinction globally.
- +40% – Percentage of invertebrate pollinator species – particularly bees and butterflies – facing extinction
miércoles, 6 de enero de 2016
viernes, 11 de diciembre de 2015
Domínguez-Ayala R., Moo-Valle H., May-Itzá W. de J., Medina-Peralta S., Quezada-Euán, J. J. G. (2016) Stock composition of northern neotropical honey bees: mitotype and morphotype diversity in México (Hymenoptera: Apidae). Apidologie 47: 642-652
Abstract – The stock of honey bees in the northern neotropics is likely a composite of European and African lineages, but the genetic makeup of most populations in this region has remained unstudied.We analyzed the genetic composition of honey bees across temperate and tropical regions of Mexico using mitochondrial and morphometric analyses. The results showed that honey bees from Mexico are descendent almost in similar proportion from matrilines of African and European origins. However, morphometrics indicate that most colonies are the result of extensive introgressive hybridization with Africanized bees.While large-scale displacement of European honey bees seems to have occurred in the tropical regions, higher frequencies of colonies with a mixed range of African- European markers were identified in the temperate areas. Our results suggest that the outcome of the hybridization between Africanized and European honey bees in Mexico has been significantly associated with climate.
PDF Apidologie
martes, 1 de diciembre de 2015
DFG PROJECT
TITLE: Phenotypic plasticity and reproduction-longevity life-history trade-off: investigating the underlying basis in an orchid bee at the cusp of sociality
In collaboration with , MLU Halle-Wittenberg Project Leader: Professor Robert J. Paxton
Summary: Socially polymorphic
species, in which different members of the same species
exhibit either solitary or social behaviour, provide unrivalled model systems
for exploring the role of sociality in fundamental biological processes. Using
a socially polymorphic orchid bee species which can be induced to nest in
artificial observation boxes in the field, we shall describe the gene
expression profiles of solitary and social (worker and queen) phenotypes to
identify key genes underpinning the genetic bauplan of eusociality. By
experimentally enhancing/diminishing brood food, we shall test the
longevity-reproduction trade-off in the solitary phenotype and test whether
there exists a longevity-reproduction correlation in the eusocial phenotype,
and use gene expression profiles to identify its genetic basis.
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