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Sandra Thorén Franziska Quietzsch Doreen Schwochow Lalandy Sehen Christopher Meusel Kate Meares Ute Radespiel 《International journal of primatology》2011,32(3):566-586
Because closely related species are likely to be ecologically similar owing to common ancestry, they should show some degree
of differentiation in order to coexist. We studied 2 morphologically similar congeneric species, the golden-brown mouse lemur
(Microcebus ravelobensis) and the gray mouse lemur (M. murinus). These species are found in partial sympatry in the dry deciduous forest in northwestern Madagascar. We investigated whether
1) feeding niche differentiation and/or 2) a reduction in locomotor activity during periods of food shortage, which might
reflect an energy saving strategy, can explain the coexistence of these 2 lemur species. To obtain feeding and behavioral
data, we conducted focal observations of 11 female Microcebus murinus and 9 female M. ravelobensis during 11 months from 2007 to 2008 and collected fecal samples for 6 mo. We monitored the phenology of 272 plant specimens
and trapped arthropods to determine food availability. Results revealed interspecific differences in 1) relative proportion
of consumed food resources, resulting in a merely partial dietary overlap, and in 2) relative importance of seasonally varying
food resources throughout the year. In addition, females of Microcebus murinus showed a reduction in locomotor activity during the early dry season, which might reflect an energy-saving strategy and might
further reduce potential competition with M. ravelobensis over limited food resources. To conclude, a combination of interspecific feeding niche differentiation and differences in
locomotor activity appears to facilitate the coexistence of Microcebus murinus and M. ravelobensis. 相似文献
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Nizar Jamal Haddad Adjlane Noureddine Banan Al‐Shagour Wahida Loucif‐Ayad Mogbel A. A. El‐Niweiri Eman Anaswah Wafaa Abu Hammour Dany El‐Obeid Albaba Imad Mohamed A. Shebl Abdulhusien Sehen Almaleky Abdullah Nasher Nagara Walid Mohamed Fouad Bergigui Orlando Yañez Joachim R. de Miranda 《Insect Science》2017,24(1):103-113
Three hundred and eleven honeybee samples from 12 countries in the Middle East and North Africa (MENA) (Jordan, Lebanon, Syria, Iraq, Egypt, Libya, Tunisia, Algeria, Morocco, Yemen, Palestine, and Sudan) were analyzed for the presence of deformed wing virus (DWV). The prevalence of DWV throughout the MENA region was pervasive, but variable. The highest prevalence was found in Lebanon and Syria, with prevalence dropping in Palestine, Jordan, and Egypt before increasing slightly moving westwards to Algeria and Morocco Phylogenetic analysis of a 194 nucleotide section of the DWV Lp gene did not identify any significant phylogenetic resolution among the samples, although the sequences did show consistent regional clustering, including an interesting geographic gradient from Morocco through North Africa to Jordan and Syria. The sequences revealed several clear variability hotspots in the deduced amino acid sequence, which furthermore showed some patterns of regional identity. Furthermore, the sequence variants from the Middle East and North Africa appear more numerous and diverse than those from Europe. 相似文献
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