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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Water Stress Strengthens Mutualism Among Ants, Trees, And Scale Insects, Elizabeth G. Pringle, Erol Akc¸Ay, Ted K. Raab, Rodolfo Dirzo, Deborah M. Gordon
Water Stress Strengthens Mutualism Among Ants, Trees, And Scale Insects, Elizabeth G. Pringle, Erol Akc¸Ay, Ted K. Raab, Rodolfo Dirzo, Deborah M. Gordon
Ted K. Raab
Abiotic environmental variables strongly affect the outcomes of species interactions. For example, mutualistic interactions between species are often stronger when resources are limited. The effect might be indirect: water stress on plants can lead to carbon stress, which could alter carbon-mediated plant mutualisms. In mutualistic ant–plant symbioses, plants host ant colonies that defend them against herbivores. Here we show that the partners’ investments in a widespread ant–plant symbiosis increase with water stress across 26 sites along a Mesoamerican precipitation gradient. At lower precipitation levels, Cordia alliodora trees invest more carbon in Azteca ants via phloem-feeding scale insects that provide the …
Fumigant Toxicity Of Essential Oil From Tanacetum Balsamita L. (Compositae) Against Adults And Eggs Of Callosobruchus Maculatus F. (Coleoptera: Bruchidae), Adel Khashaveh
Adel Khashaveh
The essential oil of Tanacetum balsamita L. was tested against Callosobruchus maculatus F. at the rates of 5.12, 7.23, 10.19, 14.36 and 20.24 μl/l air for adults and 5.3, 8.5, 10.8, 13.7 and 17.4 μl/l air for eggs. All experiments were conducted at 27 ± 1 °C and 65 ± 5% relative humidity. Mortality was counted after 24, 48 and 72 h of exposure and all adults (dead and alive) were taken out of the vials and the vials were left at the same conditions for further 35 days to assess progeny production. For mortality of eggs, unhatched eggs were …
Laboratory Bioassay Of Iranian Isolates Of Entomopathogenic Fungus Metarhizium Anisopliae (Metsch.) Sorokin (Ascomycota: Hypocreales) Against Two Species Of Storage Pest, Adel Khashaveh
Adel Khashaveh
Th e susceptibility of adults of Tribolium castaneum Herbst (Coleoptera: Tenebrionidae) and Oryzaephilus surinamensis L. (Coleoptera: Silvanidae) to three Iranian Isolates of the entomopathogenic fungi Metarhizium anisopliae (Metsch.) Sorokin was evaluated through bioassays with direct immersion under laboratory conditions. For each isolates, fi ve aqueous suspensions were prepared in a logarithmic series in Tween 80 (0.05% v/v). Results showed that adult of both species were susceptible to all isolates of M. anisopliae. For all three isolates, mortality percentage of the two species increased with increasing conidial concentration and signifi cant diff erence was observed between concentrations. Th e corrected cumulative …
Vertical Distribution Of Aedes Mosquitoes In Multiple Storey Buildings In Selangor And Kuala Lumpur, Malaysia, Chen Chee Dhang
Vertical Distribution Of Aedes Mosquitoes In Multiple Storey Buildings In Selangor And Kuala Lumpur, Malaysia, Chen Chee Dhang
Chen Chee Dhang
No abstract provided.
Temephos Resistance In Field Aedes (Stegomyia) Albopictus (Skuse) From Selangor, Malaysia, Chen Chee Dhang
Temephos Resistance In Field Aedes (Stegomyia) Albopictus (Skuse) From Selangor, Malaysia, Chen Chee Dhang
Chen Chee Dhang
Larvae of Aedes albopictus obtained from dengue endemic areas in Selangor, Malaysia were evaluated for their susceptibility to operational dosage of temephos (1 mg/L). Larval bioassays were carried out in accordance to modified WHO standard methods. Biochemical microassay of enzymes in Ae. albopictus was conducted to detect the emergence of insecticide resistance and to define the mechanisms involved in temephos resistance. The 50% mortality lethal time (LT50) for Ae. albopictus tested against temephos ranged between 58.65 to 112.50 minutes, with resistance ratio ranging from 0.75 - 1.45. This study addressed the fluctuation of time-related susceptibility status of Ae. albopictus towards …