نتایج جستجو برای: e affinis
تعداد نتایج: 1018074 فیلتر نتایج به سال:
the species of larinus spp. feed on developing achiness of flowerhead of plants in the family asteraceae and cause decrease in seed production of these plants. in this study, the life cycle parameters of the weevil larinus affinis fremuth on echinops aucheri boisswere studied in kerman under natural conditions during 2010 and 2011. this weevil overwintered as adults under ground litter. the fem...
Maintenance of genetic variation at loci under selection has profound implications for adaptation under environmental change. In temporally and spatially varying habitats, non-neutral polymorphism could be maintained by heterozygote advantage across environments (marginal overdominance), which could be greatly increased by beneficial reversal of dominance across conditions. We tested for revers...
Colonizations from marine to freshwater environments constitute among the most dramatic evolutionary transitions in the history of life. Colonizing dilute environments poses great challenges for acquiring essential ions against steep concentration gradients. This study explored the evolution of body fluid regulation following freshwater invasions by the copepod Eurytemora affinis. The goals of ...
Chemosensory-related gene (CRG) families have been studied extensively in insects, but their evolutionary history across the Arthropoda had remained relatively unexplored. Here, we address current hypotheses and prior conclusions on CRG family evolution using a more comprehensive data set. In particular, odorant receptors were hypothesized to have proliferated during terrestrial colonization by...
Calanoid copepods represent a major component of the plankton community. These small animals reside in constantly flowing environments. Given the fundamental role of behaviour in their ecology, it is especially relevant to know how copepods perform in turbulent flows. By means of three-dimensional particle tracking velocimetry, we reconstructed the trajectories of hundreds of adult Eurytemora a...
Growth of regular echinoids, expressed as test diameter through time, generally shows a sigmoidal pattern. However, when urchin size is considered in terms of test volume we show that growth of the deep-sea echinoid Echinus affinis is ultimately linear, rather than saturating. We construct a simple allometric model of energy allocation that produces linear growth in volume in mature urchins by ...
This paper describes three species of the genus Tripyla from New Zealand and provides a key to species based on the morphology of females. Tripyla daviesae sp. nov. is characterized by its short body length (L = 1143-1363 μm), relatively anterior vulva (V = 50-51%), and the length of the gubernaculum (13-17 μm). Tripyla tirau sp. nov. is characterized by its relatively posterior vulva (V = 55.5...
Five insect biological control agents that attack flower heads of spotted knapweed, Centaurea stoebe L. subsp. micranthos (Gugler) Hayek, became established in western Montana between 1973 and 1992. In a controlled field experiment in 2006, seed-head insects reduced spotted knapweed seed production per seed head by 84.4%. The seed production at two sites in western Montana where these biologica...
Antibiotics are a relatively common disturbance to the normal microbiota of humans and agricultural animals, sometimes resulting in severe side effects such as antibiotic-associated enterocolitis. Gambusia affinis was used as a vertebrate model for effects of a broad-spectrum antibiotic, rifampicin, on the skin and gut mucosal microbiomes. The fish were exposed to the antibiotic in the water co...
Lindgren multiple-funnel traps, baited with (-)-cc-pinene and (k)-pityol, captured significant numbers of the weevils, Pissodes afjnis Randall and P. fascia&s LeConte, in a coastal stand of Douglas-fir and western white pine.
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