منابع مشابه
Population structure in relation to host-plant ecology and Wolbachia infestation in the comma butterfly.
Experimental work on Polygonia c-album, a temperate polyphagous butterfly species, has shown that Swedish, Belgian, Norwegian and Estonian females are generalists with respect to host-plant preference, whereas females from UK and Spain are specialized on Urticaceae. Female preference is known to have a strong genetic component. We test whether the specialist and generalist populations form resp...
متن کاملHost plant choice in the comma butterfly-larval choosiness may ameliorate effects of indiscriminate oviposition.
In most phytophagous insects, the larval diet strongly affects future fitness and in species that do not feed on plant parts as adults, larval diet is the main source of nitrogen. In many of these insect-host plant systems, the immature larvae are considered to be fully dependent on the choice of the mothers, who, in turn, possess a highly developed host recognition system. This circumstance al...
متن کاملThe re-expansion and improving status of the silver-spotted skipper butterfly (Hesperia comma) in Britain: a metapopulation success story
Many specialist species are declining as a result of habitat loss and fragmentation, such that conservation actions typically aim to stem rates of decline rather than bring about genuine recovery. Here, we document the recovery of a species from former population refuges. An extensive survey of the entire British range ofHesperia comma, conducted in 2000, recorded over three times the number of...
متن کاملComma checking in Danish
This paper describes research in using the Brill tagger (Brill 94,95) to learn to identify incorrect commas in Danish. Trained on a part-of-speech tagged corpus of 600,000 words, the system identifies incorrect commas with a precision of 91% and a recall of 77%. The system was developed by randomly inserting commas in a text, which were tagged as incorrect, while the original commas were tagged...
متن کاملInvestigation of the Flow and Cavitation in a Butterfly Valve
Since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated in this paper. In reality, the investigation of the loss coefficient and torque from some experiments will take a long time and a lot of money. This paper presents a statistical study of the flow past the butterfly valve in a static analysis using com...
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ژورنال
عنوان ژورنال: Nature
سال: 1929
ISSN: 0028-0836,1476-4687
DOI: 10.1038/124653b0