Mating occurs on the larval host plant in allRhagoletis species (Diptera: Tephritidae). We show how this attribute, when coupled with certain differences in other biological traits, strongly influences the mode of speciation. In species of thesuavis species group, host shifts have never occurred during speciation, and larvae feed in the husks of any walnut species(Juglans spp.), which are highly t...... hiện toàn bộ
The plant-to-plant movement of insects in one of the factors determining the distribution of individuals in insect populations. In this report the movement of barley aphids was analyzed by a statistical model. The model is represented as the convolution of three probability functions:
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Yukibumi Kaneko, Keisuke Nakata, Takashi Saitoh, Nils Chr Stenseth, Ottar N. Bjørnstad
The biology of the gray-sided voleClethrionomys rufocanus in Hokkaido, concerning taxonomy, morphology, phylogeny, distribution, and natural history, is reviewed. Applied issues in forest management (damage, control and census) are also mentioned. AlthoughClethrionomys rufocanus of Hokkaido was originally identified as a distinct species,Evotomys (=nowClethrionomys) bedfordiae Thomas, 1905, curren...... hiện toàn bộ
An equation is given for the estimation of selective values from data obtained by mark-recapture experiments, assuming that selective pressures remain constant while the experiments are carried out. The equation does not have an explicit solution but can readily be solved using a trial-and-error method. The use of the equation is illustrated on some data reported byKettlewell
et al...... hiện toàn bộ
Susceptible houseflies,Musca domestica, were released at a waste disposal site to control insecticide resistance in a field housefly population. In the first experiment, a total of 163,000 pupae of the susceptible Takatsuki strain were released in October–November 1977. LD50 values to fenitrothion and diazinon decreased to about one-sixth in April 1978, five months after the releases, of those bef...... hiện toàn bộ
Một phương pháp phân tích mẫu không gian sử dụng các ô mẫu với kích thước khác nhau được phát triển dựa trên mối quan hệ giữa mật độ trung bình (m) và độ dày trung bình $$\mathop m\limits^*$$. Phân tích hồi quy $$\mathop m\limits^*$$ trên m thu được từ các thay đổi liên tiếp về kích thước ô mẫu trong cùng một quần thể (quan hệ đơn vị) cho thấy một mẫu đặc trưng theo loại phân bố. Bằng cách sử dụng...... hiện toàn bộ