Researches on Population Ecology

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Vertical foodweb structure of freshwater zooplankton assemblages estimated by stable nitrogen isotopes
Researches on Population Ecology - Tập 38 - Trang 283-287 - 1996
R. France, K. Westcott, P. del Giorgio, G. Klein, J. Kalff
Although theoretical foodweb models predict the presence of only three to four trophic categories, estimation of “potential” vertical foodweb structure from species lists and inferred feeding interactions suggest that as many as 7 trophic categories can occur in the pelagic foodwebs of North American glaciated lakes. A compilation of data on the nitrogen isotopic composition of zooplankton from 46...... hiện toàn bộ
Evolution of condition-dependent dispersal: A genetic-algorithm search for the ESS reaction norm
Researches on Population Ecology - Tập 39 - Trang 127-137 - 1997
Hideo Ezoe, Yoh Iwasa
Many insects produce two types (winged and wingless) of offspring that greatly differ in dispersal ability. The ratio of the two types often depends on the quality of the local habitat and the crowding experienced by the mother. Here we studied the condition-dependent dispersal that is evolutionarily stable. The model is also applicable to annual plants that produce two types of seeds differing in...... hiện toàn bộ
The evolution of dispersal polymorphisms in insects: The influence of habitats, host plants and mates
Researches on Population Ecology - Tập 36 - Trang 127-135 - 1994
Robert F. Denno
Wing-dimorphic, delphacid planthoppers were used to test hypotheses concerning the effects of habitat persistence and architectural complexity on the occurrence of dispersal. For reasons concerning both the durational stability of the habitat and the reduced availability of mates, selection has favored high levels of dispersal in species occupying temporary habitats. Flightlessness predominates in...... hiện toàn bộ
Comparative study of density regulation in confined populations of four species of rodents
Researches on Population Ecology - Tập 7 - Trang 57-72 - 1965
W. Z. Lidicker
Biology ofhyphantria cunea drury (lepidoptera : Arctiidae) in Japan. IX. population dynamics
Researches on Population Ecology - Tập 11 - Trang 211-228 - 1969
Yosiaki Itô, Atsuhiro Shibazaki, Osamu Iwahashi
Fluctuations in population density ofHyphantria cunea in Japan are characterized by a gradation-like pattern. Analysis of the life table data taken from two stations during eight successive generations showed that (1) mortality during egg and early larval stages was density-independent, (2) mortality during later larval stages wasinversely density-dependent, and (3) mortality during prepupal and p...... hiện toàn bộ
A simple model of host-parasitoid interaction with host-feeding
Researches on Population Ecology - Tập 30 - Trang 353-369 - 1988
Norio Yamamura, Eizi Yano
A simple mathematical model of host-parasitoid interaction with host-feeding was presented with special reference to the system of the greenhouse whitefly and the parasitoidEncarsia formosa. In the model, when a parasitoid encounters a host, it has a choice between feeding the host and ovipositing one egg in the host. It was shown that an intermediate value of the feeding ratio of all attacks give...... hiện toàn bộ
Territory establishment of young bio-clawed shrew,Sorex unguiculatus (Dobson) (Insectivora, Soricidae)
Researches on Population Ecology - Tập 30 - Trang 83-93 - 1988
Tadayuki Inoue
Consequences of competition on the reproduction and mortality of three species of terrestrial slugs
Researches on Population Ecology - Tập 25 - Trang 20-43 - 1983
C. David Rollo
The interaction of three species of terrestrial slugs was studied in six field cages containing monocultures and 2-way combinations.A. columbianus andA. ater were non-aggressive species andL. maximus was highly aggressive during the summer. All three species were similar in body design and resource utilization. Reproduction (egg size, eggs/batch, number of batches, wet-weight productivity) and mor...... hiện toàn bộ
An approach to the edge effect in proof of the validity ofDice's assessment lines in small-mammal censusing
Researches on Population Ecology - Tập 15 - Trang 121-137 - 1973
Ryo Tanaka
A second fieldwork for the sake of solving the edge-effect subject was carried out in almost the same ways and plans in summer of 1971 in succession to that of 1970. It was found out that the population density was reduced to two-thirds, but the data were sufficient to form the subsequent conclusions: ...... hiện toàn bộ
Studies on the interference among larvae of the citrus leaf miner,Phyllocnistis citrella stainton (lepidoptera: Phyllocnistidae)
Researches on Population Ecology - Tập 16 - Trang 80-111 - 1974
Minoru Murai
Observation of the citrus leaf miner,Phyllocnistis citrella Stainton suggested that contacts among larvae frequently occur and either of two larvae encountered is sometimes killed by the interference. A model to describe the competitive interactions in the process of interference was constracted with this species. The distribution of hatchling on an area was considered in t...... hiện toàn bộ
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