Researches on Population Ecology

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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
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
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
The effect of the rate of successful dispersal of a Phytoseiid mite,Phytoseiulus persimilis Athias-Henriot (Acarina: Phytoseiidae) on the persistence in the interactive system between the predator and its prey
Researches on Population Ecology - Tập 18 Số 1 - Trang 210-222 - 1976
Takafuji, Akio
Dispersal behaviour was studied on a predacious phytoseiid mite,Phytoseiulus persimilis Athias-Henriot in response to the density of its prey,Tetranychus kanzawai Kishida. And the effect of the change in the rate of successful dispersal of the predators among patches was tested on the persistence of the predator-prey system. The results of the study are summarized as follows:
Sex change and spatial distribution pattern in an intertidal holothurian Polycheira rufescens in the reproductive season
Researches on Population Ecology - Tập 41 - Trang 235-242 - 1999
Seiji Arakaki, Kazunori Yamahira, Mutsunori Tokeshi
The patterns of sex change and spatial distribution in an intertidal holothurian, Polycheira rufescens (Chiridotidae; Echinodermata), were investigated on a stony beach in Amakusa, western Kyushu. Field caging experiments revealed that some individuals of P. rufescens underwent a sequential sex change from male to female via hermaphrodite stages and back to male again within a single reproductive...... hiện toàn bộ
Humid microenvironment prerequisite for the survival and growth of nymphs of the rice brown planthopper,Nilaparvata lugens (Stål) (Homoptera: Delphacidae)
Researches on Population Ecology - Tập 36 - Trang 23-28 - 1994
Somchai Isichaikul, Koichi Fujimura, Toshihide Ichikawa
Nymphs ofNilaparvata lugens were experimentally reared from the 2nd instar in a cage covering part of the leaf sheath of an individual rice plant grown in a Wagner pot. Plants were covered with the cage from the water surface of the pot to 10 cm above the surface (lower cage-group) or from 10 cm to 20 cm above the surface (upper cage-group). Temperatures measured at three different parts of the ca...... hiện toàn bộ
On the abundance ofDermatophagoides pteronyssinus (Trouessart, 1897) (Pyroglyphidae: Acarina) in house dust
Researches on Population Ecology - Tập 13 - Trang 67-79 - 1971
J. E. M. H. van Bronswijk, J. M. C. P. Schoonen, M. A. F. Berlie, F. S. Lukoschus
The dominance of the Pyroglyphidae in house dust has been influenced by a number of factors. The humidity in houses dropped recently to such an extent that only Pyroglyphidae can survive. When temperature and relative humidity are favorable forAcarus siro andGlycyphagus destructor as well asDermatophagoides pteronyssinus, Dermatophagoides diminished in numbers by competition. Introduction of the p...... hiện toàn bộ
Searching preference of the parasitoid,Anisopteromalus calandrae (Howard) for different stages of the host,Callosobruchus maculatus (F.) in the laboratory
Researches on Population Ecology - Tập 23 - Trang 177-191 - 1981
K. L. Heong
The functional response parameters of the parasitoid,Anisopteromalus calandrae (Howard) to the third instar, the fourth instar and the pupae ofCallosobruchus maculatus (F.) were estimated from the Random Parasitoid Equation. By modifying this equation for a two host situation and using the parameters estimated above, a no switch model could be obtained. This model was then used to test for switchi...... hiện toàn bộ
Annual survival rate and age structure of habu,Trimeresurus flavoviridis (Viperidae), on Minna island, Japan: Estimation from removal trapping
Researches on Population Ecology - Tập 36 - Trang 255-260 - 1994
Masahiko Nishimura, Seiki Katsuren
A population of a viperid snake,Trimeresurus flavoviridis, was studied over 10 years by removal trapping on a small subtropical island in Japan. The sex ratio of trapped individuals changed seasonally, but was not biased to either sex in the whole sample of 258 individuals. The age of each individual was estimated through the size structure and the age-size relationship. The minimum number of indi...... hiện toàn bộ
Optimal use of patches by parasitoids with a limited fecundity
Researches on Population Ecology - Tập 30 - Trang 235-249 - 1988
Yoshihiro Yamada
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