Researches on Population Ecology
1437-5613
0034-5466
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The genetics and ecology of sympatric speciation: A case study
Tập 40 - Trang 175-187 - 1998
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...
A model of the plant-to-plant movement of aphids I. Description of the model
Tập 9 - Trang 53-61 - 1967
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: The probability thatl
individuals are located on a plant at timet 1 is represented by the following
equation $$R\l...
The spatial distribution of the wheat-bulb fly,Leptohylemyia coarctata (fall.) (Diptera: Anthomyiidae)
Tập 16 - Trang 127-131 - 1974
The spatial distribution of the eggs, larvae, pupae and adults of the wheat-bulb
fly was investigated by fitting 42 sets of data comprising 1334 samples to the
Poisson and negative binomial distributions, and by using the power law (S 2 =am
b ). In general, the tests indicated that all stages were aggregated and fitted
the negative binomial model....
Territory establishment of young bio-clawed shrew,Sorex unguiculatus (Dobson) (Insectivora, Soricidae)
Tập 30 - Trang 83-93 - 1988
Dynamics of an enclosed population of pine mice,Microtus pinetorum
Tập 10 - Trang 21-30 - 1968
Enclosed populations of pine mice were studied over a 28-month period and
compared with populations in surrounding natural areas. The enclosed populations
reached densities far greater than any observed in surrounding natural areas. It
is suggested that the restriction placed on dispersal by the enclosure walls and
the addition of food in the form of trap bait could have allowed the enclosed
popul...
Evolution of mutualistic symbiosis: A differential equation model
Tập 38 - Trang 211-218 - 1996
In geological history, rapid speciation, called adaptive radiation, has occurred
repeatedly. The origins of such newly developing taxa often evolved from the
symbiosis of different species. Mutualistic symbioses are generally considered
to evolve from parasitic relationships. As well as the previous model of host
population with discrete generations, a differential equation model of host
populatio...
Some risks and causes of mortality in mountain pine beetle populations: A long-term analysis
Tập 23 - Trang 116-144 - 1981
The interpretation of the probabilities presented in this paper is that none of
the competing biological risks, acting in the presence of other risks, offers
much, if any, regulatory influence upon a mountain pine beetle population.
Consequently, if no single risk, or combination of these risks, offers much
help, then the contention that mountain pine beetle populations are
food-regulated is once ...
Movement patterns of threeAthalia sawflies in relation to the spatio-temporal distributions of their habitats
Tập 34 - Trang 1-14 - 1992
I compared the differences in the movement intensity of three species of
sympatricAthalia sawflies,A. japonica, A. rosae andA. infumata feeding on
cruciferous plants. Mark-release-recapture census was conducted to estimate
movement distance, sex ratio and age composition of adult sawflies. In addition,
the sex ratio of newlyemerged adults was examined by rearing field-collected
larvae until adult ...
The effects and limits of territoriality on population regulation in grey red-backed voles,Clethrionomys rufocanus bedfordiae
Tập 33 - Trang 367-386 - 1991
The effects of breeding territoriality on the stability of grey red-backed vole
(Clethrionomys rufocanus bedfordiae) populations were investigated on a control
grid and a grid on which the voles were fed, in an outdoor enclosure in
Hokkaido, Japan. Vole populations were monitored by live trapping from 1984 to
1986: (1) Population density was 2–7 times greater on the experimental grid to
which food...
Dynamics of buried seed population and seedling cohorts of two dominant weeds in a hill agroecosystem of the humid subtropics of India
Tập 37 - Trang 1-7 - 1995
Dynamics of the buried seeds and plant population of two dominant weeds,
viz.,Emilia sonchifolia (Linn.) DC. andRichardsonia pilosa HBK were studied in
the crop fields of Meghalaya, north-east India during radish and maize cropping
and intervening fallow periods. The total buried seed population ofR. pilosa was
always larger than that ofE. sonchifolia, but the germinable fraction was
invariably gr...