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...
Territory establishment of young bio-clawed shrew,Sorex unguiculatus (Dobson) (Insectivora, Soricidae)
Tập 30 - Trang 83-93 - 1988
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....
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...
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...
Phenological studies on the wing dimorphism of a semi-aquatic bug,Microvelia douglasi (Heteroptera: Veliidae)
Tập 31 - Trang 129-138 - 1989
Seasonal changes in the percentage of macropterous individuals in natural
population ofMicrovelia douglasi in permanent habitats were investigated in
Shimane, western part of Japan. Macropterous forms of 5th instar nymphs occurred
most frequently from late June to early July. However, the seasonal appearance
of macropterous adults differed between habitats and years. There were
significant effects...
Insect migration: Variability and success in a capricious environment
Tập 36 - Trang 165-171 - 1994
Stochastic effects of climate and weather have a pervasive influence on the
induction, performance and evolution of migration. In wing-dimorphic species,
their influence on habitat quality, and on rates of development of the migrant
itself, maintains variation in responses to environmental cues determining
wing-form and migratory behaviour. Migrants flying above their flight boundary
layer rely on...
Delayed maturation in the colonial coralGoniastrea aspera (Scleractinia): whole-colony mortality, colony growth and polyp egg production
Tập 40 - Trang 287-292 - 1998
The present study examines (1) the cost of reproduction on colony growth, and
(2) relationships among sexual maturity, whole-colony mortality rate and colony
growth rate inGoniastrea aspera free from external influences by macrobenthos.
Survival of colonies in permanent plots was followed for two years. Egg
production by polyps in colonies collected just before the first spawning of a
year was est...
The estimation of population density of the green rice leafhopper,Nephotettix cinticeps Uhler, in spring field by the capture recapture method
Tập 9 - Trang 113-129 - 1967
The population parameters of green rice leafhopper,Nephotettix cincticeps in
hibernated generation was estimated by the capture-recapture method on the
gramineous weeds of resting paddy field from late in April to mid-May,
1962–1965. The difficulty of applying the capture-recapture method to this
insect is caused from the low density and the low activity of the leafhopper, so
that it is necessary ...