Researches on Population Ecology
1437-5613
0034-5466
Cơ quản chủ quản: N/A
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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...
Local distribution of two species ofApodemus in Kyushu
Tập 24 - Trang 110-122 - 1982
Local distributions of two species ofApodemus, A. argenteus andA. speciosus,
were studied by the correct estimation of peak density of mice and the detailed
description of the habitat. Multiple regression analysis is applied to these
distributional data setting with four variables as altitude, forest type,
relative cover of shrub layer and age of forest. The local densities of both
species and the...
A simple method to estimate insect mortality from field census data: A modification of the Kiritani-Nakasuji-Manly method
Tập 40 - Trang 335-340 - 1998
Various methods have been proposed to estimate demographic parameters such as
mortality from field census data. Simple methods proposed earlier are applicable
only for limited situations. For example, the Kiritani-Nakasuji-Manly method is
applicable only if individuals are observable until their death. Improved
methods proposed later are not subject to such limitations, but are not so
widely used ...
Temporal/spatial structure and the dynamical property of laboratory host-parasitoid systems
Tập 38 - Trang 133-140 - 1996
The effects of spatial structure in terms of local capacity, or the maximum
number of larvae surviving competition at resource patches, and temporal
structure in terms of the period vulnerable to parasitoid attack in host
populations on the persistence of host-parasitoid systems were quantitatively
evaluated by laboratory experiments and well-parameterized model analyses. One
of two bruchid beetle...
Contagious egg-distribution on host pods and avoidance of pods received eggs in a wild bruchidKytorhinus sharpianus
Tập 32 - Trang 407-417 - 1990
The present study investigated the way a wild bruchid,Kytorhinus sharpianus,
distributes its eggs on host pods. First, we counted the number of eggs per pod
on the host plant (Sophola flavescens) in the field. The egg-distributions by
the overwintered-generation adults in July and by the second-generation adults
in mid October did not deviate from Poisson distribution because of small
numbers of e...
Vertical foodweb structure of freshwater zooplankton assemblages estimated by stable nitrogen isotopes
Tập 38 - Trang 283-287 - 1996
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...