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...
Stopping rule of host search by the parasitoid,Chrysocharis pentheus (Hymenoptera: Eulophidae), in host patches
Tập 30 - Trang 123-133 - 1988
We studied the stopping rule obeyed by the female parasitoid,Chrysocharis
pentheus, in deciding when to leave the leaflet on which she is searching for
larvae ofPhytomyza ranunculi. She seemed not to employ some stopping rules that
have been suggested; i.e., a fixed-number rule and a fixed-time rule and others.
The stopping model formulated forDapsilarthra rufiventris parasitic on the same
host sp...
A further note on the estimation of a fitness function from two samples taken from a popolation
Tập 19 - Trang 1-9 - 1977
A modification is proposed for the moments method for estimating a fitness
function that was discussed in an earlier paper (Manly, 1976b). This
modification ensures that fitness estimates are always positive. The theory has
been worked out for a fitness function of any number of variables and a computer
program has been written to carry out the iterative calculations needed for
estimation.
Population dynamics ofLuehdorfia japonica Leech (Lepidoptera: Papilionidae)
Tập 32 - Trang 173-188 - 1990
Mortality processes from egg to final instar larval stage are examined in the
papilionid butterflyLuehdorfia japonica for two generations in a natural
populations. Special attention is given to the effects of initial egg cluster
size on the survival rate by the 3rd instar. Mean egg cluster sizes for the two
generations were 11.3 and 10.7. The hatching rate was not affected by the egg
cluster size....
Factors governing dynamical behaviour of insect populations: A theoretical inquiry
Tập 25 - Trang 27-45 - 1983
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...
The spatial distribution pattern of the brown planthopperNilaparvata lugens Stål (Homoptera: Delphacidae) in west Java, Indonesia
Tập 32 Số 1 - Trang 67-83 - 1990
Spatial distribution pattern of the brown planthopper (BPH) was analyzed at 9
experimental fields in the northern part of West Java during two consecutive
rice cropping seasons, i.e., wet and dry seasons. The population of each
developmental stage and wing form of BPH at each location showed consistent
departure from the random (Poisson) distribution, the variances of the densities
in most cases e...
Extinction risk assessment of declining wild populations: The case of the southern Bluefin Tuna
- 1998
We estimate the extinction probability of a large and decreasing population, the
southern bluefin tuna. This tuna was listed as critically endangered by the
World Conservation Union (IUCN) in 1996. However, the absolute population size
is still large and the extinction probability within the next half century is
negligible if the recent population decline rate does not increase in the
future. IUCN...