mean crowding

mean crowding

A term used in parasitology for the intensity of parasite infestation relative to each other. It is only of use for density-dependent studies.
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Mean crowding values revealed differences in small-scale distribution of scallops that were undetectable with density estimates.
Distributions of juvenile and adult scallops were plotted across Georges Bank and tile Mid-Atlantic Bight, and mean density and mean crowding were calculated for juveniles and adults in both areas and years.
Crowding is the number of organisms found within a given proximity of an individual of interest, and mean crowding is the average of crowding values for all individuals in the study area.
Quadrat samples have been used to examine mean crowding values in scallop populations (MacDonald & Bajdik 1992).
With quadrat samples, however, the spatial distribution of individuals is unknown, and calculating mean crowding with an estimation of error is necessary.
In a previous study carried out in Florencio Varela city (34[degrees] 46' 30" S, 58[degrees] 16' 04" W), Buenos Aires province, Argentina, Macia (2006) estimated a crowding of about 90 larvae per liter in automobile tires and 300 larvae per liter in ovitraps using Lloyd's (1967) index of mean crowding.
Local mean crowding index" is the number of neighbors an average recovered fruit segment had within a sampling area (1250 [cm.
Wide-scale mean crowding index" is the number of neighbors an average fruit segment has within a sampling area (1250 [cm.
The wide-scale mean crowding index is based on the approximation that the fruit segments that were dispersed out of the census area occur at low densities.
The correction for the mean crowding index involved calculating the average mean crowding index at each distance for each plant and attributing this value to the estimated number of fruits that were present at that distance but not recovered.
Although its total effect on mean crowding was negative (Table 6B and 7A), when the other traits were held constant it was shown that more densely placed branches actually impeded dispersal and resulted in more dense seed distributions.
Size can mean crowding, but we never really experienced that.
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