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Population Dynamics Of Mites And Collembola In Libyan Agroecosystems
Naima Shibani and Hassan Maghrab, Zoology Department, Faculty
of Science, Al-Fatah University, P.O. Box 13799,Tripoli, Libya
E-mail: Drmaghrabi@Yahoo.com
Abstract
The results indicated that in all the "total" soil fauna is an estimate of
2244414 ind. per m˛ was obtained from the analysis and microscopic examination
of 125 kg of soil samples. This study showed that “mites and Collembola” are the
most represented of soil arthropds with an estimate of 1918932 ind. per m˛,
which represent 85.5% of the “total” soil fauna in the eight different locations
surveyed. The phytophagous and predacous mites population densities are in the
range of 1296447 ind. per m˛, representing 57.8% of the soil fauna. Scaning
electron microscope (SEM) used as an aid to identify and classify the highly
aggregate mites group e.g. the species Tectocepheus velatus, Protoribates
capucinus and Scutovertex cf. Sculptus of the family Oribatidae. On the
other hand, Collembola ranked the second common group of soil fauna with an
estimate of 622285 ind. per m˛, representing 27.7% of the total soil fauna. In
general, these findings are similar to most reported studies of soil fauna
bioecology, population dynamics and biodiversity in different ecosystems. The
mites and Collembola faunal groups investigated in different agroecosystems and
habitats in Libya showed a remarkable degree of dissimilaraties caused by
agricultural management , physical and chemical properties of agricultural
soils.
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