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1

Species richness and abundance of insects during post-fire succession of a Pinus brutia forest in Mediterranean region

100%
Kaynas B. Y., Gurkan B.
Polish Journal of Ecology
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2008
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tom 56
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nr 1
In the Marmaris National Park (located on the Mediterranean coast of SW Turkey) mostly covered with Pinus brutia forests, four sites were selected to study the postfire successional trends in vegetation and insect communities. The sites represented: 1, 5, and 21 years after fire as well as control site (more than 45 years after fire). On the study plots (0.5 ha) the insects were collected with the sweep net swung along three transects each of 100 m length, in monthly intervals between August 2000 and September 2001. The number of plant species decreased from 41 to 32 along succession, as well as the number of stage-specific species but the mean height of vegetation increased with successional stage. The abundance and species richness of herbivorous insects decreased along succession as well as two main herbivore groups – xylophagous and sap-feeders. However, no major changes were found between the sites in terms of abundance or species richness of predators. This decrease in herbivorous forms may be a result of changes in the plant architecture and vegetation structure between post-fire successional stages.
2

Effect of the pest Marchalina hellenica Gennadius [Homoptera, Margarodidae] on the growth parameters of Pinus brutia Ten. in Mugla Region [Turkey]

80%
Yesil A., Gurkan B., Saracoglu O., Zengin H.
Polish Journal of Ecology
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2005
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tom 53
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nr 3
Marchalina hellenica Gennadius is a common pest prevalent in Pinus brutia Ten. forests in Muğla province of Mediterranean Region of Turkey (28˚20’03”E; 37˚12’18”N). The pest is known to suck sap from a number of pine tree species, especially Pinus brutia. The goal of this research is to determine whether the pest has a negative impact on the volume increments of Pinus brutia trees and forests. Two areas with identical site conditions are selected for study: one non-infested and one infested with Marchalina hellenica. The effects of site quality and age on the sampled trees have been eliminated. The diameter growth at breast height, basal area (the cross-sectional area of a tree at breast height) and the increment of tree volume are determined separately for both study areas. A t-test applied to volume increments of both infested and noninfested trees of all ages proves that infestation causes significant negative impacts on trees between the ages of 40 and 80 years. The greatest loss of increment in single trees is 2.0% (of the volume of non-infested tree) which occurs at the age of 70 years old. When considering the entire stand, the greatest loss of increment is 3.4% (of the volume of non-infested stand) which occurs at the age of approximately 45 years.
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