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

Kaynas B., Gurkan B.

Polish Journal of Ecology

2008

Vol. 56, nr 1

165-172

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 id 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.

Effect of temperature on larval survival rate and duration of development of Lymantria monacha (L.) on needles of Pinus silvestris (L.) and of dispar (L.) on leaves of Quercus robur (L.)

Karolewski P.

Polish Journal of Ecology

2007

Vol. 55, nr 3

595-600

This study assessed the effects of temperature on survival rate and duration of development (DD), i.e., time needed by larvae to reach the pupal stage, in nun moth (Lymantria monacha L.) and gypsy moth (L. dispar L.). The larvae were raised at 15, 20 or 25 [degrees] C, and fed with current-year-needles of Scots pine (Pinus sylvestris L.) and leaves of English oak (Quercus robur L.), respectively. With increasing temperature 15, 20 and 25 [degrees] C, larval survival rate (LSR) declined in L. monacha (for 35th day LSR was 0.44, 0.31 and 0.21, respectively), but increased in L. dispar (0.50, 1.00 and 0.94). In contrast, the duration of development decreased with increasing temperature in larvae of both moth species (67, 52 and 39 days for L. monacha, and 66, 43 and 33 days for L. dispar, respectively). The differences in larval survival rate between those species at higher temperatures can affect significantly their growth and development in warmer years. Therefore, it is possible that under global climate change these differences may lead to changes in distribution of both insect species.