Title of article :
Effects of oxidant air pollutants on western pine beetle (Coleoptera: Scolytidae) populations in southern California Original Research Article
Author/Authors :
Donald L. Dahlsten، نويسنده , , David L. Rowney، نويسنده , , Ronald N. Kickert، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1997
Pages :
9
From page :
415
To page :
423
Abstract :
The attack rates, brood survival, and emergence rates of the western pine beetle, Dendroctonus brevicomis LeConte, and incidence of entomophagus associates, were compared between photochemical oxidant damaged, and apparently healthy, ponderosa pine trees, Pinus ponderosa Dougl. ex Laws in the San Bernardino Forest in Southern California. The results from this study suggest that oxidant-damaged trees attacked by western pine beetle produced about the same total brood with lower initial attacks when compared with healthier trees, whereas the numbers of predators and parasitoids were higher in the healthier trees. This higher productivity trend for western pine beetle is most evident in trees attacked by the first beetle generation. Trees attacked by the second generation, both damaged and healthy, produced much less western pine beetle brood than generation 1 attacked trees, regardless of oxidant damage. The implication of these results is that, in stands with a higher proportion of oxidant damaged trees, a given population of western pine beetle could kill more trees, and increase at a greater rate, than in a stand with a lower proportion of damaged trees.
Keywords :
Forest ecosystem , Air pollution , Population dynamics , tree mortality. , bark beetle
Journal title :
ENVIRONMENTAL POLLUTION
Serial Year :
1997
Journal title :
ENVIRONMENTAL POLLUTION
Record number :
729175
Link To Document :
بازگشت