Day length constrains the time budget of aphid predators
نویسندگان
چکیده
منابع مشابه
Edge covering with budget constrains
We study two related problems: the Maximum weightm′-edge cover (MWEC ) problem and the Fixed cost minimum edge cover (FCEC ) problem. In the MWEC problem, we are given an undirected simple graph G = (V,E) with integral vertex weights. The goal is to select a set U ⊆ V of maximum weight so that the number of edges with at least one endpoint in U is at most m′. Goldschmidt and Hochbaum [7] show t...
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animals that can estimate their desirable habitat quality are better able to accordingly adapt their life behaviors. the life cycles of parasitoids are so closely adapted as to match their hosts life behavior. among the various host-parasitoid interactions, a peculiarity is the seasonal synchrony between host and parasitoid activity. the foraging and oviposition behaviors of lysiphlebus fabarum...
متن کاملEdge covering problems with budget constrains
In the Maximum cost m′-subgraph problem we are given an undirected simple graph G(V,E) with weights w(v) on the vertices. The goal is to select a set U ⊆ V so that the number of edges with at least one endpoint in U is at most m′ with maximum weight W ∗. In [11] a ratio 3 approximation is given for problem. We improve this result by giving a 2 + approximation for the problem, for every constant...
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هدف اصلی این تحقیق بررسی تاثیر برنامه ریزی زمانی، هم چنین افزایش میزان پیچیدگی تکالیف در نظر گرفته شده بصورت همزمان، بر دقت و صحت و پیچیدگی عملکرد نوشتاری زبان آموزان می باشد. بدین منظور، 50 نفر از دانش آموزان دختر در رده ی سنی 16 الی 18 سال به عنوان شرکت کنندگان در این زمینه ی تحقیق در نظر گرفته شدند و به دو گروه آزمایشی و کنترل بصورت اتفاقی تقسیم شدند. اعضای گروه آزمایشی هر دو تکلیف ساده و پی...
Predators of the rosy apple aphid, Dysaphis plantaginea (Pass.), in Asturian (NW Spain) apple orchards
Alternative strategies to the common practice of spraying with insecticide in order to control the rosy apple aphid Dysaphis plantaginea (Pass.) (Homoptera: Aphididae) are required. Biological control by natural enemies is a possible tool. In Asturies, despite the tradition of growing local cider apple trees, there are no studies about the community of D. plantaginea predators and their impact ...
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ژورنال
عنوان ژورنال: Insect Science
سال: 2017
ISSN: 1672-9609
DOI: 10.1111/1744-7917.12507