Entomology, Ornithology & Herpetology: Current Research
Open Access

Department of Ecology and Systematics, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan

Biography

Dr. Eisuke Hasegawa has done research on animals and mammals. Eisuke Hasegawa worked as a researcher in the Laboratory of Animal Ecology, Graduate School of Agriculture, Hokkaido University, Japan.

Publications

• Research   
  Effects of Color Morph on Aggregation Formation for Hibernation in an Extremely Color Polymorphic Ladybug, Harmonia Axyridis (Pallas) (Coleoptera: Coccinellidae)
  Author(s): Yuuka Murakami*, Eisuke Hasegawa and Saori Watanabe
  
  Understanding of mechanism for genetic polymorphisms within and among species is an important issue in ecology and evolutionary biology. A ladybug, Harmonia axyridis (PALLAS), shows extreme elytral color polymorphism, in which more than 100 types have been recognized. This polymorphism has been explained with the inheritance of 12 hypothetical alleles at a single autosomal locus. However, why such extreme polymorphism is maintained has not been clarified. Here, we show that several morphs enlarge their aggregation size during grouping before hibernation. Our results showed that the excess (or fewerness) of either one of the four color morphs from the expected values showed each a significantly positive effect on the aggregation size. A larger aggregation size resulted in better survival of all the aggregating members. These results suggest that it is bene.. View More»
  DOI: 10.35248/2161-0983.19.8.219

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