An Ecological Study of Mixed Species Population of <i>Shirahoshizo</i> spp. on Bait Logs of Pine Tree (I)

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  • シラホシゾウ属(<i>Shirahoshizo</i> spp.) 3種の餌木をめぐる比較生態学的研究 (I)
  • シラホシゾウ属(Shirahoshizo spp.)3種の餌木をめぐる比較生態学的研究-1-
  • シラホシゾウゾク Shirahoshizo spp. 3シュ ノ エサ ボク オ メグル ヒカク セイタイガクテキ ケンキュウ 1

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Abstract

The three species of Shirahoshizo spp., S. rufescens ROELOFS, S. insidiosus ROELOFS and S. pini MORIMOTO, co-exist in a same geographical region and spend their immature stages under the bark of the same part of the pine tree. As one of the researches on the analysis of the mechanism of the co-existing, the changes of the captured and recaptured number of adults on the bait logs and the distribution patterns were investigated by marking and recapture method. The results were:<br> 1) S. insidiosus tended to be captured on the bait logs which were located on the particular side of the plot, but the other species did not.<br> 2) The changes of I_??_-values of captured individuals of S. rufescens and S. pini during the census were coincident with the changes of the captured number, but only S. insidiosus had not such tendency.<br> 3) Both S. rufescens and S. pini had the same tendency in the changes of I_??_-values throughout the census.<br> 4) The ratio of the recaptured individuals to the released individuals of S. rufescens was higher than that of S. insidiosus.<br> 5) The distribution patterns of recaptured individuals were different among the three species; the distribution pattern of S. rufescens was strongly affected by the distribution pattern of the captured individuals of the previous day, and the distribution pattern of S. pini was contagious and the degree of the contagiousness was higher than that of the captured individuals and the distribution pattern of S. insidiosus was random.

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