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Citation:

N iche of Three Dom inant Shoot boring Noctuids andTheir Interspecific Competition

  • Received Date: 2009-02-11
  • Shoot boring noctu ids are the most importan t pests in bamboo shoot periods. In th is paper, insectpopulat ion b iology theory w as used to ana lyze quantitatively the niches of three dom inant shoo t boring noctu ids.These noctuids w ere investigated on three bamboo spec ies, Phy llostachy s praecox, P. iridescins and P. glauca,respectively. Itw as found that the popu lation density ofK umasia kumaso and Apamea ap am eoides w ere the ma inspec ies. The former reached the peak from late A pr il to early M ay, exper ienc ing seven days or so, and the latteraggregated on m id M ay, lasting about ten days. These tw o spec ies occurred separately. Oligia vulgaris w erecaptured few er in the field and observed to be less infested than the prev iousmentioned tw o species. Analysis fromeco log ica l ind ices show ed that temporal n ich breadth ofK. kumaso w as the narrow est among three noctu ids. Thetempora l n iche sim ilarity be tw een Oligia vulgaris and Apamea kumaso w as h igher than 0. 7 w hile the interspec ificcompetition coefficient w as 0. 907 3. The results ind icated tha t the competition betw een O. vulgaris andK. kumasoeventua lly resoulted in the sign if icantly h igher populat ion density ofK. kumaso than O. vulgaris. The temporaln iche breath ra lues ofK. kumaso and A. apam eoides w as very sim ilar. It had never observed that three spec iescoex isted on the same shoots. The coex istence rat ios of tw o o f them w as only 0. 97%.
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N iche of Three Dom inant Shoot boring Noctuids andTheir Interspecific Competition

  • 1. Research inst itute of Sub trop icalForestry, CAF, Fuyang 311400, Zhej iang, Ch ina
  • 2. Forestry Bureau ofAn ji Coun ty, Zhejiang Prov ince, An ji 313300, Zhe jiang, Ch in a

Abstract: Shoot boring noctu ids are the most importan t pests in bamboo shoot periods. In th is paper, insectpopulat ion b iology theory w as used to ana lyze quantitatively the niches of three dom inant shoo t boring noctu ids.These noctuids w ere investigated on three bamboo spec ies, Phy llostachy s praecox, P. iridescins and P. glauca,respectively. Itw as found that the popu lation density ofK umasia kumaso and Apamea ap am eoides w ere the ma inspec ies. The former reached the peak from late A pr il to early M ay, exper ienc ing seven days or so, and the latteraggregated on m id M ay, lasting about ten days. These tw o spec ies occurred separately. Oligia vulgaris w erecaptured few er in the field and observed to be less infested than the prev iousmentioned tw o species. Analysis fromeco log ica l ind ices show ed that temporal n ich breadth ofK. kumaso w as the narrow est among three noctu ids. Thetempora l n iche sim ilarity be tw een Oligia vulgaris and Apamea kumaso w as h igher than 0. 7 w hile the interspec ificcompetition coefficient w as 0. 907 3. The results ind icated tha t the competition betw een O. vulgaris andK. kumasoeventua lly resoulted in the sign if icantly h igher populat ion density ofK. kumaso than O. vulgaris. The temporaln iche breath ra lues ofK. kumaso and A. apam eoides w as very sim ilar. It had never observed that three spec iescoex isted on the same shoots. The coex istence rat ios of tw o o f them w as only 0. 97%.

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