DISTRIBUTION, ABUNDANCE AND HOST PLANT RELATIONSHIPS OF SALIX-FEEDING PSYLLIDS (HOMOPTERA, PSYLLOIDEA) IN ARCTIC ALASKA

被引:33
作者
HODKINSON, ID
JENSEN, TS
MACLEAN, SF
机构
[1] AARHUS UNIV, INST ZOOL & ZOOPHYSIOL, DK-8000 AARHUS, DENMARK
[2] UNIV ALASKA, INST ARCT BIOL, FAIRBANKS, AK 99701 USA
关键词
D O I
10.1111/j.1365-2311.1979.tb00568.x
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Abstract. 1. Five species of psyllid occurred on seven species of Salix at Meade River, Alaska. Studies were made on the two common species Psylla pclmeni Löw and P.phlebophyllae Hodkinson. The former feeds on the phanerophy tes Salix pulchra, S.lanata, S.alaxensis and S.glauca, the latter on the chamaephytes S.phlebophylla and S.reticulata. 2. Both P.palmeni and P.phlebophyllae had a 1‐year life cycle and nymphal development took place on the female Salix catkin. The life cycle was generally closely synchronized with the period of catkin development. However, only a few eggs were laid on S.glauca 3. Seasonal perturbation of the host plant by flooding, ice movement and blown sand prevented psyllids breeding in certain areas colonized by the host plant. 4. In P.palmenidensities and ‘feeding pressure’, measured as biomass of psyllids per gram of catkin, on the different host plants followed the sequence S.pulchra>S.lanata> S.alaxensis > S.glauca. In P.phlebophyllae densities and feeding intensities were similar onS.phlebophyllaandS.reticulataand grazing intensity was comparable withP.palmenion S.pulchra. 5. A highly significant negative correlation was found between psyllid density and catkin dry weight in S.pulchra, S.phlebophylla and S.reticulata, suggesting that psyllid feeding is affecting catkin growth. 6. Predation of psyllid nymphs by syrphid larvae was heavy but there was no evidence of parasitism. 7. The life history strategies of the five psyllid species are discussed within the context of the constraints imposed by the arctic environment. Copyright © 1979, Wiley Blackwell. All rights reserved
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页码:119 / 132
页数:14
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