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Kenichi Ozaki 《Researches on Population Ecology》1993,35(2):273-284
Summary The number of larvae reaching maturity within the gall ofAdelges japonicus was positively related to gall volume, and the relationship between the number of mature larvae and gall volume did not change
with different densities of colonized larvae.
The population changes in the bud galls ofA. japonicus were surveyed by collecting the galls, which did not suffer predation or parasitism within the galls, from young artificial
plantations ofPicea jezoensis over two years. In the year when the density of colonized larvae was high, they suffered a 42% mortality within the galls,
whereas mortality was nearly zero in the low density year. The numbers of larvae per gall were positively correlated with
gall volume. The regression lines of the number of colonized larvae on gall volume did not differ significantly in the regression
coefficients between the two years, whereas the intercept was significantly higher in the year when the density of colonized
larvae was higher. However, different within-gall mortality nullified this difference, and the regression lines of the number
of mature larvae on gall volume had no significant difference both in the regression coefficients and the intercepts. This
suggests that the number of mature larvae per gall was limited by available resources within the gall which were positively
related to gall volume. In 25% of the galls in which mature larvae inhabited, the space within the galls were completely filled
by the larvae, indicating that space was one of the limiting resources. Gall volume also affected the number of adults that
emerged from the gall and the potential number of their progeny. 相似文献
2.
2006-2007年对油松Pinus tabulaeformis、樟子松Pinus sylvestris、白扦Picea meyeri、青青扦Picea wilsonii的根、茎木质部和叶解离观察,在松属Pinus L.的两种内发现了导管分子,其数量较多,在每张制片内都可找到若干。这些细胞的端壁平坦,并有单穿孔或复穿孔板,与较粗的管胞直径、长度、纹饰基本一样。还有一些细胞介于管胞和导管的中间形态,看得出这些导管是相同类型管胞特化形成的。但在云杉属Picea Dietr的两种植物内未只有少数端壁平坦、有一个小具缘纹孔的管胞,未找到导管分子。此外,在四种植物内都有典型的木纤维和纤维化管胞。 相似文献
3.
The deme formation hypothesis in herbivorous insects states that herbivores differentiate genetically into small demes, each
specialized in the idiosyncratic traits of individual plants. We examined this hypothesis in gall-forming aphids,Adelges japonicus, by reciprocal transfers of aphids among three susceptible clones ofPicea jezoensis standing in proximity. Performance of aphids transferred to their natal clone was compared with that of aphids transferred
to other novel clones. ANCOVA showed no significant donor (source of aphids) by receptor (recipient of aphids) interactions
for both total aphid performance on the host tree over a life cycle and its three subdivisions(q
1,q
2 andq
3). In addition, the total performance on the natal clone was lowest among those in the three clones, which was explicitly
against the prediction from the local adaptation. In contrast, there were significant receptor effects onq
1 (fecundity of gallicolae multiplied by survivorship of fundatrices while feeding on needles) andq
3 (fecundity of fundatrices multiplied by survivorship of gallicolae before emergence from the galls), suggesting genetic differences
in resistance among clones. The two-fold difference inq
3 among clones was due to different gall size, which was highly correlated with the number of gallicolae that emerged from
the gall. The two-fold difference inq
1 seemed to be caused by different survivorship of larval fundatrices while feeding on needles. 相似文献
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