摘要:

Abstract.1Pterostichusspecies were sampled on ninety‐two sites distributed throughout north‐east England using pitfall trapping.2The incidence of each species was related to measured site environmental variables using logistic regression.3Four species groups were identified on the basis of size. The extent of overlap in habitat types between species in each group varied. Two large species overlapped considerably whilst the smaller species showed different responses to one or more environmental variable.4Possible causes of the differences in habitat overlap betweenPterostichusspecies are discus

ISSN:0307-6946    

DOI:10.1111/j.1365-2311.1991.tb00196.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Abstract.1Spatial, temporal, and dietary differences in resource utilization and patterns of interspecific association on leaves were investigated for dominant and common leaf‐mining species on an oak species,Quercus dentataThunb., in Hokkaido, northern Japan.2Leaf miners were divided into two groups according to leaf tissues used for food: upper‐layer‐feeders which consume the palisade paren‐chymatous layer (Stigrnellaspp. and tenthredinid sp.), and full‐depth‐feeders which consume spongy and palisade parenchymatous layers (Phyllonorycter leucocorona(Kumata),P.similisKumata, andCaloptilia sapporella(Matsumura)).3Differences in the position of mines on leaves were found among species: mines ofP.similiswere distributed more frequently in the middle section of leaves, whereas those of the remaining species were concentrated in the basal section.4Leaf size preference differed between species:C.sapporellaand tenthredinid sp. tended to select larger leaves more frequently than did the other species.5Phenological differentiation was found among species:C.sapporellaappeared earliest, followed byP.similis, P.leucocoronaand a tenthredinid sp., and thenStigmellaspp.6Each species showed a highly clumped distribution among leaves. Leaf miners of some species pairs co‐occurred on leaves more frequently than expec

ISSN:0307-6946    

DOI:10.1111/j.1365-2311.1991.tb00197.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Abstract.1The time course of abundance of adult insects emerging in discrete generations is modelled, assuming the absence of net migration and a constant death rate. The time till emergence is assumed to be logistically distributed.2The qualitative features of the model depend on one dimensionless parameter only, namely the product of the death rate and a dispersion measure for the symmetric emergence distribution.3The model is fitted to data on the abundance of five butterfly species. The tit is excellent; moreover, the estimated death rates are well within the range given in the literature (mostly 0.1–0.2 day‐1). Death rates are generally obtained by mark‐recapture methods. The present model gives the opportunity to evaluate some assumptions of these me

ISSN:0307-6946    

DOI:10.1111/j.1365-2311.1991.tb00198.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0307-6946    

DOI:10.1111/j.1365-2311.1991.tb00199.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0307-6946    

DOI:10.1111/j.1365-2311.1991.tb00200.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0307-6946    

DOI:10.1111/j.1365-2311.1991.tb00201.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY