摘要:

The polytene karyotype of a fewBilobella aurantiaca (Neanuridae, Collembola) Italian populations are described. The Southern populations show a smaller amount of α-heterochromatin than those of Central Italy. On the basis of recent views on heterochromatin significance, it is suggested that the Central populations might have a reduced frequency of chiasmata and be genetically more stable than the Southern populations. The differences in the band structure might reflect a cryptic speciation.

ISSN:0373-4137    

DOI:10.1080/11250007909440304

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

In five species ofOnychiurus(Collembola Onychiuridae) the diploid chromosome number is higher in animals of narrower width. In three species ofAcerentomon(Protura Acerentomidae) the number of the chromosome arms (FN), not the chromosome number, is inversely correlated to the length of the foretarsus and consequently to the narrowness of the passages they can frequent.

ISSN:0373-4137    

DOI:10.1080/11250007909440305

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Achievements and perspectives of the European Invertebrate Survey in Belgium and Europe.

ISSN:0373-4137    

DOI:10.1080/11250007909440306

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Lumbricid population densities and their relationships to certain environmental factors were studied in the Venetian pre-Alps and in coniferous woods of Cadore.

ISSN:0373-4137    

DOI:10.1080/11250007909440307

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Present knowledge of the blind soil Curculionidae (Coleoptera) has been synthesized. All the genera living in the deep soil, belonging, so far as is known, to eight different sub-families out of a total of 73 attributed to the Rhynchophora, have been surveyed. For each the number of taxa has been reported along with zoogeographical and systematic notes.

ISSN:0373-4137    

DOI:10.1080/11250007909440308

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Attention is focused on soil rotifers, gastrotrichs, nematodes and tardigrades which are active solely when enveloped by a water film and survive freezing and desiccation by virtue of their ability to enter cryptobiosis.

ISSN:0373-4137    

DOI:10.1080/11250007909440309

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

The effect of atrazine on soil microarthropod populations was studied in an experimental field cultivated with maize.

ISSN:0373-4137    

DOI:10.1080/11250007909440310

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Trophic relationships between the microfauna and the microflora of the soil: qualitative and quantitative aspects.

ISSN:0373-4137    

DOI:10.1080/11250007909440311

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

Nematodes are a quantitatively significant component of the soil microfauna: the number of individuals per m2is measured in millions. They belong to the trophic level of the consumers, but they influence the processes of degradation and mineralization of organic matter, mostly due to the trophic relations which they establish with fungi and bacteria. The species that feed on fungi are represented by nematodes which are furnished with a buccal stylet and, in particular, by Tylenchida. Their role in the decomposition process of litter is essentially that of rendering the nutrients contained in fungi accessible to other organisms such as bacteria. In some cases they disseminate the spores of fungi. The nematode species that feed on bacteria have no buccal stylet. Their role consists in maintaining the demographic equilibrium in the bacterial population and in favouring the spreading and the proliferation of certain species.

ISSN:0373-4137    

DOI:10.1080/11250007909440312

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

LES RONGEURS ET L'ÉVOLUTION. Par J. Chalin et P. Mein; pagg. XI+235, Doin Editeur, Paris, 1979. Reviewed by Ernesto Capanna.

ISSN:0373-4137    

DOI:10.1080/11250007909440313

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor