ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT245

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The male and female ofPolycentropus cianficconiaesp. n. (Peloritani Mountains, Northeast Sicily) are described. This new species is related toP. divergensMosely, 1930, of which the variability of some characters of male genitalia is examined. Female genitalia of the new species are compared to those ofP. divergens,P. malickyiMoretti, 1981 andP. mortoniMosely, 1930. The characters of female genitalia are useful for evaluating the relatedness and differences among the species. They agree with the findings of the study on male genitalia.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT247

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Female imagines, subimagines, eggs and larvae ofElectrogena antalyensis(Kazanci & Braasch) from Turkey are described for the first time. The results of a thorough analysis of larvae, based on the standard set of diagnostic characters for the identification ofElectrogenaspecies, are reported. The peculiarity of several characters placesE. antalyensisin an isolated position within the genusElectrogena.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT261

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Neophylax kolodskiisp. n. from Great Smoky Mountains National Park is described and illustrated from adult specimens.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT271

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The effects of constant air temperature and relative humidity on the longevity of three species of gripopterygid stonefly adults from New Zealand were investigated in laboratory experiments, and the results were compared to field measurements of air temperature and humidity obtained during summer. Greatest longevity forZelandobius furcillatus,Zelandoperla decorataandAcroperla trivacuatawas recorded in cool humid conditions (10°C, 100% humidity) for adults fed water and a 5% sucrose solution. Absence of feeding reduced survival by 37–73% at 17°C and 100% humidity. Survival decreased significantly with increasing constant air temperature (10, 17 and 25°C) and decreasing mean relative humidity (100, 81 and 15%). Males survived significantly longer than females in all temperature treatments forZ. furcillatus, but longevity was not influenced by gender in other species or in the humidity experiments. Interpolated LT 50 values over 96 h for female stoneflies in the temperature treatments averaged of 22–23°C. Field measurements at near-ground level and 1.5 m above the streambank during summer indicated that these air temperatures were exceeded for 25% of the time in a pasture catchment compared to <0.1% of the time in a native forest catchment. These findings implicate air temperature as a factor potentially influencing the longevity of adult stoneflies, and suggest that maintenance of appropriate microclimate conditions should be a consideration in riparian management.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT275

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

The diets of three species of gripopterygid stonefly adults (Acroperla trivacuata,Zelandoperla decorataandZelandobius furcillatus) from New Zealand were investigated using field studies and laboratory experiments. Guts of female stoneflies were generally fuller than those of males, suggesting that terrestrial feeding was particularly important for females. AdultA. trivacuataandZ. decoratacollected from riparian vegetation had fuller guts than those collected from rocks, indicating that adults may move towards riparian vegetation to feed after emergence. Fungi and pollen formed the core food categories found in the guts of adult stoneflies collected from riparian vegetation. Stable isotope analyses of stoneflies and potential food sources collected from the near-stream riparian zone indicated that adult body carbon was derived primarily from autochthonous sources and/or from lichen growing on exposed stream channel rocks. The absence of mature females in our near-stream field collections may explain the lack of congruence between results of gut content and stable isotope analyses, as there would be a time lag between feeding following emergence and incorporation of any terrestrial carbon into body tissue. Assays for the presence of fructose were typically negative, even though pollen and sooty mould fungi were often ingested, probably because nectar or honeydew was rapidly assimilated after ingestion. Laboratory feeding trials indicated that adultZ. decoratalived significantly longer when fed a dilute sucrose solution than when fed a yeast extract solution or water. Our results demonstrate that terrestrial food sources are consumed by these adult gripopterygid stoneflies and that feeding is important for longevity. The provision of dietary requirements for the completion of adult aquatic insect life cycles may be an important consideration in riparian vegetation management. Dietary and assimilation studies of mature females which may move deep into riparian zones are required to resolve the strength of these linkages.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT285

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A total of 14 species of genusAphelocheirusWestw. from China are listed in this paper. One new species,Aphelocheirus brunneussp. n., is described from Hubei Province.Aphelocheirus carinatus(Royer, 1920) is reported from China for the first time. The type specimens are deposited in the Department of Biology, Nankai University, Tianjin (300071), China.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT297

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

A new species of perlid,Anacroneuria takutusp. n., from Guyana is described and a new record ofA. arawakStark is given. Two additional species ofAnacroneuria, represented only by female specimens, are described under informal designations.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT305

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Differences between sexes in life history patterns ofSympetrum sanguineumwere studied in a small pond in southern Sweden by means of exuviae and adult sampling. Emergence occurred from 4 to 28 July, and mean emergence date was 10 July for both males and females. The sex ratio at emergence (53% females) did not differ from 1:1, but significantly more females emerged during the first 5 days of the emergence period. Size of emerging individuals (immatures) decreased as season progressed and males emerged at a larger size than females. While immature males were heavier than immature females, no such difference was found in mature individuals. We suggest that the sexual differences in size and emergence patterns observed are the result of different optimisation by males and females with respect to the growth-mortality risk trade-off in the larval and adult stages.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT311

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

During the survey of chiromonid midges from Kyushu, the authors found a new species of Podonominae (Chironomidae),Boreochlus longicoxalsetosus. The male imago of this new species is described and illustrated. This constitutes the third record of the subfamily Podonominae, and the second species of the genus from Japan. The new species has very long notable setae lying on the dorsomedial surface distal to the volsella, which are never seen in the otherBoreochlusspecies. A key to species of the genus in the world is given.

ISSN:0165-0424    

DOI:10.1076/0165-0424(200010)22:4;1-Y;FT319

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor