摘要:

A new colour pattern of the larva ofRhyacophila meridionalisis described and compared to the larval kinds of this species known up‐to‐now and to the other larvae belonging to subgenusRhyacophila s.s.Some ecological notes on the locality in the Iberian Peninsula where these larvae were found are included.

ISSN:0165-0424    

DOI:10.1080/01650429709361629

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Neohapalothrix acanthonympha(Brodsky, 1954) (from the Altai and the Russian Far East) andN. shirozuiSaigusa, 1973 (from Hokkaido) are placed in the synonymy ofN. manschukuensis(Mannheims, 1938) (from Manchuria). The genusNeohapalothrixKitakami seems indeed to be a close relative of the European genusHapalothrixLoew. The tribal assignment of both genera is discussed.

ISSN:0165-0424    

DOI:10.1080/01650429709361630

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Apatidelia gansuensissp. n. is described from Ganzu Prov. on the basis of two males. The genitalic apparatus is illustrated.

ISSN:0165-0424    

DOI:10.1080/01650429709361631

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A central aspect of simuliid adaption to life in moving water is a silky secretion which they produce in their salivary glands. This secretion is spread on the substrate surface thereby enabling adhesion of the posterior abdominal hooks of the larvae to the substrate surface. Therefore, silk pads are a prerequisit for simuliid filter‐feeding as well as any kind of locomotive activity. If silk pad adhesion is weak, larvae risk drifting off, either directly or during locomotion. Properties of the adhesive (=silk) as well as the substrate surface may cause weak adhesion. A specialist such asS. noelleriwhich has little chance of surviving after drifting off its lake outlet habitat, should have adaptations to reduce this risk. Such an adaptation could be very durable silk pads, giving larvae the chance to be safely attached for a relatively long time. In this study larval silk pads ofS. ornatumandS. noelleriwere stained using Giemsa's staining procedures. Changes in silk pad structure and traces of rot after 2–33 days of exposure to stream water were recorded and compared. Silk pads of S.ornatumandS. noellerishowed differences which indicate differences in ageing processes and biochemistry of this secretion.

ISSN:0165-0424    

DOI:10.1080/01650429709361632

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Nemoura ussuriensisZhiltzova sp.n., and the previously unknown males and mature nymphs ofMegarcys magnilobusZhiltzova andIsoperla ornataZhiltzova from the Russian Far East are described and illustrated. They are compared with other congeneric species.

ISSN:0165-0424    

DOI:10.1080/01650429709361633

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

BAUERNFEIND, E.: Bestimmungsschlüssel für die Österreichischen Eintagsfliegen (Insecta: Ephemeroptera).—Wasser und Abwasser, Suppl. 4/94; 1. Teil, 92 pp. (1994; ISBN 3–900672–93–8); 2. Teil, 96 pp. (1995; ISBN 3–900672–94–6).

ISSN:0165-0424    

DOI:10.1080/01650429709361635

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The morphology and chaetotaxy of the three larval instars of the genusLimnebiusare described and illustrated following the setal patternof Limnebius cordobanusd'Orchymont, whose morphology is sufficiently representative of the genus. This is the first complete study of larval chaetotaxy for a genus of Hydraenidae.

ISSN:0165-0424    

DOI:10.1080/01650429709361634

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Changes in the quantities of seston (phytoplankton and zooplankton), and epilithic algae, and densities ofAoteapsyche raruraru(McFarlane) larvae were investigated over a six month period at three sites 15 m, 25 m, and 250 m below the outlet of Lake Kaniere, Westland, New Zealand. Phytoplankton abundance varied little between sites, however zoo‐plankton densities were highest 25 m below the outlet where the highest hydropsychid densities were also found. In contrast, epilithic algal biomass was greatest 250 m below the outlet where the fewest hydropsychids were collected. Higher densities and larger larvae were found on the upper surfaces of stones in faster water (> 0.6 m s‐1). Net morphology also changed as current velocity increased: at slower currents (< 0.2 m s‐1) 70–80% of larvae had “sail”; nets with a single jib support, whereas at >0.65 m s‐1more than 80% of larvae had nets with two “goal post”; supports. Gut analysis indicated that larvae in slower currents had ingested a higher proportion of filamentous algae and diatoms, whereas larvae in faster currents had higher proportions of zooplankton in their diets. Results of this study indicate that net design is influenced by current velocity which influences diet and possibly growth in the outlet of Lake Kaniere.

ISSN:0165-0424    

DOI:10.1080/01650429709361636

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

ISSN:0165-0424    

DOI:10.1080/01650429709361628

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor