English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Emergenzschwankungen - ein produktionsbiologisches Problem. - Schlitzer produktionsbiologische Studien Nr. 7 -

Illies, J. (1974). Emergenzschwankungen - ein produktionsbiologisches Problem. - Schlitzer produktionsbiologische Studien Nr. 7 -. Verhandlungen der Gesellschaft für Ökologie, 3, 131-142.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Illies, Joachim1, Author           
Affiliations:
1Limnological River Station Schlitz, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976546              

Content

show
hide
Free keywords: -
 Abstract: Abstract Comparative study of the Plecoptera emerging from Breitenbach (near Schlitz/Hessen) during 5 years revealed significant differences in annual yield without noticeable changes in species composition. In a given year, most species together had high or low abundances, so that percentage-composition was only insignificantly altered. Species of Protonemura form an exception to this rule, as they apparently are sensitive to variations in external factors. Some species also show contrary trends (Amphinemura, Nemurella), possibly because of autecological particularities or because they fly at quite different times of the year than does the rest of the species (L. digitata in autumn, L. prima in late winter). There is a correlation to precipitation, low discharge during the quarter of a year subsequent to a species' flight period (while this species will be at the egg stage) will result in lower numbers emerging next year. In fact, abundance of L.prima and L.digitata depends on precipitation during the first quarter of a year, rather than during the 3rd, as is usually the case, thus providing evidence for the above-mentioned correlation. Annual production in highland streams appears to be largely dependent on discharge during the preceding late summer-autumn period. If this theory holds true, the amount of insects emerging could be predicted. Future investigations in our test streams will have to check on this.

Details

show
hide
Language(s): deu - German
 Dates: 1974
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 286344
Other: 0373
 Degree: -

Event

show
hide
Title: Jahrestagung der Gesellschaft für Ökologie
Place of Event: Saarbrücken
Start-/End Date: 1973 - 1973

Legal Case

show

Project information

show

Source 1

show
hide
Title: Verhandlungen der Gesellschaft für Ökologie
  Alternative Title : Verh. Ges. Ökol.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 3 Sequence Number: - Start / End Page: 131 - 142 Identifier: -