Horizontal distribution of the spider fauna of intensively grazed pastures under the influence of diurnal activity and grass height

Horizontal distribution of the spider fauna of intensively grazed pastures under the influence of... The spider fauna of two intensively grazed pastures was studied by means of pitfall trapping and quadrat sampling. Special attention was paid to the distribution of the spiders in islets of higher grass and shortgrazed patches during day and night. An overall relationship was found between the preference for one of the two studied microhabitats and the diurnal activity: spiders active during the night show a preference for higher vegetation (e.g. Pachygnatha clercki, Oedothorax apicatus) and day active spiders prefer short vegetation (e.g. Pardosa‐species, Erigone dentipalpis). Oedothorax fuscus and O. retusus are shown to retire in the islets at night. Some abiotic and biotic characteristics of high and short vegetation were studied. Based on observations of certain abiotic and biotic parameters, explanations for the differences in spider fauna of the two microhabitats are postulated. Zusammenfassung Zur horizontalen Verbreitung der Spinnen auf intensiv beweidetem Grasland unter dem Einfluß von Tagesaktivität und Grashöhe Es wurde die Spinnenfauna von zwei intensiv beweideten Graslandflächen mit Hilfe von Bodenfallen und Quadratflächen‐Absammlung untersucht. Dabei wurde besonders auf die Spinnenverbreitung in Inseln längeren Grases im Vergleich zu abgeweideten Flächen während des Tages und in der Nacht geachtet. An allgemeinen Beziehungen wurde hinsichtlich der Bevorzugung eines der beiden unter‐suchten Mikrohabitate und der Tagesaktivität gefunden: Nachtaktive Spinnen bevorzugten längere Vegetation (z.B. Pachygnatha clercki, Oedotborax apicatus), während die tagaktiven Arten die niedrigere vorzogen (z.B. Pardosa spp., Erigone dentipalpis). Oedotborax fuscus und O. retusus zogen sich zur Nacht hin in die längere Vegetation zurück. Einige abiotische und biotische Merkmale längerer und kürzerer Vegetation wurden untersucht. Aus den Ergebnissen werden Erklärungen für die verschiedenen Verhaltensweisen der Spinnen abgeleitet. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Entomology Wiley

Horizontal distribution of the spider fauna of intensively grazed pastures under the influence of diurnal activity and grass height

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Publisher
Wiley
Copyright
1989 Blackwell Verlag GmbH
ISSN
0931-2048
eISSN
1439-0418
DOI
10.1111/j.1439-0418.1989.tb00282.x
Publisher site
See Article on Publisher Site

Abstract

The spider fauna of two intensively grazed pastures was studied by means of pitfall trapping and quadrat sampling. Special attention was paid to the distribution of the spiders in islets of higher grass and shortgrazed patches during day and night. An overall relationship was found between the preference for one of the two studied microhabitats and the diurnal activity: spiders active during the night show a preference for higher vegetation (e.g. Pachygnatha clercki, Oedothorax apicatus) and day active spiders prefer short vegetation (e.g. Pardosa‐species, Erigone dentipalpis). Oedothorax fuscus and O. retusus are shown to retire in the islets at night. Some abiotic and biotic characteristics of high and short vegetation were studied. Based on observations of certain abiotic and biotic parameters, explanations for the differences in spider fauna of the two microhabitats are postulated. Zusammenfassung Zur horizontalen Verbreitung der Spinnen auf intensiv beweidetem Grasland unter dem Einfluß von Tagesaktivität und Grashöhe Es wurde die Spinnenfauna von zwei intensiv beweideten Graslandflächen mit Hilfe von Bodenfallen und Quadratflächen‐Absammlung untersucht. Dabei wurde besonders auf die Spinnenverbreitung in Inseln längeren Grases im Vergleich zu abgeweideten Flächen während des Tages und in der Nacht geachtet. An allgemeinen Beziehungen wurde hinsichtlich der Bevorzugung eines der beiden unter‐suchten Mikrohabitate und der Tagesaktivität gefunden: Nachtaktive Spinnen bevorzugten längere Vegetation (z.B. Pachygnatha clercki, Oedotborax apicatus), während die tagaktiven Arten die niedrigere vorzogen (z.B. Pardosa spp., Erigone dentipalpis). Oedotborax fuscus und O. retusus zogen sich zur Nacht hin in die längere Vegetation zurück. Einige abiotische und biotische Merkmale längerer und kürzerer Vegetation wurden untersucht. Aus den Ergebnissen werden Erklärungen für die verschiedenen Verhaltensweisen der Spinnen abgeleitet.

Journal

Journal of Applied Entomology – Wiley

Published: Jan 12, 1989

References

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