Spider communities as indicators of the development (succession) of afforested coal mining sites

On the basis of a space-for-time-substitution the succession of the spider coenosis of a Lusatian lignite mining area (pine afforestation) was investigated. Spiders were chosen because of their high abundance in both species and individuals and as representatives of a high trophic level. By comparing pine afforestations of different ages which additionally are located far away from each other we could detect a typical succession pattern in the spider coenosis. The pioneer Oedothorax apicatus (Linyphiidae) is characteristic of the initial state. Ten years after afforestation this species has disappeared and the locality shows a mixed population of spiders including species which prefer open habitats as well as species occurring in forests. After 30 years the typical species community of open, dry pine forests has established

Influence of mulching treatment on epigeic spiders in vineyards of the Kaiserstuhl area (SW-Germany)

Grünmulchen in den Rebflächen des Kaiserstuhls bewirkt, daß die Arten- und Individuenzahlen der Spinnen zunehmen. Das Artenspektrum verschiebt sich in Richtung trockenheitsliebender Arten - die Spinnenfauna wird "kaiserstuhltypischer". Die begrünten Rebflachen sind damit nicht nur Produktionsflächen, sondern auch Lebensraum für eine vielfaltige Fauna. Es gibt keine "Hackfrucht-Spinnengemeinschaft", vergleichbar der Hackfruchtflora in bodenbearbeiteten Rebflächen. Es gibt auf Rebflächen nur eine typische Spinnengemeinschaft, die je nach Intensität der Bearbeitung mehr oder weniger in Arten- und Individuenzahl reduziert ist.The spider fauna found in vineyards treated either by mulching or soil tilling was investigated and compared. Mulching treatment results in a spider community that is richer in species and in numbers. Many species found are typical for dry habitats and represent characteristic species of the Kaiserstuhl area

The disstribution of syntopic Atypus affinis and Atypus piceus (Araneae, Atypidae) in a succession area of vineyard slopes in the Kaiserstuhl (south-western Germany)

Eines der gut belegten syntopen Vorkommen der beiden in Morphologie und Lebensweise sehr ähnlichen Atypus- Arten A. affinis und A. piceus befindet sich im Kaiserstuhl (Südwestdeutschland). Dies konnte im Rahmen einer seit 1979 kontinuierlich laufenden Langzeitstudie über die Wiederbesiedlung von Weinbergsböschungen nach großflächiger Flurbereinigung gezeigt werden. Die Männchen der beiden Arten sind zu unterschiedlichen Jahreszeiten an der Oberfläche aktiv, sie sind auch in der Größe klar verschieden. Für beide Arten konnte die Besiedlungsgeschichte nachvollzogen werden: Wie für einen typischen K-Strategen zu erwarten, erfolgt der Populationsaufbau langsam und ist heute noch nicht abgeschlossen. Die Atypus-Arten werden als geeignet angesehen, beispielhaft für Fragestellungen des Naturschutzes zu dienen. Auf Grund ihres langen Entwicklungszyklus sind diese Arten durch drastische Biotopveränderungen besonders gefährdet, am Kaiserstuhl wäre dies das neuerdings wieder erlaubte Flämmen zur Böschungspflege

Der Färberwaid (Isatis tinctoria L.) - ein Beitrag zur Vegetationsökologie und Biozönologie

In the southern Upper Rhine region 3 mass proliferations of Isatis tinctoria L. were observed since 1978, the last in 2005. Long-term observations in the Kaiserstuhl revealed that such “waves” followed a drought period and collapsed after 2 - 3 years. Because dyer's woad (also called German indigo) has been an important crop plant culture-historically and today is known as a troublesome pest in North America, in 2005 it was investigated phytosociologically and with regard to its monophagous beetles, documented nearly 3 decades by trap captures. A semiquantitative detailed mapping in the Kaiserstuhl showed dominance in the most xerothermic southwestern and central part, and absence in the somewhat moister northeastern part. The qualitative analysis of stands revealed high demands on soil aeration and temperature, as well as for light intensity, thereby indicating weak competition. Moreover, it evidently shows poor dispersal ability. The coincidence with the mass increase of monophagous beetles, especially Psylliodes isatidis, explains the rapid decline of the population of Isatis. In a literature comparison Isatis tinctoria turned out to be, at least in southern Germany, a weak character species of the Convolvulo-Agropyrion repentis, the only alliance of the Agropyretea intermedio-repentis present here

"Workshop zur Taxonomie mitteleuropäischer Spinnen" in Erlangen (8. - 10.01.1993): Taxonomie und Faunistik der kleinen Euophrys-Arten und der Gattungen Neaetha und Pellenes (Salticidae)

Da innerhalb der Araneae Mitteleuropas immer noch taxonomische Probleme bestehen, haben wir begonnen, systematisch schwierige Gattungen im Teamwork zu bearbeiten

Einfluß des Grünmulchens auf die epigäischen Spinnen in Rebflächen des Kaiserstuhls

The spider fauna found in vineyards treated either by mulching soil tilling was investigated and compared. Mulching treatment results in a spider community that is richer in species and in numbers. Many species found are typical for dry habitats and represent characteristic species of the Kaiserstuhl area

Spinnenzönosen als Indikatoren von Entwicklungsschritten in einer Bergbaufolgelandschaft

On the basis of a space-for-time-substitution the succession of the spider coenosis of a Lusatian lignite mining area (pine afforestation) was investigated. Spiders were chosen because of their high abundance in both species and individuals and as representatives of a high tropic level. By comparing pine afforestations of different ages which additionally are located far away from each other we could detect a typical succession pattern in the spider coenosis. The pioneer Oedothorax apicatus (Linyphiidae) is characteristic of the initial state. Ten years after afforestation this species has disappeared and the locality shows a mixed population of spiders including species which prefer open habitats as well as species occurring in forests. After 30 years the typical species community of open, dry pine forests has established

Aufruf und Bitte zur Mitarbeit. Der "Finger" von Atypus - wer hat Beobachtungen zum Bauverhalten von Atypus affinis und Atypus piceus?

reques

Zum Vorkommen von Atypus affinis und Atypus piceus (Araneae: Atypidae) auf einer Sukzessionsfläche im flurbereinigten Rebgelände des Kaiserstuhls

The orthognath spiders Atypus affinis Eichwald, 1830 and A. piceus (Sulzer, 1776) are morphologically and biologically similar. One of the few sites where both species live syntopically is located in the Kaiserstuhl Mountains in south-west Germany. This has been shown in a continuous 22 year long-term study of the recolonisation of vineyard slopes after large-scale land consolidation. The males of both species differ in size and the annual timing of their surface activity. The recolonisation history of A. affinis and A. piceus was recorded. As typical K-strategists, their population sizes have increased slowly. Today they are still growing. Atypus species can be used as models regarding problems of nature conservation, since they are particularly endangered by large-scale and catastrophic habitat changes as a result of their long generation time. In the Kaiserstuhl such catastrophic events could include fire management, which has recently been permitted again for the preservation of the slopes