The distribution, spatial clustering, and density of trapdoor spiders in two California coastal dune ecosystems

Posted by
  The distribution, spatial clustering, and density of trapdoor spiders in two California coastal dune ecosystems Abstract Coastal dune ecosystems support endemic trapdoor spiders, yet population data for these species are limited. We conducted the first coastal dune trapdoor spider population estimation surveys at Moss Landing State Beach (California) and for Aptostichus stephencolberti Bond 2008 at Sunset State Beach using randomly selected 1m 2 quadrats across ~26,000 m 2 per site. Burrow densities were similar between sites (Sunset: 0.287 burrows/m 2 ; Moss: 0.453 burrows/m 2 ), yielding estimated population sizes of ~35,206 and ~30,959 individuals, respectively. However, spatial analyses revealed contrasting patterns of burrow distribution. At Sunset State Beach, burrow presence was strongly associated with vegetation and occurred closer to plants, despite vegetation being randomly distributed. In contrast, no vegetation–burrow association was detected at Moss Landing, alth...

The Uncertainties of the Scorpionic Fauna of Madagascar (LES INCERTITUDES DE LA FAUNE SCORPIONIQUE DE MADAGASCAR)

Posted by

 


The Uncertainties of the Scorpionic Fauna of Madagascar (LES INCERTITUDES DE LA FAUNE SCORPIONIQUE DE MADAGASCAR)

Abstract

For about thirty years, the systematic of scorpions on the island of Madagascar has undergone
modifications at the discretion of the authors. We will attempt to approach this through the relevant
literature.

Reminder: Gérard Dupré has authorized Jan Ove Rein, M.Sc. in Zoology and curator of The Scorpion Files, to preserve and maintain an official archive of the journal Arachnides. The archive can be accessed at: https://www.ntnu.no/ub/scorpion-files/arachnides.php.