Marsh wolf spider
Pardosa palustris
The marsh wolf spider is a small to medium-sized spider from the Lycosidae family. It primarily inhabits open, damp to moderately dry locations such as meadows, bogs, and heaths. The species does not build webs, but instead hunts its prey actively on the ground. A characteristic feature is the light median stripe on the darker prosoma and the often lightly ringed legs.
Details
Identification
Light median stripe on the carapace, three light longitudinal stripes on the abdomen, females carry bluish-grey egg sacs attached to the spinnerets.
Social behavior
Solitary; exhibits cannibalistic behavior in cases of high density or food shortage.
Diet
Feeds predatorily on small invertebrates such as flies, gnats, springtails, and aphids.
Hunting strategy
Active visual hunter that pursues prey by running fast and overwhelming it with a jump.
Overwintering
Overwinters as a subadult individual in leaf litter or moss cushions.
Ecology
Ecological role
Important predator in the herbaceous layer, contributing to the regulation of insect populations.
Natural predators
Birds, small mammals like shrews, amphibians, and spider wasps.
Competitor species
Other wolf spider species of the genera Pardosa, Lycosa, or Pirata.
Ecosystem service
Biological pest control by consuming phytophagous insects.
Threats
Intensification of agriculture, drainage of wetlands, and use of broad-spectrum insecticides.
Scientific profile
Profile
Distinguishing features
Characteristic of Pardosa palustris is the light median band on the carapace, which is strongly narrowed in the anterior region (eye area). Reliable differentiation from related species of the Pardosa monticola group is often only possible through microscopic examination of the epigyne (females) or the palpal bulb (males).
Habitat
Inhabits open habitats such as extensively managed meadows, pastures, bogs, heaths, and alpine grasslands up to over 2500 m a.s.l. Despite the name 'palustris' (marshy), it is also common in drier open landscapes.
Role in food web
Important predator in the soil fauna for regulating insect populations; serves as prey for birds, amphibians, and predatory insects.
Protection & threats
Main threats
Agricultural intensification (fertilization, frequent mowing), habitat loss due to succession (scrub encroachment), and sealing of open land areas.
Population trend
Stable; the species is considered widespread and common in Germany and large parts of Europe (Red List Germany: Least Concern).