Rhinolophus euryale and R. mehelyi are morphologically very similar species and their distributions overlap extensively in the Mediterranean basin. We modelled their foraging behaviour using echolocation calls and wing morphology and, assuming niche segregation occurs between the two species, we explored how it is shaped by these factors. Resting frequency of echolocation calls was recorded and...

A new subspecies of Ovalona setulosa (Megard, 1967) (Cladocera: Anomopoda: Chydoridae) is described based on material from Laguna Navío Quebrado (La Guajira Department), Colombia. Ovalona setulosa arangureni ssp. nov. differs from the nominative subspecies in: (1) major head pores position on head shield; (2) posterior margin of labral keel without clusters of short setules; (3) more elongated ...

The Poecilimon bosphoricus species group, representing the most diverse lineage of the bushcricket genus Poecilimon, has been studied in the Basin of Marmara Sea. Two new species, P. warchalowskae sp. n. and P. canakkale sp. n., are described morphologically and acoustically in comparison to their related taxa of the P. bosphoricus species group. Song type and morphology of the new species sugg...

[1] Mechanistic theories of fluvial erosion are essential for quantifying large-scale orogenic denudation. We examine the topographic implications of two leading classes of river erosion model, detachment-limited and transport-limited, in order to identify diagnostic and testable differences between them. Several formulations predict distinctly different longitudinal profile shapes, which are s...

Few studies have assessed how ploidy type within a species affects genetic variation among populations in relation to source climates. Basin wildrye (Leymus cinereus (Scribn. & Merr.) A. Love) is a large bunchgrass common in the intermountain Western U.S. found in both octoploid and tetraploid types. In common gardens at two sites over two years differences in both ploidy type and genetic varia...

The endemic cichlids of the Cuatro Cienegas Basin, Coahuila, Mexico are currently grouped in a single polymorphic species,Cichlasoma minckleyi.Twomorphs ofC.minckleyiwere distinguished largely by features of the trophic apparatus, especially the pharyngeal dentition. Variation in body shape, based upon analysis of a set of linear measures, was continuous and did not allow recognition of discret...

Gravity data of Ceres returned by the National Aeronautics and Space Administration’s Dawn spacecraft is consistent with a lower density crust of variable thickness overlying a higher density mantle. Crustal thickness variations can affect the long-term, postimpact modification of impact craters on Ceres. Here we show that the unusual morphology of the 280 km diameter crater Kerwan may result f...

Alluvial fans and sinuous ridges are both important records of the history fluvial activity on Mars, they often occur together. We present observations alluvial fans, many which exhibit inverted relief, in five craters region north Hellas basin. The observed ranged size from ~10 to 820 km2. identified three primary fan surface morphology classes (chute, degraded, Inverted) as well instances whe...