Extreme habitats are often characterized by reduced predation pressures, thus representing refuges for the inhabiting species. The present study was designed to investigate predator avoidance of extremophile populations of Poecilia mexicana and P. sulphuraria that either live in hydrogen sulfide-rich (sulfidic) springs or cave habitats, both of which are known to have impoverished piscine preda...

Inducible anti-herbivore defenses in plants are predominantly regulated by jasmonic acid (JA). On tomato plants, most genotypes of the herbivorous generalist spider mite Tetranychus urticae induce JA defenses and perform poorly on it, whereas the Solanaceae specialist Tetranychus evansi, who suppresses JA defenses, performs well on it. We asked to which extent these spider mites and the predato...

Bdellovibrio bacteriovorus is a species of unique obligate predatory bacteria that utilize gram-negative bacteria as prey. Their life cycle alternates between a motile extracellular phase and a growth phase within the prey cell periplasm. The mechanism of prey cell invasion and the genetic networks and regulation during the life cycle have not been elucidated. The obligate predatory nature of t...

Amblyseius swirskii, native to the east and southeast Mediterranean region, is a successful biological control agent of whiteflies. In this study, we investigated intraguild predations (IGP) between each stage of A. swirskii and each stage of two Phytoseiid species that occur in China, Amblyseius orientalis and Neoseiulus californicus. When there was no whitefly egg provided as the extraguild p...

genus Podisus, have been reported as natural enemies of many insect pests in North America (McPherson 1980). In Brazil, they have been registered in plantations of Eucalyptus (Zanuncio et al. 1994b), Pinus (Teixeira and Villa 1987), soybean and cotton (Grazia and Hildebrand 1987), coffee (Gravena and Lara 1982), cashew (Silva 1965), passion fruit (Costa Lima 1940), avocado (Fischer and Patel 19...

We measured the transfer of radiocesium in a marine food chain from phytoplankton to bivalves and finally to a predatory gastropod (Babylonia formosae habei). The assimilation efficiency (AE) of radiocesium in both green mussels (Perna viridis) and the gastropods feeding on different diets was measured by a pulse-chase feeding radiotracer technique. The AEs of 137Cs in the green mussels ranged ...

—Maternal defensive behavior against predators may appear risky but is common in many species. Herein we describe maternal defensive behavior of mountain goats (Oreamnos americanus) against Golden Eagle (Aquila chrysaetos) predatory attempts. We found that Golden Eagles attacked goats in 1.9% of sightings (n = 311 sightings of active Golden Eagles over 12 years) but were never successful. Mothe...

In 1937/38 representative mollusc collections were made in Jakarta Bay (West Java, Indonesia). New data from here and the adjacent offshore Thousand Islands archipelago (Kepulauan Seribu) became available in 2005. Although collecting efforts and sampling methods differed, a comparison of the molluscan fauna of Jakarta Bay between 1937/38 and 2005 reveals a distinct deterioration. From 1937 to 2...

Predatory pricing law attempts to keep prices low by harshly sanctioning prices that are anticompetitively low. The paradox of predatory pricing law is that even an analytically perfect specification of the line between predatory and innocent price cuts would result in deviations from optimal pricing because the very recognition of a predatory pricing offense will induce some firms to forgo inn...

Two new predatory mites of the genus Agistemus Summers (Acari: Prostigmata: Stigmaeidae) namely A. neocollyerae n. sp. and arabensis are described illustrated based on adult females. Additionally, two species simplex González-Rodriguez floridanus reported as records for stigmaeid mite fauna Saudi Arabia. A regional key to is also provided.