Hectopsylla pulex Haller is documented for the first time from Cochise County, Arizona on the Lesser Long-nosed bat, Leptonycteris yerbabuenae Martinez and Villa (Phyllostomidae). This represents the first record of this flea on this Chiropteran Family. The most favorable site of attachment of H. pulex appears to be the head, particularly the ears and tragus. The potential interference of echol...

Precopulatory mate guarding (PCMG) is generally assumed to be costly for both sexes. However, males may gain by displaying long-lasting mate guarding under strong male-male competition. Surprisingly, the potential for females to benefit from being held by males has been largely overlooked in previous studies. In Gammarus pulex, an amphipod crustacean, PCMG lasts several weeks, yet females are d...

Mosquitofish are widely used for biological control of mosquito larvae in rice fields, but the presence of different types of vegetation or alternative arthropod prey affects the performance of the fish. Feeding experiments were conducted in 4 rice field vegetation zones. Overall, predation was maximal in young and mature rice, moderate in the submerged naiad vegetation, and minimal in areas of...

MACKAY, N. A., CARPENTER, S. R., SORANNO, P. A., and VANNI, M. J . 1990. The impact of two Chaoborus species on a zooplankton community. Can. J. Zool. 68: 98 1-985. The responses of a zooplankton community to Chaoborus predation were studied in large in situ mesocosms in Peter Lake. Chaoborusflavicans, the native chaoborid, significantly reduced the density of the dominant grazer, Daphniapulex,...

Habitat instability has an important influence on species' occurrence and community composition. For freshwater arthropods that occur in ephemeral rock pools, the most drastic habitat instabilities are droughts and the intermittent availability of water. However, although the desiccation of a rock pool is detrimental for planktonic populations, it may also bring certain benefits: the exclusion ...

Zooplankton body size shows a strong association with temperature, competition, and predation. Global warming affects all three drivers of is thus expected to lead substantial changes in zooplankton community composition distributions. To disentangle the isolated joint effect fish predation on species biomass zooplankton, we monitored population biomasses Daphniidae that differ (Daphnia magna, ...

MALDI-TOF/TOF tandem mass spectrometry has been applied to determine the complete sequences of the PVK/CAP2b neuropeptides in abdominal dorsal sheath tissue of the housefly Musca domestica, flesh fly Neobellieria bullata, stable fly Stomoxys calcitrans and horn fly Haematobia irritans. This peptidomic analysis of single neurohemal organ preparations allows, for the first time in arthropods, the...

condition of her tongue also supported this impression. The abdomen felt very resistant but not rigid. At operation there was a large quantity of blood-stained fluid. The last two feet of the ileum were a brilliant scarlet colour, and showed numerous small black areas of haemorrhage. The gut wall was markedly thickened, owing to the blood in the tissues, and this explained the mass felt per rec...