Showing papers by "Saint Anselm College published in 1992"

Spider cocoons and their suspension systems as barriers to generalist and specialist predators

Abstract: This study tests hypotheses regarding spider cocoons and their suspension systems as barriers to generalist and specialist predators. Evidence presented here suggests that the suspension systems ofMecynogea lemniscata andArgiope aurantia cocoons are effective barriers against small generalists such as ants, but fail to stop large generalists such as birds. Cocoon covers were found to be generally ineffective against generalist predators. Various component layers of these cocoons are shown, however, to be an effective barrier against the attack modes of specific predator guilds. Cocoon covers function primarily as barriers to specialists that use active “burrowing” larvae to gain entrance into the cocoon, while the flocculent silk layer is shown to be an effective barrier against specialists which use a long ovipositor to attack cocoons. These findings support suggestions that the primary role of the cocoon is to provide protection from predators and parasites. These results also support a close evolutionary relationship between cocoon architecture and specialized predators.

The role of spider cocoons in controlling desiccation

Abstract: The abilities of the cocoons of the spiders Mecynogea lemniscata and Argiope aurantia to protect the enclosed egg and spiderling stages from desiccation were investigated in the laboratory under controlled humidities, and in the field under ambient conditions. For M. lemniscata, which has a relatively small clutch (8-30 eggs) and remains in the cocoon for approximately 9-10 months, removal of the cocoon had no effect on water loss from the egg stage, nor did it adversely affect hatching or molting success. Cocoon removal did, however, significantly affect water loss and, consequently, survival in the spiderling stage at all humidities in the laboratory and in the field. The importance of the cocoon for survival is probably related to the unusually long time M. lemniscata spiderlings spend in the cocoon overwintering. For A. aurantia, which has a substantially larger clutch size (300-1400 eggs) and remains in the cocoon for a shorter 6-7 months, cocoon removal had no effect on water loss, egg hatching success, molting success, nor spiderling survival. The lack of an effect suggests that other factors (e.g., relative humidity at the oviposition site, or a large clutch size) may be more important in controlling water loss for A. aurantia.

Naloxone reduces social locomotor activity in rats.

Abstract: Naloxone, a nonspecific opioid antagonist, has been found to decrease the activity and social behavior of rats tested in pairs but the effects on individual locomotor activity have been equivocal. In the present study, groups of male Long-Evans hooded rats received naloxone (1 or 4 mg/kg, IP) or vehicle alone (isotonic saline) 30 min prior to testing sessions. Individual locomotor activity was measured in two activity boxes (41-cm3) equipped with two infrared photobeams using daily 30-min testing sessions for 5 consecutive days. Following a 1-week washout period (no testing), activity and social attraction (paired distance and contact) were examined in pairs of rats from each group using daily 15-min testing sessions for 4 consecutive days. Locomotor activity and its habituation were not significantly affected by naloxone in rats tested individually. However, both doses of naloxone significantly reduced paired locomotor activity compared to the control group. Measures of social attraction were not significantly affected by naloxone. The present findings suggest that naloxone does not produce nonspecific depressant effects on activity but rather may antagonize opioid release in situational contexts of high arousal (e.g., social activity) with consequent reduction of activity.

The neglected elder: a family systems approach.

Abstract: Abuse and neglect of older adults is largely an invisible problem. Those who are vulnerable are often hidden from the public eye. Troubled families characteristically maintain an isolated existence and, therefore, the mistreatment of elders can occur without the knowledge of neighbors or interested community members. Factors that operate to keep the problem hidden include society's emphasis on family privacy, the victim's unwillingness or inability to report the problem, stereotypes about the aged, and denial (Quinn, 1986). Although the problem of abuse and neglect of elders is not as prevalent as child maltreatment, it is a significant societal problem in need of increased public awareness. This article will focus on the treatment of elder neglect within the context of the family.

Between the Cloister and the World: The Franciscan Third Order of Colonial Querétaro

Abstract: “The womb of the Province” is how one eighteenth-century resident described Queretaro, for within that city the Franciscans of the Province of San Pedro y San Pablo de Michoacan supported not only the friary of Santiago el Grande with its Spanish and Indian parishes, but also the pioneering College of Santa Cruz, the convents of Santa Clara and Santa Rosa de Viterbo for women, the seminary of the Province, the mission church of San Sebastian, and the friary and shrine of Nuestra Senora de Pueblito. The city additionally served as the seat of the Provincial chapter. Friars and nuns at these various foundations directed over twenty associations of laity organized into confraternities, or cofradios . Poised delicately between those who were professed Franciscans (male and female, of the First and Second Orders, respectively), and the lay confraternities affiliated with the monasteries, was the Third Order, an institute which has defied classification.