The physiological effects of psychological stress

The study of behavior is a powerful tool in the captive management of wild animals. It can, if properly applied, provide insight into a wide variety of problems. The interpretation of behavioral observations requires a firm understanding and characterization of the environmental parameters that can induce the physiological state of stress through neurological means in the study subjects. These factors include, but are not limited to, territorial factors, including social and physical accommodations, photo factors, and acoustical factors. Proper interpretation of behavioral observations also requires a basic understanding of the biochemical and physiological impacts of neuroendocrine-mediated stress. These include alterations in an individual's ability to metabolize toxic substances, resist infections, and reproduce. Confounding effects of these alterations must be considered in the examination of behavioral data. The most powerful experimental designs in comparative behavior are those that concurrently examine environmental stressors, physiological status, and behavior.     

Territorial behavior of Western Sandpipers on their nonbreeding grounds: effect of sex and foraging interference

ABSTRACT Nonbreeding shorebirds often alternate social structure between anonymous flocks and territorial behavior in response to different environmental factors. To evaluate specific drivers for one species, we studied the spacing behavior of wintering Western Sandpipers (Calidris mauri) at Bahía Santa María, northwestern Mexico, using behavioral observations. The density, population structure, and territorial behavior of Western Sandpipers differed among three habitat types. Cattail marshes supported 110 birds per ha, 49% males, and no territorial birds. Mangrove flats supported 288 birds per ha, 58% males, and 5% territorial birds. Brackish flats supported 365 birds per ha, 76% males, and 7% territorial birds. Territories consisted of rectangular strips (5–9 m long, N= 77). Territory length was not related to either bird density or number of territorial birds by plot, but was positively related to nearest bird distance. Aggression rate was inversely related to territory length, suggesting that territory length is set by the costs of defense. Foraging rate was independent of territory length, and prey densities in territories did not differ from those in areas used by nonterritorial birds. Males were more likely to be territorial and had a higher aggression rate than females, suggesting that males, which forage more on surface prey, were more affected by foraging interference. Our results suggest that the territorial behavior of Western Sandpipers in our study was an opportunistic strategy to reduce foraging interference. The variation in spacing behavior we documented provides evidence that interference competition affects the social structure of Western Sandpipers during the nonbreeding season.     

A review of mangrove rehabilitation in the Philippines: successes,failures and future prospects

From half a million hectares at the turn of the century, Philippine mangroves have declined to only 120,000 ha while fish/shrimp culture ponds have increased to 232,000 ha. Mangrove replanting programs have thus been popular, from community initiatives (1930s–1950s) to government-sponsored projects (1970s) to large-scale international development assistance programs (1980s to present). Planting costs escalated from less than US$100 to over $500/ha, with half of the latter amount allocated to administration, supervision and project management. Despite heavy funds for massive rehabilitation of mangrove forests over the last two decades, the long-term survival rates of mangroves are generally low at 10–20%. Poor survival can be mainly traced to two factors: inappropriate species and site selection. The favored but unsuitable Rhizophora are planted in sandy substrates of exposed coastlines instead of the natural colonizers Avicennia and Sonneratia. More significantly, planting sites are generally in the lower intertidal to subtidal zones where mangroves do not thrive rather than the optimal middle to upper intertidal levels, for a simple reason. Such ideal sites have long been converted to brackishwater fishponds whereas the former are open access areas with no ownership problems. The issue of pond ownership may be complex and difficult, but such should not outweigh ecological requirements: mangroves should be planted where fishponds are, not on seagrass beds and tidal flats where they never existed. This paper reviews eight mangrove initiatives in the Philippines and evaluates the biophysical and institutional factors behind success or failure. The authors recommend specific protocols (among them pushing for a 4:1 mangrove to pond ratio recommended for a healthy ecosystem) and wider policy directions to make mangrove rehabilitation in the country more effective.     

The specific use of nesting territory by the lesser sandhill crane in Yakutia

The left Indigirka riverside in Yakutia is the western periphery of the habitat of the lesser sandhill crane. The size of its population, time budget, and use of territory during the nesting season were studied in the period from 1998 to 2007. The density of population of this species is much lower here than in the northwest of Chukotka and in Alaska, which is reflected in the specific behavior of broods. For a decade, the size of its population increased more than 20 times.     

Empathic Differences in Adults as a Function of Childhood and Adult Pet Ownership and Pet Type

ABSTRACT

Prompted by interesting but ambiguous findings that empathic differences in children may relate to pet preference and ownership, we extended the issue to an adult population. We investigated empathic-type responses in adults who lived with cats and/or dogs in childhood (Child-Pet) and currently (Adult-Pet), using the Interpersonal Reactivity Index (IRI), the Empathy Quotient (EQ), and the Animal Attitude Scale (AAS). Multivariate analyses of covariance, with Sex as the covariate (MANCOVA), revealed differences on the AAS, the IRI-Personal Distress scale, and the EQ-Social Skills factor. For the Child-Pet data, the Dog-Only and the Both (dog and cat) groups, compared with those in the Neither (no dog or cat) group, scored lower on the IRI-Personal Distress scale and higher on the EQ-Social Skills factor. On the AAS, all three pet groups (Dog-Only, Cat-Only, and Both) had higher ratings than the Neither group. For Adult-Pet data, the analyses revealed the Dog-Only group was lower on Personal Distress than the Neither group, and higher on Social Skills than the Neither group and the Cat-Only group. On the AAS, the Neither group was lower than all three pet-owning groups, like the childhood data, but strikingly, adults with both dogs and cats were higher on the AAS. The findings support research linking companion animals with empathic development. They warrant the continued exploration of the nature of empathic development (i.e., nature vs. nurture) and contribute to the increasing research field exploring the value of companion animals.     

Pet Ownership,Other Domestic Relationships,and Satisfaction with Life among Seniors: Results from a Canadian National Survey

ABSTRACT

Given unprecedented aging in the global population along with the physical and psychological challenges associated with aging, it is important to identify ways to protect and promote quality of life for seniors. Previous research has suggested that pet ownership may confer a variety of health and social benefits among seniors. The purpose of this analysis was to determine whether pet ownership was associated with satisfaction with life among Canadian seniors. Quantitative data were obtained from the Canadian Community Health Survey—Healthy Aging, a nationally representative survey of Canadians ≥ 45 years of age conducted between December 2008 and November 2009. Analyses were restricted to a subsample of 11,973 individuals ≥ 65 years of age, and multiple logistic regression was used to model the relationship between pet ownership and satisfaction with life while controlling for sociodemographic factors. The final model was stratified to detect interaction. Pet ownership was negatively correlated with satisfaction with life in the sample as a whole (AOR = 0.79, 95% CI = 0.72–0.87) and among those who were married, in common-law relationships, and/or lived with others, while no association was found among those who were widowed, single, or living alone. Among those who were both divorced and living alone, pet ownership demonstrated the potential for being associated with greater satisfaction with life (AOR = 1.24, 95% CI = 0.89–1.73). Overall, this analysis showed that the relationship between seniors and their pets is complex. Whether pet ownership correlates with satisfaction with life appears to depend on the presence and nature of other domestic relationships.