A survey of research in North American zoos and aquariums

To assess the current status of research in zoos and aquariums, a 36-item survey, which replicated and expanded upon an earlier survey [Finlay and Maple, 1986], was sent to 173 American Zoo and Aquarium Association (AZA) institutions. A response rate of 71% was achieved after a second mailing. The results show that the role of research in AZA institutions has increased in the last decade. The percentage of zoos and aquariums that report conducting research, that list research as an objective of the institution, and that have a research committee/department have all increased. The number of individuals involved in research per institution has approximately doubled since 1986, and slightly less than half of responding institutions currently have a full-time position dedicated to administering research. Lack of available funds, time, and qualified personnel are the most common reasons reported for not conducting research. Zoo Biol 17:167–180, 1998. © 1998 Wiley-Liss, Inc.     

A survey of research in American zoos and aquariums

A 26-item questionnaire was distributed to 153 American zoos, aquariums, and animal parks. A response rate of 78% was achieved after a second mailing. The results indicate that most zoos encourage research and have engaged in recent research activities of some type. Behavioral and reproductive research are the most common types of scientific activity, while nonprimate mammals are the most likely research subjects. Research activity is correlated with attendance and with academic affiliations. Nearly half of the institutions surveyed reported that their research efforts were expanding.     

Survival of captive-born Ovis canadensis in North American zoos

The survival rate of North American bighorn sheep, Ovis canadensis, housed in several zoological gardens was analyzed. Complete herd histories, including birth and death data as well as causes of mortality, were collected from seven institutions. Lambs were divided into inbred and noninbred animals, with lambs being considered inbred if they had an inbreeding coefficient greater than zero. The rate of survival of inbred and noninbred lambs was compared using “survival equalling one year” and “survival equalling six months.” Another analysis compared the survival rate of male and female inbred lambs and male and female noninbred lambs. Age at death was also compared in inbred and noninbred lambs. The analysis of the data for the seven collections, located in various geographic areas and housing various subspecies, indicates that inbreeding depression is a mortality factor in the captive management of North American bighorn sheep. Therefore, long-term survival of captive or isolated wild populations will depend on maintaining genetic diversity within the herds through careful selection of breeding stock in captive populations and introduction of nonrelated animals into isolated wild populations.     

Programs for invasive research in North American zoos and aquariums

Zoo-based research in North America is an emerging field, which has progressed from an ad hoc approach in a small number of zoos to a coordinated, integrated network of scientists with recognized research programs in approximately one half of the accredited institutions in North America. The disciplines most active in these programs--veterinary medicine and pathology, nutrition, reproductive biology, contraception, and behavior--are now becoming coordinated in zoos through Scientific Advisory Groups. Zoos with research programs generally establish either an institutional animal care and use committee or another committee to evaluate research proposals. In addition to scientific merit and experimental design, zoos evaluate proposals based on factors such as priority by conservation program/identified need; direct effect on species conservation, species type, and appropriateness; availability and location of animals; operational requirements/logistics; communication between institutions; and available funding. Euthanasia is considered only in rare circumstances. Zoo-based research has evolved into an integral component in animal management and conservation programs by providing practical information that is used to improve animal care, well-being, health, and reproduction. However, the degree to which zoos participate in invasive research varies considerably among institutions, due not only to resource limitations but also to how the term "invasive" is defined and accepted at each institution. A more standardized approach among zoological institutions for examining and approving research projects that are supported by zoo-based conservation programs would greatly facilitate the wildlife research efforts of North American zoos.     

Ectoparasites from river otters in Pennsylvania.

Twenty-three livetrapped and two trapper-caught river otters (Lutra canadensis) from northeastern Pennsylvania (USA) were examined for ectoparasites immediately after their captures during 1981 to 1985. Ectoparasites were collected from both trapper-caught otters, but from only one livetrapped otter. One species of tick (Ixodes cookei) and one flea (Oropsylla arctomys) were collected.     

Use of enclosure space by captive lion-tailed macaques (Macaca silenus) housed in Indian zoos

Captive nonhuman animals use enclosure space differentially. Enclosure features strongly influence this. This study recorded both the enclosure space used by 47 captive lion-tailed macaques housed in 13 zoos across India and the behavior of the macaques. The exhibition of abnormal behaviors, food-related behaviors, and social interactions correlated significantly with the use of the edge zone (the part of the enclosure closest to the visitor area). Animals housed in barren enclosures used the edge zone to a significantly greater percentage than did those housed in complex exhibits. Percentages of autogrooming, social interactions, and food-related behaviors significantly correlated with the use of the enrich zone. Space use studies assist in recognizing areas within the enclosure, which captive animals actively use. Conversely, the studies can identify areas infrequently used and show how to make maximum use of these enclosure areas. Further studies targeting both the increase in percentages of natural behaviors exhibited and use of the enrich zone used the current study on captive lion-tailed macaques for their design.     

The reduction of abnormal behaviors in individually housed rhesus monkeys (Macaca mulatta) with a foraging/grooming board

A new environmental enrichment device, termed a “foraging/grooming board,” was presented to 8 individually housed rhesus monkeys for the explicit purpose of reducing the level of aberrant behaviors manifested by these animals. The device, consisting of a piece of plexiglass covered with artificial fleece, had particles of food treats rubbed into it and was attached to the outside of each animal's home cage. All animals foraged from the board to the point that a significant reduction in the level of abnormal behavior was noted. Most animals also groomed the fleece covering the board, utilizing the same motor patterns that would be directed toward grooming another monkey. These boards are inexpensive to construct and easy to sanitize, and do not require placing animal facility personnel at risk to maintain them.     

Biomarker responses in river otters experimentally exposed to oil contamination

Investigations in Prince William Sound (Alaska, USA) following the Exxon Valdez oil spill (EVOS) revealed that river otters (Lontra canadensis) on oiled shores had lower body mass and elevated values of biomarkers, than did otters living on nonoiled shores. In addition, otters from oiled areas selected different habitats, had larger home ranges, and less diverse diets than animals living in nonoiled areas. These differences between river otters from oiled shores and those from nonoiled areas strongly suggested that oil contamination had an effect on physiological and behavioral responses of otters. In this study, we explored the effects of crude oil contamination on river otters experimentally. We hypothesized that exposure to oil would result in elevated values of biomarkers, indicating induced physiological stress. Fifteen wild-caught male river otters were exposed to two levels of weathered crude oil (i.e., control, 5 ppm/day/kg body mass, and 50 ppm/day/kg body mass) under controlled conditions in captivity at the Alaska Sealife Center in Seward (Alaska, USA). Responses of captive river otters to oil ingestion provided mixed results in relation to our hypotheses. Although hemoglobin (Hb, and associated red blood cells) and white blood cells, and possibly interleukin-6 immunoreactive responded in the expected manner, other parameters did not. Aspartate aminotransferase, alanine aminotransferase, and haptoglobin (Hp), did not increase in response to oiling or decreased during rehabilitation. Conversely, principle-component analysis identified values of alkaline phosphatase as responding to oil ingestion in river otters. Our results suggested that opposing processes were concurring in the oiled otters. Elevated production of Hp in response to tissue damage by hydrocarbons likely occurred at the same time with increased removal of Hp-Hb complex from the serum, producing an undetermined pattern in the secretion of Hp. Thus, the use of individual biomarkers as indicators of exposure to pollutants may lead to erroneous conclusions because interactions in vivo can be complicated and act in opposite directions. Additionally, the biomarkers used in investigating effects of oiling on live animals usually are related to the heme molecule. Because of the opposing processes that may occur within an animal, data from a suite of heme-related biomarkers may produce results that are difficult to interpret. Therefore, we advocate the exploration and development of other biomarkers that will be independent from the heme cycle and provide additional information to the effect of oiling on live mammals.     

Physiologic and electrocardiographic responses of American river otters (Lutra canadensis) during chemical immobilization and inhalation anesthesia

Rectal temperatures and heart rates of American river otters (Lutra canadensis) decreased significantly (P less than 0.05) during chemical immobilization with i.m. ketamine hydrochloride in combination with xylazine hydrochloride and acepromazine and during inhalation anesthesia with isoflurane. Anesthetized otters showed a tendency for apnea during induction and while dorsally recumbent, which was reflected by a respiratory acidosis on arterial blood gases. Declines in rectal temperatures and heart rates were not found to be a function of dosage (mg/kg) of the ketamine combination used except for rectal temperatures of otters in relatively poor body condition (inanition). The electrocardiograms of isoflurane-anesthetized otters were similar to those recorded on immobilized otters with the exception of an r' deflection in the ventricular depolarization complex (RSr'). Electrocardiographic criteria were not found which predicted the degree of right ventricular or generalized cardiac enlargement seen radiographically.     

Cage toys reduce abnormal behavior in individually housed pigtail macaques

As part of a behavioral intervention program that identifies and treats individual nonhuman primates exhibiting abnormal behavior, five individually housed pigtail macaques (Macaca nemestrina) were provided with multiple cage toys in an effort to reduce high levels of abnormal behavior. Ten 30-min observations of each subject were conducted during the baseline condition and again after novel toys were presented, both loose inside the cage and attached to the outside of the cage. The new toys were used during 27% of the observation time. Kong Toys were used most consistently by the macaques during the 5-week observation period. Significant decreases in abnormal behavior and cage-directed behavior, as well as significantly increased enrichment use, were evident after the toys were added. Several of the toys were destroyed quickly, and individual differences were evident in the levels of enrichment use and abnormal behavior. Providing multiple manipulable toys as enrichment for pigtail macaques was effective in reducing abnormal behavior and was an important part of an environmental enrichment program for monkeys who could not be housed socially.     

Herpetological research in zoos: A literature survey, 1977–1981

Herpetological zoo research published in three journals between 1977 and 1981 was surveyed. Fifty-three of 1,084 published papers involved zoos. Research for 30 papers was conducted in zoos. Just under three fourths of zoo papers involved behavioral research. Sixteen zoos were involved in research in this survey.     

A captive behavioral enrichment study with Asian small-clawed river otters (Aonyx cinerea)

Asian small-clawed river otters (Aonyx cinerea) were given the opportunity to hunt for and capture live crickets (Acheta domestica) in a public interactive display. The otters learned the experimental routine during the first day of exposure. Different response levels were recorded at each of three capture sites, A, B, and C. The animals showed continued motivation for hunting despite the fact that there was no deprivation and the crickets represented an insignificant part of the diet. Besides live crickets, other items—cat food, dead crickets, and gelatin capsules—were introduced for five days each. The otters made the most captures per opportunity for live crickets, followed, in order of preference, by dead crickets, cat food, and gelatin capsules. Although gelatin capsules were found to be the least motivating prey item, the otters hunted for them whenever they were offered. Thus, any active opportunity to produce a change in their environment was rewarding to the otters.     

Stereotypies and other abnormal repetitive behaviors: potential impact on validity, reliability, and replicability of scientific outcomes

Normal behavior plays a key role in facilitating homeostasis, especially by allowing the animal to control and modify its environment. Captive environments may interfere with these behavioral responses, and the resulting stress may alter many physiological parameters. Abnormal behaviors indicate that an animal is unable to adjust behaviorally to the captive environment and, hence, may be expressing abnormal physiology. Therefore, captive environments may affect the following aspects of an experiment: validity, by introducing abnormal animals into experiments; reliability, by increasing interindividual variation through the introduction of such individuals; and replicability, by altering the number and type of such individuals between laboratories. Thus, far from increasing variability, enrichment may actually improve validity, reliability, and replicability by reducing the number of abnormal animals introduced into experiments. In this article, the specific example of abnormal repetitive behaviors (ARBs) is explored. ARBs in captive animals appear to involve the same mechanisms as ARBs in human psychiatry, which reflect underlying abnormalities of brain function. ARBs are also correlated with a wide range of behavioral changes that affect experimental outcomes. Thus, ARBs in laboratory animals may compromise validity, reliability, and replicability, especially in behavioral experiments; and enrichments that prevent ARB may enhance validity, reliability, and replicability. Although many links in this argument have been tested experimentally, key issues still remain in the interpretation of these data. In particular, it is currently unclear (1) whether or not the differences in brain function seen in animals performing ARB are abnormal, (2) which common behavioral paradigms are affected by ARB, and (3) whether enrichment does indeed improve the quality of behavioral data. Ongoing and future work addressing these issues is outlined.     

Visitor behavior in zoos: A review

Abstract

Visitors are integral components of zoological parks and their importance has led to a research area devoted to understanding the people–zoo relationship. This paper reviews, and provides a point of entry into, the literature relating to visitor research in zoos. The field emerged relatively recently and is diverse and interdisciplinary (it shares common ground with sociology, education, psychology, zoology, and other academic disciplines). Several areas can be identified in the literature (audience analysis, circulation and orientation, exhibit evaluation, and interactions with animals), and these areas have revealed visitors' demographic and behavioral characteristics, people's behavioral responses to endogenous and exogenous factors, the impact of exhibit design, and visitors' movements around zoos. Limitations of existing work include independence between research areas, lack of international studies, limited generalizability of results, and the minority status of the field. Therefore, suggestions for future work include integrating different research areas, more research from outside Europe and America, and increased interaction within the visitor research community.     

A cross sectional survey for B virus antibody in a colony of group housed rhesus macaques

A systematic sampling technique was used in combination with a highly sensitive and specific ELISA to provide unbiased age-specific prevalence estimates of B virus antibody in rhesus monkeys housed in three different outdoor breeding corrals. Among 146 sampled monkeys, 97% of animals 2.5 years and older were seropositive, while only 22% of younger animals were seropositive. Neither gender nor social dominance ranking were predictive of B virus antibody status. The strong age association was not inconsistent with hypothesized venereal transmission of B virus. Improvements in the epidemiologic understanding of B virus are necessary to assist efforts to eradicate this agent from breeding colonies of rhesus monkeys.     

A field course survey of three English river systems

A hydrobiological field course for undergraduates in the Department of Biology, University of Salford has proved useful in investigating river pollution, and parts of the course may be suitable for upper school studies. The course compares the Lancashire rivers Lune, Ribble and Irwell, but could be adapted for still waters.

The water quality was assessed by simple chemical methods and the bacteriological quality by multiple tube and membrane filtration techniques. These assessments were then related to the benthic inverte-brates in the rivers—dipteran larvae, oligochaete worms, leeches, molluscs, stoneflies and mayflies. The Irwell was found to be grossly polluted, the Ribble mildly polluted and the Lune relatively unpolluted.