Michael C. Gavin

Global drivers of human pathogen richness and prevalence

The differences in the richness and prevalence of human pathogens among different geographical locations have ramifying consequences for societies and individuals. The relative contributions of different factors to these patterns, however, have not been fully resolved. We conduct a global analysis of the relative influence of climate, alternative host diversity and spending on disease prevention on modern patterns in the richness and prevalence of human pathogens. Pathogen richness (number of kinds) is largely explained by the number of birds and mammal species in a region. The most diverse countries with respect to birds and mammals are also the most diverse with respect to pathogens. Importantly, for human health, the prevalence of key human pathogens (number of cases) is strongly influenced by disease control efforts. As a consequence, even where disease richness is high, we might still control prevalence, particularly if we spend money in those regions where current spending is low, prevalence is high and populations are large.

Estimating Illegal Resource Use at a Ugandan Park with the Randomized Response Technique

Illegal resource use is a major threat to conservation in protected areas throughout the world, yet accurately estimating the number of poachers has been difficult. People violating the law seldom identify themselves for fear of retribution; thus quantifying illegal resource use is constrained by methodological problems. We evaluate the effectiveness of the randomized response technique (RRT) with a population that is partially illiterate to assess the extent of illegal resource use at Kibale National Park, Uganda. RRT is unique in allowing respondents to disclose sensitive information because the interviewer can not ascertain an individuals true response to the incriminating question. We found estimates of six types of illegal resource use when measured by RRT were significantly higher than when measured by direct questioning. This method offers a potentially powerful tool for understanding conservation threats in the developing world.

Trade-Offs between Cattle Production and Bird Conservation in an Agricultural Frontier of the Gran Chaco of Argentina

Intensification of food production in tropical landscapes in the absence of land-use planning can pose a major threat to biological diversity. Decisions on whether to spatially integrate or segregate lands for production and conservation depend in part on the functional relations between biological diversity and agricultural productivity. We measured diversity, density, and species composition of birds along a gradient of production intensification on an agricultural frontier of the Argentine Chaco, where dry tropical forests are cleared for cattle production. Bird species diversity in intact forests was higher than in any type of cattle-production system. Bird species richness decreased nonlinearly as cattle yield increased. Intermediate-intensity silvopastoral systems, those in which forest understory is selectively cleared to grow pastures of non-native plants beneath the tree canopy, produced 80% of the mean cattle yield obtained in pastures on cleared areas and were occupied by 70-90% of the number of bird species present in the nearest forest fragments. Densities of >50% of bird species were significantly lower in open pastures than in silvopastoral systems. Therefore, intermediate-intensity silvopastoral systems may have the greatest potential to sustain cattle yield and conserve a large percentage of bird species. However, compared with low-intensity production systems, in which forest structure and extent were intact, intermediate-intensity silvopastoral systems supported significantly fewer forest-restricted bird species and fewer frugivorous birds. These data suggest that the integration of production and conservation through intermediate-intensity silvopastoral systems combined with the protection of forest fragments may be required to maintain cattle yield, bird diversity, and conservation of forest-restricted species in this agricultural frontier.

The randomized response technique as a tool for estimating non-compliance rates in fisheries: a case study of illegal red abalone (Haliotis rufescens) fishing in Northern California.

Illegal fishing has detrimental environmental and social impacts, but these effects are difficult to mitigate without reliable estimates of fisher non-compliance. Methods used by fisheries managers to estimate illegal fishing often require indirect estimation of poaching using biological, economic or sociological indicators. This study presents a unique application of the randomized response technique (RRT) for direct estimation of non-compliance in fisheries to the Northern California recreational red abalone (Haliotis rufescens) fishery. An anonymous paper-based compliance and sociodemographic survey of recreational fishers in Sonoma and Mendocino Counties estimated 29% non-compliance with the daily take limit, 23% with the minimum size limit, 19% with licensing laws and 15% with the annual take limit. RRT results also indicated how different sociodemographic characteristics related to non-compliance. Visitors had higher non-compliance rates than local fishers for all regulations except daily take limits, which an estimated 72% of locals violated versus 18% of visitors. High fisher awareness of regulations, fisher age, income and fishing experience did not appear to influence illegal take. RRT is a powerful tool which can aid conservation managers in prioritizing action.

Perceptions of the value of traditional ecological knowledge to formal school curricula: opportunities and challenges from Malekula Island, Vanuatu

BackgroundThe integration of traditional ecological knowledge (TEK) into formal school curricula may be a key tool for the revitalisation of biocultural diversity, and has the potential to improve the delivery of educational objectives. This paper explores perceptions of the value of TEK to formal education curricula on Malekula Island, Vanuatu. We conducted 49 interviews with key stakeholders (local TEK experts, educators, and officials) regarding the use of the formal school system to transmit, maintain, and revitalise TEK. Interviews also gathered information on the areas where TEK might add value to school curricula and on the perceived barriers to maintaining and revitalising TEK via formal education programs.ResultsParticipants reported that TEK had eroded on Malekula, and identified the formal school system as a principal driver. Most interviewees believed that if an appropriate format could be developed, TEK could be included in the formal education system. Such an approach has potential to maintain customary knowledge and practice in the focus communities. Participants identified several specific domains of TEK for inclusion in school curricula, including ethnomedical knowledge, agricultural knowledge and practice, and the reinforcement of respect for traditional authority and values. However, interviewees also noted a number of practical and epistemological barriers to teaching TEK in school. These included the cultural diversity of Malekula, tensions between public and private forms of knowledge, and multiple values of TEK within the community.ConclusionsTEK has potential to add value to formal education systems in Vanuatu by contextualising the content and process of curricular delivery, and by facilitating character development and self-awareness in students. These benefits are congruent with UNESCO-mandated goals for curricular reform and provide a strong argument for the inclusion of TEK in formal school systems. Such approaches may also assist in the maintenance and revitalisation of at-risk systems of ethnobiological knowledge. However, we urge further research attention to the significant epistemological challenges inherent in including TEK in formal school, particularly as participants noted the potential for such approaches to have negative consequences.

Barriers and triggers to community participation across different stages of conservation management.

Local community involvement in natural resource management can be critical to conservation success. Community participation in conservation efforts varies widely, reflecting a continuum from protectionist conservation mechanisms to programmes driven by local communities. Conservation is not one event, but an iterative process with many steps (planning, implementation, monitoring) each with an opportunity for different levels of participation. Barriers and triggers to more community involvement in management of the Cordillera Azul National Park (Peru) were examined. Eleven conservation officials and 73 community members provided information on levels of participation achieved at three management stages: Park establishment, management plan development, and management implementation. Park establishment was not a participatory process, owing to the expediency of the conservation agenda and a narrow window of political opportunity. Community involvement increased during the management plan development and its implementation, with communities eager to participate and a public-private partnership introducing new participatory management tools. However, a perceived lack of capacity in terms of community skills, funding availability, time and sufficient conservation personnel, and the definitions of participation used by different stakeholders, limited community involvement in decision-making processes. If conservation is to achieve more effective community involvement, long-term adaptive co-management approaches are needed that clearly define local participation, build capacity of all stakeholders and monitor levels of participation across all stages of project management.

Traditional Ecological Knowledge Informing Resource Management: Saxoul Conservation in Inner Mongolia, China

We examine Mongolian herders’ traditional ecological knowledge (TEK) of saxoul (Haloxylon ammodendron), a keystone tree species in the Gobi desert. Government conservation planning, focused on closed reserves and aerial seeding, has alienated Mongolians and further degraded saxoul populations. We collected information from all Mongolian families (n = 85 individuals from 33 families) in the community of Hatuhuduge Gacha using semi-structured interviews, trend analysis, resource mapping, and participant observation. Mongolian knowledge of saxouls natural history and traditional management could have provided alternative conservation strategies. However, historical policies that limit indigenous power over resources, centralize planning, and contribute to TEK loss place large barriers on TEKs integration into conservation.