Using market data and expert opinion to identify overexploited species in the wild bird trade

Harris, J. Berton C.; Green, Jonathan M.H.; Prawiradilaga, Dewi M.; Giam, Xingli; Giyanto, _; Hikmatullah, Desy; Putra, Chairunas Adha; Wilcove, David S.

doi:10.1016/j.biocon.2015.04.009

Cited by 82 publications

(104 citation statements)

References 26 publications

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“…; Harris et al. ; Taylor et al 2015). Our database presents an opportunity to synthesize current and future data on IWU in Venezuela and other South American countries and to identify information gaps.…”

Section: Discussionmentioning

confidence: 99%

Using spatial patterns in illegal wildlife uses to reveal connections between subsistence hunting and trade

Sánchez-Mercado

Asmüssen

Rodríguez-Clark

et al. 2016

Conservation Biology

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Although most often considered independently, subsistence hunting, domestic trade, and international trade as components of illegal wildlife use (IWU) may be spatially correlated. Understanding how and where subsistence and commercial uses may co-occur has important implications for the design and implementation of effective conservation actions. We analyzed patterns in the joint geographical distribution of illegal commercial and subsistence use of multiple wildlife species in Venezuela and evaluated whether available data were sufficient to provide accurate estimates of the magnitude, scope, and detectability of IWU. We compiled records of illegal subsistence hunting and trade from several sources and fitted a random-forest classification model to predict the spatial distribution of IWUs. From 1969 to 2014, 404 species and 8,340,921 specimens were involved in IWU, for a mean extraction rate of 185,354 individuals/year. Birds were the most speciose group involved (248 spp.), but reptiles had the highest extraction rates (126,414 individuals/year vs. 3,133 individuals/year for birds). Eighty-eight percent of international trade records spatially overlapped with domestic trade, especially in the north and along the coast but also in western inland areas. The distribution of domestic trade was broadly distributed along roads, suggesting that domestic trade does not depend on large markets in cities. Seventeen percent of domestic trade records overlapped with subsistence hunting, but the spatial distribution of this overlap covered a much larger area than between commercial uses. Domestic trade seems to respond to demand from rural more than urban communities. Our approach will be useful for understanding how IWU works at national scales in other parts of the world.

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Section: Discussionmentioning

confidence: 99%

Using spatial patterns in illegal wildlife uses to reveal connections between subsistence hunting and trade

Sánchez-Mercado

Asmüssen

Rodríguez-Clark

et al. 2016

Conservation Biology

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“…This leads to a disproportionate number of 41 these most expensive species being poached from the wild (Tella and Hiraldo, 2014). 42 However, price creates a balance between supply and demand; when desirable goods 43 are expensive, trade volumes are typically lower, causing sales volumes to 44 self-regulate (Harris et al, 2015). For example, the price of pangolin products is 45 increasing, seemingly due to desirability driving ever-greater consumer demand in 46 China and Vietnam, with supply restricted by regulation and risk of prosecution 47 (Challender et al, 2015).…”

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confidence: 99%

China’s online parrot trade: Generation length and body mass determine sales volume via price

Yin

Newman

et al. 2020

Global Ecology and Conservation

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“…, Harris et al. ). On the other hand, recording search and handling times for a wide variety of species, necessary for optimal foraging, would pose onerous data collection demands, particularly when hunting is criminalized (Nuno and St John ).…”

Section: Discussionmentioning

confidence: 99%

“…, Harris et al. ). To date, the main tool for structured inference on the state of populations from catch data require time series.…”

Section: Introductionmentioning

confidence: 99%

Should I shoot or should I go? Simple rules for prey selection in multi‐species hunting systems

Chang

Drohan

2018

Ecological Applications

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Across the tropics, unregulated hunting targeting many different species presents a major conservation challenge. Prioritizing resources for monitoring and enforcement is difficult when multiple prey species are exploited. However, identifying which prey species are subject to hunting pressure can be achieved with diet choice models. We evaluate hunter diet sets using data from Southwest China and compare two diet choice models: optimal foraging theory and a relatively new diet model originating from economic optimal stopping problems. The optimal stopping diet choice model required fewer field parameters than optimal foraging models and more accurately reflected hunter catch in Southwest China. The optimal stopping model also indicated that hunters should be less selective when they experience a larger opportunity cost for their time. Finally, we illustrate a new method to evaluate harvest impact from single sites with limited data using dietary thresholds. This technique could be used to evaluate whether or not the community of exploited wildlife has shifted in its trait distribution, providing a means to anticipate trait‐biased defaunation from minimal data.

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Using market data and expert opinion to identify overexploited species in the wild bird trade

Cited by 82 publications

References 26 publications

Using spatial patterns in illegal wildlife uses to reveal connections between subsistence hunting and trade

Using spatial patterns in illegal wildlife uses to reveal connections between subsistence hunting and trade

China’s online parrot trade: Generation length and body mass determine sales volume via price

Should I shoot or should I go? Simple rules for prey selection in multi‐species hunting systems

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