Novel survey method finds dramatic decline of wild cotton-top tamarin population

Savage, Anne; Thomas, Len; Leighty, Katherine A.; Soto, Luis H.; Medina, Felix S.

doi:10.1038/ncomms1030

Cited by 106 publications

(44 citation statements)

References 23 publications

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“…O'Grady et al [36] proposed that population size was the best predictor of extinction risk and was therefore the most cost-effective data to collect on threatened species. Population monitoring is essential to evaluate the success of conservation efforts, yet standard survey methods may be ineffective because animals flee silently before they are seen [15]. Population estimation using a noninvasive genetic census technique does not require visual or physical contact with the individuals, and allow for larger sample sizes to be collected than would be possible with traditional trapping methods [24].…”

Section: Discussionmentioning

confidence: 99%

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Noninvasive genetic assessment of the population trend and sex ratio of the Shennongjia population of Sichuan snub-nosed monkeys (Rhinopithecus roxellana)

Chang

Liu

Yang³

et al. 2011

Chin. Sci. Bull.

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Effective population management relies on assessments of population size and sex ratio. However, these estimates are difficult to obtain for elusive and rare species. Recently, noninvasive genetic census methods have been developed as an alternative to traditional capture-mark-recapture methods. In this study, we estimated the size of the Sichuan snub-nosed monkey (Rhinopithecus roxellana) population in the Shennongjia Nature Reserve (SNR) using a noninvasive sampling method based on 16 microsatellite loci. We also used a PCR-based genetic method to sex the sampled individuals and infer the population sex ratio. The population size of R. roxellana in the SNR was estimated to be 1044 individuals (95% CI TIRM : 613-1409). The estimated population sex ratio is more female-biased than expected, which we attribute to the sampling biased towards one male units and limited sampling of bachelor male units. Moreover, there is no suggestion that the heavy traffic road through the reserve might block movement of monkeys. The results of this study indicate genetic assessments based on a noninvasive sampling method can provide useful information regarding populations of elusive primates.

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Section: Discussionmentioning

confidence: 99%

“…The most commonly used census method is individual counts based on line transects. However, traditional line transect methods do not work well for arboreal primates that tend to flee silently through the forest canopy before being counted [15]. In addition, vegetation can often hamper efforts to spot and count individuals.…”

mentioning

confidence: 99%

Noninvasive genetic assessment of the population trend and sex ratio of the Shennongjia population of Sichuan snub-nosed monkeys (Rhinopithecus roxellana)

Chang

Liu

Yang³

et al. 2011

Chin. Sci. Bull.

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“…Our own research has benefited from strong collaborations between statisticians and ecologists, but we note that many researchers do not have the resources that can be taken for granted in academic settings in wealthy countries (Gimenez et al 2013). We have been involved in international collaborations to estimate wildlife abundance and conservation status in countries with little funding for biodiversity monitoring (Moore et al 2010, Savage et al 2010, Lewison et al 2014, Williams et al 2016b and in efforts to help colleagues, particularly students, leverage (i.e. make use of existing but unpublished) historical survey data.…”

Section: Distance Sampling: Assumptions and Challenges For Small-boatmentioning

confidence: 99%

Animal Counting Toolkit: a practical guide to small-boat surveys for estimating abundance of coastal marine mammals

Williams¹,

Ashe²,

Gaut³

et al. 2017

Endang. Species. Res.

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Small cetaceans (dolphins and porpoises) face serious anthropogenic threats in coastal habitats. These include bycatch in fisheries; exposure to noise, plastic and chemical pollution; disturbance from boaters; and climate change. Generating reliable abundance estimates is essential to assess sustainability of bycatch in fishing gear or any other form of anthropogenic removals and to design conservation and recovery plans for endangered species. Cetacean abundance estimates are lacking from many coastal waters of many developing countries. Lack of funding and training opportunities makes it difficult to fill in data gaps. Even if international funding were found for surveys in developing countries, building local capacity would be necessary to sustain efforts over time to detect trends and monitor biodiversity loss. Large-scale, shipboard surveys can cost tens of thousands of US dollars each day. We focus on methods to generate preliminary abundance estimates from low-cost, small-boat surveys that embrace a 'training-while-doing' approach to fill in data gaps while simultaneously building regional capacity for data collection. Our toolkit offers practical guidance on simple design and field data collection protocols that work with small boats and small budgets, but expect analysis to involve collaboration with a quantitative ecologist or statistician. Our audience includes independent scientists, government conservation agencies, NGOs and indigenous coastal communities, with a primary focus on fisheries bycatch. We apply our Animal Counting Toolkit to a smallboat survey in Canada's Pacific coastal waters to illustrate the key steps in collecting line transect survey data used to estimate and monitor marine mammal abundance.

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“…Callicebus discolor Dacier et al, 2011), or strip transects (e.g. Saguinus oedipus Savage et al, 2010). Here we focus on the use of playbacks to estimate population densities, though some of the content will be of interest for those using playbacks to survey primate presence.…”

Section: Andrea Salcedo R Manuel Mejia Katie Slocombe Sarah Papworthmentioning

confidence: 99%

“…Although distance sampling requires that individuals do not move in response to playbacks, other methods can still be used. For example, Savage et al, (2010) found that cotton-top tamarins (Saguinus oedipus) are attracted to playbacks of conspecific calls from 150-200m, and so used strip transects and lured individuals to the census line with playbacks.…”

Section: Andrea Salcedo R Manuel Mejia Katie Slocombe Sarah Papworthmentioning

confidence: 99%

Two case studies using playbacks to census neotropical primates: <i>Callicebus discolor</i> and <i>Alouatta palliata aequatorialis</i>

et al. 2014

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Novel survey method finds dramatic decline of wild cotton-top tamarin population

Cited by 106 publications

References 23 publications

Noninvasive genetic assessment of the population trend and sex ratio of the Shennongjia population of Sichuan snub-nosed monkeys (Rhinopithecus roxellana)

Noninvasive genetic assessment of the population trend and sex ratio of the Shennongjia population of Sichuan snub-nosed monkeys (Rhinopithecus roxellana)

Animal Counting Toolkit: a practical guide to small-boat surveys for estimating abundance of coastal marine mammals

Two case studies using playbacks to census neotropical primates: <i>Callicebus discolor</i> and <i>Alouatta palliata aequatorialis</i>

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