The relationship between percentage of singletons and sampling effort: A new approach to reduce the bias of richness estimates

Lopez, Luiz Carlos Serramo; Fracasso, Maria Paula de Aguiar; Mesquita, Daniel Oliveira; Palma, Alexandre Ramlo Torre; Riul, Pablo

doi:10.1016/j.ecolind.2011.07.012

Cited by 29 publications

(34 citation statements)

References 22 publications

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“…None of the rarefaction curves reached the full asymptote (Figure 4), which highlights the need for more studies and new data analysis methods, as seen in the study by Lopez et al (2012), because of the high likelihood that new species may be recorded in the area studied. It is necessary to invest greater efforts in unsampled environments such as waterlogged fields and rock fields at the top of the São José mountains.…”

Section: Discussionmentioning

confidence: 99%

Communities and occurrences of Squamata reptiles in different vegetation types of the Serra de São José, Minas Gerais, Brazil

Rios

Novelli

Hudson³

et al. 2017

Biota Neotrop.

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The objective of the present study was to learn which species of Squamata reptiles occur in Protected Area São José, in Tiradentes, Minas Gerais, Brazil. Between November 2009 and December 2010 reptiles were captured. In total 157 specimens were recorded of 29 species, 16 snakes, 12 lizards and one amphisbaena. Among the snakes, Dipsadidae showed the greatest richness, with a total of nine species. The group of snakes had the highest number of species present in the community, but 79% of sampled specimens were lizards, Enyalius bilineatus being the most abundant species, with 21% of occurrence. The area with the highest richness was the Cerradão. The lower abundance was found in the Gallery Forest area (n=14), but it was the vegetation type with the highest equitability. Areas of Cerradão and Cerrado sensu strictu showed the most similarity. In these areas five species were recorded in common, Bothrops neuwiedi (n=3) being the only species of snake, and the two species of lizards most abundant in both environments were Enyalius bilineatus (n=32) and Ameivula ocellifera (n=19). Ophiodes striatus and Xenodon merremii were common to Cerradão and Dirty Field areas. There was no species recorded that were common to the environments of Cerrado and Dirty Field but two species not sympatric were found of the same genus, Tropidurus torquatus, which was found only in the Cerrado sensu strictu and Tropidurus itambere exclusively in Dirty Field. Since none of the rarefaction curves reached full asymptote, this highlights the need for further study due to the high probability of new species being recorded for the studied area.

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Section: Discussionmentioning

confidence: 99%

Communities and occurrences of Squamata reptiles in different vegetation types of the Serra de São José, Minas Gerais, Brazil

Rios

Novelli

Hudson³

et al. 2017

Biota Neotrop.

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“…To evaluate the quality of sampling effort we constructed rarefaction curves for lizards, amphibians and all herpetofauna combined, based on individuals (Gotelli and Colwell 2001), using Chao2P species estimator (Lopez et al 2012), in EstimateS 8.2.0 (Collwell 2005) and R (R Development Core Team 2009). The curves were obtained through 1,000 resampling of original data, with no reposition.…”

Section: Discussionmentioning

confidence: 99%

Herpetofauna of protected areas in the Caatinga V: Seridó Ecological Station (Rio Grande do Norte, Brazil)

Caldas¹,

Costa²,

Laranjeiras³

et al. 2016

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Abstract:We provide a list of lizards, snakes, chelonians, and amphibians collected during a 30-day expedition to the Seridó Ecological Station (ESEC Seridó), Rio Grande do Norte state, Brazil. We sampled species using thirty-seven pitfall trap stations composed of four buckets each, along with glue traps and active searches. We recorded 13 species of lizards, eight snakes, 19 amphibians, and one chelonian. Rarefaction curves suggest local biodiversity is still underestimated. Sampling during rainy season was crucial to stabilize rarefaction curve for amphibians. Comparisons of our results with data from literature show we did not capture some arboreal and semifossorial lizards known for the area. Seridó Ecological Station fauna is characterized mainly by generalist species common to lowland Caatinga sites. Still, several Caatinga endemics species are found, which underscore the importance of this small but representative protected area.

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“…High singleton frequencies indicate that species richness is underestimated, likely as a result of under-sampling [24]. Lopez et al [23] Diversity 2017, 9, 5 5 of 17…”

Section: Multi-river Datasetmentioning

confidence: 99%

“…The mean percentage of singletons was 24.5% (range: 0 to 60) and the mean number of individuals per species was 9.4 (range: 1.8 to 24.1). Based on the singleton threshold of Lopez et al [23], 70% of samples provided reliable estimates of species richness, but none of the samples met the sampling intensity threshold.…”

Section: Multi-river Datasetmentioning

confidence: 99%

“…Due to a lack of doubletons, S EST could not be calculated for 23% of sites. Accuracy of species richness estimates was further evaluated by calculating: (1) sampling intensity (the total number of individuals sampled divided by the number of species encountered) and (2) the proportion of singletons (number of species represented by one individual divided by total species number) [23]. There is an intuitive connection between singletons and species inventory completeness: the proportion of singletons is expected to decrease with increasing sampling efforts as the true proportion of singletons in the assemblage is approached.…”

Section: Multi-river Datasetmentioning

confidence: 99%

See 1 more Smart Citation

Tracking the Recovery of Freshwater Mussel Diversity in Ontario Rivers: Evaluation of a Quadrat-Based Monitoring Protocol

Reid

Morris

2017

Diversity

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Abstract:Watershed inventories and population monitoring are essential components of efforts to conserve and recover freshwater mussel diversity in Canada. We used two datasets to assess the efficacy of a quadrat-based sampling protocol for: (1) detecting mussel species at risk; (2) characterizing species composition; (3) providing accurate estimates of abundance; and (4) detecting changes in density. The protocol is based on a systematic design (with random starts) that samples 20% of monitoring sites with visual-tactile surface searches and excavation of 1 m 2 quadrats. The first dataset included 40 sampling sites in five Ontario rivers, and the second dataset consisted of complete census sampling at two 375 m 2 sites that represented contrasting mussel assemblages. Our results show that the protocol can be expected to detect the majority of species present at a site and provide accurate and precise estimates of total mussel density. Excavation was essential for detection of small individuals and to accurately estimate abundance. However, the protocol was of limited usefulness for reliable detection of most species at risk. Furthermore, imprecise density estimates precluded detection of all but the most extreme changes in density of most individual species. Meeting monitoring objectives will require either substantially greater sampling effort under the current protocol, or a fundamental revision of the sampling approach.

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The relationship between percentage of singletons and sampling effort: A new approach to reduce the bias of richness estimates

Cited by 29 publications

References 22 publications

Communities and occurrences of Squamata reptiles in different vegetation types of the Serra de São José, Minas Gerais, Brazil

Communities and occurrences of Squamata reptiles in different vegetation types of the Serra de São José, Minas Gerais, Brazil

Herpetofauna of protected areas in the Caatinga V: Seridó Ecological Station (Rio Grande do Norte, Brazil)

Tracking the Recovery of Freshwater Mussel Diversity in Ontario Rivers: Evaluation of a Quadrat-Based Monitoring Protocol

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