Commentary on the Subsampling Procedures Used for Rapid Bioassessments

Courtemanch, David L.

doi:10.2307/1467284

Cited by 74 publications

(70 citation statements)

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“…1 para acrónimos de los sitios). esta medida para hacer comparaciones entre sitios, con el fin de contestar a la pregunta si las comunidades difieren entre sí (e.g., sitios a evaluar vs sitios de referencia) (Courtemanch, 1996;Vinson & Hawkins, 1996;Barbour et al, 1999;Bonada et al, 2002). En este estudio el que exista una diferencia entre la riqueza de táxones y la abundancia de macroinvertebrados acuáticos según el esfuerzo de muestreo, puede ser explicado por dos razones principales.…”

Section: Resultsunclassified

Efecto del esfuerzo de muestreo en la riqueza de táxones de macroinvertebrados acuáticos y el índice BMWP/Atitlán

Reyes-Morales

Springer

2014

RBT

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Effect of sampling effort on taxa richness of aquatic macroinvertebrates and the BMWP/Atitlán index. Aquatic macroinvertebrates are the group of organisms most commonly used to determine ecosystem health in water quality studies and freshwater biomonitoring. Nevertheless, the methods and collecting time of biomonitoring have not yet been sufficiently adapted and tested in tropical aquatic environments. Twelve rivers in the Lago de Atitlán watershed in Guatemala were assessed with different collecting times, during the dry season. The method involved the collection of organic and inorganic material including benthic organisms, from different microhabitats, for a pre-established time period (5, 10, 15min) with a D-frame net. Samples were preserved with 95% ethanol in the field, and sorted in the laboratory. As expected, the analysis showed that the abundance and taxonomic richness was higher with increasing sampling effort. The water quality categories obtained from the newly proposed BMWP/Atitlán index varied among sampling times. However, the KruskalWallis test showed no significant differences between the categories obtained with the index and the number of taxa collected at 10 and 15min. Therefore, we recommend a reduction of sample time, but maintaining the tree subsamples in order to include most variety of microhabitats and assure a representative sample of the aquatic macroinvertebrates. Rev. Biol. Trop. 62 (Suppl. 2): 291-301. Epub 2014 April 01.

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Section: Resultsunclassified

Efecto del esfuerzo de muestreo en la riqueza de táxones de macroinvertebrados acuáticos y el índice BMWP/Atitlán

Reyes-Morales

Springer

2014

RBT

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“…The development of rapid bioassessment protocols has resulted in much debate on the most efficient methods, with respect to time, cost, etc., for processing benthic invertebrate samples (Courtemanch, 1996;Growns et al, 1997;King andRichardson, 2002, Nichols andNorris, 2006). Although we did not evaluate cost and processing times, we would expect that live-sorting would be significantly faster.…”

Section: Discussionmentioning

confidence: 99%

Are bioassessments based on the Reference Condition Approach (RCA) affected by 'rapid' approaches to sample collection and processing?

Valois

Somers²,

Sarrazin-Delay³

et al. 2016

J Limnol

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“…This process is both labor and time-consuming, which often makes the counting of all individuals an unrealistic demand for laboratory work. Even though this has been argued to be the most appropriate approach to studies with benthic invertebrates (Baker & Huggins 2005), resource limitation and individuals numbers reaching the thousands often demand the subsampling of larger samples (Courtemanch 1996, Baker & Huggins 2005, Anderson & Ferrington 2012.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil

et al. 2015

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Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil. Biota Neotropica.http://dx.doi.org/10.1590/1676-06032015003914Abstract: Chironomidae is a common family in freshwaters, often occurring at high densities, which hinders the processing of large samples, given that time and labor are usually limited. The present study aims at evaluating the extent of the error related with the subsampling of Chironomidae from a larger sample with regard to the size of the individuals between a sample and the subsample. A total of 9195 chironomids were collected from three sites in an intermittent stream. Samples were taken using a Dshaped net (250 mm) on eight occasions. Individuals from each sample were homogenized in a gridded Petri dish and coordinates from lines and columns were randomly drawn. Individuals from the assigned coordinates were selected until 100 individuals or 10% of the sample were chosen. Comparisons were made between the proportion of larger ( §5mm) and smaller individuals (,5mm) between the samples and subsamples, and it was established the correlation between the size of the error and the size of the sample, using the rank coefficient of Spearman. The highest error observed was 12.7%, meaning that the difference in larger individuals between the sample and subsample reached that value. However on six of the eight samples the error was below 3%. Spearman correlation showed no significance between the error observed and the size of the sample (r=0.38, p=0.35), meaning that larger samples will not yield larger error associated with the size of the individuals. The present study indicates that the subsampling technique used is capable of drawing a random subset of individuals from a sample of chironomids with regard to their size. This technique can be used in ecological or biomonitoring studies in order to reduce sample processing time without creating a bias in the analysis. Keywords: temporary pools, sampling effort, aquatic insects.

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Commentary on the Subsampling Procedures Used for Rapid Bioassessments

Cited by 74 publications

References 0 publications

Efecto del esfuerzo de muestreo en la riqueza de táxones de macroinvertebrados acuáticos y el índice BMWP/Atitlán

Efecto del esfuerzo de muestreo en la riqueza de táxones de macroinvertebrados acuáticos y el índice BMWP/Atitlán

Are bioassessments based on the Reference Condition Approach (RCA) affected by 'rapid' approaches to sample collection and processing?

Analysis of the error associated with the subsampling of Chironomidae in an intermittent stream of semi-arid Brazil

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