Two-phase sampling to estimate river-wide populations of freshwater mussels

Villella, Rita F.; Smith, David R.

doi:10.1899/04-085.1

Cited by 19 publications

(25 citation statements)

References 11 publications

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“…Detection of all species present at a site and detection of small changes in density of individual species will require substantially greater sampling effort (up to 12 random starts or 80% of the site). It may also require the application of different sampling designs such as adaptive cluster sampling [37]. The difficulty and expense required to collect accurate and precise density estimates is well recognized [38,39], especially for populations of rare species [40].…”

Section: Discussionmentioning

confidence: 99%

“…However, the design (i.e., number and location of stations) of the overall monitoring network needs to incorporate random site selection if population-level parameters are to be estimated, and if inferences over larger spatial scales are desired [25]. Two-phase sampling strategies successfully applied in Pennsylvania [45] and West Virginia [37] could provide such an approach.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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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“…La cuenca del río Opia cuenta con una alta densidad de organismos según lo expuesto por Villela y Smith (2005), ya que la presencia de ≥1 ostra/m 2 es signo de alta densidad. El número de animales vivos es mayor en cuevas y en las grietas de las rocas, ya que son zonas de difícil acceso para el hombre (Arteaga-Sogamoso, 1993; López, et al, 2009).…”

Section: Discussionunclassified

Aspectos bioecológicos de la ostra de agua dulce Acostaea rivoli (Mollusca, Etheriidae) en el río Opia, Tolima, Colombia

Gutiérrez-Hoyos

López

Reinoso-Flórez

et al. 2017

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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ResumenLa ostra de agua dulce Acostaea rivoli es una especie endémica de Colombia, que desempeña un papel ecológico relevante en el ecosistema acuático. El presente estudio se realizó en la cuenca del río Opia departamento del Tolima en los meses de septiembre y octubre de 2009, donde se establecieron 18 estaciones de muestreo, en cada una de las estaciones fueron empleados cuadrantes de 1m 2 distribuidos en diez transectos longitudinales. Adicionalmente, fue evaluada la distribución vertical entre 1 y 3 m de profundidad. Paralelamente se evaluaron variables fisicoquímicas in situ y se tomaron muestras de agua para la determinación de 12 variables fisicoquímicas. Para evaluar la relación entre la especie y las variables fisicoquímicas se realizó un análisis de componentes principales y una correlación de Spearman. Fueron observados 303 organismos, donde la mayor densidad se presentó en la estación Lorencito con 6,67 ind/m 2 y la menor densidad en las estaciones puente Doima, molino federal y quebrada Opia en donde no se registró ningún individuo. Con relación al perfil vertical la mayor densidad se presentó en el primer metro con 29,62 ind/m 2 y la menor en el tercer metro con 4,50 ind/m 2 . Las variables fisicoquímicas que influyeron de forma significativa en la distribución y densidad de la población fueron la alcalinidad (r=0,698; p=0,001), dureza (r=0,650; p=0,004), pH (r=0,714; p=0,001), cloruros (r= -0,530; p=0,024), fosfatos (r= -0,603; p=0,008), nitratos (r= -0,490; p=0,039) y coliformes totales (r= -0,540; p=0,021). Estas variables podrían estar relacionados con los procesos de mineralización de la cuenca, que junto con un alto porcentaje de calcio, una buena oxigenación del agua y un sustrato adecuado estarían relacionados con la presencia de esta especie en la zona de estudio. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.Palabras clave: Endémica; Ostra; Tolima; Variables fisicoquímicas. Bioecological aspects of the freshwater oyster Acostaea rivoli (Mollusca, Etheriidae) in the Opia river, Tolima, Colombia AbstractThe freshwater oyster (Acostaea rivoli) is an endemic Colombian species that plays an important ecological role in the aquatic ecosystem. The present study was performed in the Opia river basin, in the Tolima department. 18 sampling stations were evaluated during September and October of 2009. In each location quadrants of 1 m 2 were distributed in ten longitudinal transects. Additionally, the vertical distribution was evaluated between 1 and 3 m deep. Parallelly, water samples were taken to analyzed 12 physicochemical variables, some of them were evaluated in situ and the others in the laboratory. In order to identify the relationships between the population and the physicochemical variables a principal component analysis and a Spearman correlation were performed. A total of 303 individuals were observed, the greatest density was recorded in the sampling site Lorencito with 6.67 ind/ m 2 and the lowest (0 ind/m 2 ) was recorded in the sites Puente Doima, Molino el Federal and Quebrada Opia. As...

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“…Many survey objectives require both qualitative and quantitative sampling methods (Strayer and Smith 2003). Conducting two-phase sampling offers a statistical framework for combining data from each of these sampling methods (Villella and Smith 2005), and should assure adequate data for all species (Obermeyer 1998). However, with the constrained budgets of many natural resource agencies, cost effective methods, such as qualitative sampling, will become more common.…”

Section: Sf(1tixtic~11 Unalysismentioning

confidence: 99%

“…Guidelines are needed to determine the appropriate sampling methods and sampling effort to satisfy study objectives (Dunn 2000;Villella and Smith 2005). While several studies have compared methods from the same sampling locations (e.g., Strayer et al 1997, Vaughn et al 1997, Obermeyer 1998, few studies (e.g., Van Cleave 1940) have compared the same method over multiple years to examine sampling efficiency.…”

Section: Introductionmentioning

confidence: 99%

Timed Search Technique Used to Evlauate Freshwater Mussel (Bivalvia: Unionidae) Species Richness in Headwater Streams: Is a Single One-Hour Visit Enough?

Tiemann¹,

Cummings²,

Mayer³

2009

Journal of Freshwater Ecology

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Freshwater mussels were sampled in the upper Mackinaw River basin, Illinois, for five years to determine if a single, one-hour visit was enough to adequately characterize the species richness at a headwater stream site when using the timed search technique. Eight sites were each handpicked for one person-hour every year, and species richness was calculated to determine if it varied by year for five years. During 39 person-hours, 2,692 live individuals of 14 species were collected. Species accumulation curves and Spearman's correlation analysis suggested that a single, one-hour visit was not adequate when using the timed search technique to determine species richness in headwater streams of the Mackinaw River basin and might not be sufficient in other basins.

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Two-phase sampling to estimate river-wide populations of freshwater mussels

Cited by 19 publications

References 11 publications

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

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

Aspectos bioecológicos de la ostra de agua dulce Acostaea rivoli (Mollusca, Etheriidae) en el río Opia, Tolima, Colombia

Timed Search Technique Used to Evlauate Freshwater Mussel (Bivalvia: Unionidae) Species Richness in Headwater Streams: Is a Single One-Hour Visit Enough?

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