Influence of spatial resolution on assessing channelization impacts on fish and macroinvertebrate communities in a warmwater stream in the southeastern United States

Smiley, Peter C.; Dibble, Eric D.

doi:10.1007/s10661-007-9787-y

Cited by 16 publications

(15 citation statements)

References 23 publications

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“…Few other studies have addressed this hypothesis (e.g. Townsend, Scarsbrook & Doledec, 1997; Smiley & Dibble, 2008), and in all cases significant effects were observed mostly at the finest spatial resolution.…”

Section: Discussionmentioning

confidence: 92%

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Scale‐dependent effects of fine sediments on temperate headwater invertebrates

2008

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Summary 1. Anthropogenic activities can increase fine sediment supply to streams over multiple spatial and temporal extents. Identifying the processes responsible, and the scale at which any effects on stream organisms become evident, are key management needs, but appropriately scaled surveys are surprisingly few. 2. We surveyed macroinvertebrates and superficial fine sediments at two spatial resolutions (reach‐ and patch‐scale) in tributaries of the River Usk, a temperate, montane catchment in rural Wales (U.K.). Land use, habitat and geomorphological character were measured on‐site or derived from an existing database (=Fluvial Audit). We aimed to identify: (i) how in‐stream sediments varied with land use and associated geomorphology; (ii) likely consequences for macroinvertebrates and (iii) any scale‐dependence in relationships between macroinvertebrates and sediment character. 3. At both the reach‐ and patch‐scales, bed cover by fine sediment was related directly to the extent of eroding banks 500 m upstream. In turn, sedimentation and bank erosion were negatively correlated with catchment or riparian woodland extent. 4. At the reach scale, macroinvertebrate composition varied with catchment land use and stream chemistry, with richness declining as rough grazing or woodland was replaced by improved grassland. There was no response to deposited sediment except for weak increase in the relative abundance of oligochaetes. 5. By contrast, at the patch scale, fine sediments were accompanied by pronounced changes in invertebrate composition, and we ranked the 27 most common taxa according to their apparent sediment tolerance. General estimating equations showed that total and Ephemeroptera, Plecoptera and Trichoptera richness decreased significantly by 20% and 25% at the most sediment impacted sites (30% cover) by comparison with sediment‐free sites. 6. We conclude that sediment deposition in the upper Usk system mostly reflects local bank erosion, with riparian woodland likely to mediate this process through bank stability. Fine sediment release had marked ecological effects, but these were detectable only at patch‐to‐patch scales. We suggest that investigation of localized sediment release in streams will benefit from scale‐dependent or scale‐specific sampling, and some effects could go undetected unless sample resolution is selected carefully.

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Section: Discussionmentioning

confidence: 92%

“…using more smaller‐size sampling units) variation in response variables and sensitivity of statistical tests should also increase (e.g. Smiley & Dibble, 2008).…”

Section: Introductionmentioning

confidence: 99%

Scale‐dependent effects of fine sediments on temperate headwater invertebrates

2008

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“…Mean percentage fine bed sediment cover was positively correlated with the mean total suspendable bed sediment concentration. Although PSI was not related to the total suspendable bed sediment concentration, this may be due to the difference in sampling resolution (Smiley & Dibble, ; Larsen, Vaughan & Ormerod, ). Whereas in this study sedimentation was measured at a patch scale by taking three systematic samples across the river channel, the invertebrate sampling was undertaken at a reach scale with habitats sampled in proportion to their availability.…”

Section: Discussionmentioning

confidence: 99%

“…Whereas in this study sedimentation was measured at a patch scale by taking three systematic samples across the river channel, the invertebrate sampling was undertaken at a reach scale with habitats sampled in proportion to their availability. Previous studies have found that the choice of sampling scale may influence the ability to detect treatment effects (Smiley & Dibble, ). Further, the different relationships between the PSI and the two bed sedimentation variables found in this study demonstrate the difficulty in measuring sediment settling rates that are likely to change both temporally and spatially (Kefford et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Testing the pressure‐specific invertebrate index (PSI) as a tool for determining ecologically relevant targets for reducing sedimentation in streams

et al. 2013

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2. Five macro-invertebrate indices were calculated from 51 samples taken from 13 sampling locations across two neighbouring, but contrasting study catchments in spring and autumn 2010 and 2011. For four of these, Environmental Quality Indices (EQIs) were also calculated as a proportion of observed to expected (O:E) macroinvertebrate scores, which were predicted for a theoretical pristine invertebrate community using the River Invertebrate Prediction and Classification System model. Principal Component Analysis has shown a clear hydromorphological andsedimentation gradient within the two study catchments. A generalised hierarchical mixed model with site as a random factor and % fine bed sediment as a fixed factor found a significant relationship between PSI and O:E PSI and % fine bed sediment cover at reach-scale sampling resolution over a moderate gradient of impact. Lotic Index for Flow Evaluation (LIFE) scores and Ephemeroptera-Plecoptera-Trichoptera (EPT) % abundance were also related to % fine bed sediment cover. However, PSI was more strongly related to % fine bed sediment cover than either LIFE or EPT % abundance. While PSI and O:E PSI were correlated with LIFE and O:E LIFE, PSI was not correlated with EPT % abundance, which suggests a differentiated response of these metrics to multiple stressors. The relationship between PSI and other invertebrate metrics should be subjected to further testing along a pronounced gradient of multiple stressors, as our findings suggest that PSI and % fine bed sediment cover have the potential to provide simple, sensitive and effective tools for setting of 'twin' ecological and physical sedimentation targets and add additional explanatory power to the existing suite of macro-invertebrate indices.

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“…El dragado para la canalización de los cauces fluviales tiene un impacto negativo sobre la biota acuática, el cual es generado principalmente por la pérdida de la heterogeneidad espacial (Lau et al 2006, Smiley & Dibble 2008. En este estudio identificamos una respuesta de carácter temporal de la comunidad de peces al dragado del cauce, evidenciada por la recuperación parcial de las comunidades, asociada a la recuperación de los hábitats del río y, probablemente, de su biota asociada (macroinvertebrados).…”

Section: Discusionunclassified

Respuesta De La Comunidad De Peces Al Dragado De Rios Costeros De La Region Del Biobio (Chile)

Ortiz-Sandoval¹,

Ortíz²,

Cifuentes³

et al. 2009

Gayana (Concepc.)

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RESUMENLas comunidades de peces de agua dulce presentan grados de resistencia y resiliencia a actividades antrópicas, los cuales se relacionan positivamente con su diversidad específica y negativamente con los niveles de intervención previa. Los ríos costeros de la zona Centro-Sur de Chile se caracterizan por albergar una diversa ictiofauna, principalmente en sus zonas bajas. En particular, el sector de potamón de los ríos Andalién y Nonguén, ambos insertos en la ciudad de Concepción, son de alto valor de conservación de su biodiversidad. En estos sectores, los eventos recurrentes de inundación de zonas residenciales, construidas en las planicies de inundación, han llevado a que ambos cauces sean dragados y semicanalizados. Las respuestas de las comunidades de peces a este tipo de intervención no han sido estudiadas en Chile. Postulamos que dada su alta diversidad, y bajo nivel de intervención previa, las comunidades ícticas de los ríos Andalién y Nonguén son resistentes y resilientes a los efectos del dragado. Para entender la respuesta comunitaria en ambos ríos, en este estudio primero analizamos los cambios en la estructura en las situaciones previo al dragado, con acciones de dragado y posterior a las mismas. En segundo lugar, analizamos las respuestas especie-específicas, para explicar los cambios comunitarios y conocer la sensibilidad de las distintas especies a esta intervención. Inmediatamente después del dragado se produjo una disminución de la diversidad específica, generándose la dominancia de una única especie, Cheirodon galusdae. Posteriormente, se evidenció una recuperación parcial de los parámetros comunitarios. Basados en las respuestas especie-específicas a este tipo de perturbación identificamos 3 especies resistentes, 3 especies resilientes y 8 especies sensibles. De estas últimas, Nematogenys inermis es la de mayor relevancia en términos de conservación.PALABRAS CLAVES: Nematogenys inermis, peces nativos, respuesta comunitaria, Río Andalién, Río Nonguén. ABSTRACTThe freshwater fish communities present degrees of resistance and resilience to human activities, which have a positive relationship with species diversity, and a negative relation with levels of previous intervention. The costal rivers in the Central-Southern zone of Chile are characterized by a diverse icthyofauna, principally in the low zones. Particularly, the potamon areas of the Andalién and Nonguén rivers, both running through the city of Concepción, have a high conservation value of biodiversity. In these areas, the reoccurring flooding in residential zones constructed over the floodplain has caused both channels to be dredged and semi-canalized. The fish community's response to this type of interventions has not been studied yet in Chile. We propose, given its high diversity and low level of previous intervention, that the fish community of the Andalién and Nonguén rivers is resilient to the effects of the dredge. To understand the community response in both rivers, we first analyzed the changes in the structure in situations...

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Influence of spatial resolution on assessing channelization impacts on fish and macroinvertebrate communities in a warmwater stream in the southeastern United States

Cited by 16 publications

References 23 publications

Scale‐dependent effects of fine sediments on temperate headwater invertebrates

Scale‐dependent effects of fine sediments on temperate headwater invertebrates

Testing the pressure‐specific invertebrate index (PSI) as a tool for determining ecologically relevant targets for reducing sedimentation in streams

Respuesta De La Comunidad De Peces Al Dragado De Rios Costeros De La Region Del Biobio (Chile)

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