2020
DOI: 10.1002/tafs.10234
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Environmental and Fish Assemblage Contrasts in Blackwater and Clearwater Streams

Abstract: We compared 15 blackwater and clearwater streams in coastal drainages of Alabama by quantifying fish assemblages and associated environmental conditions across multiple seasons and characterizing potential relationships using multivariate statistical approaches. Clearwater stream channels tended to be deeper, to have sandier substrates, and to have higher dissolved oxygen concentrations than blackwater streams. In contrast, blackwater streams showed higher dissolved organic carbon levels and higher benthic mac… Show more

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Cited by 3 publications
(6 citation statements)
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References 83 publications
(175 reference statements)
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“…Blackwater sites in the NPL and NAP did tend to have more fines (% Fines). Overall, these findings contradict expectations from prior studies which generally characterize blackwaters as being low-gradient and having a sandy bottom (e.g., Benke & Wallace, 2015;Colvin et al, 2020;Meyer, 1990). This lack of concordance with the literature likely results from sites in those studies being selected based on their unique nature whereas sites in our study were randomly selected from a pool of all possible sites in the CONUS, including smaller order streams.…”
Section: Physical Habitat Analysiscontrasting
confidence: 94%
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“…Blackwater sites in the NPL and NAP did tend to have more fines (% Fines). Overall, these findings contradict expectations from prior studies which generally characterize blackwaters as being low-gradient and having a sandy bottom (e.g., Benke & Wallace, 2015;Colvin et al, 2020;Meyer, 1990). This lack of concordance with the literature likely results from sites in those studies being selected based on their unique nature whereas sites in our study were randomly selected from a pool of all possible sites in the CONUS, including smaller order streams.…”
Section: Physical Habitat Analysiscontrasting
confidence: 94%
“…Multiple factors likely contribute to this general lack of differences across physical habitat measures within ecoregions. An important first consideration is that the water influencing the prevailing chemistry at a site classified as blackwater is, in most cases, contributed to the wetted channel by off‐channel habitats (Benke & Wallace, 2015; Colvin et al., 2020; Flotemersch, 2023; Meyer, 1990; Smock & Gilinsky, 1992) and not the result of an autochthonous process within the wetted channel. The exception to tannin‐rich water being primarily a product of off‐channel habitats is where instream conditions contribute tannins to the stream (e.g., instream swamps; Todd et al., 2009).…”
Section: Discussionmentioning
confidence: 99%
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“…In addition to the challenges of modelling flows on the coastal plain, these streams also offer challenges in measuring changes in lotic benthic macroinvertebrates assemblages (Colvin et al, 2020; Dail et al, 2013; Davis et al, 2003; USEPA, 1997). Coastal plain streams represent environments that are substantially different from streams in other ecoregions.…”
Section: Discussionmentioning
confidence: 99%