A Paired‐Laser Photogrammetric Method for In Situ Length Measurement of Benthic Fishes

Rizzo, Austin A.; Welsh, Stuart A.; Thompson, Patricia A.

doi:10.1080/02755947.2016.1235632

Cited by 11 publications

(8 citation statements)

References 27 publications

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“…In comparison with laser photogrammetry, SVCS photogrammetry is fundamentally more accurate due to its use of paired cameras (Webster et al., 2010). Laser photogrammetry uses a single camera with a pair of parallel lasers (Deakos, 2010; Perry et al., 2018; Rizzo et al., 2017) and accuracy measurements range from 0.39% to 5.2% (Deakos, 2010; Rogers et al., 2017; Trobbiani et al., 2018). In comparison, our error measurements ranged from −0.61% (±0.11 SE ) to −4.46% (±0.31 SE ).…”

Section: Discussionmentioning

confidence: 99%

Validating the use of stereo‐video cameras to conduct remote measurements of sea turtles

Siegfried

Fuentes

Ware

et al. 2021

Ecology and Evolution

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Section: Discussionmentioning

confidence: 99%

Validating the use of stereo‐video cameras to conduct remote measurements of sea turtles

Siegfried

Fuentes

Ware

et al. 2021

Ecology and Evolution

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“…This interactive effect with turbidity may also influence observer detection of the darter and was included as a covariate for both reasons. (Rizzo et al, 2017). Additionally, adjusted population estimates were similar throughout the sampling season, lending support to our assumption that our populations were closed.…”

Section: Data Collectionsupporting

confidence: 80%

“…By structuring the data like this, it essentially creates an open model in which abundance [site,year] is completely independent of abundance [site, year+1]. Demographic closure was assumed for each 'stacked' site based on analysis of population size structure throughout the season (Rizzo et al, 2017b). Additionally, adjusted population estimates were similar throughout the sampling season, lending support to our assumption that our populations were closed.…”

Section: Data Analysesmentioning

confidence: 61%

“…Our study indicates short-term responses in Diamond Darter abundances to an extreme flood event in the Elk River, West Virginia were negligible. Previous research on this species suggests that only one cohort of Diamond Darters is being detected in glide habitat of the river (Rizzo et al, 2017b). Consequently, our analysis regarding the short-term effects of the flood on this species is restricted to this one cohort of individuals.…”

Section: Discussionmentioning

confidence: 99%

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What Shadows We Pursue: Death, Democracy, and Disunion in Antebellum America

Rizzo¹

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Development of techniques for assessment of population characteristics of the federally endangered Diamond Darter Austin A. Rizzo Population monitoring is an essential component of endangered species recovery programs. One species for which monitoring is needed is the federally endangered Diamond Darter Crystallaria cincotta. This species was placed on the Endangered Species List in 2013 because of its small range and population size, and because of continued anthropogenic threats to the species' habitat. The Diamond Darter is believed to occur only within the lower 50 rkm of the Elk River in West Virginia. Museum specimens indicate the Diamond Darter was once distributed throughout the Ohio River Basin, but it is now likely extirpated from the Muskingum River, the Ohio River, the Green River, and the Cumberland River drainages. Because of the Diamond Darter's small size, cryptic coloration, nocturnal behavior, and seemingly patchy distribution, along with limitations associated with current sampling methods, the species may appear to be rarer than it actually is. This may have also contributed to its late discovery as a species in 2008. As a result of several of the above-mentioned factors, the Diamond Darter is a much understudied fish with very little known about life history, population size, or current distribution. One problem with monitoring populations of rare and elusive species is detection. Failure to account for detection probability can be a major source of bias in presence-absence and count survey data, potentially resulting in false determination of species absence and underestimation of abundance, respectively. Additionally, if these variables are not accurately estimated, their relationship to associated habitat and environmental variables may also be inaccurate. Ultimately, not accounting for detection probability may lead to misinformed management decisions, which can prove costly for an endangered species. For this study, I sought to develop techniques that would allow for the assessment of population characteristics for this rare, elusive species. In my first chapter, I evaluated the precision and accuracy of photogrammetric length measurements relative to direct board measurements of Greenside Darters Etheostoma blennioides and Variegate Darters Etheostoma variatum. Agreement between board and photogrammetric measurements were high for these species, supporting photogrammetry as a useful method for obtaining length measurements of benthic stream fishes. Consequently, I applied photogrammetry in a field study of the Diamond Darter and assessed length frequency of 199 individuals throughout the sampling season. Based on these data I was able to identify a single cohort using glide habitat and estimate growth rate throughout the summer. My second chapter focused on determining if there were any seasonal and diel patterns in Diamond Darter detectability during population surveys. In addition to temporal factors, I also assessed five sampling covariates that might influence individual detection. ...

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“…Video-based methods for estimating length distributions can reduce sampling bias due to gear selectivity and provide an ethical improvement over traditional sampling methods when incidental mortality is common [ 20 , 21 ]. Visually derived length estimates are particularly valuable when even minor handling-induced mortality is a concern (e.g., endangered species) or when fish reside in protected areas and are thus unavailable for collection [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Estimating reef fish size distributions with a mini remotely operated vehicle-integrated stereo camera system

et al. 2021

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We tested the efficacy of a stereo camera (SC) system adapted for use with a remotely operated vehicle (ROV) to estimate fish length distributions at reef sites in the northern Gulf of Mexico. A pool experiment was conducted to test the effect of distance (1, 2, 3 or 5 m), angle of incidence (AOI; 0° to 40° at 5° increments), and SC baseline distance (BD; BD1 = 406, BD2 = 610, and BD3 = 762 mm camera separation) on the accuracy and precision of fish model length (288, 552, or 890 mm fork length) estimates compared to a red laser scaler (RLS). A field experiment was then conducted at 20 reef sites with SCs positioned at BD1 to compare fish length distribution estimates between the SC and RLS systems under in situ conditions. In the pool experiment, mean percent errors were consistently within the a priori selected threshold of ±5% at AOIs ≤10° at all distances with all four systems. However, SCs produced accurate estimates at AOIs up to 30° at all distances tested; 2–3 m was optimal. During reef site surveys, SCs collected 10.4 times as many length estimates from 4.3 times as many species compared to the RLS. Study results demonstrate that, compared to laser scalers, ROV-based SC systems can substantially increase the number of available fish length estimates by producing accurate length estimates at a wider range of target orientations while also enabling measurements from a greater portion of the cameras’ field of view.

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A Paired‐Laser Photogrammetric Method for In Situ Length Measurement of Benthic Fishes

Cited by 11 publications

References 27 publications

Validating the use of stereo‐video cameras to conduct remote measurements of sea turtles

Validating the use of stereo‐video cameras to conduct remote measurements of sea turtles

What Shadows We Pursue: Death, Democracy, and Disunion in Antebellum America

Estimating reef fish size distributions with a mini remotely operated vehicle-integrated stereo camera system

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