Status of knowledge of the Pallid Sturgeon (<i>Scaphirhynchus albus</i>Forbes and Richardson, 1905)

Jordan, George R.; Heist, Edward J.; Braaten, Patrick J.; DeLonay, Aaron J.; Hartfield, Paul D.; Herzog, David P.; Kappenman, Kevin M.; Webb, Molly A. H.

doi:10.1111/jai.13239

Cited by 31 publications

(49 citation statements)

References 86 publications

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“…The issue of senescence is rarely raised or approached in studies and reviews dealing with sturgeon and paddlefish ecology. Nevertheless, authors have reported or claimed either a lack of senescence or at least a lack of evidence of senescence in various sturgeon species such as white sturgeon ( Acipenser transmontanus ; Hildebrand et al., ), Gulf sturgeon ( A. oxyrinchus desotoi ; Sulak et al., ), and pallid sturgeon ( Scaphirhynchus albus ; Jordan et al., ).…”

Section: Resultsmentioning

confidence: 99%

Sturgeon and paddlefish life history and management: Experts' knowledge and beliefs

2017

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Summary Although sturgeons and paddlefish represent a highly endangered species group, knowledge regarding their ecology, life history and management and restoration measures still reveals substantial gaps and uncertainties. As such, it was hypothesized that the information on overall experiences and perspectives of researchers working in the field would provide a good indication of the state of knowledge, and help identify areas for further investigation. To gain in‐depth insight into their perspectives on a variety of topics related to sturgeon life history, management and conservation, as well as opinions on issues characterized by a lack of data, a worldwide online survey was conducted among scientists specializing in sturgeon and paddlefish research. With a total of 277 respondents, the response rate was good (40.3% of those invited). The survey results indicated a high level of uncertainty with regard to various aspects of sturgeon life history, such as spawning migrations, reproduction and senescence. Responses differed largely with the origin and the research focus of the participants. Agreement on reported extreme dimensions and lifespans of sturgeons varied among species, but the level of agreement was generally higher among those scientists working on the species in question. Responses on major threats varied regionally, with dams and habitat fragmentation recognized as the major threats by researchers from North America, whereas poaching was considered the dominant threat in Europe and Asia. Sturgeon aquaculture was generally considered as having a positive effect on sturgeon protection by reducing the pressure on natural populations. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) was recognized as the most effective instrument in international sturgeon conservation. While sturgeons are generally perceived as flagship species, especially in Europe, participants questioned their potential utilization as umbrella species. Beside providing an insight into the available scientific information and the general level of consensus regarding some of the questions tackled, the results also created a basis for further discussion within the scientific community concerning the validity, relevance, and application of the published information and future research priorities.

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Section: Resultsmentioning

confidence: 99%

Sturgeon and paddlefish life history and management: Experts' knowledge and beliefs

2017

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“…Jordan et al () identifies the obstacles of collecting habitat data in a river as large and deep as the LMR with high discharge and fast current velocity. To evaluate selection for depth and current velocity, availability must be measured at a time concomitant with fish location.…”

Section: Discussionmentioning

confidence: 99%

“…Collection effort was distributed among the habitat types where sturgeon could be safely collected with trotlines, namely wing dike, secondary channel, sandbar, island tip, and natural bank (Table ). Pallid sturgeon and sympatric shovelnose sturgeon, Scaphirhynchus platorynchus (Rafinesque, 1,820), share morphological similarities throughout both species' ranges (Jordan et al, ). Recent studies document extensive hybridization between pallid sturgeon and shovelnose sturgeon in the LMR (Jordan et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…Declining numbers attributed to habitat loss and alteration and commercial harvest for roe led to federal listing as an endangered species in 1990 (Dryer & Sandoval, ). Originally occupying the entire Missouri River, the Mississippi River from Iowa south to the Gulf of Mexico, and larger associated tributaries, the present range of pallid sturgeon has been fragmented by dam construction in the Missouri River and the Mississippi River upstream of the confluence with the Missouri River (Jordan et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Pallid sturgeon seasonal habitat selection in a large free‐flowing river, the lower Mississippi River

et al. 2020

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Pallid sturgeon Scaphirhynchus albus (Forbes & Richardson, 1905, Bulletin of the Illinois State Laboratory of Natural History, 1905, 7, 37) are an endangered riverine sturgeon native to the Mississippi and Missouri rivers, and declining numbers have been attributed to multiple stressors, including habitat loss and alteration. The lower Mississippi River provides a useful context to assess pallid sturgeon habitat selection because, although altered for flood control and navigation, it provides a free‐flowing system with a diversity of habitats and a minimally altered hydrograph. A discrete choice model of data collected year‐round from two reaches for 3–5 years revealed changes in habitat selection across water temperatures and river stages representative of seasonal variation in habitat for 116 telemetry‐tagged pallid sturgeon. Natural bank, island tip, and secondary channel were positively selected and main channel, although frequently used, was avoided. The degree of selection varied among river stages, water temperatures, and reaches. Habitat selection appears to be strongly influenced by preference for locations with moderate depth (median 11.7 m; lower and upper quartiles 8.1 m and 16.3 m) and moderate current velocity (median 0.9 m/s; lower and upper quartiles 0.7 m/s and 1.2 m/s).

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“…Pallid Sturgeon are benthic fish that are captured from a wide range of depths (Carlson and Pflieger ; Jordan et al. , ; Peters and Parham ; Herrala et al. ) and velocities (Snook et al.…”

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confidence: 99%

Fin Ray Removal May Be Deleterious to Pallid Sturgeon

Steffensen

Hamel

2018

N American J Fish Manag

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Calcified fin structures are frequently used to gain an understanding of the age structure of fish populations. For Pallid Sturgeon Scaphirhynchus albus, fin rays have recently been used in microchemistry assessments to understand natal origin and interbasin movements. Although several published studies have shown minor to no ill effects from the removal of the first pectoral fin ray on other sturgeon species, it is unknown how fin ray removal affects Pallid Sturgeon over the long term in an altered river system. Therefore, our objectives were to compare recapture and survival rates of subadult (<800‐mm) and adult (≥800‐mm) Pallid Sturgeon in the lower Missouri River for fish with and without a fin ray section removed. Recapture efforts resulted in a higher recapture frequency for Pallid Sturgeon that did not have a fin ray section removed (26%) compared to those that had a fin ray section removed (11%). Subadult‐sized Pallid Sturgeon appeared to be more sensitive to fin ray removal: no subadults with a fin ray removed were recaptured, whereas recapture frequency was 22% for subadults with fin rays intact. An apparent survival estimate was not quantifiable for subadults with a section of fin ray removed, but the model estimated a 0.42 apparent survival rate for subadults with intact fin rays. Adult‐sized Pallid Sturgeon were recaptured at similar frequencies (fin ray removed: 23%; fin rays intact: 34%), and apparent survival estimates did not differ between the two groups of adults. Survival estimates are considered “apparent,” as the model could not differentiate between mortality and emigration. Our results represent a departure from previously published literature and suggest that fin ray removal may be deleterious to the survival and recovery of Pallid Sturgeon. The potential effects of fin ray removal must be thoroughly considered before initiation of future studies.

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Status of knowledge of the Pallid Sturgeon (Scaphirhynchus albusForbes and Richardson, 1905)

Cited by 31 publications

References 86 publications

Sturgeon and paddlefish life history and management: Experts' knowledge and beliefs

Sturgeon and paddlefish life history and management: Experts' knowledge and beliefs

Pallid sturgeon seasonal habitat selection in a large free‐flowing river, the lower Mississippi River

Fin Ray Removal May Be Deleterious to Pallid Sturgeon

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