Effects of temperature and hydrology on growth of shovelnose sturgeon
            <i>Scaphirhynchus platorynchus</i>
            (Rafinesque, 1820) in the lower Mississippi River

Porter, Julie; Schramm, Harold L.

doi:10.1111/jai.13548

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…Seasonally, flood pulses lead to patterns of fish growth [4,[8][9][10]. In general, fish grow faster during the high-water season and slower during the low-water season [4,9,11,12], as shown by studies on four continents [4,[9][10][11][12][13][14][15][16][17][18][19][20][21]. During the rising and high-water season, most fish species grow faster due to the increased availability of food, primary production, and inorganic nutrients, which cause fish fat reserves to grow to a seasonal maximum [22].…”

Section: Introductionmentioning

confidence: 99%

Flood Pulse Effects on the Growth of Pseudoplatystoma fasciatum in the Amazon Basin

Pereira,

Castello,

Hallerman

et al. 2024

Fishes

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Fish growth is a fundamental biological process driven by a multitude of intrinsic (within-individual) and extrinsic (environmental) factors that underpin individual fitness and population dynamics. Interannual variability in river hydrology regarding the intensity and duration of floods and droughts can induce interannual variations in the biotic and abiotic variables that regulate fish growth. However, the understanding of how interannual variability in river hydrology affects fish growth remains limited for most species and ecosystems. We evaluated how inter-annual hydrological variations within the Amazon River basin influence the growth of the catfish Pseudoplaystoma fasciatum. Our research questions were as follows: Do floods lead to the faster growth of P. fasciatum and droughts lead to the slower growth? And do floods and droughts affect all age classes in the same manner? We sampled 364 specimens of P. fasciatum from five sites in the Amazon basin, estimated their growth rates, and related the growth rates to indices of the intensity of floods and droughts. We fitted linear mixed-effects models to test the relationship between growth increments and hydrological indices (with F and D quantifying the intensities of floods and droughts, respectively), age as fixed effects, and basins and Fish ID as random effects. We found an inverse relationship between the increment width in the fish hard parts and hydrological indices. That is, intense floods and droughts negatively affected the growth rates. We also found that the growth of P. fasciatum was no different in years with intense and mild floods across age classes 1–5, although was different for age class 6. However, the growth of P. fasciatum was faster in years of mild droughts for all age classes. Our results showing that the growth of P. fasciatum was slower in years of intense droughts are supported by those of previous studies in the Amazon basin and elsewhere. However, our results showing for the first time that the growth of P. fasciatum is slower in years of intense flooding is the opposite of patterns found in other studies. These results thus suggest that the growth of P. fasciatum is maximized within an optimum range of hydrological conditions, where neither floods nor droughts are intense.

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Section: Introductionmentioning

confidence: 99%

Flood Pulse Effects on the Growth of Pseudoplatystoma fasciatum in the Amazon Basin

Pereira,

Castello,

Hallerman

et al. 2024

Fishes

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“…Otoliths are widely known as the most accurate structure used to estimate the age of teleost fishes (Campana, 2001), but otoliths of sturgeon species have an unusual shape and composition that has limited studies of otoliths as a structure to estimate age. Despite pectoral fin‐ray concerns, they continue to be the primary age‐estimation method for Shovelnose Sturgeon age and growth investigations (e.g., Hupfeld et al, 2014; Nepal et al, 2015; Porter, 2017; Thornton et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Maximum reported ages from pectoral fin rays of Shovelnose Sturgeon are around 20 years (Colombo, Garvey, Jackson, et al, 2007; Hupfeld et al, 2014; Kennedy et al, 2007; Koch et al, 2009; Nepal et al, 2015; Porter, 2017; Rugg et al, 2014; Thornton et al, 2018; Tripp, Colombo, & Garvey, 2009; Tripp, Phelps, et al, 2009), except one in Montana and North Dakota that estimated ages up to 43 years (Everett et al, 2003). Other observations from the Cedar River in Iowa recorded ~3 mm of growth annually as length approached asymptotic length (~550 mm TL; Hupfeld, 2019).…”

Section: Introductionmentioning

confidence: 99%

Bomb radiocarbon dating reveals 40‐year lifespan of Shovelnose Sturgeon (Scaphirhynchus platorynchus)—Implications for stock assessments of long‐lived, primitive fishes

Hupfeld

Lackmann

Andrews

et al. 2023

Fisheries Management Eco

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Stock assessments for Shovelnose Sturgeon have largely been limited to age and growth analyses using pectoral fin rays despite potential underestimation of age and lack of age validation. Fisheries stock assessments rely on accurate estimates of vital rates for effective fisheries management, within which fish age and lifespan are of primary importance. Age was estimated using pectoral fin rays and otolith sections, and bomb radiocarbon (14C) dating was applied to otolith cores to determine lifespan and validate ages. Age reading of fin rays was straightforward, whereas most otolith thin sections provided two age‐reading scenarios: lumping (primary increments) or splitting (finer increments) presumed annuli. While fin‐ray estimates led to a maximum age of 14 years, otolith estimates led to maximum ages of 27 and 42 years. 14C dating provided support for a combination of lumping early in life, to splitting in later years, and validation of a ~40‐year lifespan. Age reading of otoliths was imprecise and resulted in ~40% of thin sections that were not age scoreable. However, scoreable otolith sections, coupled with 14C dating, resulted in growth and lifespan information that are the most accurate to date for Shovelnose Sturgeon and can be used as a baseline toward stock assessment refinements.

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A review of the assessment techniques used for population monitoring at different life stages of sturgeons

Haxton,

Gessner,

Friedrich

2023

Environ. Rev.

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Sturgeons are a unique group of species which were historically widespread across the northern hemisphere. According to the latest IUCN Red list assessment, more than 80% of the species globally are threatened with extinction, making it essential to identify the life stages at which they are suffering from impacts the most while at the same time to compare among river systems and populations based upon standardized assessment techniques. Sturgeon all have similar, but not identical, life-history strategies. Therefore, monitoring techniques developed for one sturgeon species would be applicable to most other species. Monitoring can be conducted at each life stage. However, while each life stage will provide different information about the population, not all will necessarily help to assess population trend or status. Life stages that are highly variable prove to be less quantifiable even after expending very high effort. Collectively, these assessments could be very informative on population status, limitations, and trends. However, monitoring at each stage is time consuming and expensive. Clearly defined objectives are therefore required when embarking on an assessment program. The objective of this study was to review the assessment techniques used for the different life stages including eggs, drifting larvae, age-0, juveniles, subadults and adults to provide a common basis for population assessments that can be standardized to some extent and thus facilitate comparisons between the results obtained. For this purpose, this review presented the most common assessment techniques for each life stage, assessed the pros and cons of assessing each life stage, and examined if the methodology was qualitative or quantitative to assist in establishing long-term monitoring initiatives.

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Effects of temperature and hydrology on growth of shovelnose sturgeon Scaphirhynchus platorynchus (Rafinesque, 1820) in the lower Mississippi River

Cited by 3 publications

References 29 publications

Flood Pulse Effects on the Growth of Pseudoplatystoma fasciatum in the Amazon Basin

Flood Pulse Effects on the Growth of Pseudoplatystoma fasciatum in the Amazon Basin

Bomb radiocarbon dating reveals 40‐year lifespan of Shovelnose Sturgeon (Scaphirhynchus platorynchus)—Implications for stock assessments of long‐lived, primitive fishes

A review of the assessment techniques used for population monitoring at different life stages of sturgeons

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