Morphometric Comparisons of Upper Missouri River Sturgeons

Keenlyne, Kent D.; Henry, Charles J.; Tews, Anne; Clancey, Patrick

doi:10.1577/1548-8659(1994)123<0779:mcoumr>2.3.co;2

Cited by 34 publications

(64 citation statements)

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“…Fish and Wildlife Service, 2006) have propelled the question of species discrimination to the forefront of pallid sturgeon recovery in the Middle (mouth of Missouri River to mouth of Ohio River) and Lower (mouth of Ohio River to Gulf of Mexico) Mississippi River (MMR and LMR, respectively). Recently suggested phenomena that have confounded Scaphirhynchus species discrimination include interspecific hybridization (Carlson and Pflieger, 1981; Phelps and Allendorf, 1983; Carlson et al., 1985; Keenlyne et al., 1994a,b; Simons et al., 2001; Snyder, 2002; Wills et al., 2002; Tranah et al., 2004), geographic patterns in genetic and morphometric variation (Campton et al., 2000; Tranah et al., 2001; Everett et al., 2003; this study) and regionally unique microsatellite alleles (Rob Wood, pers. comm.…”

Section: Introductionmentioning

confidence: 72%

“…has demonstrated that shovelnose and pallid sturgeon are often difficult to distinguish until a certain body size is attained (Bailey and Cross, 1954; Snyder, 2002; Kuhajda et al., 2007). In the case of the pallid sturgeon, therefore, geographic range may also be a possible influence on morphology, with changes reflected in relative distance from headwaters due to developmental responses to water temperature (Ruban and Sokolov, 1986; Keenlyne et al., 1994b; Campton et al., 2000) or due to underlying genetic differences (Campton et al., 2000; Tranah et al., 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Reports of Scaphirhynchus specimens morphologically intermediate between pallid and shovelnose sturgeon (e.g. Carlson and Pflieger, 1981) initiated many morphometric and genetic investigations into interspecific hybridization (Phelps and Allendorf, 1983; Carlson et al., 1985; Keenlyne et al., 1994a,b; Morizot, 1994; Campton et al., 2000; Simons et al., 2001; Tranah et al., 2001; Wills et al., 2002; Tranah et al., 2004; Kuhajda et al., 2007). Most of these studies examined specimens from the Missouri and Middle Mississippi rivers, a few included specimens from the Atchafalaya River in Louisiana, but none examined specimens from the Lower Mississippi River proper – the largest area of sympatry between species.…”

Section: Introductionmentioning

confidence: 99%

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Morphometric variation among river sturgeons (Scaphirhynchus spp.) of the Middle and Lower Mississippi River

et al. 2007

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Summary Pallid sturgeon (Scaphirhynchus albus) captured in the Middle and Lower Mississippi River (i.e. below St. Louis, MO, USA) are morphologically very similar to shovelnose sturgeon (Scaphirhynchus platorynchus). Available empirical data are limited to a few studies based on low sample sizes from disjointed populations. Geneticists are currently searching for markers that will differentiate the two species, but the need for unequivocal species‐specific field characters remains. Continuation of commercial fishing for shovelnose sturgeon in some states necessitates an immediate means for accurate field identifications. Previous studies of lower basin river sturgeon classified individuals with simple morphometric character indices and interpreted intermediacy as interspecific hybridization. In this study, morphometric variation among Scaphirhynchus specimens from the Middle and Lower Mississippi River is examined for evidence of hybridization. Data are compared for large (>250‐mm standard length) hatchery‐reared and wild pallid specimens and wild shovelnose specimens. Specimens are compared using two morphometric character indices, two morphometric/meristic character indices and principal components analysis. Results indicate substantial morphological variation among pallid sturgeon below the mouth of the Missouri River. The amount of variation appears to decrease downstream in the Mississippi River. Sheared principal components analysis of morphometric data shows complete separation of shovelnose and pallid sturgeon specimens, whereas character indices indicate overlap. Both character indices and sheared principal components analysis demonstrate that pallid sturgeon in the Lower Mississippi River are morphologically more similar to shovelnose sturgeon than are pallids from the Upper Missouri River. This similarity, explained in previous studies as hybridization, may be the result of latitudinal morphometric variation and length‐at‐age differences between populations of the upper and lower extremes of the range.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphometric variation among river sturgeons (Scaphirhynchus spp.) of the Middle and Lower Mississippi River

et al. 2007

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“…However, morphometric analyses of sturgeon fish to assess the degree of phenotypic plasticity in this species have rarely been conducted (Hilton and Schaefer 2002). Instead, morphological differences between wild and hatchery-reared sturgeon (Ruban andSokolov 1986, Ruban 1989) have been described for stock identification (Guenette et al 1992, Keenlyne et al 1994) and subspecies identification (Vasil'eva 2009). On the other hand, for different species the level of phenotypic plasticity has been well documented (Cramon-Taubadel et al 2005, Wintzer and Motta 2005, Wessel et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Use of geometric morphometrics to identify ecophenotypic variation of juvenile Persian sturgeon <em>Acipenser persicus</em>

Bakhshalizadeh

Bani

2017

Sci. Mar.

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Summary: Study of phenotypic variation is essential for identifying discrete phenotypic stocks. We sampled immature Persian sturgeon from the eastern and western portion of the southern Caspian Sea to test for morphological differences that could predict the ecophenotypic variation of Persian sturgeon. Geometric morphometric methods were used to quantify body shape. Configuration of landmark coordinates of fish body were scaled, translated and rotated using generalized Procrustes analysis, followed by univariate analysis of variance of resulting shape coordinates to evaluate potential morphological differences between regions. A principal component analysis was carried out to reduce the number of dimensions without the loss of information. The discriminate function analysis was performed to determine the efficacy of body landmarks for discrimination by geographic variants. Within-group linkage was inferred for dendrogram clusters using Pearson correlation distance on the basis of the average linkage method as a complement for discriminate analysis. Principle component analysis revealed that the largest differences were in body size. Most notable were differences in distance between head landmarks and the dorsal fin between eastern and western regions. Fish from the western region exhibited a longer distance from head landmarks to the dorsal fin than fish from the eastern region. Furthermore, the ventral portion of fish from the western region was longer than that of the eastern individuals. These findings show that juvenile Persian sturgeon already possess morphological traits that can be used to discriminate fish from different regions. Furthermore, these differences are discernible in spite of the volume of artificially-inseminated sturgeon larva that have been released during the past 40 years.Keywords: geometric morphometric selection, phenotypic plasticity, discrimination, habitat. Uso de morfometría geométrica para la identificación de variaciones ecofenotípicas en juveniles de esturión persa Acipenser persicusResumen: El estudio de la variación fenotípica es esencial para la identificación de estirpes fenotípicas concretas. Con el fin de identificar diferencias morfológicas que permitan predecir variaciones eco-fenotípicas en el esturión persa, individuos inmaduros de esta especie se muestrearon en diferentes regiones del este y el oeste del sur del mar Caspio. Se utilizaron métodos morfométricos geométricos para cuantificar la forma del cuerpo. La configuración de coordenadas referenciadas del cuerpo del pez fueron escaladas, trasladadas y rotadas utilizando el análisis generalizado Procrustes, seguido del análisis Univariante de la Varianza de las coordenadas de forma resultantes, con el fin de evaluar posibles diferencias morfológicas entre diferentes zonas. Se utilizó un análisis de componentes principales para reducir el número de dimensiones sin perder información. Los scores de los componentes del cuerpo se sometieron a análisis discriminante, con el objeto de determinar la eficacia de las coordena...

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“…The pallid sturgeon (Scaphirhynchus albus Forbes and Richardson, 1905) is indigenous to large rivers of the central United States, primarily the Missouri and Mississippi river drainages (Lee et al 1980;Carlson et al 1985;Keenlyne et al 1994). Until it was recognized as a separate species, it was often mistakenly identified as a shovelnose sturgeon (Scaphirhynchus platorhynchus) in commercial fishery reports (Carlson et al 1985).…”

Section: Introductionmentioning

confidence: 99%

Sperm-cell ultrastructure of North American sturgeons. IV. The pallid sturgeon (<i>Scaphirhynchus albus</i> Forbes and Richardson, 1905)

DiLauro¹,

Walsh²,

Peiffer³

et al. 2001

Can. J. Zool.

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Sperm-cell morphology and ultrastructure in the pallid sturgeon (Scaphirhynchus albus) were examined using transmission and scanning electron microscopy. Metrics and structure were compared with similar metrics obtained from other published descriptions of sturgeon sperm cells. General morphology was found to be similar to that of sperm cells of the white (Acipenser transmontanus), lake (A. fulvescens), stellate (A. stellatus), Chinese (A. sinensis), Russian (A. gueldenstaedti colchicus), and shortnose (A. brevirostrum) sturgeons, which all shared a gradual tapering of the nuclear diameter from posterior to anterior, unlike that of the Atlantic sturgeon (A. oxyrhynchus). The sperm cell of the pallid sturgeon was similar in size to that of the Atlantic sturgeon, being only slightly larger. The sperm cell of the pallid sturgeon differed from those of other sturgeons chiefly in the acrosomal region, where the posterolateral projections (PLP) have the shape of an acute triangle and are arranged in a spiral about the longitudinal axis of the cell. The PLP were longer than those of other sturgeons, being twice the length of those of the Atlantic sturgeon and 58% longer than those of the lake sturgeon. Also, in cross section the acrosome had the shape of a hollow cone rather than the cap of an oak tree acorn, as was found in ultrastructural studies of other sturgeons. In addition, we were able to confirm that the structural arrangement of the distal centriole of the midpiece is identical with that of the proximal centriole: nine sets of microtubular triplets around the periphery of the centriole. This information is of potential use to fishery biologists, forensic biologists, zoologists, reproductive physiologists, taxonomists, evolutionary biologists, and aquaculturists.

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Morphometric Comparisons of Upper Missouri River Sturgeons

Cited by 34 publications

References 3 publications

Morphometric variation among river sturgeons (Scaphirhynchus spp.) of the Middle and Lower Mississippi River

Morphometric variation among river sturgeons (Scaphirhynchus spp.) of the Middle and Lower Mississippi River

Use of geometric morphometrics to identify ecophenotypic variation of juvenile Persian sturgeon <em>Acipenser persicus</em>

Sperm-cell ultrastructure of North American sturgeons. IV. The pallid sturgeon (<i>Scaphirhynchus albus</i> Forbes and Richardson, 1905)

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