Observations on the Reproductive Biology of Two Notropis Shiner Species

Stallsmith, Bruce; Butler, Kevin A.; Woodall, A. N.; Muller, Bob

doi:10.1656/1528-7092(2007)6[693:ootrbo]2.0.co;2

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Stage I oocyte proportions suggest a peak in spawning condition mid‐May to early‐June as well, with the proportion of stage I oocytes declining through the summer to a minimum on June 1, then increasing in the final two samples. Other studies have also observed increased proportions of late stage oocytes as the spawning season progresses, with a corresponding decline in early stage oocytes (Brewer et al, ; Flores et al, ; Piñón et al, ; Stallsmith, Butler, Woodall, & Muller, ). Since stage I and IV oocytes were prevalent in high numbers as opposed to stage II and III oocytes, trends in the progression of oocytes to tertiary vitellogenesis was not clear.…”

Section: Discussionmentioning

confidence: 90%

Morphological and gonadal assessments from historical collections of Bluenose Shiners Pteronotropis welaka

Fetterman

Green

2019

J Appl Ichthyol

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Management and conservation have begun to rely on supplemental information to make appropriate decisions. In organisms with little available information, preserved specimens may be particularly important for researchers to continue their role in the management process. Bluenose Shiners are a minnow species that can benefit from such analyses as they are of conservation concern across their native range in the Southeastern United States. To supplement conservation, the objectives were to: (a) quantify sexual dimorphism through a comprehensive morphological analysis, (b) approximate peak spawning condition of males and females through GSI measurements over the anticipated spawning season, and (c) utilize female gonad histology to refine conclusions regarding spawning condition from GSI. Historical collections of Bluenose Shiners obtained from the Tulane University Biodiversity Research Institute were used to conduct morphological and gonadal analyses. While males expressed all morphometrics to a greater degree, male dorsal and anal fin length appears to be the most distinguished characteristic beginning at a total length of approximately 45 mm. GSI displayed peaks in the samples from April 21, 1957 and June 1, 1968; female GSI from Black Creek, MS in April, May, and June of 1986 suggested a peak in late May. Gonad histology showed a progression towards final oocyte maturation through May to early June, via relative prevalence of stage IV and absence of stage I oocytes. This information can be used to supplement future morphometric analyses and reproductive studies performed on Bluenose Shiners or other fish species.

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Section: Discussionmentioning

confidence: 90%

Morphological and gonadal assessments from historical collections of Bluenose Shiners Pteronotropis welaka

Fetterman

Green

2019

J Appl Ichthyol

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“…Sexual dimorphism is common in minnows, including many members of the genus Notropis. This includes differences in coloration (Harrington, 1947), tuberculation (Snelson, 1968) and sexual size differences (Holder & Powers, 2010;Holmes et al, 2010;Jolly & Powers, 2008;Stallsmith et al, 2007). It is possible that the greater divergence in the shape observed in the breeding males and the isolation of the lineages could lead to reproductive isolation and speciation within the group.…”

Section: Sexual Dimorphismmentioning

confidence: 99%

Morphological diversity within the Ozark minnow (Notropis nubilus: Leuciscidae)

Berendzen

Holmes

Abels

et al. 2021

Journal of Fish Biology

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The Ozark minnow, Notropis nubilus, is a small stream fish that has a disjunct distribution in the Ozark Plateau and upper Mississippi River basin. Three reciprocally monophyletic and deeply divergent lineages have been hypothesized within the species based on molecular data. These lineages are allopatric and isolated from each other.The objective of this study was to test the hypothesis that these lineages and the disjunct population in the upper Mississippi River basin are morphologically distinct.Meristic and geometric morphometric data were used to identify and quantify morphological diversity within the Ozark minnow. Analyses of the meristic data and a principal component analysis of the morphometric data were unable to find any noticeable differences in morphology among groups. However, canonical variates analyses of the morphometric data and linear models were able to define statistically significant differences in shape. Analyses of all-individuals were able to identify shape differences between all groups. Males-only analyses were less conclusive, but there was some indication that males may be diverging more quickly than all-individuals.The detection of subtle variation in shape implies selection is not a strong factor in morphological divergence and observed differences are most likely due to morphological drift. This indicates that the lineages within the Ozark minnow are likely on the trajectory for speciation. The allopatric nature of these clades makes the Ozark minnow an interesting model for the study of morphological drift and speciation.

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