Geographical continuity and discontinuity in the meristic characteristics of ayus of the southern subspecies Plecoglossus altivelis ryukyuensis

Ha, Linh Manh; Iguchi, Kei’ichiro

doi:10.1007/s10228-020-00766-2

Cited by 4 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our study confirmed the previous findings and detected a significant increase of some meristics with latitude. These results agree with the Jordan's rule [27,65,[93][94][95], an ecomorphological rule that postulates an inverse relationship between meristic traits and latitude (particularly temperature) in fish. Additionally, we found that individuals at lower latitudes displayed different coloration, supporting our second hypothesis for which morphological traits are related to current environmental conditions rather than past evolution and species attribution.…”

Section: Discussionsupporting

confidence: 88%

“…For the analysis of functional traits, 10 ratios of morphological measurements mainly associated with food acquisition and locomotion were taken into consideration [63] (Table 2 and Figure 2b). The knowledge of the relationship between functional morphology and environmental gradients allows for better predictions of the organisms' responses to environmental change [64,65].…”

Section: Morphological Datamentioning

confidence: 99%

See 1 more Smart Citation

Past and Present Environmental Factors Differentially Influence Genetic and Morphological Traits of Italian Barbels (Pisces: Cyprinidae)

Quadroni

Santis

Carosi

et al. 2023

Water

View full text Add to dashboard Cite

Local adaptation and phenotypic plasticity can lead to environment-related morphological and genetic variations in freshwater fish. Studying the responses of fish to environmental changes is crucial to understand their vulnerability to human-induced changes. Here, we used a latitudinal gradient as a proxy for past and present environmental factors and tested its influences on both genetic and morphological patterns. We selected as a suitable biogeographic model, the barbels, which inhabit 17 Adriatic basins of the central-southern Italian Peninsula, and explored association among attributes from genetic, morphological, and environmental analyses. The analysis of the mitochondrial DNA control region evidenced a southward significant increase in the number of private haplotypes, supporting the isolation of the southernmost populations related to the Mio-Pleistocene events. In contrast, morphology was mainly affected by changes in the present environmental conditions. Particularly, the number of scales and fish coloration were clearly associated to latitude, and thus thermal and hydrological conditions. Other morphometric and functional traits varied under the selective pressure of other environmental factors like elevation and distance from headwater. These results highlight the sensitivity of barbels to climate changes, which can serve as a basis for future eco-evolutionary and conservation studies.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Morphological Datamentioning

confidence: 99%

Past and Present Environmental Factors Differentially Influence Genetic and Morphological Traits of Italian Barbels (Pisces: Cyprinidae)

Quadroni

Santis

Carosi

et al. 2023

Water

View full text Add to dashboard Cite

show abstract

“…It should be noted that the I. rastrinoides specimens examined here from Areas A-C have higher numbers of dorsal-and anal-fin rays than those from Areas D-F. In addition, a north-south cline was apparent among the specimens from Areas D-F (Table 2), reflecting Jordan's rule (Jordan 1891;Ha and Iguchi 2021).…”

Section: Discussionmentioning

confidence: 61%

“…4). Such geographic variations, shown in Table 2, can be explained by the temperature-dependent development of fins (i.e., higher counts in lower temperatures) (e.g., Ha and Iguchi 2021). Although the early-life history of Icelus is largely unknown, an unidentified example of the genus was recorded from 50 m depth in April (Kojima 2014).…”

Section: Discussionmentioning

confidence: 99%

Redescription of <i>Icelus rastrinoides</i> Taranetz in Schmidt, 1935, a Senior Synonym of <i>Ricuzenius toyamensis</i> Matsubara and Iwai, 1951, with Notes on Geographic Variations (Teleostei: Cottidae)

et al. 2023

View full text Add to dashboard Cite

Ricuzenius toyamensis Matsubara and Iwai, 1951 was originally described on the basis of eight specimens collected from Toyama Bay, the Sea of Japan coast of central Honshu Island, Japan. The species has subsequently been considered as a valid species of the genus Icelus Krøyer, 1845, diagnosed by the following characters: supraocular and parietal spines absent; nuchal spine blunt and indistinct, covered with skin; uppermost preopercular spine unbranched; mid-sized scales scattered (not in rows) above and below lateral line; belly naked; minute ctenoid scales on upper part of maxillary; lateral line scales large, tubular, bearing spinules on dorsal and posterior margins; and lower jaw slightly protruding anteriorly. However, examination of the type specimens of Icelus rastrinoides Taranetz in Schmidt, 1935, a northern Sea of Japan species, showed them to be consistent with the holotype and paratypes of I. toyamensis. Accordingly, I. rastorinoides is regarded as a senior synonym of I. toyamensis, with the lectotype of the former being designated herein. The species is redescribed in detail on the basis of the types of both nominal species plus non-type specimens, with a note on geographic variations in dorsal-and anal-fin ray counts, which reflect Jordan's rule.

show abstract

Fluctuating asymmetry in the insular population of ayu, Plecoglossus altivelis ryukyuensis, estimating its genetic diversity at extinction

Oka

Iguchi

2021

Ichthyol Res

View full text Add to dashboard Cite

Geographical continuity and discontinuity in the meristic characteristics of ayus of the southern subspecies Plecoglossus altivelis ryukyuensis

Cited by 4 publications

References 13 publications

Past and Present Environmental Factors Differentially Influence Genetic and Morphological Traits of Italian Barbels (Pisces: Cyprinidae)

Past and Present Environmental Factors Differentially Influence Genetic and Morphological Traits of Italian Barbels (Pisces: Cyprinidae)

Redescription of <i>Icelus rastrinoides</i> Taranetz in Schmidt, 1935, a Senior Synonym of <i>Ricuzenius toyamensis</i> Matsubara and Iwai, 1951, with Notes on Geographic Variations (Teleostei: Cottidae)

Fluctuating asymmetry in the insular population of ayu, Plecoglossus altivelis ryukyuensis, estimating its genetic diversity at extinction

Contact Info

Product

Resources

About