scholarly journals Erratum: Allometric analysis of a morphological anti-predator trait in geographic populations of Japanese crucian carp

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Sakie Kodama ◽  
Hiroka Fujimori ◽  
Hiroshi Hakoyama
Keyword(s):  
Crucian Carp ◽  
Geographic Populations ◽  
Allometric Analysis

scholarly journals Allometric analysis of a morphological anti-predator trait in geographic populations of Japanese crucian carp

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Sakie Kodama ◽  
Hiroka Fujimori ◽  
Hiroshi Hakoyama
Keyword(s):  
Crucian Carp ◽  
Major Axis ◽  
Body Depth ◽  
Piscivorous Fish ◽  
Local Selection ◽  
Gape Size ◽  
Allometric Relation ◽  
Geographic Populations ◽  
The Mean ◽  
Allometric Analysis

Abstract Costly anti-predator traits tend to be expressed only in high-predation conditions. For the cyprinid fish genus Carassius, deeper body depth is more adaptive to avoid predation by gape-limited piscivorous fish, but it raises swimming costs. It is therefore predicted that the relative body depth will decrease when the prey fish has reached a size larger than the predator gape-size. This prediction was tested by allometric analysis of the relation between body depth and standard length of triploid asexual females of the Japanese crucian carp (Carassius auratus sspp.) sampled from 13 geographic populations. The overall allometric relation was not significantly different from isometry. The estimate of the common major-axis slope was close to 1 (near-isometry). The mean relative body depth differed significantly among populations. A significant positive correlation was found with the mean annual air temperature. The geographic variation suggests that local selection pressures vary. In conclusion, the hypothesis that larger fish will have lower body depth was not supported, perhaps indicating that deep body depth in large fish is adaptive for some reason other than defense against piscivorous fish.

Structure and Dynamics of Crucians’ Settlements (Cypriniformes, Carassius) in Water Systems of Eastern Ukraine

2019 ◽  
Vol 53 (4) ◽  
pp. 269-284
Author(s):  
S. V. Mezhzherin ◽  
A. V. Kulish ◽  
S. V. Kokodiy
Keyword(s):  
Species Composition ◽  
Retrospective Analysis ◽  
Crucian Carp ◽  
Water Systems ◽  
Museum Collections ◽  
Numerous Species ◽  
Extinct Species ◽  
Structure And Dynamics ◽  
Competitive Relations

Abstract The analysis of present-day crucians’ settlements in water systems of Eastern Ukraine designated the predominance of the digeneous Goldfish, C. auratus, in the region, the number of which made 78.7 %, from the total number of the examined representatives of the genus. The second group consists of gynogenetic Prussian carps, C. gibelio (14.3 %); it is represented by the clone biotype and recombinant individuals. Crucian carp, C. carassius (3.6 %), turned out to be rare and its number did not exceed the number of the caught hybrids C. auratus × C. carassius (3.4 %). The retrospective analysis of literature data and museum collections gave an opportunity to describe the changes in species composition of the genus which took place during the last 150 years. Within this period the crucian carp, which used to be the single and most common representative of genus Carassius (Jarocki, 1822) in the region, became nearly an extinct species. In the meanwhile the representatives of the group of species of Prussian carps, C. auratus + C. gibelio, which appeared in the region in the late 1960s, rapidly increased their number and became the most numerous fish of the Eastern Ukraine. The discovered tendency is not unique for the researched region; in general it reflects the European tendency for the crucian species. The reasons for that are rivers’ regulation and destruction of bottomland ecosystems. The secondary factors for the elimination of C. carassius are the competitive relations of individuals representing both species and easy hybridization, during which the more numerous species C. auratus absorbs the rare C. carassius.

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