Morphological Differences Between Male and Female Populations of Gymnocypris chilianensis

doi:10.11924/j.issn.1000-6850.casb2022-0084

Abstract

Abstract:

To identify the sex of Gymnocypris chilianensis quickly and exactly, this paper studied morphological information of 100 Gymnocypris chilianensis samples collected from Sulehe River in Gansu Province and established a discrimination model of male and female individuals. One-way analysis of variance (ANOVA), principal component analysis and R-cluster analysis were adopted. ANOVA revealed that there were significant differences in eight standardized characteristics (body height, body thickness, dorsal kiss distance, dorsal fin base length, head thickness, posterior head length, eye diameter, mouth fissure width) and body length and weight between male and female populations (P<0.05). Based on the analysis of the morphological index system by principal component analysis and R-cluster analysis, G. chilianensis was classified by body size. On the basis of the analysis, 15 characteristics were screened and the discriminate equations were built for classification of the 100 samples with an accuracy rate of 92%. Therefore, it is concluded that the female G. chilianensis collected from Sulehe River are superior to males in body height and body thickness, but have smaller interorbital diameter, oral fissure length and dorsal fin length. The findings can be used in sex identification of G. chilianensis and provide basic information for its reproduction.

Key words: Gymnocypris chilianensis, sex, morphological differences, discriminant analysis

ZHAO Zhongmeng, HUANG Zhipeng, ZHAO Han, ZHANG Lu, DUAN Yuanliang, MU Chengyan, ZHOU Jian, LI Qiang. Morphological Differences Between Male and Female Populations of Gymnocypris chilianensis[J]. Chinese Agricultural Science Bulletin, 2023, 39(5): 142-147.

Figures/Tables 7

References 25

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性别	数量/尾	体长范围/mm	体长均值±标准差/mm	体重范围/g	体重均值±标准差/g
雌	56	151.78~233.48	195.22±22.22^a	54.33~175.72	116.12±39.74^a
雄	44	121.68~191.93	145.65±16.07^b	26.34~90.87	40.96±15.02^b

性别	数量/尾	体长范围/mm	体长均值±标准差/mm	体重范围/g	体重均值±标准差/g
雌	56	151.78~233.48	195.22±22.22^a	54.33~175.72	116.12±39.74^a
雄	44	121.68~191.93	145.65±16.07^b	26.34~90.87	40.96±15.02^b

性状		雌				雄				方差齐性检验		单因素方差分析
性状		M±SD		CV/%		M±SD		CV/%		Sig.		F		df		Sig.
体高/体长		0.2100±0.01		7.12		0.1989±0.02		8.40		0.440		11.849		99		0.001 **
体厚/体长		0.1589±0.01		8.57		0.1412±0.02		10.72		0.651		36.833		99		0.000 **
尾柄长/体长		0.1533±0.01		10.90		0.1638±0.02		10.57		0.861		2.454		99		0.120
尾柄高/体长		0.0716±0.00		6.83		0.0722±0.00		6.38		0.967		0.489		99		0.486
背吻距/体长		0.5099±0.05		10.65		0.4844±0.02		3.66		0.276		9.812		99		0.002 **
背尾距/体长		0.3952±0.04		10.29		0.4070±0.05		13.42		0.024		1.470		99		0.228
背鳍基长/体长		0.1131±0.05		49.90		0.1390±0.02		14.67		0.671		9.101		99		0.003 **
头高/头长		0.6078±0.05		7.51		0.6325±0.24		38.20		0.204		0.492		99		0.485
头厚/头长		0.5996±0.05		8.50		0.5466±0.04		7.58		0.243		31.958		99		0.000 **
吻长/头长		0.2951±0.02		7.68		0.2971±0.02		7.65		0.850		0.188		99		0.666
眼后头长/头长		0.5172±0.03		5.44		0.4882±0.03		6.59		0.514		22.635		99		0.000 **
眼径/头长		0.1968±0.02		7.75		0.2222±0.02		8.60		0.127		53.258		99		0.000 **
眼间距/头长		0.4034±0.02		11.10		0.3879±0.05		12.45		0.302		2.715		99		0.103
性状	雌				雄				方差齐性检验		单因素方差分析
性状	M±SD		CV/%		M±SD		CV/%		Sig.		F		df		Sig.
口裂宽/头长	0.3338±0.03		8.40		0.3182±0.03		8.53		0.640		7.789		99		0.006**
口裂长/头长	0.2673±0.02		9.30		0.2676±0.02		8.86		0.699		0.005		99		0.946
鼻孔间距/头长	0.1787±0.02		12.14		0.1768±0.02		10.21		0.265		0.231		99		0.632

性状		雌				雄				方差齐性检验		单因素方差分析
性状		M±SD		CV/%		M±SD		CV/%		Sig.		F		df		Sig.
体高/体长		0.2100±0.01		7.12		0.1989±0.02		8.40		0.440		11.849		99		0.001 **
体厚/体长		0.1589±0.01		8.57		0.1412±0.02		10.72		0.651		36.833		99		0.000 **
尾柄长/体长		0.1533±0.01		10.90		0.1638±0.02		10.57		0.861		2.454		99		0.120
尾柄高/体长		0.0716±0.00		6.83		0.0722±0.00		6.38		0.967		0.489		99		0.486
背吻距/体长		0.5099±0.05		10.65		0.4844±0.02		3.66		0.276		9.812		99		0.002 **
背尾距/体长		0.3952±0.04		10.29		0.4070±0.05		13.42		0.024		1.470		99		0.228
背鳍基长/体长		0.1131±0.05		49.90		0.1390±0.02		14.67		0.671		9.101		99		0.003 **
头高/头长		0.6078±0.05		7.51		0.6325±0.24		38.20		0.204		0.492		99		0.485
头厚/头长		0.5996±0.05		8.50		0.5466±0.04		7.58		0.243		31.958		99		0.000 **
吻长/头长		0.2951±0.02		7.68		0.2971±0.02		7.65		0.850		0.188		99		0.666
眼后头长/头长		0.5172±0.03		5.44		0.4882±0.03		6.59		0.514		22.635		99		0.000 **
眼径/头长		0.1968±0.02		7.75		0.2222±0.02		8.60		0.127		53.258		99		0.000 **
眼间距/头长		0.4034±0.02		11.10		0.3879±0.05		12.45		0.302		2.715		99		0.103
性状	雌				雄				方差齐性检验		单因素方差分析
性状	M±SD		CV/%		M±SD		CV/%		Sig.		F		df		Sig.
口裂宽/头长	0.3338±0.03		8.40		0.3182±0.03		8.53		0.640		7.789		99		0.006**
口裂长/头长	0.2673±0.02		9.30		0.2676±0.02		8.86		0.699		0.005		99		0.946
鼻孔间距/头长	0.1787±0.02		12.14		0.1768±0.02		10.21		0.265		0.231		99		0.632

性状	主成分
性状	1	2	3	4	5	6
体高/体长	0.17	0.01	-0.13	0.30	0.26	0.07
体厚/体长	0.17	-0.07	-0.18	0.31	0.01	0.17
尾柄长/体长	0.08	0.18	0.01	-0.35	0.22	-0.34
尾柄高/体长	0.09	0.10	-0.06	0.16	0.53	0.01
背吻距/体长	0.11	-0.21	0.30	0.21	-0.10	-0.27
背尾距/体长	-0.11	-0.13	0.21	0.02	0.46	0.22
背鳍基长/体长	-0.15	0.15	-0.29	-0.09	0.05	0.36
头高/头长	0.01	0.18	0.05	0.25	-0.19	-0.10
头厚/头长	0.20	-0.06	-0.09	-0.10	-0.01	0.06
吻长/头长	0.06	0.09	0.40	-0.15	0.11	0.33
眼后头长/头长	-0.01	-0.31	-0.22	-0.13	0.00	0.10
眼径/头长	-0.12	0.24	0.15	0.25	0.02	-0.01
眼间距/头长	0.18	0.16	-0.40	-0.15	-0.07	-0.22
口裂宽/头长	0.13	-0.08	0.20	-0.16	-0.14	0.45
口裂长/头长	0.08	0.20	-0.01	0.15	-0.27	0.38
鼻孔间距/头长	0.12	0.11	-0.04	-0.29	0.04	0.12
特征值	4.02	2.42	1.78	1.40	1.30	1.05
贡献率/%	25.11	15.14	11.13	8.76	8.14	6.58
累积贡献率/%	25.11	40.25	51.38	60.14	68.28	74.86