For the conservation of endemic species,it is essential to obtain basic biological data.In this framework,the growth parameters of the fish Coptodon walteri from the Cavally River,an area under the effect of the Ity g...For the conservation of endemic species,it is essential to obtain basic biological data.In this framework,the growth parameters of the fish Coptodon walteri from the Cavally River,an area under the effect of the Ity gold mine in the southwestern part of Cote d’Ivoire,were analyzed.A total of 128 specimens were sampled between May and July 2021,including 72 from the Cavally SMI Hill South sector(CSH),located in the Ity mining area and 56 from the Bakatouo Camp sector(BC),outside the Ity mining area.Specimens were sampled using the standardized fishing method with monofilament gill nets(10,12,15,20 and 30 mm)mesh size.The equations p=aLS^(b)and K=100P/LS^(b)were used to determine the length-weight relationship and the condition coefficient.The allometric coefficient b of the length-weight relationship varied from 3.01 in the Cavally Colline Sud sector to 3.2 in the Bakatouo sector.Specimens from the Cavally Colline Sud sector exhibited isometric growth,while those from the Bakatouo sector displayed positive allometric growth.The average condition factor varied from 1.46±0.24 for the Bakatouo sector and 2.06±0.28 for the Cavally Colline Sud sector.The results obtained provide information on the living conditions of Coptodon walteri sampled at the two sites of the Cavally River.These results show the consequences of gold panning on the growth parameters of C.walteri living in this part of the river.展开更多
To acquire basic biological data on endemic species living in threatened hydrosystems,the morphological characteristics of the species Coptodon walteri from the Cavally River were evaluated in this study.Specimens of ...To acquire basic biological data on endemic species living in threatened hydrosystems,the morphological characteristics of the species Coptodon walteri from the Cavally River were evaluated in this study.Specimens of C.walteri were sampled at four stations(Niampleu,Bakatouo,Daapleu,and Floleu)located along the Cavally River from July 2023 to February 2024.A total of one hundred and twenty(120)specimens were sampled,with 30 individuals per station.The analysis using geometric morphometrics focused on sixteen(16)variables measured on each individual using landmarks(a system of reference points),via the software TpsDig and TpsUtil.The sixteen(16)measured parameters were subjected to four statistical analysis:one-way ANOVA,Principal Component Analysis(PCA),Ascending Hierarchical Clustering(AHC),and Discriminant Function Analysis(DFA).The one-way ANOVA test revealed 13 discriminating variables out of the 16 measured.The Principal Component Analysis,Ascending Hierarchical Clustering,and Discriminant Function Analysis structured the Coptodon walteri populations into two distinct groups.The first group consists of specimens from Niampleu,Bakatouo,and Floleu.The second contains only the individuals collected at Daapleu.The Discriminant Function Analysis revealed six variables that best discriminate the Coptodon walteri individuals:dorsal fin base length(LD),caudal peduncle depth(HPC),pelvic fin length(LPe),dorso-anal length(LDA),pre-dorsal fin length(LPrD),and pre-anal fin length(LPrA).This study concluded that there are two sub-groups within the Coptodon walteri specimens,which is likely attributable to the characteristics of the specimens’living environment.The preservation of this species appears feasible in light of its phenotypic variability.展开更多
文摘For the conservation of endemic species,it is essential to obtain basic biological data.In this framework,the growth parameters of the fish Coptodon walteri from the Cavally River,an area under the effect of the Ity gold mine in the southwestern part of Cote d’Ivoire,were analyzed.A total of 128 specimens were sampled between May and July 2021,including 72 from the Cavally SMI Hill South sector(CSH),located in the Ity mining area and 56 from the Bakatouo Camp sector(BC),outside the Ity mining area.Specimens were sampled using the standardized fishing method with monofilament gill nets(10,12,15,20 and 30 mm)mesh size.The equations p=aLS^(b)and K=100P/LS^(b)were used to determine the length-weight relationship and the condition coefficient.The allometric coefficient b of the length-weight relationship varied from 3.01 in the Cavally Colline Sud sector to 3.2 in the Bakatouo sector.Specimens from the Cavally Colline Sud sector exhibited isometric growth,while those from the Bakatouo sector displayed positive allometric growth.The average condition factor varied from 1.46±0.24 for the Bakatouo sector and 2.06±0.28 for the Cavally Colline Sud sector.The results obtained provide information on the living conditions of Coptodon walteri sampled at the two sites of the Cavally River.These results show the consequences of gold panning on the growth parameters of C.walteri living in this part of the river.
文摘To acquire basic biological data on endemic species living in threatened hydrosystems,the morphological characteristics of the species Coptodon walteri from the Cavally River were evaluated in this study.Specimens of C.walteri were sampled at four stations(Niampleu,Bakatouo,Daapleu,and Floleu)located along the Cavally River from July 2023 to February 2024.A total of one hundred and twenty(120)specimens were sampled,with 30 individuals per station.The analysis using geometric morphometrics focused on sixteen(16)variables measured on each individual using landmarks(a system of reference points),via the software TpsDig and TpsUtil.The sixteen(16)measured parameters were subjected to four statistical analysis:one-way ANOVA,Principal Component Analysis(PCA),Ascending Hierarchical Clustering(AHC),and Discriminant Function Analysis(DFA).The one-way ANOVA test revealed 13 discriminating variables out of the 16 measured.The Principal Component Analysis,Ascending Hierarchical Clustering,and Discriminant Function Analysis structured the Coptodon walteri populations into two distinct groups.The first group consists of specimens from Niampleu,Bakatouo,and Floleu.The second contains only the individuals collected at Daapleu.The Discriminant Function Analysis revealed six variables that best discriminate the Coptodon walteri individuals:dorsal fin base length(LD),caudal peduncle depth(HPC),pelvic fin length(LPe),dorso-anal length(LDA),pre-dorsal fin length(LPrD),and pre-anal fin length(LPrA).This study concluded that there are two sub-groups within the Coptodon walteri specimens,which is likely attributable to the characteristics of the specimens’living environment.The preservation of this species appears feasible in light of its phenotypic variability.
