Azad Kamrun Naher, Sarower-E-Mahfuj Md, Iqbal Towsif, Azad Khairun Naher, Shafaq Md Arif Imtiaz
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh, Bangladesh.
Department of Fisheries and Marine Bioscience, Jashore University of Science and Technology, Jashore, Bangladesh.
J Adv Vet Anim Res. 2020 Oct 1;7(4):585-596. doi: 10.5455/javar.2020.g456. eCollection 2020 Dec.
Understanding intraspecific phenotypic plasticity is a prerequisite to fish stock identification and sustainable fisheries management. In this study, we assessed intraspecific phenotypic plasticity in terms of meristic and morphometric characters of wild populations of elongate glassy perchlet, from two different rivers, namely Madhumati River - Narail (MRN) and Tulshiganga River - Jaypurhat (TRJ), and an ox-bow lake, - Jashore (JBJ) in Bangladesh.
In this study, six meristics, 15 conventional morphometrics, and 23-truss-based morphometrics were subjected to a one-way analysis of variance (ANOVA), followed by the Tukey-HSD test. The mean values of three meristic counts and nine conventional and 12 truss-based morphometrics demonstrated significant differences in the ANOVA test. Furthermore, principal component analysis (PCA) and discrimination function analysis (DFA) were performed separately using conventional and truss-based morphometric data.
In PCA analysis, four principal components were extracted and cumulatively demonstrated 51.848%. On the contrary, two discriminant functions (DF1, 63.5%; DF2, 36.5%) resulted from DFA analysis. In the bi-plot alignment from the discriminant space, all individuals were exceedingly separated among the three inhabitants. A dendrogram developed using conventional and truss morphometric characters confirmed that two clusters were formed among three populations. The TRJ population formed a distinct cluster, and the JBJ population formed a different cluster with a subcluster of MRN. In the discriminant function analysis, precise classification outcomes displayed 82% of individuals into their unique populations, whereas 66.9% of individuals were categorized as a cross-validated assemblage.
The baseline information resulting from the current study would be useful for environmental studies and further conservation of glassy perchlet populations in Bangladesh.
了解种内表型可塑性是鱼类种群识别和可持续渔业管理的先决条件。在本研究中，我们根据细长玻璃鲈野生种群的可数性状和形态测量特征，评估了种内表型可塑性。这些野生种群来自孟加拉国的两条不同河流，即马杜马蒂河 - 纳拉尔（MRN）和图尔希甘加河 - 贾普尔哈特（TRJ），以及一个牛轭湖 - 贾索尔（JBJ）。
在本研究中，对六个可数性状、15个常规形态测量指标和23个基于框架的形态测量指标进行了单因素方差分析（ANOVA），随后进行了Tukey-HSD检验。在ANOVA检验中，三个可数性状计数以及九个常规和12个基于框架的形态测量指标的平均值显示出显著差异。此外，分别使用常规和基于框架的形态测量数据进行了主成分分析（PCA）和判别函数分析（DFA）。
在PCA分析中，提取了四个主成分，累积贡献率为51.848%。相反，DFA分析产生了两个判别函数（DF1，63.5%；DF2，36.5%）。在判别空间的双标图排列中，所有个体在三个种群之间都有明显的区分。使用常规和框架形态测量特征绘制的树状图证实，三个种群中形成了两个聚类。TRJ种群形成了一个独特的聚类，JBJ种群形成了一个不同的聚类，其中MRN有一个子聚类。在判别函数分析中，精确的分类结果显示82%的个体被正确分类到其所属种群，而66.9%的个体被归类为交叉验证组合。
本研究得出的基线信息将有助于孟加拉国的环境研究和玻璃鲈种群的进一步保护。
