Cephalic Lateral-line Systems and Geographical Distribution in the Genus Tribolodon(Cyprinidae)
Cephalic Lateral-line Systems and Geographical Distribution in the Genus Tribolodon(Cyprinidae)
复制标题
三齿鱼属头侧线系统及地理分布
DOI：
10.11369/jji1950.24.167
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
K. Kurawaka
中科院分区：
文献类型：
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作者：
K. Kurawaka
头侧系是三角齿龙属各物种的有效诊断特征。当管孔数被认为是与存在或不存在连接之间的孔口前下颌管（POM）和臼后关节（POC），这些被分为三种模式，即：1)孔隙数量较少且POM与POC之间不存在连接；2)孔隙数量较多且POM与POC之间不存在连接；3)孔隙数量较多且POM与POC之间存在连接。在日本的地理范围内，该物种的地理分布和栖息地的差异也观察到三种模式，即：，1)三角齿龙的整个分布范围和栖息地，2)局限于范围的北半部，3)局限于有限的区域，如Ukekuchi-ugui。三角齿龙各物种之间的关系和上述模式似乎表明，每个物种的物种特异性可以通过与环境因素的某种协调模式来分类，而环境因素本身或多或少是所有属物种共有的。侧线系统的特性经常被用来评价许多鱼类的系统关系。然而，正如Hybopsis （Reno,1969）所显示的那样，尽管这些特征相对稳定，并为其他Hybopsis类群的系统发育关系提供了有用的指示，但在Hybopsis属的某些类群中，感觉管道系统的某些方面是可塑的，并且对环境影响敏感。Reno（1969）认为，hypbopsis侧线系统的这些模棱两可的方面部分归因于对将他研究中所检查的所有带刺小鱼作为材料的有效性的怀疑。头侧侧线系统也是Tribolodon用于识别每个物种的有效工具（Nakamura,1963,1969；Onodera和Honma，1976），但Tribolodon的这一特征似乎表现出了在低opsis中所看到的模棱两可的方面。为了澄清这一特征的模糊性，对四种三角齿龙的头侧线系统进行了分析，认为这是基于两个因素组合的模式。管孔数量的减少或增加，以及管前下颌骨管（POM）与管后关节（POC）之间的连接是否存在。结果发现了三种不同的分布模式，并将其与Tribolodon属物种的地理分布差异组合模式进行了比较。最后，讨论了侧线系统特征所代表的每个物种的物种特异性。
Cephalic lateral-line systems are effective diagnostic characters for each species in the genus Tribolodon.When canal pore numbers are considered in relation to the presence or absence of the connection between the preoperculomandibular canal(POM)and the postocular commisure(POC),these are grouped into three patterns,i.e.,1)lower number of pores and absence of the connection between POM and POC,2)higher number of pores and absence of the connection between POM and POC,and 3)higher number of pores and presence of the connection between POM and POC.Three patterns are also observed concerning differences in the geographical distribution and habitats of the species within its geographical range in Japan,i.e.,1)the entire range of distribution and habitats of Tribolodon,2)restricted to the northern half of the range,and 3)restricted to a limited area , as in Ukekuchi-ugui. Relationships of each species of Tribolodon and these patterns described above seem to indicate that the species-specificity of each species can be categorized by a certain pattern of coordination to the environmental factors,which themselves are,more or less,shared in common by all species of the genus. Characteristics of the lateral-line system have been used frequently in evaluating the systematic relationship of many fishes.As shown in Hybopsis (Reno,1969),however,a certain aspect of sensory canal systems is plastic and responsive to environmental infi uences in some groups of the genus Hybopsis, although these characters are relatively stable and provide a useful indication of phylogenetic relationships in other groups of Hybopsis. Reno(1969)suggested that these ambiguous aspects of lateral-line systems in Hybopsis are attributed partly to the doubt about the validity of lumping together all of barbeled minnows examined as materials in his study. The cephalic lateral-line system is also an effective tool used to identify each species in Tribolodon(Nakamura,1963,1969;Onodera and Honma,1976),but this character in Tribolodon seems to show the ambiguous aspect as seen in Hybopsis.To clarify the ambiguous aspect of the character,cephalic lateral-line systems of four species of Tribolodon were analized as the patterns based on combinations of two factors,i.e.,lower or higher number of canal pores and the presence or absence of the connection between the preoperculomandibular canal(POM)and the postocular commisure (POC).As results,three patterns were recognized,and then,these patterns were compared with the patterns observed on combinations of differences in the geographical distribution and those of habitats of species in the genus Tribolodon.Finally,a discussion on what is the species-specificity of each species represented by characteristics of lateral-line systems was attempted.