Functional morphology of extreme jaw protrusion in Neotropical cichlids
Functional morphology of extreme jaw protrusion in Neotropical cichlids
复制标题
新热带丽鱼科极端下颌突出的功能形态
DOI：
10.1002/jmor.10111
复制
发表时间：
2003
影响因子：
1.5
通讯作者：
P. Wainwright
中科院分区：
文献类型：
--
作者：
T. Waltzek;P. Wainwright
新世界丽鱼科鱼 Petenia splendida 和 Caquetaia spp.拥有异常突出的下巴。我们通过比较摄食运动学、颅骨形态和摄食性能，研究了极端（此处定义为头长大于 30%）和适度下颌突出的新热带慈鲷的摄食行为。分析了 P. splendida、C. spectabile 和 Astronotus ocellatus 捕食活孔雀鱼猎物的数字高速视频（500 fps），以生成运动学和性能变量。在摄食实验中，所有三种丽鱼类群都利用颅骨抬高、下颌凹陷和悬索的旋转来突出颌部。 P. splendida 和 C. spectable 的前颌极度前突是由于下颌凹陷增大和悬索前旋所致。八种慈鲷的形态学比较揭示了 P. splendida 和 Caquetaia spp 的悬索内新的前部和后部屈曲点。 P. splendida 和 Caquetaia spp. 悬索内前后松动的结合。允许悬索相当大的前旋并有助于颌骨突出。 Petenia splendida 和 C. spectabile 比 A. ocellatus 表现出更大的公羊距离和更高的公羊速度，这主要是由于下巴突出增加所致。 Petenia splendida 和 C. spectable 表现出比 A. ocellatus 更低的吸食性能，这通过吸力引起的猎物运动和速度较低而表明。因此，这些慈鲷的下颌极度突出可能代表了通过提高捕食者的冲撞速度来捕获难以捉摸的猎物的适应，但并没有增强吸食性能。 J.莫菲尔。 257:96–106, 2003。© 2003 Wiley‐Liss, Inc.
The New World cichlids Petenia splendida and Caquetaia spp. possess extraordinarily protrusible jaws. We investigated the feeding behavior of extreme (here defined as greater than 30% head length) and modest jaw‐protruding Neotropical cichlids by comparing feeding kinematics, cranial morphology, and feeding performance. Digital high‐speed video (500 fps) of P. splendida, C. spectabile, and Astronotus ocellatus feeding on live guppy prey was analyzed to generate kinematic and performance variables. All three cichlid taxa utilized cranial elevation, lower jaw depression, and rotation of the suspensorium to protrude the jaws during feeding experiments. Extreme anterior jaw protrusion in P. splendida and C. spectabile resulted from augmented lower jaw depression and anterior rotation of the suspensorium. Morphological comparisons among eight cichlid species revealed novel anterior and posterior points of flexion within the suspensorium of P. splendida and Caquetaia spp. The combination of anterior and posterior loosening within the suspensorium in P. splendida and Caquetaia spp. permitted considerable anterior rotation of the suspensorium and contributed to protrusion of the jaws. Petenia splendida and C. spectabile exhibited greater ram distance and higher ram velocities than did A. ocellatus, resulting primarily from increased jaw protrusion. Petenia splendida and C. spectabile exhibited lower suction feeding performance than A. ocellatus, as indicated by lower suction‐induced prey movements and velocities. Thus, extreme jaw protrusion in these cichlids may represent an adaptation for capturing elusive prey by enhancing the ram velocity of the predator but does not enhance suction feeding performance. J. Morphol. 257:96–106, 2003. © 2003 Wiley‐Liss, Inc.