Lukanov Simeon, Tzankov Nikolay, Handschuh Stephan, Heiss Egon, Naumov Borislav, Natchev Nikolay
Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, blvd. Tzar Osvoboditel 1, 1000 Sofia, Bulgaria.
Section Vertebrates, National Museum of Natural History, Bulgarian Academy of Sciences, Tzar Osvoboditel 1, 1000 Sofia, Bulgaria.
Zoology (Jena). 2016 Jun;119(3):224-231. doi: 10.1016/j.zool.2016.02.002. Epub 2016 Mar 5.
Feeding behavior in salamanders undergoing seasonal habitat shifts poses substantial challenges caused by differences in the physical properties of air and water. Adapting to these specific environments, urodelans use suction feeding predominantly under water as opposed to lingual food prehension on land. This study aims to determine the functionality of aquatic and terrestrial feeding behavior in the Balkan-Anatolian crested newt (Triturus ivanbureschi) in its terrestrial stage. During the terrestrial stage, these newts feed frequently in water where they use hydrodynamic mechanisms for prey capture. On land, prey apprehension is accomplished mainly by lingual prehension, while jaw prehension seems to be the exception (16.67%) in all terrestrial prey capture events. In jaw prehension events there was no detectable depression of the hyo-lingual complex. The success of terrestrial prey capture was significantly higher when T. ivanbureschi used lingual prehension. In addition to prey capture, we studied the mechanisms involved in the subduction of prey. In both media, the newts frequently used a shaking behavior to immobilize the captured earthworms. Apparently, prey shaking constitutes a significant element in the feeding behavior of T. ivanbureschi. Prey immobilization was applied more frequently during underwater feeding, which necessitates a discussion of the influence of the feeding media on food manipulation. We also investigated the osteology of the cranio-cervical complex in T. ivanbureschi to compare it to that of the predominantly terrestrial salamandrid Salamandra salamandra.
经历季节性栖息地转移的蝾螈的摄食行为，因空气和水的物理特性差异而面临重大挑战。为适应这些特定环境，有尾目动物在水下主要采用吸食式摄食，而在陆地上则采用舌部抓取食物。本研究旨在确定巴尔干 - 安纳托利亚冠螈（Triturus ivanbureschi）陆地阶段水生和陆生摄食行为的功能。在陆地阶段，这些蝾螈经常在水中觅食，它们利用流体动力学机制捕捉猎物。在陆地上，猎物的抓取主要通过舌部抓取完成，而在所有陆地猎物捕捉事件中，颌部抓取似乎是个例外（占16.67%）。在颌部抓取事件中，未检测到舌 - 舌骨复合体的下压。当T. ivanbureschi采用舌部抓取时，陆地猎物捕捉的成功率显著更高。除了猎物捕捉，我们还研究了猎物吞咽过程中涉及的机制。在两种介质中，蝾螈都频繁使用摇晃行为来固定捕获的蚯蚓。显然，猎物摇晃是T. ivanbureschi摄食行为的一个重要元素。在水下摄食时，猎物固定行为的应用更为频繁，这需要讨论摄食介质对食物操控的影响。我们还研究了T. ivanbureschi颅 - 颈复合体的骨学，以便与主要生活在陆地的蝾螈科动物火蝾螈（Salamandra salamandra）进行比较。
