Withers Philip C, Hedrick Michael S, Drewes Robert C, Hillman Stanley S
Animal Biology M092, University of Western Australia, Crawley, Western Australia 6009, Australia; 2Department of Biological Sciences, University of North Texas, Denton, Texas 76203; 3Department of Herpetology, California Academy of Sciences, San Francisco, California 94118; 4Department of Biology, Portland State University, Portland, Oregon 97207.
Physiol Biochem Zool. 2014 May-Jun;87(3):374-83. doi: 10.1086/676146. Epub 2014 Apr 15.
Dehydration tolerance of anuran amphibians is directly related to their ability to mobilize lymphatic reserves, with more terrestrial species having more effective lymph mobilization dependent on specialized skeletal muscles acting directly on the lymph sacs and via pulmonary ventilation. Consequently, we tested the hypothesis that pulmonary compliance, lung volume, and femoral lymphatic sac volume were related to terrestriality-and, hence, lymph mobilization-for 18 species of aquatic, semiaquatic, or terrestrial anuran amphibians. Lung compliance and volume were significantly related to body mass, but there was no significant phylogenetic pattern. There were significant habitat-related patterns for mass-corrected and phylogenetically corrected residuals for these pulmonary variables. Femoral lymph volume was significantly related to body mass, with no significant phylogenetic pattern, and there was only a weak correlation for habitat with mass-corrected and phylogenetically corrected residuals. These results suggest that pulmonary volume and compliance are strongly related to terrestriality in anuran amphibians and are under significant selection pressure to enhance lymph mobilization, but lymph sac volume does not appear to have a major role in adaptation to terrestriality.
无尾两栖动物的脱水耐受性与其调动淋巴储备的能力直接相关，更多陆生物种具有更有效的淋巴调动，这依赖于直接作用于淋巴囊以及通过肺通气的特殊骨骼肌。因此，我们检验了这样一个假设：对于18种水生、半水生或陆生无尾两栖动物而言，肺顺应性、肺容积和股淋巴囊容积与陆生程度相关，进而与淋巴调动相关。肺顺应性和容积与体重显著相关，但不存在显著的系统发育模式。这些肺变量经体重校正和系统发育校正后的残差存在与栖息地相关的显著模式。股淋巴容积与体重显著相关，不存在显著的系统发育模式，且在经体重校正和系统发育校正后的残差方面，与栖息地仅有微弱的相关性。这些结果表明，肺容积和顺应性与无尾两栖动物的陆生程度密切相关，并且在增强淋巴调动方面承受着显著的选择压力，但淋巴囊容积在适应陆生方面似乎并未发挥主要作用。
