...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Insulative capacity of the integument of the dugong (Dugong dugon): thermal conductivity, conductance and resistance measured by in vitro heat flux
【24h】

Insulative capacity of the integument of the dugong (Dugong dugon): thermal conductivity, conductance and resistance measured by in vitro heat flux

机译：儒艮（Dugong dugon）被膜的绝缘能力：通过体外热通量测得的热导率，电导率和电阻

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Extant sirenians are restricted to warm waters, presumably due to their low metabolism and poor ther-moregulatory capacity, including thin blubber. When subjected to winter waters, Florida manatees (Trichechus mana-tus latirostris) migrate to warm areas, but dugongs (Dugong dugon) do not and instead live year-round in winter waters as cool as 15-18 ℃. Dugongs appear to be more active than manatees and may have higher metabolic rates, but little is known about thermal energetics or the insulative properties of their integument. This study investigated the physical and thermal properties of whole samples of dugong integument, i.e. epidermis, dermis and hypodermis (blubber) sampled from fresh dugong carcasses collected from 2004 to 2012 in Moreton Bay (27.21°S, 153.25°E). Physico-chemical properties (thickness, density and lipid content) of each component tissue layer were measured. Thermal conductance (Q and conductivity (k) were measured for each tissue layer through in vitro temperature flux experiments within an insulated chamber. C and k were higher for dermis (25.7 ± 1.2 W m~(-2) K~(-1), 0.43 ± 0.02 W m~(-1) K~(-1), respectively, n = 21) than blubber (24.3 ± 2.4 W m~(-2) K~(-1), 0.31 ± 0.01 W m~(-1) K~(-1), n = 21), suggesting that blubber, with higher density and lipid content, affords better insulation. However, because the dermis contributes 65 % of integumentary thickness, both layers contribute significantly to insulation. The integument of dugongs is a poorer insulator compared to many cold-water marine mammals, but the greater thickness of its dermal layer means that despite its relatively thin blubber, its integumentary insulation is similar to warm-water dolphins of similar body size.
机译：现存的警报器仅限于温水，这可能是由于它们的新陈代谢低和热调节能力差，包括稀薄的脂肪。佛罗里达州的海牛（Trichechus mana-tus latirostris）在冬季水域中会迁移到温暖的地区，但儒艮（Dugong dugon）则不会，而是常年在15-18℃的冬季水域中生活。儒艮似乎比海牛更活跃，可能具有更高的新陈代谢率，但对热能学或其外皮的绝缘特性知之甚少。这项研究调查了从2004年至2012年在摩顿湾（27.21°S，153.25°E）采集的新鲜儒艮cas体抽取的儒艮皮的整个样品的物理和热学性质，即表皮，真皮和皮下组织（脂肪）。测量每个组成组织层的理化性质（厚度，密度和脂质含量）。通过在绝缘室内进行体外温度通量实验，测量每个组织层的导热系数（Q和导热系数（k）），真皮的C和k值较高（25.7±1.2 W m〜（-2）K〜（-1）分别比润滑脂（24.3±2.4 W m〜（-2）K〜（-1），0.31±0.01 W m〜分别为0.43±0.02 W m〜（-1）K〜（-1），n = 21）。 （-1）K〜（-1），n = 21），表明具有较高密度和脂质含量的润滑脂具有较好的隔热性，但由于真皮占外皮厚度的65％，因此两层均显着促进了隔热性。与许多冷水海洋哺乳动物相比，儒艮的外皮是较差的绝缘体，但是其真皮层的厚度较大意味着尽管其脂肪相对较薄，但其外皮的隔热性却与类似体型的温水海豚相似。

著录项

  • 来源
    《Marine biology》 |2014年第6期|1395-1407|共13页
  • 作者

    Patrick Horgan; David Booth; Cassandra Nichols; Janet M. Lanyon;

  • 作者单位

    School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia;

    School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia;

    School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia,Earthwatch Australia, 126 Bank St, South Melbourne, VIC 3205, Australia;

    School of Biological Sciences, The University of Queensland, St Lucia, QLD 4072, Australia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号