干旱区生态环境知识资源中心(Arid): The physiology of Venezillo arizonicus: water balance and the cuticular water barrier

Arid

DOI	10.1016/j.jinsphys.2019.103991
	The physiology of Venezillo arizonicus: water balance and the cuticular water barrier
	Harris, Zechariah C.1; Taylor, Charles J.2; Wright, Jonathan C.1
通讯作者	Wright, Jonathan C.
来源期刊	JOURNAL OF INSECT PHYSIOLOGY
ISSN	0022-1910
EISSN	1879-1611
出版年	2020
卷号	120
英文摘要	This study investigated the water balance physiology of Venezillo arizonicus, a land isopod endemic to the Southwest Desert Ecoregion of North America. Evaporative water losses were measured in two ways: gravimetric in dry air, and by perfusing animals with dry air in a respirometry chamber and monitoring downstream relative humidity (RH). The respective mean loss flux estimates were 0.140 and 0.177 mu g h(-1) cm(-2) Pa-1, lower than other N. American Oniscidea described to date (>= 0.491 mu g h(-1) cm(-2) Pa-1). Humidity monitoring revealed intermittent sharp peaks in RH, attributed to the release of maxillary urine. Whole-animal flux increased as a function of temperature, with a critical temperature (T-c) between 38 and 42 degrees C identifiable by a clear Arrhenius break point. Hexane-rinsed whole animals yielded straight-chain, saturated hydrocarbons (C-21-C-33). The surface density of extracted alkanes (0.64 mu g cm(-2)) was somewhat higher than previously determined values for mesic species, although modest compared to insects and arachnids. Dehydrated animals exposed to high RH (> 88%) demonstrated active water vapor absorption (WVA) like other Crinocheta, with an extrapolated uptake threshold of approximately 85% RH (A(w) = 0.85), the lowest value reported for Oniscidea. The maximum uptake flux increased linearly as a function of ambient RH. Mass-specific uptake in 100% RH was 49% d(-1), similar to values determined previously for Armadillidium vulgare and Porcellio scaber. The low WVA threshold of V. arizonicus, and the species low permeability, are consistent with its known range in the arid desert southwest and the desiccation stress of its typical aeolian sand and seasonal wash habitats.
英文关键词	Desert isopod Water flux Cuticle Water vapor absorption
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000508490200012
WOS关键词	TERRESTRIAL ISOPODS CRUSTACEA ; PORCELLIO-SCABER CRUSTACEA ; PHYSICAL-PROPERTIES ; VAPOR ABSORPTION ; ONISCIDEA ; LIPIDS ; TEMPERATURE ; PERMEABILITY ; HYDROCARBONS ; MORPHOLOGY
WOS类目	Entomology ; Physiology ; Zoology
WOS研究方向	Entomology ; Physiology ; Zoology
EI主题词	2020-01-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312321
作者单位	1.Pomona Coll, Dept Biol, 175 West 6th St, Claremont, CA 91711 USA; 2.Pomona Coll, Dept Chem, 645 North Coll Ave, Claremont, CA 91711 USA
推荐引用方式 GB/T 7714	Harris, Zechariah C.,Taylor, Charles J.,Wright, Jonathan C.. The physiology of Venezillo arizonicus: water balance and the cuticular water barrier[J],2020,120.
APA	Harris, Zechariah C.,Taylor, Charles J.,&Wright, Jonathan C..(2020).The physiology of Venezillo arizonicus: water balance and the cuticular water barrier.JOURNAL OF INSECT PHYSIOLOGY,120.
MLA	Harris, Zechariah C.,et al."The physiology of Venezillo arizonicus: water balance and the cuticular water barrier".JOURNAL OF INSECT PHYSIOLOGY 120(2020).