Abstract:
:Physiological performance and tolerance limits in metazoans have been widely studied and have informed our understanding of processes such as extreme heat and cold tolerance, and resistance to water loss. Because of scaling considerations, very small arthropods with extreme microclimatic niches provide promising extremophiles for testing predictive physiological models. Corollaries of small size include rapid heating and cooling (small thermal time constants) and high mass-specific metabolic and water exchange rates. This study examined thermal tolerance and water loss in the erythracarid mite Paratarsotomus macropalpis (Banks, 1916), a species that forages on the ground surface of the coastal sage scrub habitat of Southern California, USA. Unlike most surface-active diurnal arthropods, P. macropalpis remains active during the hottest parts of the day in midsummer. We measured water-loss gravimetrically and estimated the critical thermal maximum (CTmax) by exposing animals to a given temperature for 1h and then increasing temperature sequentially. The standardized water flux of 4.4ngh(-1)cm(-2)Pa(-1), averaged for temperatures between 22 and 40°C, is among the lowest values reported in the literature. The CTmax of 59.4°C is, to our knowledge, the highest metazoan value reported for chronic (1-h) exposure, and closely matches maximum field substrate temperatures during animal activity. The extraordinary physiological performance seen in P. macropalpis likely reflects extreme selection resulting from its small size and resultant high mass-specific water loss rate and low thermal time-constant. Nevertheless, the high water resistance attained with a very thin lipid barrier, and the mite's exceptional thermal tolerance, challenge existing theories seeking to explain physiological limits.
journal_name
J Insect Physioljournal_title
Journal of insect physiologyauthors
Wu GC,Wright JCdoi
10.1016/j.jinsphys.2015.08.002subject
Has Abstractpub_date
2015-11-01 00:00:00pages
1-7eissn
0022-1910issn
1879-1611pii
S0022-1910(15)00175-4journal_volume
82pub_type
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pub_type: 杂志文章
doi:10.1016/j.jinsphys.2011.05.013
更新日期:2011-09-01 00:00:00
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journal_title:Journal of insect physiology
pub_type: 杂志文章
doi:10.1016/j.jinsphys.2008.12.008
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journal_title:Journal of insect physiology
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更新日期:2002-08-01 00:00:00
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journal_title:Journal of insect physiology
pub_type: 杂志文章
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pub_type: 杂志文章
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