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Titolo:
Rapid cold hardening in Antarctic microarthropods
Autore:
Worland, MR; Convey, P;
Indirizzi:
British Antarctic Survey, Nat Environm Res Council, Cambridge CB3 0ET, England British Antarctic Survey Cambridge England CB3 0ET idge CB3 0ET, England
Titolo Testata:
FUNCTIONAL ECOLOGY
fascicolo: 4, volume: 15, anno: 2001,
pagine: 515 - 524
SICI:
0269-8463(200108)15:4<515:RCHIAM>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALASKOZETES-ANTARCTICUS; CRYPTOPYGUS-ANTARCTICUS; SIGNY ISLAND; TOLERANCE; COLLEMBOLA; HARDINESS; TEMPERATURE; INSECTS; MITES; ARTHROPODS;
Keywords:
cold tolerance; collembola; differential scanning calorimeter; gut clearance; mite;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Worland, MR British Antarctic Survey, Nat Environm Res Council, High Cross,Madingley Rd, Cambridge CB3 0ET, England British Antarctic Survey High Cross,Madingley Rd Cambridge England CB3 0ET
Citazione:
M.R. Worland e P. Convey, "Rapid cold hardening in Antarctic microarthropods", FUNCT ECOL, 15(4), 2001, pp. 515-524

Abstract

1. Rapid cold hardening was examined in three common Antarctic microarthropods using differential scanning calorimetry over timescales between 3 and 30 h, under field and controlled laboratory conditions.2. In fresh field samples and cultures of the springtail, Cryptopygus antareticus (Willem), and cultures of the mites, Alaskozetes antarcticus (Michael) and Halozetes belgicae (Michael), maintained under summer field-simulating conditions, supercooling point (SCP) distributions tracked microhabitattemperature variation over the observation period.3. Controlled acclimation of samples of summer-acclimatized C. antarcticuscaused significant cold hardening after 12 h at temperatures around 0 degreesC (+3 to -2 degreesC). No response was obtained at higher or lower temperatures, or in field-fresh winter-acclimatized animals. The latter did not lose cold hardiness when held at positive temperatures for 12 h.4. Gradual cooling of C antarcticus over 20 h from +5 to -5 degreesC caused a considerable increase in cold tolerance. Rewarming partially but non-significantly reversed this effect. The greatest response occurred between +3and +1 degreesC. Maximum faecal pellet production also occurred in this interval, but gut clearance alone was not sufficient to explain observed coldhardening.5. It is hypothesized that these species possess a hitherto unrecognized capacity to alter cold hardiness in summer in response to environmental temperature cues over a shorter timescale than previously thought, by a mechanism that relies on neither gut clearance nor concentration of body fluids via water loss. This ability may reduce the developmental costs of premature entry into an inactive, cold-hardy state.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:29:55