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Titolo:
Responses to solar ultraviolet-B radiation in a shrub-dominated natural ecosystem of Tierra del Fuego (southern Argentina)
Autore:
Rousseaux, MC; Scopel, AL; Searles, PS; Caldwell, MM; Sala, OE; Ballare, CL;
Indirizzi:
Consejo Nacl Invest Cient & Tecn, IFEVA, Buenos Aires, DF, Argentina Consejo Nacl Invest Cient & Tecn Buenos Aires DF Argentina DF, Argentina Univ Buenos Aires, Buenos Aires, DF, Argentina Univ Buenos Aires Buenos Aires DF Argentina Buenos Aires, DF, Argentina Utah State Univ, Dept Rangeland Resources, Logan, UT 84322 USA Utah State Univ Logan UT USA 84322 ngeland Resources, Logan, UT 84322 USA Utah State Univ, Ctr Ecol, Logan, UT 84322 USA Utah State Univ Logan UT USA 84322 te Univ, Ctr Ecol, Logan, UT 84322 USA
Titolo Testata:
GLOBAL CHANGE BIOLOGY
fascicolo: 4, volume: 7, anno: 2001,
pagine: 467 - 478
SICI:
1354-1013(200104)7:4<467:RTSURI>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
UV-B; FIELD CONDITIONS; HEATH ECOSYSTEM; TOTAL OZONE; DNA-DAMAGE; GROWTH; ARABIDOPSIS; VULGARIS; PLANTS; ANTHOCYANIN;
Keywords:
Blechnum penna-marina; Chiliotrichum diffussum; Gunnera magellanica; herbivory; ozone hole; UV-B;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Ballare, CL Consejo Nacl Invest Cient & Tecn, IFEVA, Av San Martin 4453,C1417 DSE, Buenos Aires, DF, Argentina Consejo Nacl Invest Cient & Tecn Av San Martin 4453,C1417 DSE Buenos Aires DF Argentina
Citazione:
M.C. Rousseaux et al., "Responses to solar ultraviolet-B radiation in a shrub-dominated natural ecosystem of Tierra del Fuego (southern Argentina)", GL CHANGE B, 7(4), 2001, pp. 467-478

Abstract

A study was made of the effects of solar ultraviolet-B radiation (UV-B) onthe growth of the dominant plant species of a shrub-dominated ecosystem inTierra del Fuego. This part of southern Argentina can be under the direct influence of the Antarctic 'ozone hole' during the austral spring and lingering ozone-depleted air during the summer. The plant community is dominatedby an evergreen shrub (Chiliotrichum diffusum) with an herbaceous layer ofGunnera magellanica and Blechnum penna-marina in the interspaces between the shrubs. Inspections of ozone trends indicate that the springtime and summertime ozone column over Tierra del Fuego has decreased by 10-13% from 1978/9 to 1998/9. In a set of well-replicated field plots, solar UV-B was reduced to approximately 15-20% of the ambient UV-B using plastic films. Polyester films were used to attenuate UV-B radiation and UV-transparent films (similar to 90% UV-B transmission) were used as control. Treatments were imposed during the growing season beginning in 1996 and continued for three complete growing seasons. Stem elongation of the shrub C. diffusum was not affected by UV-B attenuation in any of the three seasons studied. However, frond length of B. penna-marina under attenuated UV-B was significantly greater than that under near-ambient UV-B in all three seasons. Attenuation of solar UV-B also promoted the expansion of G. magellanica leaves in two of thegrowing seasons. Differences between treatments in leaf or frond length inB. penna-marina and G. magellanica did not exceed 12%. Another significanteffect of UV-B attenuation was a promotion of insect herbivory in G. magellanica, with a 25-75% increase in the leaf area consumed. Changes in plant phenology or relative species cover were not detected within the time frameof this study. The results suggest that the increase in UV-B radiation associated with the erosion of the ozone layer might be affecting the functioning of this ecosystem to some degree, particularly by inhibiting the growthof some plant species and by altering plant-insect interactions.

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Documento generato il 09/04/20 alle ore 20:02:57