000			02879nab a22004097a 4500
003			EC-PaCDF
005			20201205115734.0
008			160815t20132013xxu|||||||||||||||||eng||
040			_aEC-PaCDF _bspa _cEC-PaCDF
041			_aeng
082	0	4	_a581.62 _223
100	1		_aJäger, Heinke. _9235 _eautor
245	1	0	_aEcosystem changes in Galápagos highlands by the invasive tree Cinchona pubescens / _cHeinke Jäger ... [et al.].
260	3		_c2013.
300			_a: 1-12 p.
520	0		_aBackground and aims Various studies address changes in nitrogen and carbon cycling by exotic plant species, while impacts on phosphorus cycling are understudied. Therefore, we assessed the effects of the introduced Cinchona pubescens Vahl on plant and soil nutrients (especially phosphorus) in the highlands of Santa Cruz Island, Galápagos. Methods Nutrient analyses were carried out on soil, leaf litter, and leaf samples taken from Cinchona, the endemic shrub Miconia robinsoniana Cogn. and the native fern Pteridium arachnoideum (Kaulf.) Maxon. in plots invaded and previously invaded by Cinchona. Results Cinchona contained significantly more nitrogen, phosphorus and potassium in its green leaves than Miconia. Surprisingly, there was no evidence of phosphorus resorption in senesced Cinchona leaves. This was also the case in Miconia leaves, but only in Cinchonainvaded plots. Specific leaf area of Cinchona was significantly higher than of Miconia and Pteridium leaves, as was its litter turnover rate. Total soil nitrogen, ammonium and available phosphorus concentrations were higher in the invaded plots. Leaf litter from these plots also contained more phosphorus, which was positively correlated with the phosphorus concentrations in the soil. Conclusions these results suggest enhanced nutrient uptake by Cinchona and a faster decomposition of its litter, leading to increased nutrient availability in the soil. An accelerated cycling could promote spread of Cinchona and other introduced species, increasing the risk of further displacement of indigenous plant species in the Santa Cruz highlands.
546			_aInglés
550			_a1071
653			_aBiological invansion
653			_aInvasión biológica
653			_aConservation
653			_aConservación
653			_aEcological impacts
653			_aImpactos ecológicos
653			_aEcosystem functioning
653			_aEcosistema marcha
653			_aNutrient resorption proficiency
653			_aCompetencia de resorción de nutrientes
653			_aPhosphorus
653			_aFósforo
700	1		_aAlencastro, María José. _eautor
700	1		_aKaupenjohann, Martin. _eautor
700	1		_aKowarik, Ingo. _9397 _eautor
773	0		_tPlant and Soil _gVol. 371, No. 1-2 (Apr 2013), p. 629-640.
856	4	0	_uhttp://dx.doi.org/10.1007/s11104-013-1719-8
942			_2ddc _cARTICLE
999			_c12717 _d12717