000			02314nam a2200301 a 4500
003			AR-ReUNN
005			20260702152900.0
008			260630s2002 fr |||||||||||||||||eng
041	0		_aeng
100	1		_aMezquida, Eduardo T. _9126439
700	1		_aMarone, Luis _9126440
245	1	0	_aMicrohabitat structure and avian nest predation risk in an open Argentinean woodland : an experimental study / Eduardo T. Mezquida ; Luis Marone
264		1	_aRoma _bElsevier Masson _c2002
500			_aMaterial de Recursos Electrónicos
520			_aAbstract: We studied the effect of the general structure of the nest plant, especially the presence of thorns, and the structural homogeneity of the nest patch, on the vulnerability of nests to predation, using natural and artificial nests. Artificial nests placed in non-thorny plants had a significantly lower predation rate and higher daily survival rate than those in thorny plants. The addition of a ‘thorny microhabitat’ around the immediate proximity of nests placed in non-thorny plants did not have any effect on vulnerability of nests to predation. Conversely, natural nests were located in patches of habitat with a higher density of the species of plant that supported the nest compared to patches selected at random. However, daily survival rate was similar for natural nests placed in patches with a higher or lower density of the species of nest plant in the four bird species analysed. Similarly, survival of artificial nests did not increase with the presence of a higher number of plants similar to the nest plant in the nest patch. Thus, the observed patterns of survival for natural and artificial nests did not seem to support the potential prey-site hypotheses. Birds appeared to be the main nest predators in this ecosystem. Behavioural aspects of the identified predators and habitat structure could explain the lack of effect of thorns and nest patch characteristics on nest survival.
650		4	_aPajaros _963221
650		4	_aArgentina _94258
650		4	_aDepredador _9118507
650		4	_aEspinas _9126441
650		4	_aThorns _9126442
650		4	_aNido _9126443
650		4	_aAves _91920
650		4	_aNidos Artificiales _9126444
650		4	_aMicrohabitat _9126445
942			_cMON
035			_a(AGROP)45170
001			218469
999			_c218469 _d218469
040			_aAR-ReUNN _bspa _cAR-ReUNN _eaacr2