000			02067nab a2200253 a 4500
003			AR-ReUNN
005			20260702003059.0
008			260630s2007 ag |||||||||||||||||spa
041	0		_aspa _aeng
100	1		_aCazzaniga, Néstor J. _9147164
245	1	0	_aCaracterización química y faunística de canales de drenaje del valle inferior del Río Colorado - Partido de Villarino y Patagones, Provincia de Buenos Aires - / Néstor J. Cazzaniga
264		1	_c2007
300			_a22 páginas
500			_aDisponible en estante de INICNE Chemical and faunistic characterization of drainage channels of the Lower Colorado River Valley (Villarino and Patagones Districts, Buenos Aires Province
520			_aThis is a contribution to the study of the salty soil de degradation, produced by outcrop of underground salt water, in the Lower Colorado River Valley. The process is made worse by the excesive growth of submerged aquatic weeds in the drainage system. The macroscopic aspect of the problem is shown in a nonquatizated flow diagram. On the basis of fortnightly water analysis, main chemical features of four principal channels are reported. For each month and channel Schoeller´s graphs are added and ionic variation through the year is pointed out. The meiofauna related to aquatic weeds was identified and some observations on alimentary habits were made. Bafon-benthos complex is a low diversity community with unispecific dominance of the gastropod Littoridina parchappii (Hydrobiidae). Trophic relationships of this fauna are graphically displayed. The lack of an effective predation on weeds may be a factor of their exuberant development and the introduction of the macrophytophagus snail Ampullaria canaliculata Lamarck, 1801, as a potential biocontrol agent, is proposed.
650		4	_aPeces de Agua Dulce _96471
650		4	_aArgentina _94258
650		4	_aFreshwater Fish _9117439
650		4	_aInland Waters _9117440
773	0		_tEcosur _x0325-108X _gv. 8 n. 15 (1981) _w234603
942			_cART
035			_a(INICN)39199
001			234800
999			_c234800 _d234800
040			_aAR-ReUNN _bspa _cAR-ReUNN _eaacr2