Taxonomical entities of the Chotoy spinetail Schoeniophylax phryganophilus (Aves: furnariidae) at the Paraná river floodplain, Argentina

The objective of this research was to study the barely known taxonomical entities of passerine Chotoy spinetail —Schoeniophylax phryganophilus— at the Paraná River floodplain, with the purpose of giving quantified data about trophic spectrum and diversity, circadian rhythm, habitat selection, niche amplitude, and prey size.Fil: Alessio, Viviana Graciela. Universidad Autónoma de Entre Ríos. Facultad de Ciencia y Tecnología; ArgentinaFil: Beltzer, Adolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

Nuevos aportes a la biología reproductiva de la Garcita Azulada <i>Butorides striatus</i> (Aves: Ardeidae)

We carried out observations on reproduction of eight breeding pairs of <i>Butorides striatus</i> fuscicollis nesting in the Zoological Experimental Station of Santa Fe city during springsummer 1989-1990. Twenty six eggs were laycd, 20 hatched and 19 fledglings were produced.The hatching time was 21 days and the nestling stayed in the nest 14 days

Biología de la alimentación del espinero grande Phacellodomus ruber (aves: Furnariidae) en el valle de inundación del río Paraná, Argentina

The objective was research the feeding biology of the Greater Thornbird, Phace-llodomus ruber in the floodplain Paraná River. We show the quali-quantitative analysis of thirteen (13) stomach contents. Captures and field observations were carried out at Carabajal Island (Santa Fe) as part of exploratory samples, on years 1981- 1991. The average of trophic diversity (H) was 1,74 and the accumulated trophic diversity (Hk) was 2,59. The results indicate a diet com-posed by 20 taxonomic entities (17 corresponded to the animal fraction; wile the remaining to the vegetal fraction). The values for the relative importance index (IRI) showed an omnivore diet where the Coleoptera were the main represented category, while the Arachnida, Lepidoptera and the seeds were the secondary categories. Trophic niche amplitude varied between 0,22 (spring); 0,78 (summer); 0,6 (autumm) and 0, 8 (winter). Alimentary efficiency (l´e) was 98%. Prey sizes ranged between 0,1 mm to > 8 mm, most of them captured early during the day (IF). The preference index showed a high selection for the forest (0,3) and the gallery forest (0,29). Phacellodomus ruber has an omnivorous diet, basically insectivorous, being included in the insectivorous bird’s guild with pecking and gleaning soil and foliage.Fil: Alessio, Viviana Graciela. Universidad Autónoma de Entre Ríos. Facultad de Ciencia y Tecnología; ArgentinaFil: Beltzer, Adolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin