Censo aéreo invernal de aves playeras en la costa de Sonora, México (invierno 2016-2017)

We evaluated the importance of Sonoran coastal lagoons for wintering shorebird by carrying out in February 2017 aerial surveys in 13 of the largest lagoons. We recorded 400,716 shorebirds, 70% corresponded to the southern portion, 9% to the middle portion and 21% to the north of the state. The three most important bays in numbers and percentages of shorebirds were Tóbari (127,570 records, 32%), Yavaros-Moroncarit (86,469 records, 21%) and Lobos (55,684 records, 14%). Other places with important abundances were San Jorge Bay (34,768 records, 9%), Santa Clara (18,769 records, 5%) and Colorado River's Delta (20,184 records, 5%). By size, small (15-22cm) and big (33cm or bigger) shorebirds abundances were similar (48% y 43%, respectively), medium size (23-32cm) shorebirds were uncommon (8%). Abundance ranks Sonora between the three most relevant states in Mexico for wintering shorebirds (along with Baja California Sur and Sinaloa).Evaluamos la importancia numérica de las lagunas costeras sonorenses para la invernada de aves playeras, a través de recorridos aéreos en las 13 lagunas de mayor tamaño durante febrero de 2017. Realizamos en total 400,716 registros, el 70% de éstos se llevaron a cabo en la porción sur, el 9% en el centro y el 21% al norte del estado. Las tres bahías con mayores números y porcentajes de aves playeras fueron Tóbari (127,570 registros, 32%), Yavaros-Moroncarit (86,469 registros, 21%) y Lobos (55,684 registros, 14%). Otros sitios con abundancias absolutas y relativas importantes fueron: Bahía San Jorge (34,768 registros, 9%), Santa Clara (18,769 registros, 5%) y el Delta del Río Colorado (20,184 registros, 5%). Por talla de los individuos, las abundancias de aves pequeñas (15-22 cm) y grandes (más de 36 cm) fueron similares (48% y 43%, respectivamente), las aves de talla media (24-30 cm) fueron menos comunes (8%). Los números encontrados permiten ubicar a Sonora entre los tres estados de la república con mayor abundancia de aves playeras invernantes (junto con Baja California Sur y Sinaloa)

Adynaton 5

Revista de narrativa y poesía escrita en los talleres literarios de CETYS Universidad."Adynaton" es una revista del Círculo de Letras de CETYS Universidad

Distribución espacio-temporal de aves Pelecaniformes en la salina de Guerrero Negro, B. C. S., México

This paper reports the temporal abundances of four species of Pelecaniforms (White Pelican, Pelecanus erythrorhynchos; Brown Pelican, P. occidentalis; Double-crested Cormorant, Phalacrocorax auritus; and Brandt's Cormorant, Ph.  penicillatus) in the Guerrero Negro saltworks (Baja California Sur, Mexico), along and anual cycle. The first is considered a migratory species, while the remaining three establish breeding colonies and remain in the area year round. The most abundant was Ph. auritus (1,806 birds/census), followed by P. erythrorhynchos (156), P. occidentalis (147), and Ph. penicillatus (1.1). Abundances where higher after the breeding season, particularly during winter. Within the saltworks, the preferred resa were those of low salinity, with the exception of those used as roostingsites. Results suggest this as an important area for the post-breeding dispersion, pass and feeding of these species.En este trabajo se presentan las abundancias temporales de cuatro especies de Pelecaniformes (pelícano blanco, Pelecanus erythrorthynchos; pelícano pardo, P. occidentalis; cormorán de doble cresta. Phalacrocorax auritus; y cormorán de Brandt, Ph. penicillatus) en la salina de Guerrero Negro (Baja Califronia Sur, México), durante un ciclo anual. La primera está considerada como una especie migratoria, mientras que las tres restantes establecen colonias y permanecen en el área a lo largo del año. La especie más abundante fue Ph. auritus (1,806 aves/censo), seguida de P. erythrorhynchos (156), P. occidentalis (147) y Ph. penicilatus (1.1). Las aves fueron más abundantes después de su período de reproducción, particularmente en el invierno. Dentro de la salina, los organismos se distribuyeron preferentemente en las áreas con menor salinidad, salvo en aquellas zonas utilizadas como posaderos. Los resultados sugieren que la salina es un punto importante para la dispersión posreproductiva, paso y alimentación de estas especies

Biología reproductiva del águila pescadora Pandion haliaetus en Isla Ballena, Laguna San Ignacio, Baja California Sur, México.

Impreso y PD

Spatiotemporal distribution of birds at the guerrero negro saltworks, Baja California Sur, Mexico

The saltworks development located near the Ojo de Liebre-Guerrero Negro coastal lagoon system, in Baja California Sur (Mexico), conforms a modified habitat used by resident and migratory) birds. To describe the species composition, distribution and abundance of this avifauna, 12 monthly censuses mere performed in the area, from December 1995 to December 1996. Ninety-five species were identified. Changes in the number of species during the study period (from a maximum of 61 in January to a minimum of 39 in July) are related to the presence or absence of migratory and/or wintering species. Fifteen of the species are protected by the Mexican Government under some kind of status (two endangered, seven threatened, one rare and five under special protection). Changes in the abundance were also related to the occurrence of migratory and wintering birds, with the highest numbers recorded between August and December. The lowest abundance, 5.561 birds, was recorded in June and the highest, 72,951 birds, in August. The most abundant species were Phalaropus lobatus (24.1% of the overall record), Calidris mauri (23.2%), Podiceps nigricollis (13.8%), Limosa fedoa (6.4%) and Branta bernicla (6.2%). These results confirm that this area is ornithologically important