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The cartography of land covers was used to study fertility and soil evolution in a mountainous Mediterranean area during the anthropocene period ( Crutzen P J 2002 Geology of mankind Nature 415 23). The aim was to determine changes in fertility as agricultural lands were abandoned in the 14 000 hectare area that constitutes Sant Llorenç del Munt Natural Park in a pre‐coastal Catalan mountain range (north‐eastern Iberian Peninsula). The analysis of land covers using vegetation maps, orthorectified images and aerial photography has allowed us to differentiate six vegetation groups: holm‐oak wood, pine grove, oak wood, scrub, active agricultural fields and abandoned agricultural fields. The anthropic covers over the past 100 years were subdivided into five categories: active fields and those abandoned over four time periods. Study variables include field shape (concave, convex, flat), orientation (north, south) and slope (ranging from 12º to 24º). The parameters used for the physical‐chemical soil analysis included organic material, phosphorous and potassium; fertility was classified based on groups, types and classes. The results indicate that even when the visual appearance of certain landscapes is similar, the edaphic characteristics may be very different. Changes induced by human disturbance share this phenomenon. Therefore, land management should be considered globally, taking into account vegetation, soils and water as interdependent factors, since it is their interaction that produces landscape and most affects its evolution over time.

E. y Cruz, M. (2017) Presencia espacial y temporal de aves rapaces diurnas (Aves: Accipitriformes, Falconiformes) en Marismas Nacionales, Nayarit-Sinaloa, México. Acta Zoológica Mexicana (n.s.), 33(1), 27-38. RESUMEN.Las aves rapaces diurnas son un grupo esencial para el equilibrio en las comunidades y pueden ser utilizadas como indicadoras de la calidad del hábitat debido a su sensibilidad a la perturbación. Una de las zonas en México con gran importancia biológica y con graves problemas antropogénicos es Marismas Nacionales. Generar información básica de un grupo ornitológico poco estudiado en Méxi-co y dentro de una zona prioritaria como Marismas Nacionales se hace indispensable para planes de conservación y manejo del área. Por lo que en este estudio se determinó la riqueza espacial y temporal de aves rapaces diurnas durante ocho meses (noviembre de 2010 a junio de 2011) en nueve zonas de Marismas Nacionales. En cada visita se registraron y contabilizaron las especies por sitio y mes. En total se realizaron 945 registros de 22 especies, a las que se añaden cinco más observadas en una visita posterior (enero de 2012) con lo que se tiene una lista de 27 especie. La riqueza en invierno se incrementó con la llegada de cuatro especies migratorias y disminuyó en verano. Las especies más abundantes fueron las de habito necrófago (Cathartes aura, Coragyps atratus) y otra más migratoria (Pandion haliaetus) las cuales conjuntaron en 65% del total de registros. Las zonas con mayor número de especies fueron Zoquipan y las Garzas-Chahuín con 13 y 11 especies respectivamente. En cuanto a registros totales, Zoquipan y Chumbeño presentaron los más altos con 207 para el primero y 185 AbStRACt. Diurnal raptors are an essential group for balance in communities that can be used as habitat quality indicator owing to their sensitivity to disturbance. In Mexico one of the biologically significant areas and that faces serious anthropogenic issues is Marismas Nacionales. Comprehensive management and conservation assessments for the area will require to generate a baseline on poor studied group in Mexico such as raptors. Thus we determined spatial and temporal richness of diurnal raptors through eight months (November 2010 to June 2011) in nine sites of Marismas Nacionales, where we recorded and counted all species per site and month. In that period 945 records of 22 species were made, additionally other five species were observed on a subsequent visit (January 2012) therefore we had 27 species in total. Winter richness increased with the presence of four migratory species and decreased in summer. The most abundant species were the scavengers (Turkey vulture, Black vulture) and one migratory (Osprey); these three species comprised 65% of total records. We found the highest numbers of species in Zoquipan and Garzas-Chahuín (13 and 11 species respectively). In concern of total records, Zoquipan and Chumbeño presented the highest with 207 for the first and 185 the second one. The results shows a high richness of raptors in Marismas Nac...

Spatial and temporal presence of Aramus guarauna (Gruiformes: Aramidae) and Rostrhamus sociabilis (Accipitriformes: Accipitridae) in the Marismas Nacionales Biosphere Reserve, Nayarit, Mexico. Monthly visits were conducted at 12 sites located at Marismas Nacionales (November 2010 to June 2011). In five of them we regularly observed the Limpkin (Aramus guarauna) and in three, the Snail Kite (Rostrhamus sociabilis). The Apple Snail (Pomacea spp.) is abundant in the brackish wetlands and is the most important prey of both species. In 31 observations we recorded 493 limpkins, mainly in Las Cañadas and La Batanga (together: 64% of the records). In March and April we observed flocks of up 80 individuals, in probable relation with the dry season. We obtained 109 records of the kites, always lonely and concentrated in Zoquipan and Mexcaltitan (96%). The presence of the snail in Marismas Nacionales allows both species to expand their range along the Mexican Pacific, at least to the north of Sinaloa, were the lack of fresh water will hinder the establishment of snail populations.

Villagómez et al. Palabras clave: Gaviidae, Playa Azul, Distribución, Golfo de Tehuantepec. Primer registro del colimbo mayor (Gavia immerBrünnich AbstractWe recorded for the first time the Common Loon (Gavia immer) on the coast of Oaxaca state, Mexico. We observed an over-summering individual bird at the beach known as Playa Azul (07/13/2014), in the municipality of Salina Cruz, Oaxaca. The individual showed a non-breeding plumage, and has been observed in good condition. Due to the scarcity or lack of records by an irregular observation effort, the region could be considered as the natural distribution limit for the species.