Search

Copyright of Journal of Caribbean Ornithology is the property of Society for the Conservation & Study of Caribbean Birds and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

El estudio se realizó en el ciclo 2014-2015, en una huerta de toronja (Citrus paradisi Macf.) variedad Rio Red, del Municipio de General Terán, N.L. México. El objetivo fue evaluar la concentración de fructosa en frutos de toronja en desarrollo procedentes de árboles de producción elevada («on») y producción escasa («off»), en un ciclo de producción en respuesta a la aplicación de ácido giberélico (Acigib 10% de GA3 , 25 ppm), urea foliar (1 kg 100 L-1) y anillado de ramas. La fructosa fue cuantificada en frutos de toronja a los 30, 60 y 90 dda (días después de antesis). El análisis de fructosa se realizó mediante Cromatografía Líquida de Alta Presión (HPLC). A los 30 dda, las aplicaciones de urea foliar y GA3 en árboles «on» resultaron en los valores más altos en la concentración de fructosa en frutos. A los 60 dda no se presentaron diferencias estadísticas entre los tratamientos. A los 90 dda los frutos de árboles «on» con urea foliar y con anillado se comportaron estadísticamente diferentes al resto de los tratamientos, con menor concentración de fructosa. El comportamiento de la concentración de fructosa en frutos de toronja entre muestreos fue de un incremento en todos los tratamientos de árboles «on» y «off». Abstract This research was conducted during the production year 2014- 15 on a 18-year in a grapefruit (Citrus paradasi Macf.) grove, Rio Red variety in the municipality of General Teran, N.L. Mexico. The objective was to evaluate the concentration of fructose in small fruits from trees with a high production year («on») and others with a low production year («off») throughout the whole productive cycle, as a result of the application of gibberellic acid (Acigib 10% of GA3 , 25 ppm), foliar urea (1 kg 100 L-1) and girdling. Fructose was quantified in fruits of grapefruit at 30, 60 and 90 days after anthesis (DDA). Fructose analysis was done by High Pressure Liquid Chromatography (HPLC). According with the results, application of foliar urea and GA3 on trees «on» at 30 DDA, resulted in the highest values in the concentration of fructose in fruit. Treatments applied at 60 DDA resulted in not statistically differences for fructose concentration in fruits. Fruit fructose concentration from samples at 90 DDA showed statistical differences in trees «on» treated with foliar urea and girdling obtained the lowest concentration of fructose. The behavior of the concentration of fructose between samples was increased in all treatments of trees «on» and «off». Keywords: Girdling, carbohydrates, citrus, gibberellic acid, foliar urea.

Many North American landbird populations have declined in recent decades, including those that occupy Western forest habitats. Long-term monitoring of abundance and vital rates allows us to detect species and habitats of concern, and to identify potential management actions. Here, we analyze capture data from a regional network of 10 banding sites in the Klamath-Siskiyou Bioregion, USA, to examine demographic trends for 12 Western forest bird species from 2002 to 2013. Adult abundance declined significantly in some breeding populations of Audubon's Yellow-rumped Warbler (Setophaga coronata auduboni) and Purple Finch (Haemorhous purpureus), and near-significantly in Oregon Dark-eyed Junco (Junco hyemalis oreganus). We observed significant declines in productivity of the Purple Finch and Spotted Towhee (Pipilo maculatus). Black-headed Grosbeaks (Pheucticus melanocephalus) and Yellow-breasted Chats (Icteria virens) increased significantly in adult abundance, but with variation among sites. Productivity in one year was positively correlated with adult abundance in the following year for only one species, suggesting that local productivity may not be the proximate demographic cause of population change. Trends in adult abundance were generally heterogeneous across the landscape, while trends in productivity were more consistent among sites. Ten of 12 bird species exhibited similar or more positive trends in the Klamath-Siskiyou Bioregion than in the larger Pacific Northwest region as measured by Breeding Bird Survey data. Data from long-term banding sites that include productivity indices and breeding status of adults can provide important supplementary information to other longterm monitoring data and help to generate hypotheses regarding proximate demographic causes of local population trends. Future studies using regional networks of banding sites may begin to elucidate source-sink dynamics and the scale at which they operate, a topic with implications for species conservation. [ABSTRACT FROM AUTHOR]