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Abstract: We compared the effects of two contrasting silvicultural treatments and prescribed fire on bird occupancy at Blacks Mountain Experimental Forest. Each silvicultural treatment was applied to two approximately 100 [...]

We modeled the relationship between egg flotation and age of a developing embryo for 24 species of shorebirds. For 21 species, we used regression analyses to estimate hatching date by modeling egg angle and float height, measured as continuous variables, against embryo age. For eggs early in incubation, we used linear regression analyses to predict hatching date from logit-transformed egg angles only. For late incubation, we used multiple regression analyses to predict hatching date from both egg angles and float heights. In 30 of 36 cases, these equations estimated hatching date to within four days of the true hatching date for each species. After controlling for incubation duration and egg size, flotation patterns did not differ between shorebirds grouped by mass ([greater than or equal to] 100 g or Key words: Charadriidae, embryo age, hatching date, Scolopacidae. Modelamos la relacion entre la flotacion del huevo y la edad de un embrion en desarrollo para 24 especies de aves playeras. Para 21 especies, usamos analisis de regresion para estimar la fecha de eclosion modelando el angulo del huevo y la altura de flotacion, medidos como variables continuas, contra la edad del embrion. Para huevos al inicio del periodo de incubacion, usamos analisis de regresion lineal para predecir la fecha de eclosion solo a partir de la transformacion logit de los angulos de los huevos. Para la parte final del periodo de incubacion, usamos analisis de regresion multiple para predecir la fecha de eclosion a partir de los angulos de los huevos y de la altura de flotacion. En 30 de los 36 casos, estas ecuaciones estimaron la fecha de eclosion con una exactitud de cuatro dias alrededor de la verdadera fecha de eclosion para cada una de las especies consideradas. Luego de ajustar los modelos considerando la duracion de la incubacion y el tamano del huevo, los patrones de flotacion no difirieron entre las aves playeras agrupadas por peso ([greater than or equal to] 100 g 6

Pacific West is poised for a conservation challenge 200 years after Meriwether Lewis and William Clark explored unchartered lands and river discovering 178 plant species and 122 animals. The Wildlife Conservation Society has learned that the key to wildlife conservation is to restore and work with the natural life cycles of streams and forests.

Riparian habitat in California is one of the most endangered wildlife habitats in the state. The Sacramento Valley has lost more than 95% of its riparian habitat since 1900. Restoration effort is underway to bring more migratory birds to this habitat. Similar effort is also being made in Oregon, which has resulted in restored streams through management of cattle grazing on public lands.

The Argentine workshop organizers had discussed and planned about the real possibility that the Highly Pathogenic Avian Influenza (HPAI) outbreak in the new world. HPAI virus has began spreading from human to human due to handling infected poultry. Details of the HPAI virus infection research are discussed.

A personal narrative is presented which explores the author's experience of attending the avian flu workshop.

We compared abundance, daily survival rate, nest site characteristics, food availability, nest activity, and nestling size of Dark-eyed Juncos (Junco hymenulis) between burned and unburned mechanically-thinned ponderosa pine (Pinus ponderosa) forest units, Dark-eyed Junco territory density, number of detections in point counts, and daily nest survival were similar between treatments. Average bare ground was 4.8 times higher and litter cover was 2.6 times lower at nest sites in burned units compared to unburned nest sites. However, there was 28% less burned area around nests compared to random points in burned units, indicating that juncos placed nests in unburned portions of burned units, They also selected non-traditional nesting sites in burned units such as root holes and in trees. Arthropod abundance was higher in burned units 1-year post burn although numbers were similar in the second-year post burn. Nest attentiveness and feeding rates were three times higher in burned units, possibly in response to increased food availability. The potentially negative effect of prescribed burning through reduction of litter and increase in bare ground was offset by novel nesting strategies and increased food availability. [ABSTRACT FROM AUTHOR]