Treesearch

From 1995 to 2003 we studied species composition and structure in a secondary subtropical wet forest in Utuado Puerto Rico. During September 21-22, 1998, hurricane Georges passed through the stand with maximum sustained winds of 184 km/h and gusts of 240 km/h. Species richness increased after the hurricane. While native species Miconia prasina reduced its Importance Value, the naturalized species Eugenia jambos (synonymous with Syzygium jambos) increased in Importance Value because of the hurricane. Effects to the forest structure brought about by the hurricane were more noticeable in the...

We studied changes that occurred between 1997 and 2005 on a secondary wet subtropical urban forest in the University of Puerto Rico’s Botanical Garden (Bosque Estatal del Nuevo Milenio). Hurricane Georges passed south of the forest on November 21, 1998 with 127 km/h winds. The study consisted of identifying species in 40 plots of 254 m2 each, measuring the diameter at breast height (dbh) and height of the trees and estimating the structural indexes (basal area and tree density, species Importance Value [IV], growth and death rates of trees, and recruitment to the > 4cm dbh class). The...

The following critiques express the opinions of the individual evaluators regarding the strengths, weaknesses, and value of the books they review. As such, the appraisals are subjective assessments and do not necessarily refl ect the opinions of the editors or any offi cial policy of the American Ornithologists’ Union.

RECENT HURRICANES have raised concerns regarding the fate of many Caribbean birds, especially for rare, single island endemic species. Although Caribbean birds and their habitats have evolved in an area with a high hurricane frequency and are assumed to be relatively resilient to storm effects, habitat loss and degradation and various other human impacts may place certain species at risk to hurricanes. This symposium was designed to review knowledge regarding hurricane effects on birds and their habitats; dispel myths; identify information needs; review pre- and post- hurricane monitoring...

Los artículos en este número especial documentan un cambio en el enfoque de aprovechamiento maderero, de la explotación minera al manejo sostenible por parte de las comunidades rurales que ahora cuentan con más información y conocimiento de sus derechos.

The present treatment constitutes an updated revision for the monocotyledon and gymnosperm flora (excluding Orchidaceae and Poaceae) for the biogeographical region of Puerto Rico (including all islets and islands) and the Virgin Islands. With this contribution, we fill the last major gap in the flora of this region, since the dicotyledons have been previously revised. This volume recognizes 33 families, 118 genera, and 349 species of Monocots (excluding the Orchidaceae and Poaceae) and three families, three genera, and six species of gymnosperms. The Poaceae with an estimated 89 genera and...

I calculated various shell properties, water vapor loss, and hatching success of eggs of the Pearly-eyed Thrasher (Margarops fuscatus) using measurements obtained during a long-term study in the Luquillo Mountains, Puerto Rico. Empirical results were comparable to standard reference formulae, demonstrating that published formulae can be used with confidence by field biologists studying this and other passerine birds laying prolate spheroid shaped eggs. Shell mass averaged 0.66 g and shell thickness averaged 0.12 mm. Egg surface area averaged 19.31 cm2 (range =18.4-20.34 cm2) as derived...