in the environment is by monitoring animal populations over long periods. Over the past five years, for example, Robert G. Mayer has documented 126 bird species at the Arnold Arboretum, including 46 confirmed breeders and another five probable breeders. Using data from several earlier studies, Mayer was able to document the absence of at least 27 species that had once bred successfully at the A...

'Center for Tropical Forest Science Arnold Arboretum Asia Program, Harvard University Herbaria, Harvard University, Cambridge, MA 02138, USA, Center for Tropical Forest Science, Smithsonian Tropical Research Institute, PO Box 0843-03092, Balboa, Panama, Republic of Panama, 3 Forest Research Institute Malaysia, Kepong 52109, Selangor, Malaysia and Center for Tropical Forest Science-Arnold Arbore...

Malate dehydrogenases (MDHs) play crucial roles in the physiological processes of plant growth and development. In this study, 13 and 25 MDH genes were identified from Gossypium raimondii and Gossypium hirsutum, respectively. Using these and 13 previously reported Gossypium arboretum MDH genes, a comparative molecular analysis between identified MDH genes from G. raimondii, G. hirsutum, and G. ...

a winding pathway so that visitors encountered specimens in a taxonomic sequence. Growing related plants together, in effect, organizes a collection into a living encyclopedia, allowing for comparison of the characteristics of species within a genus or genera within a family. By planting related taxa in an evolutionary progression, the more complicated sequential taxonomic arrangement reveals t...

ciation with the institution, he was interested in botany and in horticulture, his first appointment at Harvard University bemg as Director of the Botanic Garden in Cambrtdge. On assuming the directorship of the Arnold Arboretum in 1873, he already appreciated the tremendous value of collections of living plants as a means of promoting public interest in horticulture. His desire for study and f...

The western pond turtle Emys (formerly Clemmys) marmorata is declining throughout its range, primarily due to loss of habitat via urbanization and conversion to agriculture. Urban waterways present several important challenges to freshwater turtle populations, but they also present an opportunity to maintain declining species in a ubiquitous habitat that has high public visibility. The arboretu...