Topic
Brickellia diffusa
About: Brickellia diffusa is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 132 citations.
Papers
TL;DR: Fossil pollen and macrofossils from four sites in the highlands of Santa Cruz Island reveal that all were present thousands of years before the advent of human impact, refuting their classification as introduced species.
Abstract: Paleoecological evidence from the past 8000 years in the Galapagos Islands shows that six presumed introduced or doubtfully native species (Ageratum conyzoides, Borreria laevis/Diodia radula‐type, Brickellia diffusa, Cuphea carthagenensis, Hibiscus diversifolius, and Ranunculus flagelliformis) are in fact native to the archipelago. Fossil pollen and macrofossils from four sites in the highlands of Santa Cruz Island reveal that all were present thousands of years before the advent of human impact, refuting their classification as introduced species. These findings have substantial implications not only for conservation in Galapagos but for the management of introduced species and pantropical weeds in general.
105 citations
TL;DR: In this article, an investigation of Brickellia diffusa afforded three new dehydronerolidol derivatives and five new labdane derivatives, all highly oxygenated, elucidated by spectroscopic methods and a few chemical transformations.
8 citations
TL;DR: The annual species, Brickellia diffusa, was investigated for its flavonoid content and five mono- and diglycosides of kaempferol, a quercetin digly coside and a 6-methoxyquercetagetin mono-glycoside were isolated.
3 citations
TL;DR: Six plants once considered doubtful natives or introduced are actually native to the Galápagos flora, and the application of palaeobotanical data to conserving and restoring native biodiversity is demonstrated.
Abstract: The Galapagos Islands are globally renowned for their ecological value and as a world symbol of scientific discovery; however the native biodiversity of this unique region is currently under threat. One of the primary concerns is the detrimental impact of approximately 750 nonnative plants introduced over the last 500 years of human presence in the archipelago. In addition to these known introduced species, there are an additional 62 vascular plants classified as "doubtful natives," where native status remains unclear. To help address the questions of provenance regarding these doubtfully native species and their impact on highland ecosystems over the past 500-1000 years, we analyzed plant macrofossils in sedimentary records. Appropriate species classification (native or introduced) was determined using baseline data of species presence on the islands. We confirmed that six plants (Ageratum conyzoides, Solanum americanum, Ranunculus flagelliformis, Brickellia diffusa, Galium canescens, and Anthephora hermaphrodita) once considered doubtful natives or introduced are actually native to the Galapagos flora. These results have relevance not just for the Galapagos but also many other oceanic islands in demonstrating the application of palaeobotanical data to conserving and restoring native biodiversity.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2011 | 1 |
| 2008 | 1 |
| 1988 | 1 |
| 1982 | 1 |