A team of researchers from the University of Göttingen in Germany and Yale University (USA) has presented the most comprehensive description and characterization so far of bioclimatic and physical characteristics of the world’s islands.
Tropical island of volcanic origin: Îles de Salut, off the coast of French-Guayana.
Photo: Patrick Weigelt, Goettingen University
Global map of physical-geographical and climatic characteristics of the world’s islands. Similar colors indicate similar characteristics.
Picture: Patrick Weigelt, Goettingen University
Islands make up only five percent of the land surface of the Earth, but they are home to a disproportionately high number of plant and animal species and provide ecosystem functions and services to more than 500 million people.
However, a quantitative description of the ecological conditions on islands had been lacking so far. The study published this week in the prestigious scientific journal Proceedings of the National Academy of Sciences now closes this gap.
The researchers investigated almost 18,000 marine islands with areas greater than one square kilometer. They also compiled ecologically important climate data and precise information about physical factors such as area, distance to the next continent and the proportion of landmass in the surroundings of each island. “The data that have been available so far have been woefully incomplete, imprecise – and often just wrong,” Patrick Weigelt from the University of Göttingen, first author of the study, explained.
The researchers employed modern statistical approaches to describe, classify and map the islands based on differences in their environments. This allows the identification of islands with similar environmental settings and will facilitate further island biogeographical studies and biodiversity conservation.
“These new results provide a novel perspective on thousands of our planet’s islands,” said Prof. Dr. Holger Kreft from the University of Göttingen, leader of the study. For instance, 65 percent of all islands are located in the tropics, but compared to mainlands, island climates are on average cooler and more humid. “An interesting finding of our study is that there are many more islands with a temperate rainforest climate, one of the rarest ecosystems on Earth, than expected by chance,” said Prof. Kreft.
The new insights may play an important role in understanding the evolution of biological diversity on islands. “Islands are microcosms where the evolution of biological diversity can be studied. Now, for the first time, we have a standardized global data set as a starting point for further global studies on island biodiversity,” Kreft added.Original publication:
Thomas Richter | Uni Göttingen
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