Ecosystem succession and nutrient retention: A hypothesis

Ecosystem succession and nutrient retention:a hypothesis. 25: 376-381.

Ecosystem succession and nutrient retention ..

Begonia contains 1820 species and is amongst the world’s largest angiosperm genera. The genus has a pantropical distribution, characterised by extremely high rates of narrow endemism. The distribution of Begonia species richness is representative of rainforest diversity generally, being markedly greater in the Neotropics and tropical Asia, and suggests the family is a good proxy for investigating tropical diversification. Much of the research into the generation of large-scale patterns of tropical diversity has focused on trees, however herbaceous layer genera such as Begonia represent an ecologically contrasting aspect of tropical vegetation and need to be included if we are to have a complete understanding of tropical ecosystems. The prevalence of Begonia across the tropics suggests a highly successful strategy in exploiting the niches available to tropical herbs. In order to understand the generation of such a large radiation, we need insights into the interplay of niche evolution, physiology and genome evolution, building on the foundations of a sound taxonomy and robust phylogenetic hypotheses. Preliminary phylogenetic hypotheses for Begonia have been constructed, based on a small number of genome regions. Insights from next generation approaches need to be explored to show us what extent these represent species trees in the light of data on hybridisation and organelle capture. In addition we need to understand the degree of niche differentiation between species with respect to both phylogeny and genomic evolution. In this symposium we aim to bring together a variety of disciplines to give insight into the evolution of Begonia diversity, drawing on recent advances in research of niche evolution, genome dynamism, reproductive biology, photosynthetic physiology, biogeography, and management of biodiversity data. The building of a synthetic picture of evolution in the mega-diverse genus Begonia has the potential to provide a template for understanding broader patterns tropical herbaceous diversity.

22/02/2005 · Finn, JT 1982 Ecosystems succession, nutrient cycling and ..

succession and nutrient retention hypothesis…

The study assessed four ecosystem services provided by Sonoma County landscapes: carbon storage, sediment retention, nutrient retention and water yield.

Ecosystem succession and nutrient retention: a hypothesis

The study assessed four ecosystem services provided by Sonoma County landscapes: carbon storage, sediment retention, nutrient retention and water yield.

Ecosystem Succession and Nutrient Retention: ..

Urban ecology and sustainability: The state-of-the …

To quantify the ecosystem services provided by conserved lands in Sonoma County, we used InVEST to estimate carbon storage, sediment retention, nutrient retention (nitrogen and phosphorus) and water yield. We chose these four ecosystem services because of their importance and because they can be degraded by land-use conversions. Carbon sequestration is being monetized in the California carbon markets, and methods to evaluate carbon storage are needed statewide. Land conversions to more developed uses generally reduce carbon on the landscape. Sediment and nutrient retention impact water quality, which is important for human needs and also ecosystem needs; conversions of vegetation often result in poorer water quality. In the current era of drought, water yield from California landscapes is a topic of public concern, as every drop of water becomes more valuable. Land-use conversions can impact the amount of groundwater recharge or loss through runoff.