نتایج جستجو برای: غنای کل total richness

تعداد نتایج: 878333  

2015
Josil P Murray Richard Grenyer Sven Wunder Niels Raes Julia PG Jones

There are concerns that Reduced Emissions from Deforestation and forest Degradation (REDD+) may fail to deliver potential biodiversity cobenefits if it is focused on high carbon areas. We explored the spatial overlaps between carbon stocks, biodiversity, projected deforestation threats, and the location of REDD+ projects in Indonesia, a tropical country at the forefront of REDD+ development. Fo...

2004
CHRISTOPHER F. STEINER

1. A large body of recent theory has recently developed focused on the relationship between the species diversity of competitor assemblages and the temporal stability of total competitor biomass. Many of these models predict that stability can increase with increasing diversity. 2. To explore natural relationships between zooplankton taxonomic diversity and temporal stability of total zooplankt...

Journal: :International journal for parasitology 1999
S Morand R Poulin K Rohde C Hayward

Interspecific interaction may lead to species exclusion but there are several ways in which species can coexist. One way is by reducing the overall intensity of competition via aggregated utilisation of fragmented resources. Known as the 'aggregation model of coexistence', this system assumes saturation and an equilibrium number of species per community. In this study we tested the effects of i...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2011
C K Fagundes R A Di Mare C Wink D Manfio

The conservationist community is giving special attention to epigean insects due to their importance in the preservation of terrestrial habitats. This work analysed the diversity, richness, abundance and similarity at the soil surface of Coleoptera composition among five environments: native forest, native grassland, Pinus elliottii plantation, Eucalyptus saligna plantation and degraded area by...

2017
Polyanna da Conceição Bispo Heiko Balzter Yadvinder Malhi J W Ferry Slik João Roberto Dos Santos Camilo Daleles Rennó Fernando D Espírito-Santo Luiz E O C Aragão Arimatéa C Ximenes Pitágoras da Conceição Bispo

We analysed the flora of 46 forest inventory plots (25 m x 100 m) in old growth forests from the Amazonian region to identify the role of environmental (topographic) and spatial variables (obtained using PCNM, Principal Coordinates of Neighbourhood Matrix analysis) for common and rare species. For the analyses, we used multiple partial regression to partition the specific effects of the topogra...

2011
Anne Mraja Sybille B. Unsicker Michael Reichelt Jonathan Gershenzon Christiane Roscher

BACKGROUND Forecasting the consequences of accelerating rates of changes in biodiversity for ecosystem functioning requires a mechanistic understanding of the relationships between the structure of biological communities and variation in plant functional characteristics. So far, experimental data of how plant species diversity influences the investment of individual plants in direct chemical de...

2013
Liebl Jürgen Bauhus

Low density plantings complemented by natural regeneration is an increasingly common reforestation technique to ensure growth of a sufficient number of trees from desired species while maintaining natural processes such as succession. One such form of low density planting that aims at lowering establishment costs—oak clusters—has been developed as an alternative to row planting since the 1980s ...

Journal: :European Journal of Combinatorics 2009

باقری, علیرضا , بنایان اول, محمد, شافنر, اورس, قربانی, رضا,

Considering the importance of plant diversity and to evaluate the effect of grazing pressure on species richness and structure of plant communities, this experiment was conducted at Golestan National Park and its surrounding areas in the north east of Iran. Sampling was conducted in intact and abandoned habitats and habitats under seasonal and heavy grazing, using Modified Whitaker Plot in 1, 1...

عباس اسماعیلی, , محمدرضا احمدی, , احمد قانع, , علیرضا میرزاجانی, ,

Present study investigates macrobenthic invertebrates and their community structure in Chafrood river to classify and assess the study sites regarding the environmental anthropogenic factors. Along a 9 km distance, 8 study sites were selected, and macrobenthic were monthly sampled using a surber sampler (1600cm2, 250 μ mesh net) with 3 replicate at each station. Collected samples organisms were...

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