"Students from a remote part of Nepal learned about forest ecology with the support of the BES Innovation and Research grants"

Jyoti Bhandari BES Grant winner 2009

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Oral Session 18: Competition - Resources Space and Time

Wednesday 19 December

Add 11:45 The hare and the tortoise: strategies for plant competition
    Markus Eichhorn (University of Nottingham), Reuben Nilus (Forest Research Centre Sepilok Sabah Malaysia), David Burslem (University of Aberdeen)
   

Plant growth is often characterised as a single rate parameter, yet this obscures strategic variation in not only the magnitude of peak growth, but also its timing and duration. We document growth of tree seedlings in rain forest gaps in Malaysia over ten years and illustrate variation across species and with respect to resource conditions. 

Add 12:00 Ant communities of the high rainforest canopy are structured competitively through space and time
    Kalsum Yusah (Inst. for Tropical Biology Conservation Universiti Malaysia Sabah), Tom Fayle (University of South Bohemia), William Foster (University of Cambridge)
   

Most ant communities are thought to be strongly structured by competition. We investigated this in the high canopy (>40m) of tropical rainforest in Borneo. Using null models of species co-occurrence we demonstrate that ant communities show competitive structuring both spatially (within and between trees), and temporally (24-hour periods). Ant communities are competitively structured, even in this extreme environment.

Add 12:15 DIVERSITY AWARENESS: Using genetic mixtures to improve yield stability
    Henry Creissen (John Innes Centre), Tove Jorgensen (University of East Anglia), James Brown (John Innes Centre)
   

Agricultural practices rely on the use of monocultures to achieve high yields. Genetic mixtures may provide a response to the challenge of increasing yield stability in unpredictable environments, without high dependence on chemical inputs. Data from large scale experiments indicate a positive effect of mixtures in stabilising yield across environments through compensatory interactions.

Add 12:30 Natal environment impacts adult reproductive success in burying beetles (Nicrophorus vespilloides)
    Ailsa McLean (University of Oxford), Andres Arce (University of Manchester), Per Smiseth (University of Edinburgh), Daniel Rozen (Leiden University)
   

Burying beetles rear their offspring on carrion, providing high levels of parental care.  Larvae face severe competition from microbes during development and this competition affects reproductive success.  We find that poor natal environment negatively affects parental performance in adulthood, but beetles can partially mitigate this effect via changes in investment. 

Add 12:45 Predicting foraging time constraints under environmental change: an individual based model of social foraging behaviour
    Harry Marshall (Institute of Zoology ZSL), Alecia Carter (University of Cambridge), Tim Coulson (Imperial College London), J Marcus Rowcliffe (Institute of Zoology ZSL), Guy Cowlishaw (Institute of Zoology ZSL)
   

Foraging time is an important constraint on social animals’ ability to invest in other fitness-linked activities. We develop and validate a model of individual baboon foraging behaviour predicting the time they need to spend foraging in differing environments. In deteriorating environments this model predicts a rapid increase in foraging time to the point where individuals cannot gather enough resources.

Add 13:00 Seasonal variation and land-use effects on competition for nitrogen uptake between plant and soil microbial communities in subalpine grasslands
    Nicolas Legay (Laboratoire d'Ecologie Alpine), Fabrice Grassein (Laboratoire d'Ecophysiologie Vegetale et Agronomie), Sandra Lavorel (Laboratoire d'Ecologie Alpine), Emmanuelle Personeni (Laboratoire d'Ecophysiologie Vegetale et Agronomie), Marie-Paule Bataillé (Laboratoire d'Ecophysiologie Vegetale et Agronomie), Matt Robson (Department of Biosciences Plant Biology), Jean-Christophe Clément (Laboratoire d'Ecologie Alpine)
   

At the end of snowmelt, plant rates of N uptake exceeded those of microbes due to either a crash in microbial communities or to their compositional turnover. While vegetation dominated by conservative plants grew steadily until biomass peak, exploitative communities maximised growth in response to the soil N pulse at snowmelt.

Add 13:15 Plant root exudates mediate neighbour recognition and trigger complex behavioural changes
    Marina Semchenko (University of Tartu), Sirgi Saar (University of Tartu), Anu Lepik (University of Tartu), Kristjan Zobel (University of Tartu)
   

The mechanisms by which plants detect the presence and identity of competitors remain largely unknown. We found that plant root exudates can carry very specific information about the genetic relatedness, species identity and population origin of neighbours. Moreover, exudates can trigger far more complex behavioural changes than has previously been shown.

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