9/10: Cameron et al 2005 Flashcards
how can a parasite directly and indirectly influence ?
direct: resource abstraction
indirect: influence inter and intra specific interactions
when infected with striga hermonthica what % grain yield loss did sorghum experience?
66%
in multi species assemblages what can parasitic plant shift?
relative species composition to favour certain species
what can a parasite steal/compete for and what can it do to host metabolism?
host resources such as N
influence host metabolic processes
what does R.minor rely on the host for?
most of its C and mineral nutrition
what can R.minor reduce in host?
photosynthesis and capacity to fix C
when infected with R.minor what happened to legume L.pratensis and forb G.verum?
legume significantly suppressed
forb species insensitive and a poorer host so wasn’t
what may infected hosts suffer a reduction in?
competitive ability
what can promote host growth?
increased N availability
when what is working together does the biggest reduction in host biomass occur?
competition and parasitism
what is variable?
magnitude of grass suppression
what does functional haustoria forming provide?
direct connectivity with host and vascular continuity
does the parasite inflict more damage on young infected hosts or mature ones?
young as smaller sink and source and is easier to gain nutrients from them
what type of meadow is more likely affected by parasite?
newer meadows rather than more established as are the more established are more diverse so less susceptible
what is one example of how to lessen effects of striga parasite in sorghum fields
- when is this not the case?
N fertilisation
- not Rhinanthus P.pratensis system where high nutrient levels reduce host competitive ability
