Abstract
(1) Two experiments were conducted in a natural population of Salvia lyrata to investigate the effects of conspecific density on survival, fecundity and growth of established individuals. In both experiments, the density around monitored Salvia individuals was altered, either by removal of surrounding Salvia individuals within a specified distance, or by planting Salvia in as neighbours. (2) In both experiments, survival, fecundity and growth showed small responses to the density manipulations. The responses varied with individual size. In large individuals these traits tended to decrease with increasing density, whereas small plants were in several respects favoured by more crowded conditions. (3) The weakness of the responses to neighbours suggests that the population of mature Salvia is not strongly self-regulating at typical natural densities or that marked effects of crowding appear only after a delay of more than two years. Mortality at the seedling stage as well as density-independent determinants of growth appear to maintain the adult population below the threshold at which neighbour interactions have strong effects.
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Claims 5
Claim · model-written summary
Survival, fecundity and growth responded only slightly to density manipulation.
- Taxon
- Salvia lyrata
Salvia lyratat0 - Treatment
- density manipulationse0
- Outcome
- survival, fecundity and growthe0
- Direction
- small responsese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both experiments, survival, fecundity and growth showed small responses to the density manipulations.”
t0“Salvia Lyrata”
Claim · model-written summary
Survival, fecundity and growth of large individuals tended to decrease as density increased.
- Taxon
- Salvia lyrataSalvia lyratat0
- Treatment
- increasing densitye0
- Outcome
- these traitse0
- Direction
- decreasee0
- Qualifier
- large individualse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In large individuals these traits tended to decrease with increasing density”
t0“Salvia Lyrata”
Claim · model-written summary
Small plants were favoured in several respects by crowding.
- Taxon
- Salvia lyrataSalvia lyratat0
- Treatment
- more crowded conditionse0
- Outcome
- favourede0
- Direction
- favourede0
- Qualifier
- small plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small plants were in several respects favoured by more crowded conditions.”
t0“Salvia Lyrata”
Claim · model-written summary
The weak neighbour responses suggest that mature Salvia populations are not strongly self regulating at normal density or effects take over two years to appear.
- Outcome
- not strongly self-regulatinge0
- Qualifier
- at typical natural densities or that marked effects of crowding appear only after a delay of more than two yearse0
SalviaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The weakness of the responses to neighbours suggests that the population of mature Salvia is not strongly self-regulating at typical natural densities or that marked effects of crowding appear only after a delay of more than two years.”
Claim · model-written summary
Seedling mortality and density independent growth determinants appear to keep the adult population below the density where neighbour effects are strong.
- Taxon
- Salvia lyrataSalvia lyratat0
- Organ / stage
- seedling stagee0
- Outcome
- adult population below the thresholde0
- Qualifier
- density-independent determinants of growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mortality at the seedling stage as well as density-independent determinants of growth appear to maintain the adult population below the threshold at which neighbour interactions have strong effects.”
t0“Salvia Lyrata”