Abstract
Summary The importance of positive plant – plant interactions is generally suggested to increase towards more stressful conditions, due to mutual stress amelioration between plants. Bioturbating macrodetritivores can also ameliorate stress through bioturbation, but can also become selective herbivores under food‐limited conditions, making the outcome of plant – plant interactions under stress in the presence of macrodetritivores unclear. We studied how combining environmental stress (waterlogging) with the presence of the soil macrodetritivore Orchestia gammarellus affected the outcome of the interaction between two salt marsh plants: the tall, late successional Elytrigia atherica and the shorter, early successional Festuca rubra . In a replacement design competition experiment under controlled conditions, we found that soil redox potential was negatively affected by waterlogging and positively affected by the presence of O. gammarellus . The survival and shoot biomass of E. atherica was not significantly affected by waterlogging or by the presence of bioturbators. The survival and shoot biomass of F. rubra was especially decreased when waterlogging was combined with the presence of O. gammarellus , as this macrodetritivore turned into a selective grazer on F. rubra under these conditions. We found that E. atherica produced double shoot biomass and F. rubra produced much less shoot biomass in their mixed cultures than was expected from the monocultures of same waterlogging/ Orchestia treatments. Hence, the presence of the bioturbator strongly promoted the competitive advantage of E. atherica over F. rubra due to the combination of stress amelioration for the first species and selective herbivory on the second species. Synthesis . This study shows that the inclusion of bioturbating macrodetritivores complicates the standard prediction that plant – plant interactions become more positive towards more stressful conditions. A novel insight is that macrodetritivores can affect the structure and diversity of plant communities through multiple mechanisms. Under benign conditions bioturbating macrodetritivores ameliorated soil conditions, permitting co‐occurrence of competing plant species. At high environmental stress (waterlogging) macrodetritivores selectively graze higher quality plant species and emerging seedlings, thus promoting dominance of the lower quality species. Hence, the facultative feeding behaviour of macrodetritivores deserves further attention.
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Claims 7
Claim · model-written summary
Waterlogging lowered soil redox potential.
- Taxon
- Elytrigia atherica
Elymus athericuse1 - Treatment
- waterlogginge0
- Outcome
- soil redox potentiale0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil redox potential was negatively affected by waterlogging and positively affected by the presence of O. gammarellus”
e1“Elytrigia atherica and the shorter, early successional Festuca rubra”
Claim · model-written summary
O. gammarellus increased soil redox potential.
- Taxon
- Elytrigia athericaElymus athericuse1
- Treatment
- presence of O. gammarelluse0
- Interactor
- O. gammarellus
Orchestia gammarelluse0herbivore - Outcome
- soil redox potentiale0
- Direction
- positivelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil redox potential was negatively affected by waterlogging and positively affected by the presence of O. gammarellus”
e1“Elytrigia atherica and the shorter, early successional Festuca rubra”
Claim · model-written summary
E. atherica survival and shoot biomass were not significantly changed by waterlogging.
- Taxon
- E. athericaElymus athericuse0
- Treatment
- waterlogginge0
- Outcome
- survival and shoot biomasse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The survival and shoot biomass of E. atherica was not significantly affected by waterlogging or by the presence of bioturbators.”
Claim · model-written summary
E. atherica survival and shoot biomass were not significantly changed by bioturbators.
- Taxon
- E. athericaElymus athericuse0
- Treatment
- presence of bioturbatorse0
- Outcome
- survival and shoot biomasse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The survival and shoot biomass of E. atherica was not significantly affected by waterlogging or by the presence of bioturbators.”
Claim · model-written summary
Combined waterlogging and O. gammarellus decreased F. rubra survival and shoot biomass.
- Taxon
- F. rubra
Festuca rubrae0 - Treatment
- waterlogging was combined with the presence of O. gammarelluse0
- Interactor
- O. gammarellusOrchestia gammarelluse0herbivore
- Outcome
- survival and shoot biomasse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The survival and shoot biomass of F. rubra was especially decreased when waterlogging was combined with the presence of O. gammarellus”
Claim · model-written summary
E. atherica produced double the expected shoot biomass in mixed cultures.
- Taxon
- E. athericaElymus athericuse0
- Outcome
- shoot biomasse0
- Direction
- doublee0
- Value
- doublee0
- Comparator
- monoculturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“E. atherica produced double shoot biomass and F. rubra produced much less shoot biomass in their mixed cultures than was expected from the monocultures of same waterlogging/ Orchestia treatments.”
Claim · model-written summary
F. rubra produced less shoot biomass than expected in mixed cultures.
- Taxon
- F. rubraFestuca rubrae0
- Outcome
- shoot biomasse0
- Direction
- much lesse0
- Comparator
- monoculturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“E. atherica produced double shoot biomass and F. rubra produced much less shoot biomass in their mixed cultures than was expected from the monocultures of same waterlogging/ Orchestia treatments.”
The same questions in other papers
flooding · growth · Festuca rubraResults agree
2 papers in the same direction as this paper
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.