Abstract
Similar patterns of dispersal and gene flow between closely associated organisms may promote local adaptation and coevolutionary processes. We compare the genetic structures of the two species of a plant genus (Roridula gorgonias and R. dentata) and their respective obligately associated hemipteran mutualists (Pameridea roridulae and P. marlothi) using allozymes. In addition, we determine whether genetic structure is related to differences in host choice by Pameridea. Allozyme variation was found to be very structured among plant populations but less so among hemipteran populations. Strong genetic structuring among hemipteran populations was only evident when large distances isolated the plant populations on which they live. Although genetic distances among plant populations were correlated with genetic distances among hemipteran populations, genetic distances of both plants and hemipterans were better correlated with geographic distance. Because Roridula and Pameridea have different scales of gene flow, adaptation at the local population level is unlikely. However, the restricted gene flow of both plants and hemipterans could enable adaptation to occur at a regional level. In choice experiments, the hemipteran (Pameridea) has a strong preference for its carnivorous host plant (Roridula) above unrelated host plants. Pameridea also prefers its host species to its closely related sister species. Specialization at the specific level is likely to reinforce cospeciation processes in this mutualism. However, Pameridea does not exhibit intraspecific preferences toward plants from their natal populations above plants from isolated, non-natal populations.
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Claims 11
Claim · model-written summary
Allozyme variation was strongly structured among populations of the two Roridula species.
- Taxon
- Roridula gorgonias and R. dentata
Roridula gorgonias
Roridula dentatae0 - Outcome
- Allozyme variatione1
- Qualifier
- very structured among plant populationse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roridula gorgonias and R. dentata”
e1“Allozyme variation was found to be very structured among plant populations”
Claim · model-written summary
Allozyme variation among populations of the Pameridea hemipterans was less structured than among the plant populations.
Verbatim
e0“Pameridea roridulae and P. marlothi”
e1“Allozyme variation was found to be very structured among plant populations but less so among hemipteran populations”
Claim · model-written summary
Strong genetic structuring among hemipteran populations was evident only when large distances isolated the plant populations they live on.
Verbatim
e0“Pameridea roridulae and P. marlothi”
e1“Strong genetic structuring among hemipteran populations was only evident when large distances isolated the plant populations on which they live”
Claim · model-written summary
Genetic distances among plant populations were correlated with genetic distances among hemipteran populations.
- Taxon
- Roridula gorgonias and R. dentataRoridula gorgoniasRoridula dentatae0
- Outcome
- genetic distances among plant populationse1
- Comparator
- genetic distances among hemipteran populationse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roridula gorgonias and R. dentata”
e1“genetic distances among plant populations were correlated with genetic distances among hemipteran populations”
Claim · model-written summary
Genetic distances of both plants and hemipterans were better correlated with geographic distance.
Verbatim
e0“genetic distances of both plants and hemipterans were better correlated with geographic distance”
Claim · model-written summary
In choice experiments Pameridea strongly preferred its carnivorous host plant Roridula over unrelated host plants.
Pameridea
RoridulaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In choice experiments, the hemipteran (Pameridea) has a strong preference for its carnivorous host plant (Roridula) above unrelated host plants”
Claim · model-written summary
Pameridea also preferred its host plant species over the closely related sister plant species.
- Interactor
- host speciese0host
- Outcome
- prefers its host speciese0
- Comparator
- its closely related sister speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pameridea also prefers its host species to its closely related sister species”
Claim · model-written summary
Pameridea showed no intraspecific preference for plants from its natal populations over plants from isolated, non-natal populations.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pameridea does not exhibit intraspecific preferences toward plants from their natal populations above plants from isolated, non-natal populations”
Claim · model-written summary
Because Roridula and Pameridea differ in scale of gene flow, adaptation at the local population level is judged unlikely.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Because Roridula and Pameridea have different scales of gene flow, adaptation at the local population level is unlikely”
Claim · model-written summary
The restricted gene flow of both plants and hemipterans could enable adaptation at a regional level.
Verbatim
e0“the restricted gene flow of both plants and hemipterans could enable adaptation to occur at a regional level”
Claim · model-written summary
Specialization at the species level is likely to reinforce cospeciation processes in this mutualism.
Not reportedTaxon
Verbatim
e0“Specialization at the specific level is likely to reinforce cospeciation processes in this mutualism”