Ecological Consequences Of Relatedness: The Role Of Competition And Herbivory In The Community Structure Of Co-Occurring Asteraceae
Bibliographic record
Abstract
Species interactions, such as competition and herbivory, are believed to be important structuring forces in plant communities. As a proxy for species similarity, the degree of relatedness among species may influence the intensity and outcomes of these interactions. In my dissertation research, I examined whether relatedness influenced the relative importance of plant competition and insect herbivory, and their feedbacks, in structuring the local community of closely related Asteraceae. Focusing on seven common, co-occurring, old-field species (genus Solidago, Symphyotrichum, and Euthamia), I tested the long-standing hypothesis that competition between close relatives is stronger than among more distantly related taxa. I also examined the effects of plant community structure on herbivory by a specialist outbreaking herbivore (Trirhabda virgata), and, in turn, the impacts of herbivory on plant competitive dynamics and community structure. Relatedness was not a reliable predictor of the intensity of competition among the focal species. Outcomes of pairwise competition between close and more distant relatives did not differ in a shortterm greenhouse experiment. Over three years, community productivity and growth of individual species were comparable in field mesocosms containing closely related species or mixtures of more distantly related taxa, in spite of clear differences in competitive abilities among species. However, communities of close relatives experienced greater invasion by other old-field species, highlighting the role of relatedness and competition in broader plant community structure. Community relatedness also determined the extent of damage by Trirhabda, which reflected the insect's host preference hierarchy. Specifically, the preferred genus (Solidago) suffered greater herbivory when growing in mixtures with the less preferred genus (Symphyotrichum) than when growing alone; the opposite pattern was observed for Symphyotrichum. In spite of differential damage, herbivory did not lead to a shift in the competitive abilities or community structure of the focal species compared to communities protected from herbivores; however, insect herbivores promoted invasion of the communities by other old-field species. In summary, my research reveals the consequences of species relatedness in trophic interactions between plants and herbivores, but not directly in plant competition, and underscores the potential feedbacks between plant community structure and herbivory over longer time scales.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".