Regional consistency of intertidal elevation as a mediator of seaweed canopy effects on benthic species richness, diversity, and composition
Bibliographic record
Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 491:91-99 (2013) - DOI: https://doi.org/10.3354/meps10521 Regional consistency of intertidal elevation as a mediator of seaweed canopy effects on benthic species richness, diversity, and composition Cortney A. Watt1,2, Ricardo A. Scrosati1,* 1Saint Francis Xavier University, Department of Biology, Antigonish, Nova Scotia B2G 2W5, Canada 2Present address: University of Manitoba, Department of Biological Sciences, Winnipeg, Manitoba R3T 2N2, Canada *Corresponding author. Email: rscrosat@stfx.ca ABSTRACT: Through a regional-scale study, we tested the hypothesis that seaweed canopies affect benthic species richness, diversity, and composition differently depending on intertidal elevation. The theory behind that prediction recognizes that macroalgal canopies (composed mainly of Ascophyllum nodosum and secondarily of Fucus spp. on the studied shores) limit temperature and desiccation stresses in understory habitats during low tides at high and intermediate elevations but have little influence at low elevations because of prolonged submergences due to tide dynamics. We measured the abundance of all benthic algae and invertebrates in 1033 quadrats covering the natural range of fucoid canopy cover at high, middle, and low elevations in wave-sheltered rocky intertidal sites spanning 350 km of coast in Atlantic Canada. Univariate and multivariate analyses indicated that benthic species richness, diversity, and composition differed significantly between low-cover (0-40%) and high-cover (60-100%) canopy treatments at high and middle elevations but not at low elevations. At high and middle elevations, high canopy cover increased benthic richness and diversity by allowing several species to occur and enhancing the abundance of most species, compared with low canopy cover. At low elevations, species generally occurred in both canopy treatments and showed a similar abundance between them. These results reveal the ecological generality of the dependency of canopy effects on elevation, which we previously found through a manipulative experiment done at one location. Overall, we conclude that environmental stress mediates seaweed canopy effects on the structure of intertidal communities. KEY WORDS: Ascophyllum · Canopy · Environmental stress · Fucus · Intertidal · Seaweed · Species diversity · Understory Full text in pdf format PreviousNextCite this article as: Watt CA, Scrosati RA (2013) Regional consistency of intertidal elevation as a mediator of seaweed canopy effects on benthic species richness, diversity, and composition. Mar Ecol Prog Ser 491:91-99. https://doi.org/10.3354/meps10521 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 491. Online publication date: October 02, 2013 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2013 Inter-Research.
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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 | 0.002 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".