Journal
MARINE ECOLOGY PROGRESS SERIES
Volume 532, Issue -, Pages 41-57Publisher
INTER-RESEARCH
DOI: 10.3354/meps11344
Keywords
Epilithic algal matrix; Spatial variability; Algal assemblage; Patchiness; Hierarchical analysis
Categories
Funding
- National Science Foundation IGERT grant [0903551]
- Wyer Family fellowship
- Charles H. Stout Foundation fellowship
- Direct For Education and Human Resources
- Division Of Graduate Education [0903551] Funding Source: National Science Foundation
Ask authors/readers for more resources
Quantifying variability over multiple spatial scales is a fundamental goal in ecology, providing insight into which scale-dependent processes most strongly influence community structure. On coral reefs, the ubiquitous turf algae are the primary food source for herbivores and competitors for space with corals. Turf algae will likely increase in the future, because they thrive under conditions that reduce coral cover. Turfs are typically treated as a single homogeneous functional group, but analyzing them as a variable assemblage is more informative. We used a hierarchical sampling design to quantify 4 scales of variability in turf assemblages from centimeters (within single dead coral heads) to kilometers (across islands) on the rarely studied Lhaviyani Atoll, Maldives. We used 4 metrics, each reflecting different ecological processes: percent cover, canopy height, richness, and assemblage composition. For most of these metrics, variability was significant at multiple spatial scales. However, for all metrics, the smallest scale (centimeters) explained the greatest proportion of overall variability. The least variability in cover, canopy height, and richness occurred among sites (100s meters), suggesting that processes such as competition, predation, and vegetative growth are heterogeneous at small scales. In contrast, assemblage composition was least variable at the largest scale (kilometers), suggesting that oceanographic processes or a well-mixed propagule supply reduce variability. With declining coral and increasing cover of turf on reefs worldwide, it will become increasingly important to understand the dynamics of coral-turf competitive interactions. However, because turf assemblages are highly variable at small spatial scales, these interactions require more detailed consideration.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available