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Influence of dead coral substrate morphology on patterns of juvenile coral distribution
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2007 (English)In: Marine Biology, ISSN 0025-3162, Vol. 150, no 6, 1145-1152 p.Article in journal (Refereed) Published
Abstract [en]

This study examines the abundances of three morphological categories of juvenile corals (massive, branching and encrusting) on two different types of natural substratum, dead massive and dead branching corals. The overall results show that the morphological characteristics of dead coral substratum have a significant influence on the coral recruitment patterns with respect to the morphology of the recruits: juvenile corals of massive and branching types were more abundant on substrates of corresponding morphology. The results obtained from this study suggest that dead coral might attract coral larvae that are morphologically similar. On the other hand, it may be the result of post-settlement mortality. Whatever the mechanism shaping the patterns is, it seems that the physical morphology of the dead coral substrate has a significant influence on the coral recruit assemblage. Hence, we suggest that substrate morphology can be an important qualitative factor for coral settlement and a possible determinant of community structure.

Place, publisher, year, edition, pages
2007. Vol. 150, no 6, 1145-1152 p.
URN: urn:nbn:se:su:diva-10877DOI: 10.1007/s00227-006-0458-2ISI: 000244454900010OAI: diva2:177396
Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2010-01-07Bibliographically approved
In thesis
1. Upholding the coral loop: Resilience, alternative stable states and feedbacks in coral reefs
Open this publication in new window or tab >>Upholding the coral loop: Resilience, alternative stable states and feedbacks in coral reefs
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Coral reefs are suffering unprecedented declines in coral cover and species diversity. These changes are often associated with  substantial shifts in community structure to new dominant organisms. Ultimately, these “phase shifts” can be persistent and very difficult to return from. Building insurance against degradation and decreasing the likelihood of reefs undergoing shifts to undesirable states will require sustainable management practices that uphold coral reef resilience. This thesis consists of five papers that contribute new knowledge useful for managing the resilience of coral reefs, and other marine ecosystems. Paper I shows how the morphology of natural substrate (dead coral colonies) can significantly influence coral recruitment patterns. Paper II focuses on larval lipid levels, a key determinant of coral dispersal potential, in a common Caribbean coral (Favia fragum). It shows that i) lipid levels exhibit a significant, non-linear reduction throughout the larval release period of F. fragum and ii) exposure to a common pollutant (copper) could potentially lead to a more rapid lipid consumption in the larvae. Paper III presents a broader analysis of the different undesirable states a coral reef can shift to as a consequence of reef degradation. It concludes that different states are caused by different driving factors and that management must explicitly acknowledge this. Paper IV proposes a suite of resilience indicators that can help managers assess when a coral-dominated reef might be moving towards a shift to an undesirable state. These indicators capture key-processes occuring on different temporal and spatial scales and signal resilience loss early enough for managers to take appropriate measures. Finally, Paper V reviews the feedback loops that reinforce the undesirable states of five important marine ecosystems and suggests certain strategies that can ease the restoration back to healthier conditions. Managing these critical feedbacks will recquire monitoring the processes underpinning these feedbacks, breaking already established feedbacks loops through large-scale management trials and acknowledging transdisciplinary solutions that move management beyond the discipline of ecology

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2010. 39 p.
resilience, alternative stable states, regimes, feedbacks, recruitment, coral reefs, marine ecosystem management, regime shifts, phase shifts
National Category
Research subject
Natural Resources Management
urn:nbn:se:su:diva-34037 (URN)978-91-7155-997-5 (ISBN)
Public defence
2010-01-29, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 09:00 (English)
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 5: In progress.Available from: 2010-01-07 Created: 2010-01-04 Last updated: 2010-01-07Bibliographically approved

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Norström, AlbertLokrantz, JerkerNyström, Magnus
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