Recherches sur les peuplements a dominance d'anthozoaires dans les recifs coralliens de Tulear

Pichon, Michel

doi:10.5479/si.00775630.222.1

Cited by 89 publications

(126 citation statements)

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“…Whereas summer blooms of canopy-forming macroalgae (Sargassum spp., Turbinaria spp.) were already reported on inner reef flats in the 1960s (Pichon 1978), hard substrates are now dominated by macroalgae at all times of year. In summer, the canopy-forming species S. latifolium and T. ornata reach 70% cover, and in winter foliose algae (Ulva sp., Padina sp.)…”

Section: Algal Cover and Communitiesmentioning

confidence: 97%

“…These habitats were formerly described as "reef flat with transverse strips" (Fig. 1, zone "A"), "reef flat with scattered coral growth," and "compact reef flat" (Clausade et al 1971) and reported as dominated by living corals in the late 1960s (Pichon 1978). Between 1962 and 2011, the loss of transverse coral strips ranged from 80% to 40% depending on location (Andréfouët et al, accepted).…”

Section: Changes In Reef Statementioning

confidence: 99%

“…1) and represents approximately 33 km² of structurally diverse shallow reef area. This reef system was studied intensively by French scientists between 1961 and 1972, focusing mainly on reef morphology (Clausade et al 1971) and on the inventory and distribution of flora and fauna -in particular key taxa such as corals (Pichon 1978) and fish (Harmelin-Vivien 1979). Over 6000 species were identified (B. Thomassin, personal communication), still the highest biodiversity recorded for an Indian Ocean reef system.…”

Section: Study Site and Socioeconomic Contextmentioning

confidence: 99%

“…In 2008, additional coral cores were drilled from the GRT lagoon to reconstruct the Ba/Ca ratios, a proxy of sediment runoff from terrestrial discharge (McCulloch et al 2003), with laser-ablation ICP-MS at the Max-Planck-Institut für Chemie in Mainz (Germany) following the method of Mertz-Kraus et al (2009). Flow regimes, nutrients, pigments, and suspended matter were monitored weekly in and outside the GRT lagoon from January 2007 to November 2008 (Arfi et al 2007(Arfi et al , 2008 (Pichon 1978, Harmelin-Vivien 1979.…”

Section: Study Site and Socioeconomic Contextmentioning

confidence: 99%

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Wicked Social-Ecological Problems Forcing Unprecedented Change on the Latitudinal Margins of Coral Reefs: the Case of Southwest Madagascar

Bruggemann¹,

Rodier²,

Guillaume³

et al. 2012

E&S

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ABSTRACT. High-latitude coral reefs may be a refuge and area of reef expansion under climate change. As these locations are expected to become dryer and as livestock and agricultural yields decline, coastal populations may become increasingly dependent on marine resources. To evaluate this social-ecological conundrum, we examined the Grand Récif of Toliara (GRT), southwest Madagascar, which was intensively studied in the 1960s and has been highly degraded since the 1980s. We analyzed the social and ecological published and unpublished literature on this region and provide new data to assess the magnitude of the changes and evaluate the causes of reef degradation. Top-down controls were identified as the major drivers: human population growth and migrations, overfishing, and climate change, specifically decreased rainfall and rising temperature. Water quality has not changed since originally studied, and bottom-up control was ruled out. The identified network of social-ecological processes acting at different scales implies that decision makers will face complex problems that are linked to broader social, economic, and policy issues. This characterizes wicked problems, which are often dealt with by partial solutions that are exploratory and include inputs from various stakeholders along with information sharing, knowledge synthesis, and trust building. A hybrid approach based on classical fishery management options and preferences, along with monitoring, feedback and forums for searching solutions, could move the process of adaptation forward once an adaptive and appropriately scaled governance system is functioning. This approach has broad implications for resources management given the emerging climate change and multiple social and environmental stresses.

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Section: Algal Cover and Communitiesmentioning

confidence: 97%

Section: Changes In Reef Statementioning

confidence: 99%

Section: Study Site and Socioeconomic Contextmentioning

confidence: 99%

Section: Study Site and Socioeconomic Contextmentioning

confidence: 99%

See 2 more Smart Citations

Wicked Social-Ecological Problems Forcing Unprecedented Change on the Latitudinal Margins of Coral Reefs: the Case of Southwest Madagascar

Bruggemann¹,

Rodier²,

Guillaume³

et al. 2012

E&S

Self Cite

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show abstract

“…However, fungiid corals traditionally were thought to be ahermatypic (Chadwick 1988;Hoeksema 1989); i.e., not known to produce enduring reef formations by themselves. Free-living members of Fungiidae frequently occur in large aggregations (Pichon 1978), but the size and geological history of the bioherm described here provides an unprecedented record of coral reef formation by this group.…”

Section: Introductionmentioning

confidence: 99%

A unique coral reef formation discovered on the Great Astrolabe Reef, Fiji

Littler

Brooks

et al. 1997

Coral Reefs

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Abstract. A spectacular mound-like reef formation (126 m in circumference, 10 m high) dominated by highly arched and record-size colonies of the unattached mushroom coral Halomitra pileus, along with 17 other species of the family Fungiidae, occurs in 31 m of water on the sedimentary lagoon floor of the Great Astrolabe Reef, Fiji. Core samples show radiocarbon dates which indicate that the formation hypothetically began building &4500 y ago, with a calculated mean accretion rate of 2.2 mm · y\ . The majority of fossil and living material is contributed by H. pileus colonies between 40-70 cm mean diameter, with some individuals up to 1.5 m in diameter. The size, fungiid diversity, and geological history of the bioherm is unprecedented and represents the first example of a coral reef constructed almost entirely by Fungiidae.

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Reef Fish Community Structure: An Indo-Pacific Comparison

Harmelin-Vivien¹

1989

Ecological Studies

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Recherches sur les peuplements a dominance d'anthozoaires dans les recifs coralliens de Tulear

Cited by 89 publications

References 0 publications

Wicked Social-Ecological Problems Forcing Unprecedented Change on the Latitudinal Margins of Coral Reefs: the Case of Southwest Madagascar

Wicked Social-Ecological Problems Forcing Unprecedented Change on the Latitudinal Margins of Coral Reefs: the Case of Southwest Madagascar

A unique coral reef formation discovered on the Great Astrolabe Reef, Fiji

Reef Fish Community Structure: An Indo-Pacific Comparison

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