Selective consumption of macroalgal species by herbivorous fishes suggests reduced functional complementarity on a fringing reef in Moorea, French Polynesia

2021 ◽  
Vol 536 ◽  
pp. 151508
Author(s):  
Shayna A. Sura ◽  
Nury E. Molina ◽  
Daniel T. Blumstein ◽  
Peggy Fong
Keyword(s):  
French Polynesia ◽  
Herbivorous Fishes ◽  
Macroalgal Species ◽  
Fringing Reef ◽  
Functional Complementarity

scholarly journals Evidence against a mechanism of allelopathy in the green alga Chlorodesmis fastigiata

2017 ◽  
Author(s):  
William E Kumler
Keyword(s):  
Green Alga ◽  
French Polynesia ◽  
Small Samples ◽  
Negative Effects ◽  
Toxic Compounds ◽  
Macroalgal Species

Allelopathic macroalgae have been shown to have significant negative effects on corals via the transfer of toxic compounds. The interaction that takes place between allelopathic macroalgae and other algae, however, has not been studied in detail. Here, the effects of the allelopathic Chlorodesmis fastigiata on other macroalgae were analyzed. These effects were first tested on complete coral and macroalgal individuals over several days, then on small samples of the macroalgal species when exposed to isolated toxins. However, neither experiment found significant negative effects on either Sargassum mangarevense or Boodlea kaeneana due to the interaction between these algae and the toxin produced by C. fastigiata. Distribution and abundance of C. fastigiata was also assessed around the island of Moorea in French Polynesia.

scholarly journals Cryptofaunal diversity in fringing reef rhodoliths

Coral Reefs ◽  
2021 ◽  
Author(s):  
Mira Abrecht ◽  
Viktor Nunes Peinemann ◽  
Ara Kevork Yazaryan ◽  
Madeline Kestler ◽  
Braden Charles DeMattei ◽  
...  
Keyword(s):  
French Polynesia ◽  
Decapod Crustaceans ◽  
Critical Determinant ◽  
Fringing Reef ◽  
North Shore ◽  
Preferred Habitat ◽  
Fringing Reefs ◽  
Wide Range

AbstractRhodolith distribution, morphology, and cryptofauna have been minimally studied on fringing reefs. We present the first study to examine both rhodolith distribution and associated cryptofauna in a tropical fringing reef, located along the microtidal, wave-dominated north shore of Moorea, French Polynesia. We find higher abundances of larger, rounder, and more branching rhodoliths in locations where longer waves impact the fringing reef. Among 1879 animals extracted and identified from 145 rhodoliths, ophiuroids, polychaetes, decapod crustaceans, and gastropods are most abundant, with a wide range of additional taxa contributing to diversity. Large and branching rhodoliths contain the greatest number and diversity of cryptofaunal organisms and are the preferred habitat of rigid-bodied, non-burrowing forms. Overall, exposure to waves entering the lagoon through passes appears to be a critical determinant of rhodolith abundance, morphotype, and in turn cryptofaunal composition in fringing reef habitats.

scholarly journals Distribution and biological implications of plastic pollution on the fringing reef of Mo’orea, French Polynesia

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3733 ◽  
Author(s):  
Elizabeth J. Connors
Keyword(s):  
Coral Reef ◽  
South Pacific ◽  
French Polynesia ◽  
The South ◽  
Plastic Pollution ◽  
Fringing Reef ◽  
Coral Reef Ecosystems ◽  
Oceanic Gyres ◽  
First Time ◽  
Negatively Buoyant

Coral reef ecosystems of the South Pacific are extremely vulnerable to plastic pollution from oceanic gyres and land-based sources. To describe the extent and impact of plastic pollution, the distribution of both macro- (>5 mm) and microplastic (plastic < 5 mm) of the fringing reef of an isolated South Pacific island, Mo’orea, French Polynesia was quantified. Macroplastic was found on every beach on the island that was surveyed. The distribution of this plastic was categorized by site type and by the presence of Turbinaria ornata, a common macroalgae on Mo’orea. Microplastics were discovered in the water column of the fringing reef of the island, at a concentration of 0.74 pieces m−2. Additionally, this study reports for the first time the ingestion of microplastic by the corallimorpha Discosoma nummiforme. Microplastics were made available to corallimorph polyps in a laboratory setting over the course of 108 h. Positively and negatively buoyant microplastics were ingested, and a microplastic particle that was not experimentally introduced was also discovered in the stomach cavity of one organism. This study indicates that plastic pollution has the potential to negatively impact coral reef ecosystems of the South Pacific, and warrants further study to explore the broader potential impacts of plastic pollution on coral reef ecosystems.

scholarly journals MACROALGAS DEL BANCO DE LAS ANIMAS Y NUEVOS REGISTROS PARA EL CARIBE COLOMBIANO

2016 ◽  
Vol 24 ◽  
Author(s):  
Germán Bula Meyer ◽  
Guillermo Díaz Pulido
Keyword(s):  
Coral Reefs ◽  
Green Alga ◽  
National Park ◽  
New Records ◽  
Caribbean Coast ◽  
Herbivorous Fishes ◽  
Macroalgal Species ◽  
The Caribbean ◽  
The One ◽  
First Time

Forty nine macroalgal species (7 Chlorophyta, 4 Phaeophyta and 38 Rhodophyta) are reported for the first time for the Banco de las Animas, at the southwest of Santa Marta City (Salamanca Gulf, Colombia). The collections were made between 20 and 30 m depth. The green alga Halimeda gracilis Harvey ex J. Agardh and the red ones Corynomorpha clavata (Harvey) J. Agardh, Cryptonemia sp., Acrothamnion butleriae (Collins) Kylin, Antithamnion ogdeniae Abbott, Antithamnionella breviramosa (Dawson) Wollaston in Womersley and Bailey, Hypoglossum simulans Wynne, Price et Ballantine and H. subsimplex Wynne, are new records for the Caribbean coast of Colombia. Thefloristiccompositionof thebankhasasimilarityof 81 % with the one present at the same depths in the Tairona Natural National Park. Due to this characteristic and to the exuberance of certain species, the Banco de las Animas is considered a refuge, in which these plants avoid the herbivorous fishes and urchins of the shallow rock-coral reefs.

scholarly journals Sponge Physioecology On Moorea, French Polynesia: Local Distribution And Filtration Efficiency Of Lamellodysidea Under Varying Temperatures

2020 ◽  
Author(s):  
Lily Leveque-Eichhorn
Keyword(s):  
Ecological Study ◽  
Physiological Function ◽  
French Polynesia ◽  
Filtration Efficiency ◽  
Barrier Reef ◽  
Local Distribution ◽  
Fringing Reef ◽  
Physiological Tolerances ◽  
Filter Feeders ◽  
Temperature Impacts

AbstractThis physio-ecological study investigated the physiology and distribution of Lamellodysidea sp. in Moorea, French Polynesia. Specifically, its distribution was described across three reef types—fringing, mid-barrier, and barrier reefs—as well as across sites between Cook’s Bay and Opunohu Bay. Additionally, filtration experiments were conducted to test how temperature impacts filtration efficiency. This is informative when predicting how future ocean temperatures are going to affect sponge’s success and distribution. Sponge abundance was found to decrease from the fringing reef out to the barrier reef, with the highest number of sponges in the fringing reef, less in the mid-barrier reef, and none found in the barrier reef. Sponges were also unevenly distributed across sites, with sponge abundance clearly increasing as you move away from Cook’s Bay. Together, these data show that sponges demonstrate habitat preference that is related to their physiological tolerances. Filtration data showed that over a 3-hour period sponges increase their physiological output when introduced to environments 3-6 degrees Celsius above normal. This suggests that as ocean temperatures warm, sponges are likely to increase their filtration efficiency, thus increasing their ecological role as filter feeders, or struggle to survive at this new level of physiological function.

scholarly journals Evidence against a mechanism of allelopathy in the green alga Chlorodesmis fastigiata

2017 ◽  
Author(s):  
William E Kumler
Keyword(s):  
Green Alga ◽  
French Polynesia ◽  
Small Samples ◽  
Negative Effects ◽  
Toxic Compounds ◽  
Macroalgal Species

Allelopathic macroalgae have been shown to have significant negative effects on corals via the transfer of toxic compounds. The interaction that takes place between allelopathic macroalgae and other algae, however, has not been studied in detail. Here, the effects of the allelopathic Chlorodesmis fastigiata on other macroalgae were analyzed. These effects were first tested on complete coral and macroalgal individuals over several days, then on small samples of the macroalgal species when exposed to isolated toxins. However, neither experiment found significant negative effects on either Sargassum mangarevense or Boodlea kaeneana due to the interaction between these algae and the toxin produced by C. fastigiata. Distribution and abundance of C. fastigiata was also assessed around the island of Moorea in French Polynesia.

scholarly journals Distribution and biological implications of plastic pollution on the fringing reef of Mo’orea, French Polynesia

2017 ◽  
Author(s):  
Elizabeth Janice Connors
Keyword(s):  
Coral Reef ◽  
Soft Coral ◽  
French Polynesia ◽  
Plastic Pollution ◽  
Reef Environment ◽  
Fringing Reef ◽  
Coral Reef Environment ◽  
Time Frames ◽  
The Impact ◽  
First Time

Plastic pollution has been recognized as a major pollutant of the open ocean, but the extent and impact of plastic pollution on the coral reef environment has yet to be fully understood. In this study, the distribution of both macro- (>5mm) and micro- plastic (<5mm) of a typical coral reef ecosystem— the fringing reef of an isolated South Pacific island, Mo’orea, French Polynesia—was quantified. During the course of the study, macroplastic was found on every beach on the island, and distribution of plastic was categorized by site type and the presence of Turbinaria oranata, a common macroalgae of Mo’orea. Microplastic (plastic pieces <5mm) was found in the water column of the fringing reef of the island, at a concentration of 0.74 plastic pieces per square meter. To test the impact on coral reef organisms of the plastic pollution found in the fringing reef, microplastic was exposed to a species of soft coral, Discosoma spp.in a laboratory setting. The resilience of Discosoma spp.in fluctuating temperatures and rising CO2 levels is well understood, but the effect of plastic pollution on Discosoma spp. and other corallimorphs has never before been analyzed. This study reports for the first time the ingestion of microplastic by the soft coral Discosoma spp. Positively buoyant and negatively buoyant microplastic were both ingested over different time frames. In addition, wild (not experimentally introduced) microplastic was found in the stomach cavity of the organism. These findings indicate that plastic debris are being ingested by Discosoma spp. and may impair the health of this prevalent coral reef organism.

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