Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean

Lambs, Luc; Mangion, Perrine; Mougin, E.; Fromard, François

doi:10.1002/rcm.7435

Cited by 11 publications

(8 citation statements)

References 20 publications

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“…Tropical coastal areas are typically characterized by rain water with δ 18 O of about -3 ± 1 ‰ (GNIP database) and the groundwater of several tropical coasts and islands reflect similar mean δ 18 O values (Lambs et al, 2016(Lambs et al, , 2018. This is also the case for the west coast of South India, with similar groundwater stable isotope ratios at Udupi (δ 18 O = -3.09 ± 0.05 ‰, n=34; Tripti et al, 2016).…”

Section: Rainfall Amount Effectmentioning

confidence: 61%

Evidence of elevation effect on stable isotopes of water along highlands of a humid tropical mountain belt (Western Ghats, India) experiencing monsoonal climate

Tripti

Lambs

Moussa

et al. 2019

Journal of Hydrology

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Rainfall Amount Effectmentioning

confidence: 61%

Evidence of elevation effect on stable isotopes of water along highlands of a humid tropical mountain belt (Western Ghats, India) experiencing monsoonal climate

Tripti

Lambs

Moussa

et al. 2019

Journal of Hydrology

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“…A narrow and shallow lagoon of about 7 km 2 extends far inland and opens to the sea over the northern reef flat ([ 41 ], Fig 1 ). Saltwater mangrove formations dominate the lagoon’s shoreline [ 42 ], while sandy beaches occur along its western shore.…”

Section: Methodsmentioning

confidence: 99%

Observations of sharks (Elasmobranchii) at Europa Island, a remote marine protected area important for shark conservation in the southern Mozambique Channel

Guillaume

Séret²

2021

PLoS ONE

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Sharks have declined worldwide and remote sanctuaries are becoming crucial for shark conservation. The southwest Indian Ocean is a hotspot of both terrestrial and marine biodiversity mostly impacted by anthropogenic damage. Sharks were observed during surveys performed from April to June 2013 in the virtually pristine coral reefs around Europa Island, a remote Marine Protected Area located in the southern Mozambique Channel. Observation events comprised 67 1-hour scientific dives between 5 – 35m depth and 7 snorkeling inspections, as well as 4 dinghy-based observations in the shallow lagoon. In a period of 24 days, 475 sharks were tallied. Carcharhinus galapagensis was most encountered and contributed 20% of the abundance during diving, followed by C. albimarginatus (10%). Both species were more abundant between 11-14h, and on the exposed sides of the island. Numbers of Sphyrna lewini were highest with 370 individuals windward and leeward, mostly schooling. S. lewini aggregations in the area are hypothesized to be attracted to the seamount archipelago offering favorable conditions for deep incursions and of which Europa Island forms part. C. amblyrhynchos, Galeocerdo cuvier and S. mokarran were uncommon, while there was an additional observation of Rhincodon typus. The lagoon of Europa was a nursery ground for C. melanopterus where it was the only species present. A total of 8 species was recorded, contributing to the shark diversity of 15 species reported from Europa since 1952 in the scientific and gray literature. Overall, with the occurrence of several species of apex predators in addition to that of R. typus, large schools of S. lewini, fair numbers of reef sharks and a nursery of C. melanopterus, Europa’s sharks constitute a significant reservoir of biodiversity, which contributes to preserve the functioning of the ecosystem. Our observations highlight the relevance of Europa Island for shark conservation and the need for shark-targeted management in the EEZ of both Europa and Bassas da India.

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“…However, foliar δ 15 N signature of the non-mangroves showed that they relied mostly on naturally originated N sources. Even though both mangroves and non-mangroves can use different sources of N from precipitation along with soil solution depending on micrometeorological conditions on sites [73][74][75][76][77], mangroves are capable of using alternate nutrient sources of groundwater, river water, and tidal seawater [78,79] accordingly due to their unique root systems, distribution along the water vicinity of the rivers, and salt-tolerant plant physiology. Despite being tactful to relatively higher N availability on human-affected sites, the non-mangroves showed negative to nearly zero values of foliar δ 15 N values.…”

Section: Foliar δ 15 N Of Mangroves and Non-mangroves Under Anthropogmentioning

confidence: 99%

Variation in Foliar ẟ15N Reflects Anthropogenic Nitrogen Absorption Potential of Mangrove Forests

Tanu

Asakura

Takahashi

et al. 2020

Forests

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Research Highlights: Mangrove forests are absorbing anthropogenically produced excess nitrogen under moderate to intensive human interaction in the study sites, further indicating the degree of deviation from the natural ecosystem condition. Background and Objectives: Mangrove species, when directly connected to anthropogenic activities such as sewage disposal, agricultural inputs, and receiving of animal manure, absorb excess nutrients from the systems and act as ecological indicators of long-term natural changes. However, there is a paucity of examples of how the mangroves respond to a land-use gradient comparing to the non-mangrove plants under indirect anthropogenic impacts. Materials and Methods: In this investigation, foliar total nitrogen (N), carbon to nitrogen (C/N) ratio, and δ15N of mangrove and non-mangrove species collected from 15 watersheds on three islands in Okinawa, Japan, have been compared. The land-use areas in the study watersheds were delineated by ArcGIS software, and the correlation between the foliar traits and the human-affected area ratios were examined. Results: Foliar δ15N of the mangroves, which was significantly different from those of the non-mangroves on each island, showed significantly higher values (5‰ to 14‰) in human-affected forests, whereas the values were up to 3‰ in pristine forests. Furthermore, the significant positive relationship between foliar nitrogenous traits and the human-affected area ratios suggested that the anthropogenic N might be regulating foliar N content and δ15N signature on the sites. Conclusion: Different degrees of foliar isotopic fractionation with the land-use gradient have clarified that mangroves can be a powerful tool for monitoring ecosystem conditions under anthropogenic disturbances.

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Water cycle and salinity dynamics in the mangrove forests of Europa and Juan de Nova Islands, southwest Indian Ocean

Cited by 11 publications

References 20 publications

Evidence of elevation effect on stable isotopes of water along highlands of a humid tropical mountain belt (Western Ghats, India) experiencing monsoonal climate

Evidence of elevation effect on stable isotopes of water along highlands of a humid tropical mountain belt (Western Ghats, India) experiencing monsoonal climate

Observations of sharks (Elasmobranchii) at Europa Island, a remote marine protected area important for shark conservation in the southern Mozambique Channel

Variation in Foliar ẟ15N Reflects Anthropogenic Nitrogen Absorption Potential of Mangrove Forests

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