Are stable isotopes an efficient tool for tracking the effect of anthropogenic activities on mangrove food web structure and function?

Medina-Contreras, Diana; Arenas, Fernando

doi:10.1007/s10750-022-05086-2

Cited by 4 publications

(1 citation statement)

References 36 publications

(116 reference statements)

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“…Incorporation of 15 N-enriched nitrogenous ions leads to generally higher values of 15 N ratio (δ 15 N) in terrestrial and aquatic plants [25,[29][30][31][32]. Hence, foliar δ 15 N composition of coastal plants have been using as useful indicator for assessing the differences between pristine and anthropogenically impacted ecosystems [22][23][24][25]27,[29][30][31][32][33][34][35][36]. However, such an assessment is not sufficient to understand the degree of changes in anthropogenically impacted mangroves from the natural condition.…”

Section: Introductionmentioning

confidence: 99%

An Assessment of Mangrove Ecosystem Condition by Foliar Stable Nitrogen Isotope Ratio Index in Okinawa, Japan

Tanu,

Hinokidani,

Asakura

et al. 2023

IJPSS

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Despite providing valuable ecosystem services, mangroves are endangered under the recent global natural as well as anthropogenic changes. Conservation of mangroves is now one of the pillars of Sustainable Development Goals (SDG) 2030. An assessment of mangrove is essential before initializing any conservation strategy. This paper aimed to assess the ecosystem conditions of mangroves and the relative changes in ecosystem conditions from the natural background under different scales of anthropogenic interruption in Okinawa Prefecture, Japan. To assess mangrove’s ecosystem condition, foliar stable nitrogen isotope ratio (δ15N) of mangroves is used as ecosystem monitoring indicator. Whereas, a difference index (DI) of mangrove foliar δ15N is established to compare the relative deviation in ecosystem conditions of anthropogenically impacted mangroves from reference mangroves. Results showed that the mean foliar δ15N values of Bruguiera gymnorrhiza, Kandelia obovata, and Rhizophora stylosa on Okinawa Island (Is.) are 5.12 ± 2.32‰, 7.54 ± 2.85‰ and 7.09 ± 3.29‰, respectively, on Iriomote Is., 1.83 ± 1.93‰, 2.01 ± 0.31‰ and 1.04 ± 2.38‰, respectively, and on Ishigaki Is., foliar δ15N values of Bruguiera gymnorrhiza and Rhizophora stylosa are 5.23 ± 3.33‰ and 6.00 ± 3.63‰, respectively. A range of negative to positive values from -0.54 to 3.66 of DI indicates different level of changes in ecosystem conditions of the mangroves compared to the reference sites, which is set at zero. A significant negative correlation between DI values and the forest area ratio of the watersheds has been observed. It indicates that the forest cover is the driver of maintaining pristine condition of an ecosystem. Findings of the study recommended that Todoroki and Manko mangrove watersheds in Okinawa, Japan should be taken into consideration for necessary conservation on priority basis.

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Section: Introductionmentioning

confidence: 99%

An Assessment of Mangrove Ecosystem Condition by Foliar Stable Nitrogen Isotope Ratio Index in Okinawa, Japan

Tanu,

Hinokidani,

Asakura

et al. 2023

IJPSS

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Preface: Emerging trends in aquatic ecology IV

et al. 2023

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Our understanding of aquatic ecology and ecosystem functioning continuously improves. The special issues of Hydrobiologia on "Emerging Trends in Aquatic Ecology" each represent a collection of papers to testify to the variety of approaches and topics that concur in reaching the common aim to scientifically underpin political and societal decisions to mitigate our impacts on our planet and its biodiversity.The series started exactly 100 volumes ago, with volume 750 in 2015 (Martens, 2015). We here proudly present the fourth edition of the series, with papers from colleagues within and outside of the editorial board of the journal.The current trend of continuous biodiversity loss resulted in several international and national regulations and funding schemes to target biodiversity protection and halt its loss. Such a trend is clearly reflected in the papers published in this special issue, which now, more than in the previous editions of the ETAE (Naselli-Flores et al., 2017;Thomaz et al., 2020), present studies that improve our basic understanding of the patterns and processes in biodiversity, that introduce and review state-of-the-art tools and approaches to study biodiversity, that use biodiversity to monitor and assess ecological quality of waters, and that study the effects of anthropogenic activities and climate change on aquatic biodiversity.Three papers deal with the distribution of species. They addressed the influence of abiotic processes like floodings on species occurrence and interactions in plants in the Amazons (da Silva et al., 2023), the role of dried aquatic macrophytes in dispersal of Neotropical ostracods (Rosa et al., 2023), and potential biases affecting our understanding of biodiversity and biogeography of microscopic aquatic organisms (Marrone et al., 2023 provide advice on the use of different literature databases when searching for literature surveys on topics in aquatic ecology, given

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Trophic niches of estuarine fish and evidence of mangrove-fishery causal links in the Southern Caribbean (Colombia)

Sandoval,

Erős

2024

Hydrobiologia

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The trophic organization of estuarine fish communities is poorly known. We used Stable Isotopes (δ13C and δ15N) to classify the most abundant fishes of the Atrato River Delta (Colombia) into trophic guilds. We examined trophic niches and the relationships between the abundance of the trophic guilds (catch per unit effort) and environmental variables. The zoobenthivores were the dominant trophic guild. The isotopic niche width, based on Bayesian estimate of the standard ellipse areas, was more significant for carnivores (25.3‰2) and planktivores (24.4‰2) than for omnivores (7.8‰2) and phytobenthivores (3.1‰2). The overlap combinations showed a medium probability of isotopic overlap (≈50%) between carnivores and planktivores and between carnivores and omnivores. Isotopic niche size and overlap suggested diversity in food sources and considerable niche segregation of the fish community. Mangrove area was the main factor explaining the abundance of omnivores and zoobenthivores, supporting that the causal links between mangrove habitat and local fishery production may be explained through the trophic contribution of mangroves and mangrove-related sources. The results underscore the importance of mangrove areas in the trophic organization of fish communities and can inform strategies aimed at managing the ecosystem impacts of fishing and protecting extensive mangrove areas in the southern Caribbean.

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Are stable isotopes an efficient tool for tracking the effect of anthropogenic activities on mangrove food web structure and function?

Cited by 4 publications

References 36 publications

An Assessment of Mangrove Ecosystem Condition by Foliar Stable Nitrogen Isotope Ratio Index in Okinawa, Japan

An Assessment of Mangrove Ecosystem Condition by Foliar Stable Nitrogen Isotope Ratio Index in Okinawa, Japan

Preface: Emerging trends in aquatic ecology IV

Trophic niches of estuarine fish and evidence of mangrove-fishery causal links in the Southern Caribbean (Colombia)

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