Mapping anthropogenic nitrogen through point sources in coral reefs using δ15N in macroalgae

Lin, Hsing‐Juh; Wu, C.; Kao, Shuh‐Ji; Kao, Wen‐Yuan; Meng, Pei‐Jie

doi:10.3354/meps335095

Cited by 44 publications

(29 citation statements)

References 29 publications

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“…Similar trends have been reported in other regions of the world, such as French Polynesia [3], Australia [9][10][11], Taiwan [12], and the Baltic Sea [13]. However, most of these studies dealt with sewage outfalls [10][11][12][13], river water [8,11], groundwater seepage [8], and/or effluents from inshore shrimp farms [3,9,11] as nitrogen loading sources. In some studies, nitrogen loading was determined using seagrasses inhabiting muddy to sandy substrata as nitrogen indicators by analyzing their d 15 N [11,14,15].…”

Section: Introductionsupporting

confidence: 52%

Difference in the stable nitrogen isotope ratio of Sargassum piluliferum (Phaeophyceae: Fucales) associated with fish and pearl oyster aquaculture facilities

et al. 2009

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In order to estimate the nitrogen loading from fish aquaculture facilities, we studied the nitrogen and carbon stable isotope ratios (d 15 N and d 13 C, respectively) in the brown macroalga Sargassum piluliferum and small amphipod crustaceans Caprella spp., both of which are lower trophic level biota found at fish and pearl oyster aquaculture facilities situated along the eastern coast of the Uwa Sea, Japan. This coastal region is one of the least populated areas along the Japanese coast. The mean concentrations of chlorophyll a, dissolved inorganic nitrogen, dissolved inorganic phosphate, and dissolved silicate-Si were 1.5-to 2-fold higher in samples from the fish aquaculture facilities than in those from the pearl oyster aquaculture facilities, indicating that the fish aquaculture facilities were associated with nitrogen loading. The d 15 N abundance level in S. piluliferum collected from the fish aquaculture facilities was significantly higher (1.3%) than that in macroalga collected at the pearl oyster aquaculture facilities, whereas that in Caprella spp., primary consumers, was only slightly higher (0.3%). The feeding style of Caprella spp., which depends on suspended particulate organic matter and attached microalgae, is considered to the primary causal factor for the lack of a significant difference in d 15 N abundance level between the two types of aquaculture facilities. Based on these results, we conclude that S. piluliferum found in close proximity of aquaculture facilities is a suitable organism for monitoring nitrogen loading from fish aquaculture facilities, through the analysis of d 15 N.

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Section: Introductionsupporting

confidence: 52%

Difference in the stable nitrogen isotope ratio of Sargassum piluliferum (Phaeophyceae: Fucales) associated with fish and pearl oyster aquaculture facilities

et al. 2009

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“…Macroalgae take up N from their environment with no evidence of N fractionation (Cohen and Fong, 2005), therefore their d 15 N values likely represent the integration of all available N sources. Macroalgae growing adjacent to sewage outfalls frequently have enriched d 15 N values ranging from 9 to 15% (Gartner et al, 2002;Costanzo et al, 2005;Lin et al, 2007). To date, the highest reported macroalgal d 15 N value is 50.1 % from samples of Ulva lactuca grown over warm, freshwater seeps on a nearshore reef at Kahekili on Maui (Dailer et al, 2010).…”

mentioning

confidence: 96%

“…Globally, over the past few decades, sources of anthropogenic N have been detected by investigating the isotopic signature of N ( 15 N: 14 N, expressed as d 15 N; Eq. 4) (Gartner et al, 2002;Costanzo et al, 2005;Lin et al, 2007;Risk et al, 2009;Dailer et al, 2010Dailer et al, , 2012. This is possible because different N sources have distinct d 15 N signatures.…”

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confidence: 96%

Responses of bloom forming and non-bloom forming macroalgae to nutrient enrichment in Hawai‘i, USA

Dailer

Smith

2012

Harmful Algae

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“…a high response degree of nitrogen isotopic signatures and touristic pressure). Similar isotopic values, associated with tourism, had been detected in surface sediments of eutrophic lakes [42] and in marine macroalgae [29], [43], [44], therefore providing a proxy of the effects of tourism on water bodies. 5 CONCLUSIONS Lake Bracciano already suffers from the effect of climate change and direct water extraction and our results indicated that, during the late summer season (July and August), the nonresidents anthropic pressure on Lake Bracciano shores rapidly increased, threatening the water healthiness and ecosystem health.…”

Section: Discussionmentioning

confidence: 67%

Lake Water Quality for Human Use and Tourism in Central Italy (Rome)

Calizza

Fiorentino

Careddu

et al. 2017

WIT Transactions on Ecology and the Environment

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The lakes in the Italian region of Lazio, and in particular Lake Bracciano, have suffered due to reduced rainfall during the most recent years (1264.8 mm in 2014 vs 308.4 mm in 2015 and 883.6 mm in 2016 in Lake Bracciano). Moreover, Lake Bracciano exhibits both a direct water withdrawal (as drinkable water for the city of Rome and several other towns), and an indirect one, by the groundwaters, for agriculture. The 1.5 m water reduction, never observed in the last two decades, bared over 10 m of the littoral zone with the consequent exposition of gravel shores, trashes and reduction of the bottom areas involved in the denitrification process. This condition poses a threat to the ecosystem and to the human profits in term of eutrophication, healthy water loss, ship handling difficulties, touristic boats included, and tourism decline. In a previous investigation, we sampled the epilithic algae in the littoral zone of Lake Bracciano and estimated their nitrogen isotopic signature (δ 15 N). We highlighted the presence of diffuse organic and inorganic nitrogen inputs not intercepted by the wastewater collection system. These inputs, in synergy with water-level reduction, are able to undermine the ecosystem structure and health. In this paper, we show the nitrogen isotopic signatures, and their sources, as euros gained by parking meters for non-residents. We highlight the role of the touristic pressure not intercepted by the wastewater treatment plant in terms of δ 15 N increase during the most critical season (i.e. summer). The results show strong increases of euros gained and consequent δ 15 N signature increases (9‰ < δ 15 N < 17‰) from the end of June to the middle of August. We provide evidence supporting the need to adopt management policies to preserve the ecosystem services and related human health and earnings.

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Mapping anthropogenic nitrogen through point sources in coral reefs using δ15N in macroalgae

Abstract: To trace anthropogenic N from sewage outfalls in coral reefs of Nanwan Bay, southern Taiwan, we analyzed tissue N, C/N ratio, and δ 15

Cited by 44 publications

References 29 publications

Difference in the stable nitrogen isotope ratio of Sargassum piluliferum (Phaeophyceae: Fucales) associated with fish and pearl oyster aquaculture facilities

Difference in the stable nitrogen isotope ratio of Sargassum piluliferum (Phaeophyceae: Fucales) associated with fish and pearl oyster aquaculture facilities

Responses of bloom forming and non-bloom forming macroalgae to nutrient enrichment in Hawai‘i, USA

Lake Water Quality for Human Use and Tourism in Central Italy (Rome)

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