Direct effects of ambient ammonia on the nitrogen isotope ratios of fish tissues

Moeri, Onour; Sternberg, Leonel da Silveira Lobo; Rodicio, Lenore Polo; Walsh, Patrick J.

doi:10.1016/s0022-0981(02)00446-x

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…Differences in magnitude of 15 N enrichment among organisms can occur (Gannes et al, 1997;Vander Zanden and Rasmussen, 2001;McCutchan et al, 2003), and the nitrogen isotope enrichment of juvenile A. japonica muscle tissue in continental waters of Japan compared to its diet were not found to correspond to the typical enrichment values (Kaifu et al, 2013). Differences in physiology (Moeri et al, 2003), water temperature (Bloomfield et al, 2011) and nutrient limitation (Aberle and Malzahn, 2007) may also affect isotopic ratios. We also removed the lipids from our leptocephalus samples to avoid bias due to shifts in the δ 13 C signature that are known to occur (Post et al, 2007), and leptocephali may have a lipid content of >10% of dry weight (Donnelly et al, 1995;Padron et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

Stable isotopic composition of anguilliform leptocephali and other food web components from west of the Mascarene Plateau

Feunteun

Miller

Carpentier

et al. 2015

Progress in Oceanography

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Carpentier EA 7316International audienceLeptocephali are the poorly-understood transparent larvae of elopomorph fishes that live in the ocean surface layer throughout the world’s tropical and subtropical oceans. Their feeding ecology has been difficult to understand because they appear to primarily feed on particulate organic material (POM), which contains few identifiable objects, and there have been few studies on their diets or trophic positions. This study presents the first results on the trophic position of c.a. 50 leptocephali belonging to 7 families of leptocephali that were compared to 30 taxa of other marine animals and to POM samples. To that end, the carbon and nitrogen stable isotope ratios were analyzed on specimens of leptocephali, various taxa of mesozooplankon, cephalopods, fishes, and POM collected west of the Mascarene Plateau in the western Indian Ocean. Nitrogen and carbon isotopic ratio analyses indicated that the 12 taxa of DNA barcoded leptocephali (≥15 species) could be separated into 2 groups of species with either higher (Group 1: 9 taxa of 7 families, 25–91 mm) or lower (Group 2: 3 taxa of 2 families, 43–275 mm) δ15N ranges. Group 2 exclusively included species that reach much larger sizes of > 150–200 mm (Nemichthys and Avocettina, 3 species of Ariosoma-type), whereas Group 1 included Anguilla bicolor bicolor, Serrivomeridae, Muraenidae, Congridae (3 species), Chlopsidae, Ophichthidae (2 species), and Thalassenchelys. Differences in feeding depths, the types of POM ingested by preference or because of different jaw morphology, or the transport of larvae from other regions with different isotopic signatures are possible reasons for the differences between the two groups. The isotopic signatures of 14 taxa of copepods had higher but slightly overlapping δ15N and δ13C signatures compared to leptocephali and most crustaceans and other mezozooplankton, cephalopods and mesopelagic fish taxa had even higher values. The δ15N and δ13C signatures and composition of POM were variable spatially and with depth and may have been influenced by particulates originating from the shallow banks of the Mascarene Plateau. The two apparent isotopic groups of leptocephali should be examined in relation to their consumption of POM, which can include various proportions of prokaryotes, phytoplankton, protozoans, discarded appendicularian houses and other materials, by conducting further studies in different regions and using a variety of techniques

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Section: Discussionmentioning

confidence: 99%

Stable isotopic composition of anguilliform leptocephali and other food web components from west of the Mascarene Plateau

Feunteun

Miller

Carpentier

et al. 2015

Progress in Oceanography

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“…The extent of this dependence is further elucidated in the dual isotope plots and mixing models (see "Discussion" section below). Moeri et al (2003) have shown that ambient ammonia can have direct effects on nitrogen isotope ratios of fish tissue. Although sampling of nutrients for respective sites was minimal and perhaps not biologically different (Table 1), there were higher levels of ammonia south of the causeway.…”

Section: Comparison Of Isotopic Signaturesmentioning

confidence: 99%

Influence from Hydrological Modification on Energy and Nutrient Transference in a Deltaic Food Web

Goecker

Valentine

Sklenar

et al. 2008

Estuaries and Coasts

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Alterations of hydrology are known to trigger changes in coastal ecosystems, such as the composition and abundances of local flora and fauna. It is less well known how these alterations lead to changes in nutrient and energy transfers in these systems. We used comparisons of stable isotope signatures (δ 13 C, δ 15 N, and δ 34 S) in the tissues of conspecific plants and animals collected on each side of the Mobile Bay Causeway to determine the extent to which the causeway may have altered energy and nutrient exchange between the Mobile-Tensaw Delta and upper Mobile Bay. While the δ 13 C signatures of most plants and animals varied irrespective of their location relative with causeway location, their δ 15 N and δ 34 S signatures were almost always more enriched south of the causeway, indicating significant alterations of trophic linkages within this estuarine food web. Dual isotope plots and mixing model analyses indicated that while terrestrial and floating plants were trophically important to consumers north of the causeway, submerged aquatic vegetation was more important to consumers south of the causeway. Although limited in spatial and temporal scale, our results preliminarily show that there are noteworthy differences in stable isotope signatures most likely due to the Mobile Bay Causeway altering energy and nutrient transference.

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“…Therefore, in order to interpret the isotopic data obtained from each tissue, the tissues must be considered separately. For fishes, a common practice has been to sample the dorsal white muscle,7, 23 while some workers have used bone collagen,24 fish otoliths,25 fish liver26 or whole fish.…”

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confidence: 99%

Muscle and scale isotopic offset of three fish species in the Mediterranean Sea: Dentex dentex, Argyrosomus regius and Xyrichtys novacula

Blanco

Deudero

Box

2009

Rapid Comm Mass Spectrometry

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Diet information of organisms was traditionally acquired by the use of lethal techniques (gut content or muscle delta(13)C and delta(15)N isotopic ratios). An increase in the number of isotopic ratio studies and the vulnerability of some species have led to increased use of non-lethal methodologies for conservation purposes. In the present work we have compared the delta(13)C and delta(15)N isotopic signals of muscle and scales of three different fish species in order to test fish-scale sampling as a non-lethal technique in fish trophodynamics. A positive correlation was found between muscle and scales in Argyrosomus regius and Xyrichtys novacula, while Dentex dentex showed no correlation due to the small length range of this species. The isotopic offset (Delta(13)C and Delta(15)N) between muscle and scales was significantly different among species (analysis of variance (ANOVA), p < 0.001) with Tukey's post-hoc HSD indicating a tissue offset difference (p < 0.001) for both stable isotopes in all species, except for Delta(13)C between A. regius and X. novacula and for Delta(15)N between D. dentex and X. novacula (p > 0.05). Mean delta(13)C and delta(15)N values between species showed significant differences (paired t-test, p < 0.01) between muscle and scale with an enrichment for delta(13)C and a depletion for delta(15)N. Spatial differences were found in the Delta(13)C of X. novacula between the studied locations, while no differences were found for Delta(15)N, indicating that non-geographical differences should be considered in the application of scales instead of muscle for (15)N, while for (13)C differences in the geographical isotopic offset should be considered.

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Direct effects of ambient ammonia on the nitrogen isotope ratios of fish tissues

Cited by 8 publications

References 11 publications

Stable isotopic composition of anguilliform leptocephali and other food web components from west of the Mascarene Plateau

Stable isotopic composition of anguilliform leptocephali and other food web components from west of the Mascarene Plateau

Influence from Hydrological Modification on Energy and Nutrient Transference in a Deltaic Food Web

Muscle and scale isotopic offset of three fish species in the Mediterranean Sea: Dentex dentex, Argyrosomus regius and Xyrichtys novacula

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