Use of multiple tools to assess the feeding preference of coastal dolphins

Beneditto, Ana Paula Madeira Di; Souza, Cristina Maria Magalhães de; Kehrig, Helena A.; Rezende, Carlos Eduardo de

doi:10.1007/s00227-011-1726-3

Cited by 49 publications

(30 citation statements)

References 42 publications

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“…Jaeger et al (2009) argued that the increase of Hg from specifi c prey to predator is not an accurate measured of biomagnifi cation. However, previous studies in the same area showed significant Hg transference in many trophic interactions, both predator-prey relations (Carvalho et al 2008, Kehrig et al 2009, Di Beneditto et al 2011 as entire food chains (Di ), supporting our results.…”

Section: Discussionsupporting

confidence: 91%

“…The isotopic values of δ 13 C were similar to those previously registered to marine coastal species in the study area (Di Beneditto et al 2011, and showed that most prey species is pelagic. Heavier δ 13 C values in the shrimp X. kroyeri refl ected its benthic habit (Branco and Moritz-Júnior 2001), and lighter values in fi sh L. grossidens indicated its anadromous habit, with seasonal movements between fl uvial and marine areas for reproduction (Froese and Pauly 2015).…”

Section: Discussionsupporting

confidence: 85%

“…Differences in prey digestion rates may lead to under-or overestimation of prey importance in predators' diet (Pierce and Boyle 1991). Many studies have applied multiple trophic markers together to minimize this bias, such as stomach content analysis, trace elements, and stable isotopes (Aubail et al 2011, Di Beneditto et al 2011, Connelly et al 2014. Mercury is a trace element that undergoes biomagnifi cation in animals' tissues through trophic transfer, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil

Bittar

Rezende

Kehrig

et al. 2016

An. Acad. Bras. Ciênc.

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The trophic transfer of total mercury (THg) and its bioaccumulation from prey species to the predator fi sh Trichiurus lepturus was analysed in coastal waters of southeastern Brazil to evaluate the trace element dynamic in this predator-prey system. The isotopic (δ 13 C and δ 15 N) relation between this predator and its prey allowed inferences on prey assimilation and predator feeding habits. The THg increment varied from 4.5 to 19.5 times between prey and predator, with a biomagnifi cation power of 0.59. The prey species could be divided into three groups regarding δ N highlighted juvenile conspecifi cs as the main via of this trace element and the most assimilated prey. The isotopic relation between predator and its prey species showed a feeding activity preferably coastal and pelagic.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil

Bittar

Rezende

Kehrig

et al. 2016

An. Acad. Bras. Ciênc.

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“…Liver concentrations of Hg were similar (Lailson-Brito et al, 2002) or higher (Kunito et al, 2004;de Carvalho et al, 2008;Moreira et al, 2009;Seixas et al, 2009;Di Beneditto et al, 2011) to those found in Franciscana dolphins from Brazil. In all these reports the liver was the principal organ for Hg accumulation compared to other tissues, as well as in the specimens analyzed in this study.…”

supporting

confidence: 66%

The role of metallothioneins, selenium and transfer to offspring in mercury detoxification in Franciscana dolphins ( Pontoporia blainvillei )

Romero

Polizzi

Chiodi

et al. 2016

Marine Pollution Bulletin

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The concentrations of mercury (Hg), selenium (Se) and metallothioneins (MT) were evaluated in fetuses, calves, juveniles and adults of the endangered coastal Franciscana dolphin (Pontoporia blainvillei) from Argentina. Mercury concentrations varied among analyzed tissues (liver, kidney, muscle and brain), with liver showing the higher concentrations in all specimens. An age-dependent accumulation was found in liver, kidney and brain. No significant relationship between Hg and MT concentrations was found for all tissues analyzed. Hepatic Hg molar concentrations were positively correlated with those of Se, indicating a great affinity between these two elements. Furthermore, dark granules of HgSe were observed in Kupffer cells in the liver by electron microscopy, suggesting the role of this macrophage in the detoxification of Hg. A transfer of Hg through placenta was proved. The presence of Hg in brain in all age classes did not show concentrations associated with neurotoxicity.

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“…However, stomach content analysis usually indicates the last food intake, but not the dietary input over time (food assimilation). Thus, complementary analysis with other diet markers such as stable isotopes can provide additional information about feeding preference and trophic niche in the ecosystem (Di Beneditto et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Trophic niche comparison between two predators in northern Rio de Janeiro State, Brazil: a stable isotopes approach

et al. 2013

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The trophic niche of the sympatric predators Pontoporia blainvillei(franciscana dolphin) and Trichiurus lepturus (ribbonfish) was compared by stable isotope (δ15N and δ13C) ratios in hepatic and muscular tissues to understand how they co-exist in the northern Rio de Janeiro State (21°30′S-22°15′S), south-eastern Brazil. Dolphin specimens were incidentally captured through commercial gillnet fisheries, while fish specimens were the target of these fisheries. The predators had similar δ15N values in the liver (P. blainvillei: 14.6 ± 1.0‰; T. lepturus: 14.4 ± 0.6‰), which indicates similar trophic position in the recent food intake. However,P. blainvillei showed lighter δ15N values in muscle (13.8 ± 1.0‰) than T. lepturus (15.0 ± 0.4‰), revealing differences in the long term diet that could be related with the prey size ingested. The δ13C signatures showed a preferential inshore and benthic food chain for P. blainvillei (liver: −15.2 ± 0.6‰; muscle: −16.0 ± 0.5‰) and a more offshore and pelagic food chain for T. lepturus(liver: −17.2 ± 0.6‰; muscle: −16.8 ± 0.3‰). The isotopic variances of liver and muscle revealed a broader niche width to P. blainvillei in relation to T. lepturus, with a greater use of available food resources in coastal waters. In the area of study, the differences in habitat use and exploitation of food resources are favoring the predators' coexistence.

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Use of multiple tools to assess the feeding preference of coastal dolphins

Cited by 49 publications

References 42 publications

Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil

Mercury bioaccumulation and isotopic relation between Trichiurus lepturus (Teleostei) and its preferred prey in coastal waters of southeastern Brazil

The role of metallothioneins, selenium and transfer to offspring in mercury detoxification in Franciscana dolphins ( Pontoporia blainvillei )

Trophic niche comparison between two predators in northern Rio de Janeiro State, Brazil: a stable isotopes approach

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