Mercury, selenium and stable isotopes in four small cetaceans from the Southeastern Brazilian coast: Influence of feeding strategy

Baptista, Gilberto; Kehrig, Helena A.; Beneditto, Ana Paula Madeira Di; Hauser‐Davis, Rachel Ann; Almeida, Marcelo Gomes de; Rezende, Carlos Eduardo de; Siciliano, Salvatore; Moura, Jailson Fulgêncio de; Moreira, Isabel

doi:10.1016/j.envpol.2016.08.088

Cited by 33 publications

(14 citation statements)

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“…However, very little is known concerning contamination by POPs and mercury in bottlenose dolphins and other marine mammal species from the Southeastern Tropical Pacific and the west coast of South America, except for the pioneering research on POPs in endemic pinnipeds from the Galapagos Islands, i.e., Galapagos sea lions (Zalophus wollebaeki) and Galapagos fur seals (Arctocephalus galapagoensis) (Alava et al, 2009(Alava et al, , 2011(Alava et al, , 2017bAlava and Gobas, 2012;Alava and Ross, 2018), and the first assessment of POPs in Chilean blue whales (Balaenoptera musculus) from Isla de Chiloé, southern Chile (Muñoz-Arnanz et al, 2019). Generally, most studies on chemical contaminants (e.g., POPs, mercury) in Latin America have focused on small cetacean species from the Atlantic coast of South America, mainly along coastal Brazil (Yogui and Sericano, 2009;Alonso et al, 2010Alonso et al, , 2012Alonso et al, , 2015Bisi et al, 2012;Santos-Neto et al, 2014;Lavandier et al, 2015Lavandier et al, , 2016Lavandier et al, , 2019Baptista et al, 2016;Kehrig et al, 2016Kehrig et al, , 2017, and the southern marine-coastal regions of Chile and Argentina (Gerpe et al, 2002;Cáceres-Saez et al, 2015, 2018Durante et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Persistent Organic Pollutants and Mercury in Genetically Identified Inner Estuary Bottlenose Dolphin (Tursiops truncatus) Residents of the Guayaquil Gulf, Ecuador: Ecotoxicological Science in Support of Pollutant Management and Cetacean Conservation

et al. 2020

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The bottlenose dolphin is one of the most common cetaceans found in the coastal waters, estuaries, and mangroves of Ecuador. However, its population size is gradually declining in the Gulf of Guayaquil, and anthropogenic factors including habitat degradation, uncontrolled dolphin watching, dredging activities, increasing maritime traffic, underwater noise, bycatch, and marine pollution have been implicated in their decline. Very little is known about contamination by persistent organic pollutants (POPs) and mercury in bottlenose dolphins from the Pacific coast of South America. To address this research gap, the first assessment of total mercury (THg) and POPs, including polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), and polybrominated diphenyl ethers (PBDEs), in free-ranging bottlenose dolphins in mangroves (El Morro Mangrove Wildlife Refuge) of the Gulf of Guayaquil, was conducted in Ecuador in 2018. Dolphin samples (i.e., skin and blubber; n = 9), were obtained using dart biopsy field methods for contaminant analysis. POP concentrations ranged from 0.56 to 13.0 mg/kg in lipid weight, while THg ranged from 1.92 to 3.63 mg/kg in dry weight. The predominant POPs were OCPs (50% of POP), followed by PCBs (46%) and PBDEs (6.0%); particularly, p,p-DDE, the main DDT metabolite and a potent antiandrogenic, accounting for 42% of POP, ranging from 0.12 to ∼7.0 mg/kg lw, followed by PCB 153 (8.0%) and PCB 180 (5.0%). PBDE 47 accounted for 2.0% of POP. While the POP concentrations are lower than those found in dolphins from many other regions

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Section: Introductionmentioning

confidence: 99%

Persistent Organic Pollutants and Mercury in Genetically Identified Inner Estuary Bottlenose Dolphin (Tursiops truncatus) Residents of the Guayaquil Gulf, Ecuador: Ecotoxicological Science in Support of Pollutant Management and Cetacean Conservation

et al. 2020

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“…There are many studies on the determination of heavy metals in the organs and tissues of delphinids, especially Stenella coeruleoalba, beached alive or dead, in various oceans and seas (Law, 1992;Baptista et al, 2016;Shoham-Frider et al, 2016;Rojo-Nieto et al, 2017;Martínez -Lopez et al, 2019). Some papers report the concentrations of cadmium and mercury in delphinids from the northern Tyrrhenian Sea, stranded along the coasts of Liguria and Tuscany, from the Ionian Sea and Adriatic Sea, stranded along the coasts of the Puglia region, and in Sicily, particularly in the Strait of Sicily (Leonzio et al, 1992;Monaci et al, 1998;Bellante et al, 2012;Cardellicchio et al, 2000;Cardellicchio et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Mercury and cadmium in striped dolphins (Stenella coeruleoalba) stranded along the Southern Tyrrhenian and Western Ionian coasts

et al. 2020

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Pollution from heavy metals is becoming a serious and widespread problem due to their persistent and bioaccumulative nature, moreover in the Mediterranean Sea, threatening food safety and the health of humans and marine animals. Cadmium and mercury in particular, are considered two of the most toxic metals to living organisms. Their presence is associated with the contribution of human activity, implying an increased level in the different environmental compartments and the inevitable bioaccumulation in the food chain.In this study, levels of cadmium and mercury were determined in liver, kidney, and muscle tissue of dolphinid specimens of Stenella coeruleoalba stranded in different locations along the coastal areas of the Tyrrhenian and Ionian Sea in Southern Italy, during the period 2015–2018 by Atomic Absorption Spectrophotometry. Data were compared with those reported for other locations along the Mediterranean sea. The correlations between biometric data (body length, weight and gender) and cadmium and mercury concentrations in samples of cetaceans were statistically analysed in order to investigate the risk these contaminants may pose to the delphinids health.Examination of the pattern of contaminants revealed a significantly high distribution for mercury in all the matrices analyzed (liver, kidney and muscle tissue). On the contrary, elevated concentrations of cadmium were found only in liver (range: 0.005 - 8.95 mg/kg w.w.) and kidney (range: 0.005 - 34.1 mg/kg w.w.) due to accumulator role of these organs in long-term exposures.

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“…As apex predators, resident marine mammals, and especially dolphins, can be useful indicators of estuarine and adjacent coastal ecosystem health, and ultimately public health (Baptista et al, 2016;Bisi et al, 2013). More specifically, most delphinids have long life spans, feed at high trophic levels and are sensitive to environmental changes evoked through anthropogenic pressures (Moore, 2008;O'shea & Odell, 2008).…”

Section: Introductionmentioning

confidence: 99%

Trophic dynamics in two South American estuaries encompassing industrial development and a biodiversity hotspot

Trevizani

Domit

Broadhurst

et al. 2019

Aquatic Conservation

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1. Estuaries are critical to the life histories and development of many marine species, and support some of the most productive aquatic ecosystems. But, owing to their geographic accessibility, many estuaries face considerable anthropogenic threats, which can be exacerbated in developing nations. 2. Understanding the ecological implications of anthropogenic activities as a precursor to dedicated conservation activities requires comprehensive assessments of baseline trophic relationships. This study addresses a shortfall in such information for two tropical, coastal ecosystems globally identified as priority areas for biodiversity conservation: the Paranaguá estuarine complex and Cananéia-Iguape estuarine lagoon system in southern Brazil. 3. Ecological relationships were investigated through carbon and nitrogen stable isotope (δ 13 C and δ 15 N) determination in sediments, plant fragments and the muscle tissues of marine species occupying different trophic levels, including benthic invertebrates, This article is protected by copyright. All rights reserved. This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Mercury, selenium and stable isotopes in four small cetaceans from the Southeastern Brazilian coast: Influence of feeding strategy

Cited by 33 publications

References 60 publications

Persistent Organic Pollutants and Mercury in Genetically Identified Inner Estuary Bottlenose Dolphin (Tursiops truncatus) Residents of the Guayaquil Gulf, Ecuador: Ecotoxicological Science in Support of Pollutant Management and Cetacean Conservation

Persistent Organic Pollutants and Mercury in Genetically Identified Inner Estuary Bottlenose Dolphin (Tursiops truncatus) Residents of the Guayaquil Gulf, Ecuador: Ecotoxicological Science in Support of Pollutant Management and Cetacean Conservation

Mercury and cadmium in striped dolphins (Stenella coeruleoalba) stranded along the Southern Tyrrhenian and Western Ionian coasts

Trophic dynamics in two South American estuaries encompassing industrial development and a biodiversity hotspot

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