Maternal transfer of selenium in Alligator mississippiensis nesting downstream from a coal‐burning power plant
Identifieur interne : 001103 ( Main/Merge ); précédent : 001102; suivant : 001104Maternal transfer of selenium in Alligator mississippiensis nesting downstream from a coal‐burning power plant
Auteurs : John H. Roe [États-Unis] ; William A. Hopkins [États-Unis] ; Jennifer A. Baionno [États-Unis] ; Brandon P. Staub [États-Unis] ; Christopher L. Rowe [États-Unis] ; Brian P. Jackson [États-Unis]Source :
- Environmental Toxicology and Chemistry [ 0730-7268 ] ; 2004-08.
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Abstract
Selenium (Se) is embryotoxic in many oviparous vertebrates, but little is known about maternal transfer of Se and its impact in reptiles. Over a four‐year period, we collected three clutches of eggs of the American alligator (Alligator mississippiensis) from a single nest at a site contaminated with Se and compared egg and hatchling Se concentrations and clutch viability from this nest to nests downstream from the contaminated site (two clutches from two nests) and at a reference site (two clutches from two nests). Eggs and hatchlings from the nest at the Se‐contaminated site and downstream nests had elevated Se concentrations (2.1–7.8 ppm) and lower viability (30–54%) compared to reference nests (1.4–2.3 ppm and 67–74% viability), but Se concentrations did not exceed reproductive toxicity thresholds established for other oviparous vertebrates. Selenium concentrations were higher in chorioallantoic membranes of eggs from Se‐contaminated sites, suggesting that this tissue may be useful as a nondestructive index of Se exposure for embryos of A. mississippiensis. Examination of these data suggests that further studies on uptake, accumulation, and reproductive success of crocodilian embryos exposed to excessive Se are warranted.
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DOI: 10.1897/03-520
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Drawer E, Aiken, South Carolina 29802</wicri:regionArea><wicri:noRegion>South Carolina 29802</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Environmental Toxicology and Chemistry</title><title level="j" type="sub">An International Journal</title><title level="j" type="abbrev">Environmental Toxicology and Chemistry</title><idno type="ISSN">0730-7268</idno><idno type="eISSN">1552-8618</idno><imprint><publisher>Wiley Periodicals, Inc.</publisher><pubPlace>Hoboken</pubPlace><date type="published" when="2004-08">2004-08</date><biblScope unit="volume">23</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="1969">1969</biblScope><biblScope unit="page" to="1972">1972</biblScope></imprint><idno type="ISSN">0730-7268</idno></series><idno type="istex">D352CC5B7894F9EE619D9D7FBE869C2D0EC47851</idno><idno type="DOI">10.1897/03-520</idno><idno type="ArticleID">ETC5620230820</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0730-7268</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alligator mississippiensis</term><term>Chorioallantoic membrane</term><term>Crocodylia</term><term>Maternal transfer</term><term>Selenium</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Selenium (Se) is embryotoxic in many oviparous vertebrates, but little is known about maternal transfer of Se and its impact in reptiles. Over a four‐year period, we collected three clutches of eggs of the American alligator (Alligator mississippiensis) from a single nest at a site contaminated with Se and compared egg and hatchling Se concentrations and clutch viability from this nest to nests downstream from the contaminated site (two clutches from two nests) and at a reference site (two clutches from two nests). Eggs and hatchlings from the nest at the Se‐contaminated site and downstream nests had elevated Se concentrations (2.1–7.8 ppm) and lower viability (30–54%) compared to reference nests (1.4–2.3 ppm and 67–74% viability), but Se concentrations did not exceed reproductive toxicity thresholds established for other oviparous vertebrates. Selenium concentrations were higher in chorioallantoic membranes of eggs from Se‐contaminated sites, suggesting that this tissue may be useful as a nondestructive index of Se exposure for embryos of A. mississippiensis. Examination of these data suggests that further studies on uptake, accumulation, and reproductive success of crocodilian embryos exposed to excessive Se are warranted.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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