Organochlorine Pesticides In Chorioallantoic Membranes Of Morelet’s Crocodile Eggs From Belize

Pepper, Christopher B. and Rainwater, Thomas R. and Platt, Steven G. and Dever, Jennifer A. and Anderson, Todd A. and McMurry, Scott T. (2004) Organochlorine Pesticides In Chorioallantoic Membranes Of Morelet’s Crocodile Eggs From Belize. Journal of Wildlife Diseases, 30 (3). pp. 493-500. ISSN 0090-3558

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    Recent studies examined the utility of the chorioallantoic membrane CAM) as anon lethal, noninvasive indicator of environmental contaminant exposure in oviparous wildlife. The CAM is a highly vascularized extra embryonic membrane that functions as a site for respiration, nutrient transport, and waste storage during embryonic development. After hatching, the CAM is usually discarded with the eggshell and can be used for chemical residue analysis. Chorioallantoic membranes have been used successfully to examine contaminant exposure and predict chemical concentrations in multiple species of birds and reptiles. In this study, we examined organ chlorine OC) pesticide concentrations in Cams from eggs of Morelet’s crocodiles Crocodylus moreletii) from northern Belize. Multiple Rocs were detected in crocodile Cams, including aldrin, dieldrin, endrin, dichlorodiphenyltrichloroethane, dichlorodiphenyltrichloroethane, dichlorodiphenyltrichloroethane DDE), heptachlor, lindane, and methoxychlor. Number and concentrations of OC compounds in Cams were variable. The most prevalent contaminant detected was DDE, which occurred in 69% of Cams, with concentrations ranging from 0.3 parts per billion ppb) to 17.0 ppb, The OC burdens in crocodile Cams confirm contamination of eggs and suggest exposure in embryos and maternal females. These results further support the use of Cams as qualitative indicators of OC exposure in oviparous wildlife. The efficacy of this sampling technique in the field will depend on the logistics and cost associated with CAM collection and the specific life history traits of the wildlife species.

    Item Type: Peer-reviewed Journal Article
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    Publisher: Unspecified Publisher
    Keywords: Belize chorioallantoic membrane Crocodylus moreletii eggs Morelet’s crocodile organ chlorine pesticides reptiles wildlife
    Subjects: (A) Biodiversity > (AI) Reptiles > (AIA) Freshwater
    Publication Sources: (3) Other Source > (3D) Other or Unspecified
    Date Deposited: 15 Nov 2010 06:00
    Last Modified: 16 Nov 2011 09:53

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