Organochlorine contaminants in complete clutches of Morelet's crocodile (Crocodylus moreletii) eggs from Belize

Environmental Pollution
Ted H WuTodd A Anderson

Abstract

Seven complete clutches of Morelet's crocodile (Crocodylus moreletii) eggs were collected in northern Belize and examined for organochlorine (OC) pesticide residues. The primary OC detected, p,p-DDE, was found in every egg analyzed (n=175). Other OCs detected included p,p-DDT, p,p-DDD, methoxychlor, aldrin, and endosulfan I. Concentrations of individual OCs ranged from 4 ppb (ng chemical/g egg wet weight) to greater than 500 ppb. A statistical evaluation of p,p-DDE levels in three complete clutches was used to derive the minimum number of eggs needed from a clutch to precisely determine the mean p,p-DDE concentration representative of that clutch. Sample sizes of 8 (80% confidence level) and 11 (90% confidence level) were determined to yield an accurate estimate of contaminant levels in a full clutch of eggs. The statistically recommended sample size of 11 eggs (at 90% confidence level) was successfully tested on the four additional clutches.

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Citations

Jul 6, 2014·Diseases of Aquatic Organisms·Pierre Charruau, Carlos A Niño-Torres
Aug 21, 2007·Environmental Pollution·Philip N SmithKevin D Reynolds
Sep 11, 2007·Environmental Pollution·Thomas R RainwaterScott T McMurry
Oct 3, 2008·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·John D McVayLlewellyn D Densmore
Mar 11, 2020·Biological Reviews of the Cambridge Philosophical Society·Ruchira SomaweeraBruce L Webber
Jun 4, 2014·Environmental Toxicology and Chemistry·Derek R FaustPhilip N Smith
Dec 22, 2006·The Science of the Total Environment·Thomas R RainwaterScott T McMurry

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