Monitoring Physiological Responses in Giant Toad (Rhinella marina) from Coatzacoalcos, Mexico: A Comparative Study after 8 Years

D. González-Mille, Omar Cruz-Santiago, G. Espinosa-Reyes, M. C. Cuevas-Díaz, I. Razo-Soto, C. Ilizaliturri-Hernández
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Abstract

The objective of this chapter is to present the results of a monitoring study carried out with physiological responses (biomarkers) in Rhinella marina (giant toad) for two different years, inhabiting the low basin of Coatzacoalcos river, one of the most contaminated regions in Mexico. A decrease in delta aminolevulinic acid dehydratase (δ-ALAD) (considered inhibition) and in the condition factor (1.2–1.5 times) found in toads of the industrial zone compared with reference organisms, each year. As for the hematological parameters, the mean corpuscular hemoglobin concentrations (MCHC), in the amphibians of industrial zone of the first sampling year show a decrease, while for the second sampling year, show an increment of 1.5 times than organisms of reference site. These effects could be associated with exposure to pollutants such as heavy metals (mainly Pb), which have been registered in different studies. This study demonstrates the usefulness of giant toads as biomonitors of contaminated sites. carried out to evaluate the differences between the biomarkers per years, with a level of significance of 1 and 5%. To evaluate the difference in δ-ALAD between years, zones, and the laboratory, the Kruskall-Wallis test was used. A correlation between δ-ALAD and hematologic parameters (Log-transformed) was realized with Spearman’s test.
墨西哥Coatzacoalcos巨蟾蜍(Rhinella marina)生理反应监测:8年后的比较研究
本章的目的是介绍在Rhinella marina(巨型蟾蜍)中进行的生理反应(生物标志物)监测研究的结果,该研究为期两年,居住在Coatzacoalcos河的低盆地,是墨西哥污染最严重的地区之一。与参考生物相比,每年在工业区蟾蜍中发现的δ氨基乙酰丙酸脱水酶(δ-ALAD)(被认为是抑制)和条件因子(1.2-1.5倍)的下降。在血液学参数方面,工业区两栖动物的平均红细胞血红蛋白浓度(MCHC)在第一个采样年呈下降趋势,而在第二个采样年则比参考地点的生物增加1.5倍。这些影响可能与暴露于重金属(主要是铅)等污染物有关,这已在不同的研究中得到证实。这项研究证明了巨蟾蜍作为污染地点生物监测仪的有效性。每年进行生物标志物之间的差异评估,显著性水平为1%和5%。为了评估δ-ALAD在年份、区域和实验室之间的差异,使用了Kruskall-Wallis试验。δ-ALAD与血液学参数(log -transform)之间的相关性通过Spearman检验实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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