Abstract：
The whale shark (Rhincodon typus) is a filter-feeding organism that can be considered a sentinel species, and Bahía de los Ángeles (BLA) in the Gulf of California is an important sighting site for these elasmobranchs. This filter-feeding organism can be considered a pollutant sampler from the marine environment. Persistent organic pollutants are toxic compounds with high mobility and environmental persistence, bioaccumulation and trophic transfer. Among these are polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs). The present work aimed to determine concentrations of PAHs and OCPs in whale shark skin biopsies, collected in 2021 at BLA. Mean detected levels of PAHs and OCPs were 279.4 ng/g dw (dry weight) and 1478.1 ng/g dw, respectively. Analysis of similarities between the ordered sizes (4.2-7.6 m) and the concentrations of PAHs and OCPs indicated no significant differences. Individual PAHs detected indicate pyrogenic and petrogenic sources; the presence of pesticides at levels higher than those of hydrocarbons may be related to agricultural activity in the areas surrounding the Baja California peninsula. This study is the first report of PAH levels in R. typus for the Gulf of California and Mexico.
摘要：
鲸鲨（Rhincodontypus）是一种滤食生物，可以被认为是前哨物种，加利福尼亚湾的Bahíadelosángeles（BLA）是这些弹丸的重要目击地点。这种滤食生物可以被认为是来自海洋环境的污染物采样器。持久性有机污染物是具有高流动性和环境持久性的有毒化合物，生物积累和营养转移。其中包括多环芳烃(PAHs)和有机氯农药(OCPs)。本工作旨在确定鲸鲨皮肤活检中PAHs和OCPs的浓度，2021年在BLA收集。PAHs和OCPs的平均检测水平为279.4ng/gdw（干重）和1478.1ng/gdw，分别。有序尺寸（4.2-7.6m）与PAHs和OCPs浓度之间的相似性分析表明没有显着差异。检测到的单个PAHs表明是高温和岩石来源；农药的含量高于碳氢化合物的含量可能与下加利福尼亚半岛周边地区的农业活动有关。这项研究是加利福尼亚州和墨西哥湾R.typus中PAH水平的第一份报告。
