Publications by authors named "J van Els"

This study reports the concentration of heavy metals in the tissues of stranded sea snakes that died as a result of exposure to an oil spill on the eastern coast of Sharjah, UAE. Given the limited occurrence of stranded sea snakes observed along Sharjah's eastern coast outside this spill incident, we are using strandings collected from the nearby Arabian Gulf coast of Sharjah to compare the levels of heavy metals in sea snakes affected by the oil spill against their non-oiled counterparts. The sample comprised 14 Arabian Gulf Coral Reef Sea Snakes ), 6 Yellow-bellied Sea Snakes (), and 4 Yellow Sea Snakes ().

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Article Synopsis
  • The study evaluates the levels of organochlorine pesticides (OCPs) and polycyclic aromatic hydrocarbons (PAHs) in tissues of stranded sea snakes in Sharjah, UAE, analyzing samples from 13 individuals of three species.
  • Muscle, liver, and fat tissues were processed using micro-QuEChERs and analyzed with gas chromatography-mass spectrometry (GC/MS), revealing that OCPs were present in higher concentrations while PAHs were detected more frequently.
  • The findings indicate significant bioaccumulation of OCPs and PAHs in sea snake tissues, with variations in OCP types detected based on tissue type and higher concentrations of OCPs compared to previous studies in marine reptiles.
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Human-mediated habitat destruction has had a profound impact on increased species extinction rates and population declines worldwide. The coastal development in the United Arab Emirates (UAE) over the last two decades, serves as an example of how habitat transformation can alter the landscape of a country in just a few years. Here, we study the genomic implications of habitat transformation in the Critically Endangered Emirati Leaf-toed Gecko (Asaccus caudivolvulus), the only endemic vertebrate of the UAE.

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Advances in genomics have greatly enhanced our understanding of mountain biodiversity, providing new insights into the complex and dynamic mechanisms that drive the formation of mountain biotas. These span from broad biogeographic patterns to population dynamics and adaptations to these environments. However, significant challenges remain in integrating large-scale and fine-scale findings to develop a comprehensive understanding of mountain biodiversity.

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