Drew University Library : University Archives : Theses and Dissertations
    
author Mehek M. Agrawal
title Integrative taxonomy of New Jersey tardigrades
abstract Tardigrades are a phylum of enigmatic micrometazoans found all over the globe that have been of scientific interest ever since they were discovered in the 18th Century. Tardigrades are able to survive a range of stressful conditions that are too harsh, or even lethal to most animals, by undergoing cryptobiosis. Their innate survival mechanisms are very exciting to scientists looking for potential applications of their biology to human industries. As tardigrade species become increasingly studied in the lab, it is important to ensure they are correctly identified by taxonomy. Accurate classification and identification of species is the only way to ensure that studies on these animals conducted in separate parts of the world can inform each other and remain valuable.

This study aimed to use integrative taxonomy to classify organisms of found tardigrade populations. Integrative taxonomy refers to the use of a combination of taxonomic techniques, typically morphological, molecular, and ecological, to classify organisms more accurately, and has become increasingly used by taxonomists over the past decade The use of multiple techniques allows researchers to gain more understanding of the similarities and differences that exist between two organisms that may not be captured by the use of a singular approach. Approximately 100 tardigrades were isolated and imaged under a microscope from a range of substrates sampled across 10 sites to search for primarily limno-terrestrial tardigrades of northern New Jersey, USA including Drew University. 18S rRNA barcode sequencing was performed on the photographed individuals. Complete sequences for these genes were assembled for 5 distinct species that are described in the paper.

Two of the 18S rRNA sequences generated are slightly different from ones available in GenBank, but most closely match Milnesium tardigradum and Ramazottius oberhaeuseri. The remaining were identified as Minibiotus intermedius, Paramacrobiotus tonollli and Diphascon pingue, of which the latter two have never been described to occur in New Jersey before. Further investigations into the novel sequences is recommended using alternate DNA barcodes that may yield more results Research efforts to improve the understanding of biogeographic distributions of tardigrades is extremely important in monitoring the sensitivity of these animals to human-induced pressures.

school The College of Liberal Arts, Drew University
degree B.S. (2023)
advisor Marvin Bayne
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