Differences in the Morphology and Reproduction of Boltenia villosa Across a Latitudinal Gradient
Loading...
Date
2022-05
Authors
Sanchez-Reddick, Carmen Theresa
Journal Title
Journal ISSN
Volume Title
Publisher
University of Oregon
Abstract
While the larval and early juvenile stages of the stalked ascidian Boltenia villosa are well documented in the literature, little is known about the range of morphological variation in the adults. Anecdotal evidence suggests that larger individuals with short stalks make up the populations found in Washington, while Oregon populations consist of smaller individuals with longer stalks. The present study aimed to develop a qualitative understanding of the morphological and reproductive differences across the latitudinal gradient of Boltenia villosa. This was achieved by using a combination of morphometrics and scanning electron microscopy to determine any significant differences between different populations and the use of oocyte diameter and dissections to compare reproductive output. The results suggest a significant morphological and reproductive difference between the two populations in body proportions and spine character despite their genetic similarities. These preliminary results indicate the possible existence of an undescribed subspecies of Boltenia villosa, but more research into the morphological changes across the entire range of each morphotype's range are needed.
Description
26 pages
Keywords
Marine Biology, Ascidian Boltenia Villosa, Sea Squirt, Morphological Variation, Oocyte Diameter, Morphometrics, Gonadosomatic Index, Scanning Electron Microscopy, Molecular Analysis