We do not see evidence for the presence of female gametangia (oospores) in North American Nitellopsis obtusa (Desvaux) J. Groves

Author:

Gottschalk Stephen D.12ORCID,Boissezon Aurélie3,Hamsher Sarah E.4,McCourt Richard M.5,Perleberg Donna J.6,Skawinski Paul M.7,Sleith Robin S.8,Karol Kenneth G.2

Affiliation:

1. Department of Biological Sciences, Fordham University, 441 East Fordham Road, Bronx, NY 10458, USA

2. The Lewis B. and Dorothy Cullman Program for Molecular Systematics, New York Botanical Garden, 2900 Southern Blvd, Bronx, NY 10458, USA

3. Institute Land-Nature-Landscape, HES-SO University of Applied Sciences and Arts of Western Switzerland, Geneva, Switzerland

4. Department of Biology and Annis Water Resources Institute, Grand Valley State University, Allendale and Muskegon, MI, USA

5. Department of Biodiversity, Earth and Environmental Science, Academy of Natural Sciences of Drexel University, Philadelphia, PA 19103, USA

6. Division of Ecological and Water Resources, Minnesota Department of Natural Resources, 1601 Minnesota Drive, Brainerd, MN 56401, USA

7. Extension Lakes Program, University of Wisconsin—Stevens Point, 800 Reserve Street Stevens Point, WI 54481, USA

8. Center for Water Health and Humans, Bigelow Laboratory for Ocean Sciences, 60 Bigelow Drive, East Boothbay, ME 04544, USA

Abstract

We contest the recently reported findings that suggest the presence of female gametangia in the North American range of the invasive macroalga Nitellopsis obtusa (Harrow-Lyle, T.J., Ginn, B.K., Kirkwood, A.E., and Melles, S.J. 2023. First report of female gametangia in the invasive macroalga starry stonewort ( Nitellopsis obtusa) in North America. Botany, 101: 61–64. doi:10.1139/cjb-2022-0096). The claims do not clearly show identifying morphology of N. obtusa female gametangia, are inconsistent with known characeaen developmental biology, and do not provide the evidence commensurate with such a claim. More convincing observational data are required. To date, only male thalli of N. obtusa have been confirmed either with herbarium vouchers or clear images. The appearance of female gametangia would have significant implications for the invasion biology of N. obtusa as well as approaches to managing its spread.

Funder

Wisconsin Department of Natural Resources

Publisher

Canadian Science Publishing

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