High grazing rates on cryptophyte algae in Chesapeake Bay
Johnson, Matthew D.
Beaudoin, David J.
Frada, Miguel J.
Brownlee, Emily F.
Stoecker, Diane K.
MetadataShow full item record
Cryptophyte algae are globally distributed photosynthetic flagellates found in freshwater, estuarine, and neritic ecosystems. While cryptophytes can be highly abundant and are consumed by a wide variety of protistan predators, few studies have sought to quantify in situ grazing rates on their populations. Here we show that autumnal grazing rates on in situ communities of cryptophyte algae in Chesapeake Bay are high throughout the system, while growth rates, particularly in the lower bay, were low. Analysis of the genetic diversity of cryptophyte populations within dilution experiments suggests that microzooplankton may be selectively grazing the fastest-growing members of the population, which were generally Teleaulax spp. We also demonstrate that potential grazing rates of ciliates and dinoflagellates on fluorescently labeled (FL) Rhodomonas salina, Storeatula major, and Teleaulax amphioxeia can be high (up to 149 prey predator−1 d−1), and that a Gyrodinium sp. and Mesodinium rubrum could be selective grazers. Potential grazing was highest for heterotrophic dinoflagellates, but due to its abundance, M. rubrum also had a high overall impact. This study reveals that cryptophyte algae in Chesapeake Bay can experience extremely high grazing pressure from phagotrophic protists, and that this grazing likely shapes their community diversity.
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 5 (2018): 241, doi:10.3389/fmars.2018.00241.
Suggested CitationArticle: Johnson, Matthew D., Beaudoin, David J., Frada, Miguel J., Brownlee, Emily F., Stoecker, Diane K., "High grazing rates on cryptophyte algae in Chesapeake Bay", Frontiers in Marine Science 5 (2018): 241, DOI:10.3389/fmars.2018.00241, https://hdl.handle.net/1912/10493
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Peltomaa, Elina; Johnson, Matthew D. (Inter-Research, 2017-02-09)The marine ciliate Mesodinium rubrum is known to form large non-toxic red water blooms in estuarine and coastal upwelling regions worldwide. This ciliate relies predominantly upon photosynthesis by using plastids and other ...
Johnson, Matthew D.; Beaudoin, David J.; Laza-Martinez, Aitor; Dyhrman, Sonya T.; Fensin, Elizabeth; Lin, Senjie; Merculief, Aaron; Nagai, Satoshi; Pompeu, Mayza; Setala, Outi; Stoecker, Diane K. (Frontiers Media, 2016-12-20)Ciliates from the genus Mesodinium are globally distributed in marine and freshwater ecosystems and may possess either heterotrophic or mixotrophic nutritional modes. Members of the Mesodinium major/rubrum species complex ...
Peltomaa, Elina; Johnson, Matthew D.; Taipale, Sami J. (MDPI AG, 2017-12-26)Microalgae have the ability to synthetize many compounds, some of which have been recognized as a source of functional ingredients for nutraceuticals with positive health effects. One well-known example is the long-chain ...