Details:

Journal Title:
Harmful Algae
Personal Author:
Reinl, Kaitlin L. ; Sterner, Robert W. ; Lafrancois, Brenda Moraska ; Brovold, Sandra
Reinl, Kaitlin L. ; Sterner, Robert W. ; Lafrancois, Brenda Moraska ; Brovold, Sandra Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
Lake Superior has recently begun experiencing cyanobacterial blooms comprised of Dolichospermum lemmermannii near the Apostle Islands and along the southern shore of the western arm. Little is known about the origin of these blooms. Experiments were conducted during the summers of 2017 and 2018 to identify sources of propagules and characteristics of sites that were potential sources. The 2017 experiments were conducted using a factorial design with three source zones (‘River’, ‘Lake’, and ‘Harbor’), two nutrient conditions (high and low N:P), and three temperatures (15, 20, and 25°C). At the end of the experiment, cyanobacteria were most abundant from the ‘River’ and ‘Harbor’ zones at low N:P and 20 and 25°C, with D. lemmermannii most abundant at 20°C. Subsequently, in 2018 we evaluated 26 specific inland locations from three waterbody types (‘River’, ‘Lake/Pond’, and ‘Coastal’) and explored similarities among those sites that produced cyanobacteria in high abundance when samples were incubated under optimal conditions (low N:P and 25°C). Under these growing conditions, we found high cyanobacteria abundance developed in samples from river sites with low ambient temperatures and high conductivity. Field monitoring showed that Lake Superior nearshore temperatures were higher than rivers. These observations suggest that blooms of D. lemmermannii in Lake Superior are initiated by fluvial seeding of propagules and highlight the importance of warmer temperatures and favorable nutrient and light conditions for subsequent extensive cyanobacterial growth. We argue that the watershed is an important source of biological loading of D. lemmermannii to Lake Superior and that when those cells reach the nearshore where there are warmer water temperatures and increased light, they can grow in abundance to produce blooms.
Keywords:
[+]
Aquatic Science Plant Science
Source:
Harmful Algae, 100, 101941
DOI:
https://doi.org/10.1016/j.hal.2020.101941
ISSN:
1568-9883
Format:
PDF
Publisher:
Elsevier BV
Document Type:
Journal Article
Funding:
Grant no. NA12OAR432007
License:
https://creativecommons.org/licenses/by-nc-nd/4.0/
Rights Information:
CC BY-NC-ND
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:e9dd83cb0d6a09e7280203996adb90e7409480cb40b80c019d2e304b5d4e2251
Download URL:
https://repository.library.noaa.gov/view/noaa/59472/noaa_59472_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +