Dynamic phytoplankton community structure in a subtropical reservoir during an extended drought, Central Texas, USA

Gámez, Tatiana E.; Groeger, Alan W.; Manning, Schonna R.

doi:10.1007/s00027-022-00903-1

Cited by 5 publications

(3 citation statements)

References 56 publications

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“…Of the five main cyanobacterial genera present in the metaphyton mats, only Geitlerinema and Microcoleus (previously known as Phormidium ) have species known to produce ATX and dhATX [ 1 , 11 ]. Limnothrix and Pseudanabaena had been isolated from planktonic water samples collected in upriver reservoirs within the Highland Lakes system from 2010 to 2015 [ 35 ], demonstrating that these taxa were present upriver of the current study site.…”

Section: Discussionmentioning

confidence: 99%

Environmental Factors Impacting the Development of Toxic Cyanobacterial Proliferations in a Central Texas Reservoir

Perri,

Bellinger,

Ashworth

et al. 2024

Toxins

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Cyanobacterial harmful algal proliferations (cyanoHAPs) are increasingly associated with dog and livestock deaths when benthic mats break free of their substrate and float to the surface. Fatalities have been linked to neurotoxicosis from anatoxins, potent alkaloids produced by certain genera of filamentous cyanobacteria. After numerous reports of dog illnesses and deaths at a popular recreation site on Lady Bird Lake, Austin, Texas in late summer 2019, water and floating mat samples were collected from several sites along the reservoir. Water quality parameters were measured and mat samples were maintained for algal isolation and DNA identification. Samples were also analyzed for cyanobacterial toxins using LC-MS. Dihydroanatoxin-a was detected in mat materials from two of the four sites (0.6–133 ng/g wet weight) while water samples remained toxin-free over the course of the sampling period; no other cyanobacterial toxins were detected. DNA sequencing analysis of cyanobacterial isolates yielded a total of 11 genera, including Geitlerinema, Tyconema, Pseudanabaena, and Phormidium/Microcoleus, taxa known to produce anatoxins, including dihydroanatoxin, among other cyanotoxins. Analyses indicate that low daily upriver dam discharge, higher TP and NO3 concentrations, and day of the year were the main parameters associated with the presence of toxic floating cyanobacterial mats.

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Section: Discussionmentioning

confidence: 99%

Environmental Factors Impacting the Development of Toxic Cyanobacterial Proliferations in a Central Texas Reservoir

Perri,

Bellinger,

Ashworth

et al. 2024

Toxins

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“…Approaches to quantifying the presence of phytoplankton can be divided into two groups: cell abundance and photosynthetic pigment concentrations. Both cell identification and enumeration, and phytoplankton pigment (mainly chlorophyll-a and phycocyanin) concentrations have been extensively used for surface water quality assessments in lakes [20,21], rivers [22], ponds [23,24], and reservoirs [25,26].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sampling Time and Depth on Phytoplankton Metrics in Agricultural Irrigation Ponds

Smith,

Wolny,

Stocker

et al. 2024

Environments

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Spatiotemporal variations of phytoplankton populations in agricultural irrigation ponds need to be accounted for in order to properly assess water quality. Phytoplankton cell and photosynthetic pigment concentrations are two common metrics used to characterize phytoplankton communities. This work evaluated depth and time of the day as factors affecting discrete sampling of phytoplankton. The abundance of chlorophytes, diatoms, cyanobacteria, flagellates, and dinoflagellates, as well as chlorophyll-a and phycocyanin pigments, were determined in samples taken at the surface and depth, in 0.5m increments, in three to five spatial replications at 9 am, 12 pm, and 3 pm in two ponds in Maryland, USA. Depth was a significant factor for photosynthetic pigment concentration variations in both ponds on most sampling dates and time of day was a significant factor for photosynthetic pigment concentrations in half of the sampling dates. Depth was not a significant factor in cell concentration variations for any of the phytoplankton groups observed, but time of day was a significant factor in 40% of the sampling dates. Two distinct patterns in pigment concentration daily variation were observed. The first featured a continuous increase with depth throughout the day. The second showed maximum concentrations at the surface in the morning changing to maximum concentrations at 0.5m depth at 12 pm and 3 pm; these patterns corresponded to different morning solar irradiance levels. This indicates that sampling depth and time can be a significant factor when evaluating photosynthetic pigments and should be accounted for in monitoring programs that rely on pigments for decision-making.

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“…With a lower water level, the concentrations of nutrients and organic matter might increase due to a concentration effect, affecting GPP and R rates (Jeppensen et al, 2015;Brasil et al, 2016). In addition, with the resumption of rain, more nutrients and organic matter are carried into the lake, combined with the low water volume, increases nutrient concentrations even more (Gámez et al, 2023;Isles et al, 2023). Lake metabolism responses to changes in rainfall depend on morphometric and catchment characteristics (Gagliardi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Post-drought leads to increasing metabolic rates in the surface waters of a natural tropical lake

Brighenti,

Viana,

Pujoni

et al. 2024

Front. Geochem.

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As hotspots of the global carbon cycle, lakes can regulate climate change while being regulated by it via a feedback loop. As ecosystem metabolism is considered to be a sentinel to these changes, we used high-frequency measurements and the inverse modeling approach to study the temporal dynamic of gross primary production (GPP), respiration (R), and net ecosystem production (NEP) at surface waters of a tropical lake, which lost about 60% of its volume in almost 10 years. This water loss and the return of the average rainfall led to an increased concentration of nitrogen, phosphorus, and dissolved organic carbon and decreased water transparency and light availability. During the post-drought period, epilimnetic GPP increased by 40% compared with the pre-drought period, and R surpassed GPP during the mixing period of the lake. We discuss that this modification results from higher carbon and nutrient concentrations, lower light availability, and a change in the lake stratification pattern. Surface water metabolism changed due to meteorological and hydrological drought, and it may continue to change under the ongoing variation in rainfall patterns, temperature, and human disturbances.

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Dynamic phytoplankton community structure in a subtropical reservoir during an extended drought, Central Texas, USA

Cited by 5 publications

References 56 publications

Environmental Factors Impacting the Development of Toxic Cyanobacterial Proliferations in a Central Texas Reservoir

Environmental Factors Impacting the Development of Toxic Cyanobacterial Proliferations in a Central Texas Reservoir

Effects of Sampling Time and Depth on Phytoplankton Metrics in Agricultural Irrigation Ponds

Post-drought leads to increasing metabolic rates in the surface waters of a natural tropical lake

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