Extant mat microbes synchronize vertical migration to a diel tempo

Biddanda, Bopaiah A.; Weinke, Anthony D.; Stone, Ian P.

doi:10.1016/j.jglr.2022.10.006

Cited by 6 publications

(7 citation statements)

References 51 publications

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“…Most of the dominant diatoms found in these microbial mat communities represented benthic, motile groups. Biddanda et al (2023) noted that the mass vertical microbial migration of microbial mats occurs at a small scale but may have large impacts on metabolic processes in the mat. Motile diatoms may actively participate in this, such as Craticula optimizing nitrogen respiration in low light conditions (Merz et al, 2021).…”

Section: Community Compositionmentioning

confidence: 99%

Metabarcoding reveals unique microbial mat communities and evidence of biogeographic influence in low‐oxygen, high‐sulfur sinkholes and springs

Fray,

McGovern,

Casamatta

et al. 2024

Ecology and Evolution

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High‐sulfur, low‐oxygen environments formed by underwater sinkholes and springs create unique habitats populated by microbial mat communities. To explore the diversity and biogeography of these mats, samples were collected from three sites in Alpena, Michigan, one site in Monroe, Michigan, and one site in Palm Coast, Florida. Our study investigated previously undescribed eukaryotic diversity in these habitats and further explored their bacterial communities. Mat samples and water parameters were collected from sulfur spring sites during the spring, summer, and fall of 2022. Cyanobacteria and diatoms were cultured from mat subsamples to create a culture‐based DNA reference library. Remaining mat samples were used for metabarcoding of the 16S and rbcL regions to explore bacterial and diatom diversity, respectively. Analyses of water chemistry, alpha diversity, and beta diversity articulated a range of high‐sulfur, low‐oxygen habitats, each with distinct microbial communities. Conductivity, pH, dissolved oxygen, temperature, sulfate, and chloride had significant influences on community composition but did not describe the differences between communities well. Chloride concentration had the strongest correlation with microbial community structure. Mantel tests revealed that biogeography contributed to differences between communities as well. Our results provide novel information on microbial mat composition and present evidence that both local conditions and biogeography influence these unique communities.

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Section: Community Compositionmentioning

confidence: 99%

Metabarcoding reveals unique microbial mat communities and evidence of biogeographic influence in low‐oxygen, high‐sulfur sinkholes and springs

Fray,

McGovern,

Casamatta

et al. 2024

Ecology and Evolution

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“…Complimentary to diel cycling, vertical migrations within BCMs have been extensively studied in areas like the Great Lakes sinkholes. Here, diel partitioning by light influences vertical migration of photosynthetic bacteria during the day and sulfur oxidizing bacteria at night, with the fastest motility of both occurring directly after dawn and dark (Figure 3; Biddanda et al., 2023). Thus, light and oxygen gradients often guide diel cycling in BCM communities.…”

Section: Resource Partitioning Structures Carbon Nitrogen and Sulfur ...mentioning

confidence: 99%

“…Across diel cycles, sulfide‐oxidizing bacteria, such as Beggiatoa spp., migrate vertically in layered mats based on where the oxygen–sulfide boundary occurs, remaining in anoxic conditions. At night, anoxic conditions penetrate throughout layered BCMs, and sulfide‐oxidizing bacteria have been shown to migrate to the top of the mat in freshwater and marine systems (Biddanda et al., 2023; Jørgensen & Des Marais, 1986). Sulfate reduction can occur in both oxic and anoxic conditions, was observed to be most prevalent at the oxic–anoxic interface of these layered mats, and likely requires a similar specialized niche in less structured BCM communities (Figure 3; Visscher et al., 1992).…”

Section: Resource Partitioning Structures Carbon Nitrogen and Sulfur ...mentioning

confidence: 99%

“…Microscale habitat heterogeneity in vertical layered mats or horizontally across less structured BCMs creates spatial resource partitioning, allowing a vast diversity of microbes to exist within a single mat (e.g., Vigneron et al., 2018). Furthermore, diurnal patterns of light, temperature, and other abiotic factors affect microbial migration and activity over diel cycles, creating temporal resource partitioning (e.g., Biddanda et al., 2023). Mechanisms of succession affect mats over longer time scales and bring together the effects of temporal and spatial resource partitioning to build and sustain geochemical cycling within functional mat communities.…”

Section: Connecting Cycles: Succession and The Effects Of Disturbance...mentioning

confidence: 99%

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Divide and conquer: Spatial and temporal resource partitioning structures benthic cyanobacterial mats

Powell,

McCoy

2024

Journal of Phycology

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Benthic cyanobacterial mats are increasing in abundance worldwide with the potential to degrade ecosystem structure and function. Understanding mat community dynamics is thus critical for predicting mat growth and proliferation and for mitigating any associated negative effects. Carbon, nitrogen, and sulfur cycling are the predominant forms of nutrient cycling discussed within the literature, while metabolic cooperation and viral interactions are understudied. Although many forms of nutrient cycling in mats have been assessed, the links between niche dynamics, microbial interactions, and nutrient cycling are not well described. Here, we present an updated review on how nutrient cycling and microbial community interactions in mats are structured by resource partitioning via spatial and temporal heterogeneity and succession. We assess community interactions and nutrient cycling at both intramat and metacommunity scales. Additionally, we present ideas and recommendations for research in this area, highlighting top‐down control, boundary layers, and metabolic cooperation as important future directions.

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“…Moreover, Grey and Deines (2005) found that Chironomid larvae in Wyresdale Park Lake and Esthwaite Water (UK) might be rather reliant on sulfide for their primary S resource, which implies that the chironomids feed on SOB that assimilated the sulfide. Sanders Jr. et al (2011) found that in Lake Huron (USA), bacterial mats (including chemosynthetic SOB mat; Biddanda et al, 2009, 2023) flourished by nutrient‐rich groundwater venting from the lake bottom supported a benthic fauna. Evaluating the S resource of benthic animals quantitatively necessitates measuring the S isotope ratios of sulfide and sulfate, as well as animal tissues.…”

Section: Introductionmentioning

confidence: 99%

Major contribution of sulfide‐derived sulfur to the benthic food web in a large freshwater lake

2023

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In freshwater systems, contributions of chemosynthetic products by sulfur‐oxidizing bacteria in sediments as nutritional resources in benthic food webs remain unclear, even though chemosynthetic products might be an important nutritional resource for benthic food webs in deep‐sea hydrothermal vents and shallow marine systems. To study geochemical aspects of this trophic pathway, we sampled sediment cores and benthic animals at two sites (90 and 50 m water depths) in the largest freshwater (mesotrophic) lake in Japan: Lake Biwa. Stable carbon, nitrogen, and sulfur isotopes of the sediments and animals were measured to elucidate the sulfur nutritional resources for the benthic food web precisely by calculating the contributions of the incorporation of sulfide‐derived sulfur to the biomass and of the biogeochemical sulfur cycle supporting the sulfur nutritional resource. The recovered sediment cores showed increases in 34S‐depleted sulfide at 5 cm sediment depth and showed low sulfide concentration with high δ34S in deeper layers, suggesting an association of microbial activities with sulfate reduction and sulfide oxidation in the sediments. The sulfur‐oxidizing bacteria may contribute to benthic animal biomass. Calculations based on the biomass, sulfur content, and contribution to sulfide‐derived sulfur of each animal comprising the benthic food web revealed that 58%–67% of the total biomass sulfur in the benthic food web of Lake Biwa is occupied by sulfide‐derived sulfur. Such a large contribution implies that the chemosynthetic products of sulfur‐oxidizing bacteria are important nutritional resources supporting benthic food webs in the lake ecosystems, at least in terms of sulfur. The results present a new trophic pathway for sulfur that has been overlooked in lake ecosystems with low‐sulfate concentrations.

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Extant mat microbes synchronize vertical migration to a diel tempo

Cited by 6 publications

References 51 publications

Metabarcoding reveals unique microbial mat communities and evidence of biogeographic influence in low‐oxygen, high‐sulfur sinkholes and springs

Metabarcoding reveals unique microbial mat communities and evidence of biogeographic influence in low‐oxygen, high‐sulfur sinkholes and springs

Divide and conquer: Spatial and temporal resource partitioning structures benthic cyanobacterial mats

Major contribution of sulfide‐derived sulfur to the benthic food web in a large freshwater lake

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