Assessment of iron(II) binding by a cryptoendolithic bacterial community: Implications for iron cycling in the Jurassic Navajo Sandstone

Hammes, Erik A.; Matthew, Floyd,; Kurtz, Harry D.

doi:10.1016/j.jaridenv.2013.05.006

Cited by 2 publications

(6 citation statements)

References 31 publications

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“…The sequencing data affirm that Cyanobacteria is the dominant phylum in cryptoendolithic habitats (Hammes et al, 2013;Kurtz & Netoff, 2001;Kurtz et al, 2005;Lee et al, 2016). Previous studies have reported Chroococcidiopsis to be the predominant cyanobacteria observed in arid lithic systems based on morphological characterization (Bell, 1993;Bhatnagar & Bhatnagar, 2005;Büdel & Wessels, 1991;Casamatta et al, 2002;Friedmann, 1980;Pointing & Belnap, 2012;Wessels & Büdel, 1995).…”

Section: Discussionsupporting

confidence: 68%

“…All samples were obtained from the Jurassic Navajo Sandstone, an eolian sandstone unit located in the Harris Wash area of the GSENM in southern Utah (Hammes et al., ). Eight sandstone samples were collected from sites around a sandstone dome having different topographic features (Table , Figure ).…”

Section: Methodsmentioning

confidence: 99%

“…Cryptoendolithic bacterial communities are involved in nutrient cycling within the oligotrophic rock substratum (Hammes et al., ; Kurtz, Cox, & Reisch, ). Microbial diversity within these sandstones has previously been studied using microscopic and molecular techniques (Bell, ; Hammes et al., ; Kurtz et al., ). While these analyses have provided some data on the structure of these cryptoendolithic communities, the data are insufficient to accurately describe these communities.…”

Section: Introductionmentioning

confidence: 99%

“…Some areas of the Jurassic Navajo sandstone have been bleached of its color, which has been mainly attributed to paleogeochemical processes (Beitler, Chan, & Parry, 2003;Chan, Parry, & Bowman, 2000;Potter & Chan, 2011). Previous studies suggest that microorganisms are at least partially involved in this ongoing process of iron bleaching (Hammes, Floyd, & Kurtz, 2013;Loope, Kettler, & Weber, 2010).…”

mentioning

confidence: 99%

“…It is well known that cyanobacteria are the primary producers within the cryptoendolithic communities, providing energy in the form of fixed carbon by photosynthesis and supporting the growth of heterotrophic microorganisms Casamatta, Verb, Beaver, & Vis, 2002;de la Torre, Goebel, Friedmann, & Pace, 2003). Cryptoendolithic bacterial communities are involved in nutrient cycling within the oligotrophic rock substratum (Hammes et al, 2013;Kurtz, Cox, & Reisch, 2005). Microbial diversity within these sandstones has previously been studied using microscopic and molecular techniques (Bell, 1993;Hammes et al, 2013;Kurtz et al, 2005).…”

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confidence: 99%

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Core bacterial community composition of a cryptoendolithic ecosystem in the Grand Staircase‐Escalante National Monument, Utah

Kaur

Kurtz

2018

MicrobiologyOpen

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Cryptoendolithic bacterial communities in the Jurassic Navajo Sandstones play an important ecological role in this ecosystem. Developing a better understanding of the role of these cryptoendolithic communities required a deeper knowledge of the microbial diversity present. We analyzed the bacterial diversity in eight sandstones samples from several microgeological features associated with a large sandstone dome. Cryptoendolithic bacterial diversity is clustered into three distinct groups which correlated with topography, suggesting the duration of water retention might be a factor. Comparisons of diversity between each cluster showed that a core bacterial community exists in this habitat. The overall bacterial community structure was dominated by Cyanobacteria, Proteobacteria, Bacteroidetes, and Actinobacteria. The most prevalent genera in cyanobacteria were Leptolyngbya, Chroococcidiopsis, and unclassified cyanobacteria accounting for the bulk of cyanobacterial sequences. Within the Proteobacteria, Alphaproteobacteria were the largest class detected, with members of the Acetobacteraceae, particularly the genus Acidiphilium, being the most abundant. Acidiphilium spp. are capable of aerobic ferric iron reduction under moderately acidic conditions, explaining the high levels of iron (II) in this system. This study highlights the extent of unexplored bacterial diversity in this habitat system and sets the premise for elaborating on the ecological function of cryptoendolithic communities.

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