Relative influences of DOC flux and subterranean fauna on microbial abundance and activity in aquifer sediments: new insights from C-tracer experiments

Relative influences of DOC flux and subterranean fauna on microbial abundance and activity in aquifer sediments: new insights from 13C-tracer experiments

Microbial atrazine breakdown in a karst groundwater system and its effect on ecosystem energetics.

In the absence of sunlight energy, microbial community survival in subterranean aquifers depends on integrated mechanisms of energy and nutrient scavenging. Because karst aquifers are particularly sensitive to agricultural land use impacts due to rapid and direct hydrologic connections for pollutants to enter the groundwater, we examined the fate of an exogenous pesticide (atrazine) into such a...

Dissolved Organic Carbon Mobilisation in a Groundwater System Stressed by Pumping

The concentration and flux of organic carbon in aquifers is influenced by recharge and abstraction, and surface and subsurface processing. In this study groundwater was abstracted from a shallow fractured rock aquifer and dissolved organic carbon (DOC) was measured in observation bores at different distances from the abstraction bore. Groundwater abstraction at rates exceeding the aquifers yiel...

Microbial production and oxidation of methane in deep subsurface

The goal of this review is to summarize present studies on microbial production and oxidation of methane in the deep subterranean environments. Methane is a long-living gas causing the ‘‘greenhouse’’ effect in the planet’s atmosphere. Earlier, the deep ‘‘organic carbon poor’’ subsurface was not considered as a source of ‘‘biogenic’’ methane. Evidence of active methanogenesis and presence of via...

Echinoids of the Genus Tetragramma Agassiz (Phymosomatoida) from the Aptian Sediments of the Basab Region, Northwest of Kerman, Iran

The echinoid fauna of Basab area (Aptian), northwest of Kerman, is fairly rich and diverse, represented by Pygaulidae, Acropeltidae, Emiratiidae, Toxasteridae, Holectypidae, Stomechinidae and Saleniidae. Four regular echinoid species, among which three are new, assigned to genus Tetragramma Agassiz, are described and illustrated in the present paper. The new species are Tetragramma basabensis, ...