Anne Sturz's research while affiliated with University of San Diego and other places

Publications (4)

Article
Water-, mud-, gas-, and petroleum-bearing seeps are part of the Salton Sea geothermal system (SSGS) in Southern California. Seeps in the Davis-Schrimpf seep field (˜14,000 m2) show considerable variations in water temperature, pH, density, and solute content. Water-rich springs have low densities (98 vol%). Halogen geochemistry of the waters indica...
Article
Deception Island (62°59′S, 60°34′W) is an active volcano with a submerged caldera (Port Foster) located northwest of the Antarctic Peninsula. Surveys following the most recent eruption of the volcano in 1970 showed that direct deposition of coarse pyroclastics into Port Foster decimated the benthic communities. The objective of this study is to exa...
Article
Temporal and spatial distribution of dissolved macronutrients (ammonia, nitrate, phosphate and silica) and productivity were investigated within and around Port Foster, the flooded 160-m-deep caldera of Deception Island, Antarctica. This study was part of the Erupt Project, which included five seasonal cruises over a complete annual cycle during 19...

Citations

... Hydrothermal petroleum systems are mostly known through the study of active hydrothermal vents (e.g., Czwhanska et al., 1985;Simoneit, 1993;Simoneit et al., 2000;Yamanaka et al., 2000;Planke et al., 2003;Venkatesan et al., 2003;Svensen et al., 2007;Simoneit et al., 2009). However, hydrothermal systems can also generate petroleum accumulations of economic significance (e.g., the Grant Canyon and Bacon Flat oilfields, Nevada, USA; Hulen et al., 1994). ...
... Apart from a recent paper based on samples from the outer shelf and upper slope (238-354 m water depth) north of SG (Dejardin et al., 2018), and an earlier study that included several sites at similar upper bathyal depths to the south of SG (Echols, 1971), nothing further has been published on foraminiferal distribution and taxonomy in this region. However, a number of foraminiferal studies have focused on surrounding shelf areas, including the 105 Falkland Islands and their adjacent shelf (Heron-Allen and Earland, 1932), fjords and channels of Patagonia (Violanti et al., 2000;Hromic et al., 2006), the South Shetland Islands (Finger and Lipps, 1981;Gray et al., 2003;Majewski, 2005Majewski, , 2010Majewski et al., 2007;Rodriguez et al., 2010), and the Antarctic Peninsula (Ishman and Domack, 1994;Ishman and Szymcek, 2003;Murray and Pudsey, 2004;Majewski et al., 2016). Research was also conducted in deep-water regions, highlighting foraminiferal gradients across the Drake Passage (Herb, 1971) and the frontal system of the ACC (Mackensen et 110 al., 1993). ...
... Deception Island (62°55ʹS 60°37ʹW) (Figure 1(b)) is a volcanic island placed in the South Shetland Islands archipelago (Figure 1(a)) (Jerez et al. 2013;Ibáñez et al. 2003). It consists of a central caldera covered by seawater known as Port Foster, and connected to the Bransfield Strait by the Neptune's Bellow channel (Angulo-Preckler et al. 2021;Duarte et al. 2021;Smith et al. 2003). In the last 160 years, several small-scale volcanic eruptions have been documented, although not comparable with the last major and violent eruption that took place 10,000 years ago, giving the island its current geomorphological characterization (Angulo-Preckler et al. 2021;Duarte et al. 2021;Ibáñez et al. 2003). ...
... Based on this general outline of the complicated and not fully understood process of using biogenic salts by autotrophs, it can be assumed that metabolites excreted by benthic organisms may contribute significant N and P loads to primary production. This is indirectly confirmed by Sturz et al. (2003) who observed higher loads of biogenic salts in the bottom layer, the source of which, in addition to the microbial decomposition of sinking detritus, are metabolites excreted by animals staying near the The excretion of nitrogen and phosphorus bottom. Therefore, in view of the naturally low concentration of ammoniacal nitrogen in the Southern Ocean, even a small inflow of ammoniacal nitrogen excreted by benthic animals may result in the enrichment of the ecosystem with available nitrogen in autotrophs (Bode et al. 2002). ...