Temporal fluctuations in grain size, organic materials and iron concentrations in intertidal surface sediment of San Francisco Bay

Hydrobiologia ◽  
1985 ◽  
Vol 129 (1) ◽  
pp. 91-107 ◽  
Author(s):  
Elizabeth A. Thomson-Becker ◽  
Samuel N. Luoma
Keyword(s):  
Grain Size ◽  
San Francisco ◽  
Surface Sediment ◽  
Organic Materials ◽  
San Francisco Bay ◽  
Temporal Fluctuations ◽  
Intertidal Surface ◽  
Iron Concentrations

scholarly journals Rediscovery of the horseshoe shrimp Lightiella serendipita Jones, 1961 (Cephalocarida: Hutchinsoniellidae) in San Francisco Bay, California, USA, with a key to the worldwide species of Cephalocarida

2020 ◽  
Vol 40 (5) ◽  
pp. 600-606
Author(s):  
Crystal Garcia ◽  
Isa Woo ◽  
D Christopher Rogers ◽  
Alison M Flanagan ◽  
Susan E W De La Cruz
Keyword(s):  
Grain Size ◽  
San Francisco ◽  
Environmental Variables ◽  
San Francisco Bay ◽  
Habitat Requirements ◽  
Scanning Electron Micrograph ◽  
Tube Forming ◽  
Fine Grain ◽  
High Sulfate ◽  
Commensal Relationship

Abstract Lightiella serendipita Jones, 1961 was first discovered in San Francisco Bay, California in 1953, but it had not been observed since 1988. In 2017, a total of 13 adult L. serendipita specimens were found as part of a study in central San Francisco Bay, nearly doubling the total number of specimens ever collected. We measured vertical distribution of macroinvertebrates and environmental variables, including grain size and chemical composition of sediment samples, to evaluate potential features associated with the habitat of the species. Specimens were generally found in sediments with low organic matter (1.7–3%), high sulfate concentrations (594.6–647 ppm SO4), fine grain size (12.8–36.2% sand, 35.6–58% silt, 22.8–37.6% clay) and were mostly found in deep core sections (4–10 cm). Specimens were also consistently observed in cores containing tube-forming Polychaeta (i.e., Sabaco elongatus (Verrill, 1873) and Capitellidae), suggesting L. serendipita may have a commensal relationship with sedentary polychaetes, as do other cephalocaridans such as Lightiella incisaGooding, 1963. We provide a scanning electron micrograph of L. serendipita and the first complete key to the species in class Cephalocarida to help elucidate the taxonomy of this rare crustacean taxon. The perceived absence of L. serendipita in previous surveys of the Bay may be attributable to its rarity; however, additional research is needed to fully understand habitat requirements and population size of this unique endemic species.

Temporal fluctuations of silver, copper and zinc in the bivalve Macoma balthica at five stations in South San Francisco Bay

Hydrobiologia ◽  
1985 ◽  
Vol 129 (1) ◽  
pp. 109-120 ◽  
Author(s):  
Samuel N. Luoma ◽  
Daniel Cain ◽  
Christopher Johansson
Keyword(s):  
San Francisco ◽  
San Francisco Bay ◽  
Macoma Balthica ◽  
Temporal Fluctuations ◽  
Silver Copper ◽  
Copper And Zinc

Sources of mercury to San Francisco Bay surface sediment as revealed by mercury stable isotopes

2011 ◽  
Vol 75 (3) ◽  
pp. 691-705 ◽  
Author(s):  
Gretchen E. Gehrke ◽  
Joel D. Blum ◽  
Mark Marvin-DiPasquale
Keyword(s):  
Stable Isotopes ◽  
San Francisco ◽  
Surface Sediment ◽  
San Francisco Bay ◽  
Mercury Stable Isotopes

A record of hydrocarbon input to San Francisco Bay as traced by biomarker profiles in surface sediment and sediment cores

1999 ◽  
Vol 64 (1-2) ◽  
pp. 115-127 ◽  
Author(s):  
Frances D. Hostettler ◽  
Wilfred E. Pereira ◽  
Keith A. Kvenvolden ◽  
Alexander van Geen ◽  
Samuel N. Luoma ◽  
...  
Keyword(s):  
San Francisco ◽  
Surface Sediment ◽  
San Francisco Bay ◽  
Sediment Cores

A Qualitative Study of Ecstasy Sellers in the San Francisco Bay Area

2004 ◽  
Author(s):  
Sheigla Murphy ◽  
Paloma Sales ◽  
Micheline Duterte ◽  
Camille Jacinto
Keyword(s):  
Qualitative Study ◽  
San Francisco ◽  
San Francisco Bay ◽  
San Francisco Bay Area ◽  
Bay Area

Cyborg Jotería Pedagogies: Latinx Drag Queens Leveraging Communication Ecologies in the Age of the Digital and Social Displacement

2020 ◽  
Vol 14 (2) ◽  
pp. 44-66
Author(s):  
José Ramón Lizárraga ◽  
Arturo Cortez
Keyword(s):  
San Francisco ◽  
San Francisco Bay ◽  
San Francisco Bay Area ◽  
Digital Technologies ◽  
Physical World ◽  
Political Issues ◽  
Drag Queen ◽  
Bay Area ◽  
Online Presence ◽  
Drag Queens

Researchers and practitioners have much to learn from drag queens, specifically Latinx queens, as they leverage everyday queerness and brownness in ways that contribute to pedagogy locally and globally, individually and collectively. Drawing on previous work examining the digital queer gestures of drag queen educators (Lizárraga & Cortez, 2019), this essay explores how non-dominant people that exist and fluctuate in the in-between of boundaries of gender, race, sexuality, the physical, and the virtual provide pedagogical overtures for imagining and organizing for new possible futures that are equitable and just. Further animated by Donna Haraway’s (2006) influential feminist post-humanist work, we interrogate how Latinx drag queens as cyborgs use digital technologies to enhance their craft and engage in powerful pedagogical moves. This essay draws from robust analyses of the digital presence of and interviews with two Latinx drag queens in the San Francisco Bay Area, as well as the online presence of a Xicanx doggie drag queen named RuPawl. Our participants actively drew on their liminality to provoke and mobilize communities around socio-political issues. In this regard, we see them engaging in transformative public cyborg jotería pedagogies that are made visible and historicized in the digital and physical world.

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