Deep water renewal in Saanich Inlet, an intermittently anoxic basin

Anderson, James J.; Devol, Allan H.

doi:10.1016/0302-3524(73)90052-2

Cited by 163 publications

(98 citation statements)

References 3 publications

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“…Where the water column is shaUow or seasonally stratified, such areas are not hypoxic throughout the year; they are ventilated seasonally through faU and winter mixing events (e.g., shelfregion of the northern Gulf of Mexico, ). Likewise, many hypoxic fjords (e.g., Saanich Inlet; Anderson and Devol, 1973) and inland seas (e.g., Baltic Sea;Wulff et al, 1990) are not permanently hypoxic since they can be ventilated by episodic deep water renewal events. In this thesis, l will investigate a possible increase in sediment oxygen mineralization which may have lead to the recent emergence of persistent hypoxia in the Lower St. Lawrence Estuary ( Fig.…”

Section: Hypoxia and Eutrophicationmentioning

confidence: 99%

Modeling of dissolved oxygen levels in the bottom waters of the Lower St. Lawrence Estuary: Coupling of benthic and pelagic processes

2006

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Section: Hypoxia and Eutrophicationmentioning

confidence: 99%

Modeling of dissolved oxygen levels in the bottom waters of the Lower St. Lawrence Estuary: Coupling of benthic and pelagic processes

2006

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“…-650 to -200 to strong coastal upwelling (Anderson and Devol 1973;Richards 1965). Several recent publications concern the redox chemistry of this system (Emerson et al 1982;Jacobs and Emerson 1982).…”

mentioning

confidence: 99%

Microbial mediation of Mn(II) and Co(II) precipitation at the O₂/H₂S interfaces in two anoxic fjords1

Tebo

Nealson

Emerson

et al. 1984

Limnology & Oceanography

144

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We studied the potential for bacterial catalysis of Mn(II), Co(H), and Fe(III) precipitation at the 02/H2S interfaces in Saanich Inlet, British Columbia, and in Framvaren Fjord, Norway. In Saanich Inlet the interface is below the photic zone, but in Framvaren Fjord it is within the region of significant light penetration. Biological catalysis of metal removal was measured as the binding of radioactive isotopes as a function of time in the presence and absence of poisons which do not measurably interfere with the solution chemistry of manganese. In a region just above the oxic/ anoxic interface in Saanich Inlet, the binding of Co(I1) and Mn(I1) was inhibited by the bacterial poisons, but Fe(III) precipitation was not. Measurements of the oxidation state of the particulate material indicated a slightly higher Mn(IV):Mn(II) ratio in the region of dissolved Mn(B) precipitation, confirming that manganese was being oxidized and not simply bound, In both fjords, binding was either stronger or more rapid under air saturation than under conditions of oxygen limitation, suggesting that O2 is the electron acceptor during manganese oxidation. In Framvaren

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“…The interconnected Dean and Burke Channels are treated together; maximum depth is 590 m and both are relatively well-flushed receiving a moderate sediment load. In the fourth fjord, Saanich Inlet on Vancouver Island, a 70 m depth sill constrains exchange w~t h the 230 m inner basin; in most summers this water column develops a lower anoxic layer that is replaced from below as dense, oxygenated water flows over the SLU each fall (Herlinveaux 1962, Anderson & Devol 1973; this inflowing water moves into the bottom of the fjord pushing the low oxygen water upward.…”

Section: Methodsmentioning

confidence: 99%

Brachiopod populations: distribution in fjords of British Columbia (Canada) and tolerance of low oxygen concentrations

Tunnicliffe¹,

Wilson²

1988

Mar. Ecol. Prog. Ser.

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Brachiopods are not generally considered to b e important components of modern communities, especially in comparison to their Paleozoic heyday. By using a submersible to examine the deep walls of 4 fjords in British Columbia (Canada), the abundance of 3 brachiopod species was documented. Laqueus californlanus is ubiquitous from 50 to 700 m water depth being found in conditions of high turbulence, h~g h suspended sediment load and low oxygen concentrations. Terebratulina unguicula is most common in a fjord that shows annual upwelling of anoxic waters; it is one of the few animals found in areas with oxygen levels frequently below 0 1 m1 1-l. The inarticulate Crania californica has a restricted distribution that may be a function of low dispersability. Over a number of years, one monitored brachlopod population was stable although a gradual retreat from the low oxygen waters was observed. Size-frequency examinations of in situ brach~opods revealed no distinguishable size classes: the death assemblage resembled the in situ population but a dredged collection did not. Brachiopods are common in all British Columbian fjords; we measured an average density of 190 m-' while maxima ranged up to 945 m-2. Bivalves, commonly cited as ecological replacements of brachiopods, are virtually absent. Two features of the brachiopods stand out: they withstand prolonged periods of low oxygen stress, and they remain a consistent part of the deep-water, hard-substratum habitat.

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Deep water renewal in Saanich Inlet, an intermittently anoxic basin

Cited by 163 publications

References 3 publications

Modeling of dissolved oxygen levels in the bottom waters of the Lower St. Lawrence Estuary: Coupling of benthic and pelagic processes

Modeling of dissolved oxygen levels in the bottom waters of the Lower St. Lawrence Estuary: Coupling of benthic and pelagic processes

Microbial mediation of Mn(II) and Co(II) precipitation at the O₂/H₂S interfaces in two anoxic fjords1

Brachiopod populations: distribution in fjords of British Columbia (Canada) and tolerance of low oxygen concentrations

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Deep water renewal in Saanich Inlet, an intermittently anoxic basin

Cited by 163 publications

References 3 publications

Modeling of dissolved oxygen levels in the bottom waters of the Lower St. Lawrence Estuary: Coupling of benthic and pelagic processes

Modeling of dissolved oxygen levels in the bottom waters of the Lower St. Lawrence Estuary: Coupling of benthic and pelagic processes

Microbial mediation of Mn(II) and Co(II) precipitation at the O2/H2S interfaces in two anoxic fjords1

Brachiopod populations: distribution in fjords of British Columbia (Canada) and tolerance of low oxygen concentrations

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Microbial mediation of Mn(II) and Co(II) precipitation at the O₂/H₂S interfaces in two anoxic fjords1