Isolation basin records of late Quaternary sea-level change, central mainland British Columbia, Canada

Roe, Helen; Doherty, Christine T.; Patterson, R. Timothy; Milne, Glenn A.

doi:10.1016/j.quaint.2013.01.026

Cited by 11 publications

(15 citation statements)

References 75 publications

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“…inference of declining salinity, as chrysophytes in general are abundant only in freshwaters (Cumming et al 1993). Isolation of the Lake Stowell basin is consistent in terms of timing with other diatom studies around Vancouver Island, which describe rapid declines in marine or polyhalobian taxa associated with RSL withdrawal at~14.0 ka (Hutchinson et al 2004, James et al 2009, Roe et al 2013, Fedje et al 2018).…”

Section: Sea-level History and Isolation Of Lake Stowellsupporting

confidence: 81%

“…, Roe et al. , Fedje et al. ) indicates that this diatom record could serve as a reliable indicator of paleo‐salinity.…”

Section: Resultsmentioning

confidence: 97%

“…Changes in Lake Stowell diatom assemblages were not as clearly associated with direct influences of summer insolation and/or temperature; for instance, A. subarctica is a cold-water species (Nieminen 2008) that increased significantly in the early Holocene, in contrast with many proxy records from the region that infer warming during this period. This suggests that this species was instead responding to another aspect of climate or an independent forcing (Solovieva et al 2015), such as reduced nutrients from the surrounding catchment (Galloway et al 2007, Bennion et al 2012), or perhaps a prolonged period of vigorous mixing within the water column (Kienel et al 2005, Horn et al 2011, Roe et al 2013. Gibson et al (2003) suggest that A. subarctica is a better competitor under low total phosphorous (TP) concentrations compared to Stephanodiscus spp., which often replace it as TP increases.…”

Section: Diatom Responses To Holocene Environmental Changementioning

confidence: 99%

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Diatom responses to long‐term climate and sea‐level rise at a low‐elevation lake in coastal British Columbia, Canada

Neil

Lacourse

2019

Ecosphere

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Diatom assemblages from Lake Stowell, a low‐elevation lake in coastal British Columbia, were used to assess limnological responses associated with changes in relative sea level (RSL) and climate over the past 14,500 yr. Marine diatom taxa dominated the early record and disappeared abruptly by 14,000 cal yr BP in response to glacio‐isostatic uplift and an ensuing decrease in RSL. A brackish‐freshwater phase from 14,200 to 13,400 cal yr BP was marked by increases in several diatom taxa with tolerance for low‐to‐moderate salinity, after which assemblages became strictly freshwater. Biostratigraphic changes in both diatom and chironomid assemblages from Lake Stowell occurred more or less simultaneously throughout the record in response to long‐term changes in climate forcings, such as temperature. Increases in cold‐adapted diatom (Staurosirella pinnata, Staurosira construens, Staurosirella dubia) and chironomid (Sergentia) taxa between 12,900 and 11,700 cal yr BP coincided with Younger Dryas cooling, suggesting a direct link with summer temperature. Shifts in aquatic biota also reflected indirect mechanisms through which climate affected the Lake Stowell ecosystem, for example, by altering thermal stratification, disturbance regimes, and nutrient concentrations. For instance, high summer insolation and warm summer temperatures from 11,700 to 8500 cal yr BP were associated with greater abundances of Stephanodiscus hantzschii and especially Aulacoseira subarctica. A concurrent opening of the forest canopy triggered by warming would have exposed the lake to strong winds and enhanced mixing, favoring these more heavily silicified taxa as an indirect consequence of climatic changes. Diatom assemblages appear to have been impacted by the deposition of Mount Mazama tephra at 7600 cal yr BP; a notable increase in Aulacoseira tenella suggests a response to increased silica availability in association with tephra deposition.

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Section: Sea-level History and Isolation Of Lake Stowellsupporting

confidence: 81%

“…, Roe et al. , Fedje et al. ) indicates that this diatom record could serve as a reliable indicator of paleo‐salinity.…”

Section: Resultsmentioning

confidence: 97%

Section: Diatom Responses To Holocene Environmental Changementioning

confidence: 99%

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Diatom responses to long‐term climate and sea‐level rise at a low‐elevation lake in coastal British Columbia, Canada

Neil

Lacourse

2019

Ecosphere

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“…Roe et al (2013) inferred a drop from about þ2.5 m amsl around 14 ka BP to þ1 m amsl by 13.2 to 13 ka BP followed by fluctuations between 0 and 1 m amsl for most of the Holocene (Fig. 6).…”

Section: Northern Cascadiamentioning

confidence: 98%

Post-glacial sea-level change along the Pacific coast of North America

Shugar

Walker

Lian

et al. 2014

Quaternary Science Reviews

126

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a b s t r a c tSea-level history since the Last Glacial Maximum on the Pacific margin of North America is complex and heterogeneous owing to regional differences in crustal deformation (neotectonics), changes in global ocean volumes (eustasy) and the depression and rebound of the Earth's crust in response to ice sheets on land (isostasy). At the Last Glacial Maximum, the Cordilleran Ice Sheet depressed the crust over which it formed and created a raised forebulge along peripheral areas offshore. This, combined with different tectonic settings along the coast, resulted in divergent relative sea-level responses during the Holocene. For example, sea level was up to 200 m higher than present in the lower Fraser Valley region of southwest British Columbia, due largely to isostatic depression. At the same time, sea level was 150 m lower than present in Haida Gwaii, on the northern coast of British Columbia, due to the combined effects of the forebulge raising the land and lower eustatic sea level. A forebulge also developed in parts of southeast Alaska resulting in post-glacial sea levels at least 122 m lower than present and possibly as low as 165 m. On the coasts of Washington and Oregon, as well as south-central Alaska, neotectonics and eustasy seem to have played larger roles than isostatic adjustments in controlling relative sea-level changes.

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“…However, many areas on Vancouver Island exhibit a similar general pattern following deglaciation of rapid marine regression with relative sea level falling below the modern shoreline by ~11,500 BP (~13,300 cal BP) and reaching a lowstand soon thereafter. In contrast with this general pattern, coastal areas adjacent to northeast Vancouver Island show relatively little postglacial isostatic adjustment (Roe et al 2013; Shugar et al 2014). Isostatic uplift or crustal forebulge in front of the glacial margin north of Vancouver Island subaerially exposed Cook Bank as a coastal plain near north Vancouver Island at 10,470±75 BP (RIDDL-985; 12,600–12,085 cal BP) (Clague 1983; Luternauer et al 1989), after which relative sea level dropped to ~95 m below modern at that location.…”

Section: Discussionmentioning

confidence: 99%

Body-size trends inPeromyscus(Rodentia: Cricetidae) on Vancouver Island, Canada, with comments on relictual gigantism

Steffen

2016

Paleobiology

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Large body size in Keen’s mouse, Peromyscus keeni, has been regarded as a relictual character that developed in times of geographic separation from P. maniculatus. However, body-size changes in Keen’s mouse have not been studied in detail. To address this problem the present paper compares the size of ancient and modern Peromyscus specimens from Vancouver Island. Results indicate that Late Pleistocene Peromyscus from Arch-2 Cave and early Holocene Peromyscus from Pellucidar Cave are significantly larger than those of modern P. maniculatus and P. keeni. Morphology and linear discriminant analyses support tentative assignment of several ancient specimens to P. keeni. Radiocarbon age estimates of 11,960±45 BP (14,004–13,637 cal BP) on a small mammal bone and 12,370±35 BP (14,695–14,148 cal BP) on Ursus arctos from Arch-2 Cave place these faunas on the island as relative sea level fell from a postglacial highstand, suggesting a local source for faunas with limited over-water dispersal capacities. Results of this study are consistent with insular relictual gigantism in Keen’s mouse, although some modification of the original hypothesis is needed to explain the smaller size of modern than ancient mice.

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Isolation basin records of late Quaternary sea-level change, central mainland British Columbia, Canada

Cited by 11 publications

References 75 publications

Diatom responses to long‐term climate and sea‐level rise at a low‐elevation lake in coastal British Columbia, Canada

Diatom responses to long‐term climate and sea‐level rise at a low‐elevation lake in coastal British Columbia, Canada

Post-glacial sea-level change along the Pacific coast of North America

Body-size trends inPeromyscus(Rodentia: Cricetidae) on Vancouver Island, Canada, with comments on relictual gigantism

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