Remote sensing of coastal sea-surface features off Northern British Columbia

Jardine, Ian D.; Thomson, Keith A.; Foreman, Michael; LeBlond, Paul H.

doi:10.1016/0034-4257(93)90083-a

Cited by 13 publications

(6 citation statements)

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“…However, Jardine et al (1993) show that during spring tides the waters in this region have a stratification parameter appropriate for the formation of fronts, but not appropriate for complete vertical mixing of the water. Therefore some of the cooling can be attributed to mixing.…”

Section: Water Mass Analysismentioning

confidence: 91%

“…In a separate study to examine persistence of thermal features in five years of AVHRR data between 1987 and 1991, Jardine et al (1993) noticed that a warm patch formed in most years in late summer over Middle Bank. It appears that in these two images from 1990 we are observing the formation of this warm patch in late July.…”

Section: Windmentioning

confidence: 99%

“…Generally, average summer transport (June to September 1983) through Hecate Strait was not significantly different from zero, while the fluctuations in the transport were about 0.3 Sverdrups (= 0.3 x 10 6 m 3 s" 1 ). Jardine et al (1993) examined several years of infrared imagery from NOAA satellites, finding persistent warm waters in summer over Middle Bank and over Dogfish Banks along the west side of northern Hecate Strait. Thomson (1989) reviews the physical oceanography of this region up to the 1980s; Tabata (1980) provides a summary of data available prior to 1980; and Dodimead (1980) presents early measurements of temperature and salinity.…”

Section: Introductionmentioning

confidence: 99%

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Oceanographic features of Hecate Strait and Queen Charlotte Sound in Summer

et al. 1995

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Section: Water Mass Analysismentioning

confidence: 91%

Section: Windmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oceanographic features of Hecate Strait and Queen Charlotte Sound in Summer

et al. 1995

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“…insidc waters (Crawford, 1997). Most of our samples were taken in areas that typically have stratified water, although this varies temporally (Foreman et al, 1993). Fronts may form in both the QCI and PRD survey areas (Jardine et ul., 1993).…”

Section: Johnstone Struits and Vicinitymentioning

confidence: 99%

“…These are separated by the outflow of the Skeena River, but in the 2 survey years, larvae spread continuously between these spawning sites. Larval distributions in the Hecate Strait area occurred in areas characterized both as stratified and transitional waters (Jardine et al, 1993). The larval distributions identified did not correspond to areas of increased zooplankton concentration (Perry & Waddell, 1997)…”

Section: Hecate Straitmentioning

confidence: 99%

Larval distribution, abundance, and stock structure of British Columbia herring

Hay

McCarter

1997

Journal of Fish Biology

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Pacific herring Clupea palhsi spawn in shallow and intertidal areas. Larval distributions and abundance of three major and several minor stocks were examined to determine if larvae mix among different spawning locations. The surveys were short, intensive, and occurred mainly within the first 30 days of larval life. Each major stock had a discrete larval distribution with continuous larval distributions within stock boundaries. Some overlap of distributions occurred among smaller stocks. Most larvae were found in inshore waters but there were no obvious oceanographic factors, such as fronts or eddies, to explain all the distributions. Estuarine circulation in inlets could promote larval retention in some areas. The results support the present geographic definitions for local herring stocks. The results are generally consistent with the concept of discrete larval distribution, including retention areas, as the basis for herring stock structure. Pscific &as Britiah Columbir Pacific Ocean FIG. I . The British Columbia coast with polygons showing the five major stock groups (QCI, PRD, CC, WCVI, GS) plus the locations of smaller Inlet stocks that were examined in the surveys. The Ahaded circles represent the locations of major spawning sites and the size of the circles is proportional to the cumulative spawn index from 1936-1966 (see Table 1 ) Thc numbers refer to the approximate positions of different herring sections ( Table 1).clusters of distinct spawning sites. As in other parts of the world, there has been an enduring interest about stock structure in Pacific herring (Tester, 1937(Tester, , 1949 Grant, 1981;Kobayashi, 1993). Some of the earliest surveys on Pacific herring larvae were used to comment on stock structure (Stevenson, 1962). This paper presents results of larval surveys conducted from 1985 to 1994 and relates larval distribution and abundance to the distribution and intensity of spawning. The larval distributions are examined relative to the present defined stocks and the prominent oceanographic features of each survey area. MATERIALS AND METHODSHERRING SPAWNING DATA-LOCATIONS AND MEAN DATES Data on the date, location and abundance of herring spawn have been collected throughout the British Columbia coast for more than 65 years (Table I ) (Hay & PACIFIC HERRING LARVAE 157 FIG. 2. General locations ofthe larval surveys, conducted from 1985 to 1994. Each station is indicated by a small cross. Names correspond to locations mentioned in the text. The surveys in the QCI and PRD rectangles were made in 1985-1986, GS surveys were made from 1989 to 1992 and inlets surveys were made in 1994. LH indicates locations of lighthouses.Kronlund, 1987). Eggkpawning data is collected for over 100 sections along the BC coast (Fig. I).SAMPLING VESSELS AND SAMPLING GEAR Larval samples were collected with 57-cm diameter (or 0.25-m2) bongo nets, weighted with 86 kg wt, hauled from 20-70 m research vessels, G. B. Reed, Vector, W. E. Rickrr or Culigus in deep-water locations and with smaller, 19-cm diameter (280-cm2) bongo n...

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Quantifying marine mammal hotspots in British Columbia, Canada

et al. 2017

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Abstract. Global biodiversity is undergoing rapid decline due to direct and indirect anthropogenic impacts to species and ecosystems. Marine species, in particular, are experiencing accelerated population declines leading to many species being considered at risk by regional, national, and international standards. As one conservation approach, decisions made using spatially explicit information on marine wildlife populations have the potential to facilitate recovery and contribute to national and international commitments toward conservation targets. Delineating areas of intense use by species at risk can inform future marine spatial planning and conservation efforts, including the identification of marine protected areas. Methods for detecting hotspots (e.g., areas with high density and/or abundance) enable categorical mapping of the most intensely used areas. Yet, many of the current methods for delineating hotspots, such as the top 5% threshold, are subjective and fail to account for spatial patterns. Our goal was to map spatially continuous distributions of marine mammal densities and employ quantitative statistical methods to extract hotspot locations on the northern coast of British Columbia. We integrated systematically surveyed species information with environmental variables using generalized additive models to predict marine mammal distribution and density. Hotspots were identified from the density surfaces using two approaches: aspatial top 5% method and spatially local G i Ã statistic using three neighborhood definitions.Heterogeneous density patterns were observed for all species, and high-density regions were generally clustered in areas exhibiting oceanographic characteristics that may promote concentrated food resources. Combining species density surfaces and extracting hotspot locations identified regions important to multiple species and present candidate locations for future conservation efforts. Contributions from this research provide robust statistical methods to objectively map hotspot locations and generate GIS data products for informing coastal conservation decisions.

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Remote sensing of coastal sea-surface features off Northern British Columbia

Cited by 13 publications

References 13 publications

Oceanographic features of Hecate Strait and Queen Charlotte Sound in Summer

Oceanographic features of Hecate Strait and Queen Charlotte Sound in Summer

Larval distribution, abundance, and stock structure of British Columbia herring

Quantifying marine mammal hotspots in British Columbia, Canada

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