The Chemical Oceanography of the Bras D'Or Lakes

Strain, Peter M.; Yeats, P. A.

doi:10.15273/pnsis.v42i1.3590

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…Certainly though, for those groups of organisms where they do have representation, they do not rank particularly high, with the exception of Baddeck Bay, where Black (1976) recorded his second highest number of fish species. Of the 4 areas that are fully represented, St. Patrick's Channel has the poorest variety of species, although Whycocomagh Bay, which was not sampled for copepods, is probably lower due to prevalent low oxygen at depth and low salinity near the surface (Petrie and Bugden, 2002;Strain and Yeats, 2002). Column headings as in Table X.…”

Section: Discussionmentioning

confidence: 99%

“…Primary Production Phytoplankton (planktonic plants) are very important in marine ecosystems, for they are the base food source upon which virtually all marine life depends. Geen (1965), Geen and Hargrave (1966), Wright (1976) and recently Strain and Yeats (2002) suggest that the level of phytoplankton growth (primary production) in the Lakes is low, since nutrient input was small. Strain and Yeats (2002) estimate that the contribution of sewage and other man-made sources of nutrients is minor; although, in some localised areas, such as barachois and the western end of Whycocomagh Bay there is sufficient build up, together with natural nutrients, to cause eutrophication (explosive growth of plant life which chokes waterways).…”

Section: Previous Studiesmentioning

confidence: 99%

“…A distinguishing feature of Whycocomagh Bay is the low level of oxygen in deep basins at each end of the Bay; the western one being completely anoxic (Petrie and Bugden, 2002;Strain and Yeats, 2002). Cod avoid these areas of low oxygen and aggregate at intermediate and shallow depths within the Bay.…”

Section: Fig 9ementioning

confidence: 99%

“…With the exception of restricted channels, there is little mixing between these layers except for winter months when higher winds and wave action disrupt the stability of this system. In some areas where currents and exchange rates are very low, the amount of dissolved oxygen can become quite depressed and in Whycocomagh Bay, anoxic (no oxygen) conditions exist (Petrie and Bugden, 2002;Strain and Yeats, 2002). A wide range of habitats, with bottom types ranging from rocky through gravel and sand to mud, can be found.…”

Section: Introductionmentioning

confidence: 99%

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Overview of the Ecology of the Bras d’Or Lakes with Emphasis on the Fish

Lambert

2002

Proc NSIS

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Section: Discussionmentioning

confidence: 99%

Section: Previous Studiesmentioning

confidence: 99%

Section: Fig 9ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Overview of the Ecology of the Bras d’Or Lakes with Emphasis on the Fish

Lambert

2002

Proc NSIS

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“…Insufficient food may result in lower survival or growth of lobsters in Bras d'Or Lake. For the Lakes as a whole, nutrient input is relatively low, resulting in a low level of primary production (Strain and Yates, 2002). Lobsters may be food-limited if this low primary production translates into low food for lobster larvae, or benthic food for juveniles and adults.…”

Section: Tolerances To Low Salinitymentioning

confidence: 99%

Large Epibenthic Invertebrates in the Bras D’or Lakes

Tremblay

2002

Proc NSIS

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The distribution of large epibenthic invertebrates (lobster and crabs, bivalve molluscs and echinoderms) in the Bras d’Or Lakes is reviewed, and possible limiting factors are identified. The review is based on published and unpublished studies, including recent trawl surveys directed at fish, and trapping studies directed at American lobster Homarus americanus and green crab Carcinus maenas. The reduced salinities within the Lakes probably limit the distribution of several species (rock crab Cancer irroratus, sea scallop Placopecten magellanicus and possibly American lobster), particularly during the more sensitive larval period. Lobsters and eastern oysters Crassostrea virginica serve to illustrate the multiple factors limiting epibenthic invertebrate distribution within the Bras d’Or Lakes. Lobsters are less abundant within the Bras d’Or Lakes than on the outer coast of Cape Breton Island. Possible reasons are the reduced salinity and limited cobble bottom substrate in the Bras d’Or Lakes, coupled with low food availability and low egg production. Low egg production may be the result of overfishing of lobsters in the past. The life history and physiology of the eastern oyster appears to be well suited to the areas of the Lakes with warm summer temperatures. The oyster populations in the Bras d’Or Lakes are limited by natural predators (e.g. starfish and green crab), competitors (e.g. blue mussel Mytilus edulis and M. trossulus), and overfishing. The green crab, a new arrival to the Bras d’Or Lakes, will likely have negative effects on bivalves such as oysters, but the overall effect of green crab on the Bras d’Or Lakes food web is difficult to predict. Recent trawl surveys indicate both sea urchins Strongylocentrotus droebachiensis and starfish are present in considerable abundance, but little is known about their ecological roles in the Bras d’Or Lakes.La distribution des grands invertébrés épibenthique (les homards et les crabes, les mollusques bivalves et les échinodermes) dans les lacs du Bras d’Or est examinée et les coefficients possiblement limitatifs sont identifies. La revue est basée sur des études publiées et non-publiées englobant les plus récentesétudes sur la pêche au chalut dirigées vers les poissons et les études sur la pêche aux casiers dirigées vers les homards américains Homarus americanus et les crabes verts Carcinus maenas. Salinités réduites dans les lacs du Bras d’Or limitent probablement la distribution de quelques espèces crabes roches Cancer irroratus, pétoncle géant Placopecten magellanicus et possiblement le homard américain, en particulier, pendent l’époque sensible du larvaire. Les homards et les huîtres de l’Est Crossostrea virginica montrent plusieurs facteurs coefficients limitatifs de la distribution des invertébrés épibenthique dan les lacs du Bras d’Or. Les homards sont moins abondants ici que sur la côte extérieure de L’Ille du Cap Breton. Des explications possibles sont la réduction de l’eau saline du pavé rond limite dans le substratum de lacs, ainsi que la pauvre disponibilité de mangé et la production basse des oeufs. Cette dernière est peut-être le résultat d’un trop grand prise de homards au passè. L’histoire et la physiologie des huîtres semblent être bien adaptés aux lieux des lacs de Bras d’Or, qui ont des temperatures chaudes dan l’été. La population des huîtres dans les lacs est limitée par des proies natures ( ie étoiles de mer et les crabes verts) compétiteurs ( ie. Moules bleus Mytilus edulis et M. trossulus) et une trop grande prise de poissons. Le crabe vert, une arrivée nouvelle dans les lacs du Bras d’Or va sans doute avoir des impacts négatifs sur les bivalues comme les huîtres, mais leurs impacts en general sur la chaîne nutritive est difficile à prédire. Les études les plus recents sur la pêche au chalut montrent qu’il y a ungrand nombre d’oursins de mer Strongylocentrotus droebachiensis et des étoiles de mer, mais on ne connait pas quel est leur rôle écologique dans les lacs du Bras d’Or.

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Mobilizing values: using perceptions of barachois ponds in Nova Scotia to advance informed management

Ross¹,

Fanning²

2021

FACETS

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Meaningful engagement is increasingly used as a management tool for understanding the multitude of complex values and potential conflicts around marine conservation and the production of conservation strategies deemed acceptable by local communities. Barachois ponds, akin to coastal lagoons, are recognized coastal wetlands in Nova Scotia, Canada, given their distinct ecosystem services, including provisioning, regulating, and cultural services. This study examines the current discourses around the management of barachois ponds and how an increased understanding of these perceptions held by stakeholders and managers might be used to better inform integrated management of these wetland ecosystems. A mixed-methods research design using Q methodology was employed to acquire data on social perceptions surrounding the management of barachois ponds fringing the Bras d’Or Lake in Cape Breton, Nova Scotia, Canada. Four dominant perspectives were identified: the leave-them-be conservationists, the sustainable developers, the management reformists, and the science-based conservationists. Six key issue themes emerged based on an in-depth examination of these different perspectives and Q sort data. This study found that an increased awareness of the ecological, social, and cultural values attributed to barachois ponds by key stakeholders could play a critical role in better informing wetland management decision-making in Nova Scotia and elsewhere.

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The Chemical Oceanography of the Bras D'Or Lakes

Abstract: Chemical oceanography of the Bras D'Or Lakes

Cited by 6 publications

References 12 publications

Overview of the Ecology of the Bras d’Or Lakes with Emphasis on the Fish

Overview of the Ecology of the Bras d’Or Lakes with Emphasis on the Fish

Large Epibenthic Invertebrates in the Bras D’or Lakes

Mobilizing values: using perceptions of barachois ponds in Nova Scotia to advance informed management

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