Microsatellite DNA provided evidence that Atlantic cod overwintering in inshore Newfoundland are genetically distinguishable from offshore. We compared variation five loci samples locations around Trinity Bay, Newfoundland, and an offshore region on the northern Grand Bank (North Cape). Cod collected were divided into two groups basis of antifreeze level blood: those with high levels presumed to have overwintered cold ( 2°C) waters. Fish differed fish allele sharing (δμ) 2 distances, while...

Allelic variation in six highly polymorphic microsatellite loci (mean heterozygosity, 86%) provided evidence that cod (Gadus morhua) the northwest Atlantic belong to multiple genetically distinguishable populations, and further genetic differences may also exist between northwestern southeastern aggregations within northern stock complex off Newfoundland. Cod were sampled from winter ranging Hamilton Bank Grand complex, Flemish Cap, Scotian Shelf, Barents Sea. Tests of allele frequency...

Variation at five microsatellite DNA loci scored in ≈ 1300 individuals provided evidence of genetic structure among 14 cod ( Gadus morhua ) populations spanning the range species northwest (NW) Atlantic. Using D A and SW measures distance, as well F ST R population structure, differences are revealed continental shelf scales (NE Newfoundland Shelf, Grand Banks, Flemish Cap, Scotian Georges Bank) where regions separated by submarine saddles, channels trenches. However, we also provide...

Le polymorphisme observe a six loci de microsatellites l'ADN chez des larves morue echantillonnees facon repetee, pendant une periode 3 semaines, sur le banc Occidental la plate-forme neo-ecossaise prouve l'existence plusieurs groupes heterogenes dans cette concentration larves. Les indications etaient fortes d'un defaut d'heterozygotie et ecart par rapport loi Hardy-Weinberg pour l'ensemble toutes les seule masse d'eau (eau crete, CW), mais non un sous-ensemble ces considere comme faisant...

Polymorphisms at five microsatellite DNA loci provide evidence that Atlantic cod Gadus morhua inhabiting Gilbert Bay, Labrador are genetically distinguishable from offshore on the north‐east Newfoundland shelf and inshore in Trinity Newfoundland. Antifreeze activity blood suggests Bay overwinter within Bay. also smaller (weight length) for their age consequently less fecund age, than elsewhere northern complex. The productivity recruitment potential of coastal off may thus be much lower or...

Sibship relationships within a naturally spawned cohort of Atlantic cod ( Gadus morhua) larvae on the Western Bank Scotian Shelf were investigated by likelihood ratio method that estimates is among individuals using microsatellite (DNA fingerprint) information. We found no evidence any temporal or spatial family structure from seven different sample collections taken at sequential time intervals during 21-d period sampling larval cohort. There was more related than across collections. Within...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 322:225-238 (2006) - doi:10.3354/meps322225 Day and night ichthyoplankton assemblages zooplankton biomass size spectrum in a deep ocean island wake Iain M. Suthers1,*, C. T. Taggart2, D. Rissik1, E. Baird3 1School of Biological, Earth & Environmental Science, University New South Wales, Sydney, Wales 2052,...

Analysis of nine tetranucleotide microsatellite loci for Atlantic herring at five locations in the Northwest including Bras d'Or Lakes shows considerable genetic variation and significant population structure within Coastal Nova Scotia management component, among coastal populations collected from Georges Bank. However, results are also consistent with gene flow across Gulf Maine. The magnitude differentiation between sample all others considered was sufficient to warrant further...

Calanus finmarchicus stage-C5 and C. hyperboreus stage-C4 diapausing in Scotian Shelf basins are high-quality food sources because they abundant high energy content. When combined, these two variables informative for quantifying density, carrying capacity transfer marine ecosystems. However, measuring content directly can be difficult expensive. Here, we present (caloric) estimates co-located copepod species; C5 C4 collected during late-summer when their is at or near the annual maximum. We...

Adult Atlantic cod (Gadus morhua) are known to produce antifreeze glycoproteins in response cold temperatures. Our laboratory studies demonstrated that blood plasma levels adult were positively correlated with the number of days they spent subzero water. Between April 1991 and June 1993, we monitored concentrations late juvenile Trinity Bay, Newfoundland, used results estimate how long had been exposed low water A consideration these data conjunction detailed temperature profiles area taken...

Spatial and temporal patterns of light attenuance, zooplankton abundance, larval fish assemblages observed at night in the flood tide wake a 2‐km‐wide, steep‐sided island within Great Barrier Reef lagoon (40–45‐m local depth) are compared with two simple models. Eddy upwelling is shown to be slow relative erosion, vertical entrainment, advection (EA) arising near flanks island, where currents were accelerated 1–2 m s −1 , approximately twice that free stream. Turbidity (particles <300‐µm...

Hydrophone recordings, made in the presence of North Atlantic right whales (Eubalaena glacialis) Bay Fundy during daytime July 1999, are used to determine characteristics recorded sounds. A spectrogram-based method was implemented discriminate whale sounds from background noise and time-frequency envelope primary harmonic spectrogram as basis for sound characterization. Sounds were typically (82%, n=45) 300- 600-Hz range with up- downsweeping modulations. Lower (<200 Hz) higher (>900...

In November and December 1992, Atlantic cod (Gadus morhua) larvae were most abundant at a convergent front located the periphery of well-mixed gyrelike water mass rotating near crest Western Bank (outer Scotian Shelf). Zooplankton wet biomass plankton abundance (272 529 μm size-classes) also higher in frontal region relative to adjacent masses. We used feature test hypothesis that regions are better condition than elsewhere. No significant differences triacylglycerol content (an index...

Gut contents were obtained from 1406 cod larvae 94 stations in seven water masses related to a gyre around Western Bank, Scotian Shelf, 22 November–16 December 1992. Initial samples from: well‐mixed over the bank crest (CW); surrounding convergent FRONT; relatively cold, fresh (CFW) largely east of CW; warmer, salty (WSW) west CW and FRONT. After storm on 3–6 December, CFW displaced south‐east and, after further winds 11–12 north‐west off bank. Zooplankton biomass (300–333 μm mesh, mostly...

The feeding ecology of the larvae silver hake Merluccius bilinearis was examined during two time periods (October 1998 and December 1992) on Western Bank, Scotian Shelf, north‐west Atlantic, compared with Atlantic cod Gadus morhua collected in same samples 1992. During both exhibited strong selection for late stage copepodids adult copepods at a small size (&gt;3·5 mm total length, L T ). niche width measured as diet breadth index ( I DB ) declined rapidly they increased remained relatively...

The groundfish collapse off Canada’s East Coast earlier this decade led to a change in the species that are commercially targeted. This recent is just latest series of shifts within Atlantic fisheries, which have resulted decrease mean trophic level at fisheries operate. Our study investigates subsequent changes level, calculated from historical catch statistics, and changing management priorities Newfoundland fishery twentieth century. report reviews 1900 through 1995, with an emphasis on...