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Northwest Atlantic (northwest + atlantic)
Selected AbstractsIsolation and characterization of eight microsatellite loci for white hake (Urophycis tenuis)MOLECULAR ECOLOGY RESOURCES, Issue 3 2006J. SEIBERT Abstract Eight tetranucleotide microsatellite loci were characterized for white hake, Urophycis tenuis, a commercially exploited demersal gadoid fish distributed in the Northwest Atlantic. The eight loci are polymorphic with number of alleles and observed heterozygosities ranging from seven to 40 and from 0.544 to 0.978, respectively, in samples of between 39 and 47 individuals collected from throughout the species range. These loci were developed for population genetic studies. [source] Canadian Foreign Policy and Straddling Stocks; Sustainability in an Interdependent WorldPOLICY STUDIES JOURNAL, Issue 1 2000Alexander Thompson Canada cannot manage Straddling fish Stocks, which extend beyond Canadian waters into the high seas, without an effective foreign fisheriespolicy. This article examines the politics andfate of two such Stocks in the Northwest Atlantic; cod and Greenland halibut. More successful management of Straddling Stocks, I argue, can be achieved if enforcement policies eure conducted within theframework of multilateral ftsheries organizations. By appealing to the rules and Information provided by these Institutions, Canadian governments canpursue more aggressive and proactive fisheries policies while maintaining a high level ofpolitical support at hörne and abroad. [source] Marine fish diversity on the Scotian Shelf, CanadaAQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS, Issue 4 2003Nancy L. Shackell Abstract 1.Marine life in offshore regions has not been fully censused, yet related conservation policy relies on our ability to identify areas of high biodiversity. 2.We assessed the census of marine finfish on the Scotian Shelf, Northwest Atlantic using data collected during annual research vessel surveys between 1970 and 2000. The species accumulation curve did not reach an asymptote reflecting that new species continued to be discovered throughout the survey period. Only 0.12% of the area of the Scotian Shelf has been sampled since 1970. 3.Since 1974, when over 50% of the species had been discovered, the community composition has been relatively constant. However, the dominance structure has changed dramatically as reflected in the geographic contraction of the formerly abundant, large-bodied piscivores concomitant with the geographic expansion of their prey species. 4.The region is under-sampled, and species' distribution and abundance are changing. A precise estimate of diversity is elusive. As an alternative, we searched for physical correlates of finfish diversity to identify its possible surrogates. Surrogates have potential both as a method for understanding process and as a tool for conservation management. We examined the effect of area and depth range on species richness. High species richness was associated with larger areas and greater depth range at large spatial scales. 5.Highly diverse areas include the Bay of Fundy, the Eastern Gully, the slopes, Western Bank and the northeastern shelf. Until now, the northeastern shelf has been under-appreciated as a highly diverse area. Such information will be important for environmental impact assessments as well as selection of ,sensitive' or protected areas. Copyright © 2003 John Wiley & Sons, Ltd. [source] The relationship between stomach contents and maturity state for major northwest Atlantic fishes: new paradigms?JOURNAL OF FISH BIOLOGY, Issue 4 2001J. S. Link Iteroparous species examined from the northwest Atlantic demonstrated distinct relationships between feeding and reproduction. Two species showed an increase in feeding during the developing, ripe and running stages of reproduction, indicative of the ramper pattern. Four species showed an increase in feeding after spawning in the spent or resting stage of reproduction, indicative of the rester pattern. Two species exhibited no distinct pattern. Evidence from other species confirms these major patterns. This information may be useful to determine the effectiveness of different management measures, particularly in relation to feeding or spawning aggregations. There are two major feeding-reproductive patterns for fishes along a continuum of possibilities. [source] Eight polymorphic microsatellite loci for bottlenose dolphin and other cetacean speciesMOLECULAR ECOLOGY RESOURCES, Issue 4 2002Marthajane Caldwell Abstract We developed eight polymorphic microsatellite loci that can be used to elucidate population structure and aid management of bottlenose dolphins, Tursiops truncatus, in the northwest Atlantic. These loci averaged nine alleles, with no evidence for null alleles. Their cross-species utility was examined in Cephalorhynchus commersonii, Delphinus delphis, Delphinapterus leucas, Eschrictius robustus, Globicephala macrorhynchus, Lagenorhynchus obliquidens, Orcinus orca, Steno bredanensis and Stenella clymene. On average, 75% of the loci were polymorphic in these species (range = 50,88%). Our results indicate that these loci will be useful for elucidating population structure of bottlenose dolphin as well as of other cetacean species. [source] | ||||||||||