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Proposes the use of fuzzy cluster membership weights for ranking species important in a classification of the sampling unit, using crustacean-zooplankton data from Lake Simcoe in Ontario. Identification of elements of interannual and spatial variability in the crustacean zooplankton; Other aspects of crustacean zooplankton community structure.

Examines the changes in the zooplankton community of the British Columbia continental margin, 1985-1999, and their covariation with oceanographic conditions. Regional oceanographic setting; Sampling and laboratory processing; Changes in zooplankton biomass and community composition; Water property climatology and anomalies.

Examines the horizontal transport of marine organisms resulting from interaction between diel vertical migration and numerically generated tidal and buoyancy currents for the southern continental shelf and slope of Vancouver Island, Canada. Hypothesis that the mechanism is partially responsible for an observed decline in zooplankton biomass on the shelf during spring and summer; Use of a three-dimensional baroclinic finite element model.

Investigates the effects of experimental otter trawling on the macrofauna of a sandy bottom ecosystem on the Grand Banks of Newfoundland. Sediment organic carbon, nitrogen, and carbon to nitrogen ratio; General description of the macrobenthic community; Comparison of corridors A and B before trawling.

Reports on the results of tagging experiments of Pacific herring (Clupea pallasi), conducted from 1936 and 1992 in British Columbia. Homing, geographic fidelity, and straying; Distribution of spawning sites in B.C. herring; Description of herring tagging projects in B.C.; Estimation of the number of years-at-large.

Describes a multivariate, predictive model based on the reference-condition approach for the Fraser River catchment in British Columbia. Study area and sampling sites; Assemblage metrics; Taxonomic resolution.

We examined spatial patterns of covariation in indices of survival rate (residuals from the best-fit stock- recruitment curve) across four decades among 43 wild pink salmon (Oncorhynchus gorbuscha) stocks from 14 geographical regions in Washington, British Columbia, and Alaska. We found strong evidence of positive covariation among stocks within each region and between certain adjacent regions (e.g., correlations from 0.3 to 0.7) but no evidence of covariation between stocks ofdistant regions (e.g., separated by 1000 km or more). This suggests that important environmental processes affecting temporal variation in survival rates of pink salmon from spawners to recruits operate at regional spatial scales rather than at the larger ocean basin scale. Based on limited fry abundance data, we found that this covariation in spawner-to-recruit survival rates may be strongly influenced by marine processes. [ABSTRACT FROM AUTHOR]

An age-structured population dynamics model, incorporating interactions between Atlantic cod (Gadus morhua), the fishery, and the grey seal (Halichoerus grypus) population, was applied to the cod stock off eastern Nova Scotia (Northwest Atlantic Fisheries Organization Divisions 4Vs and 4W, commonly abbreviated to 4VsW), a stock that has dramatically declined since the late 1980s. Mortality was modeled as having three components: fishing mortality (F), seal predation (Mp), and all other sources of natural mortality (M). Specifically, Mwas assumed to be distinct for immature cod (ages 1-4; Mi) and mature cod (age 5 and older; Mm), and respective annual variations were estimated. Parameters estimated also included recruitment (cod abundance at age 1; R), F, and Mp. Based on our estimates of F, Mp, and M, it is unlikely that the collapse of the 4VsW cod stock can be attributed to a sudden increase inM; fishing appears to have been the primary cause for the stock's decline. However, after the moratorium on commercial fishing in 1993, increasing Mp and Mm and low R may have contributed to the failure of the 4VsW cod stock to recover. [ABSTRACT FROM AUTHOR]

Stable isotope analysis of the potential prey and predator can be combined with gut content analysis to quantify the diet. This dietary knowledge allows the quantitative assessment of the role of key species in energy and contaminant transfer, their impact on prey communities, and their susceptibility to perturbation. The diet of Mysis relicta was examined in Lake Ontario in spring, summer, and autumn using both techniques. Mysids fed on the bottom during the day and in the pelagia and on the bottom at night. A trophic fractionation of 2.2‰ N between mysids and their prey provided the best correspondence between the observed stable isotope signature of mysids and that estimated from their diet. Tissue turnover rate of δ[sup 13] C was slow compared with that of δ[sup 15] N. Diatoms formed 50% of the assimilated diet in May. In September, 25% of large mysids feeding on the bottom contained amphipod parts and 20% contained phytoplankton. The remainder of the diet consisted of zooplankton and rotifers. The contribution of amphipods and phytoplankton could not be quantified. Revised daily consumption estimates, based on this new diet information and clearance rate estimates of consumption, gave daily consumption estimates similar to those estimated from previous bioenergetic modelling.L'analyse des isotopes stables chez les proies et les prédateurs potentiels combinée à l'examen des contenus du tube digestif permet de quantifier le régime alimentaire. Cette information rend possible l'évaluation quantitative du rôle des espèces-clés dans le transfert de l'énergie et des contaminants, de leur impact sur les communautés de proies et de leur vulnérabilité aux perturbations. Le régime alimentaire de Mysis relicta au lac Ontario au printemps, à l'été et en automne a été analysé à l'aide de ces deux techniques. Le jour, les Mysis se nourrissent sur le fond, mais la nuit ils s'alimentent à la fois dans les zones pélagique et profonde. Un fractionnement trophique de 2,2‰ de l'azote entre les Mysis et leurs proies donne la correspondance optimale entre la signature d'isotopes stables observée chez les Mysis et celle estimée à partir de leur régime alimentaire. Le taux de renouvellement tissulaire du δ[sup 13] C est faible par comparaison à celui du δ[sup 15] C. Les diatomées constituent 50% de la nourriture assimilée en mai. En septembre, 25% des Mysis de grande taille à alimentation benthique ont des restes d'amphipodes dans leur tube digestif et 20% ont du phytoplancton. Le reste du régime alimentaire est composé de zooplancton et de rotifères. L'apport des amphipodes et du phytoplancton n'a pu être quantifié. Les taux révisés de consommation journalière, basés sur ces informations nouvelles et sur des estimations du taux de clearance de la consommation, donnent des estimations de consommation journalière semblables à celles obtenues à l'aide des modèles bioénergétiques antérieurs.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

Thousands of lakes in northeastern Ontario, Canada, have been acidified by sulphur deposition associated with emissions from the Sudbury area metal smelters. However, water quality improvements including increased pH and reduced sulphate concentrations have followed large reductions in Sudbury emissions that were implemented, beginning in the 1970s. Substantial decreases in Ca concentrations accompanied these other changes in lakewater chemistry. Monitoring of 38 lakes 20–128 km from Sudbury showed declines in Ca concentrations, averaging 2.7 µeq·L[sup –1] ·year[sup –1] , over the period 1981–1999. Declines were particularly apparent during the 1990s, averaging 3.8 µeq·L[sup –1] ·year[sup –1] . Paleolimnological reconstructions of the long-term Ca patterns in six lakes suggest that general lakewater Ca declines occurred through much of the 20th century. Comparison of recent measured Ca concentrations in 16 lakes with diatom-inferred pre-industrial Ca concentrations indicates that overall decreases in Ca have been large, averaging 74.6 µeq·L[sup –1] or 46%. Long-term Ca patterns may reflect a combination of factors including climatic changes, forest harvesting activities, and leaching by acid deposition, the effects of which we can not separate. Calcium declines have biological implications that will need to be considered in the development of appropriate targets as these lakes continue to recover from acidification.Des milliers de lacs du nord-est de l'Ontario, Canada, ont été acidifiés par les dépôts de soufre provenant des émissions des fonderies de la région de Sudbury. Cependant, les réductions importantes des émissions depuis les années 1970 ont entraîné une amélioration de la qualité de l'eau et, en particulier, un accroissement du pH et une diminution des concentrations de sulfates. Des réductions importantes des concentrations de Ca ont accompagné ces changements dans la chimie des eaux des lacs. Le suivi de 28 lacs situés à des distances de 20 à 128 km de Sudbury indique des déclins dans les concentrations de Ca d'en moyenne 2,7 µeq·L[sup –1] ·année[sup –1] de 1981 à 1999, particulièrement durant les années 1990 où les taux étaient en moyenne de 3,8 µeq·L[sup –1] ·année[sup –1] . Des reconstitutions paléolimnologiques de l'évolution à long terme du Ca dans six des lacs laissent croire que le déclin général du Ca dans l'eau des lacs s'est poursuivi pendant presque tout le vingtième siècle. Une comparaison des concentrations récentes de Ca dans 16 lacs avec les concentrations estimées d'après les peuplements de diatomées avant l'ère industrielle montre que le déclin de Ca a été important, en moyenne de l'ordre de 74,6 µeq·L[sup –1] ou de 46%. Cette évolution à long terme du Ca peut être le reflet d'une combinaison de facteurs, dont les effets ne peuvent être séparés, en particulier les changements climatiques, les activités de coupe des forêts et le lessivage dû aux précipitations acides. Les déclins du Ca ont des implications biologiques qu'il sera nécessaire de considérer dans la définition d'objectifs appropriés, à mesure que ces lacs se rétablissent de l'acidification.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]

Commercial catches of two ecologically distinct sympatric smelt (Osmerus mordax) populations segregated along the two shores of the St. Lawrence middle estuary exhibited inverse patterns with periodicities on the order of 30 years. The influence of water level in the St. Lawrence River and air temperature, chosen to reflect variations in hydrology and climate, differed markedly between the two populations. Analyses revealed that both water level and temperature were generally positively related with north-shore smelt landings and negatively related with south-shore smelt landings. For both populations, a number of significant climatic factors contributing to variance in smelt landings were lagged by one to three years relative to the year of landings, indicating that climatic variables influenced smelt recruitment. The contrasting role of hydroclimatic variables in driving these abundance cycles is likely related to differential exploitation of estuarine habitats; the south-shore population is associated with shallow shoal habitat, whereas the north-shore population is associated with deep channel habitat. The responses of the two smelt populations also reflect the fundamental ecological differences existing between shoal and channel habitats, indicating that future climate change may differentially affect other populations or species that are segregated between these two habitats.Les débarquements commerciaux de deux populations d'éperlans (Osmerus mordax) arc-en-ciel sympatriques, distinctes du point de vue écologique et ségréguées le long des deux rives de l'estuaire moyen du Saint-Laurent, montrent des variations cycliques inverses et une périodicité de l'ordre de 30 ans. L'influence du niveau d'eau du fleuve et de la température de l'air, choisis dans l'étude pour refléter les variations du régime hydrologique et du climat, diffèrent de façon marquée pour les deux populations. Les analyses révèlent que le niveau de l'eau et la température sont généralement corrélés positivement aux débarquements de la rive nord et négativement à ceux de la rive sud. Quelques un des principaux facteurs climatiques contribuant pour une grande part aux variations des débarquements des deux rives étaient décalés dans le temps, indiquant que les facteurs climatiques influencent le recrutement des éperlans. L'effet contrasté des variables hydroclimatiques sur les cycles d'abondance est vraisemblablement liée à l'utilisation différentielle des habitats de l'estuaire; la population de la rive sud est associée à un habitat peu profond et celle de la rive nord est à un chenal profond. Les réponses de ces deux populations d'éperlans reflètent aussi des différences écologiques existant entre des habitats peu profonds et un chenal profond, indiquant que les changements climatiques futurs pourraient avoir des effets différents sur d'autres populations ou d'autres espèces, qui sont ségréguées entre ces deux types d'habitats. [ABSTRACT FROM AUTHOR]

Examines the scaled chrysophytes preserved in modern and fossil sediment samples from lakes in Ontario. Evaluation of the changes in water quality; Determination of chrysophyte distributions using redundancy analysis; Introduction of a multi-indicator reconstruction model.

Examines the properties of abundance indices obtained from acoustic data collected by inshore herring gillnet boats in Pictou Island, Nova Scotia. Effect of survey design on the properties of abundance indices; Simulation of fishing survey protocols and random and systematic transect surveys; Properties of abundance indices.

Studies the distribution of modern diatom assemblages in surficial sediments of Labrador lakes across broad vegetational biomass in Canada. Relationships between species and environment; Development of transfer functions for paleoenvironmental reconstruction; Six catchment vegetation types.

Examines river periphyton and aquatic macrophytes' response to improved phosphorus and nitrogen removal at municipal wastewater treatment plants in Alberta. Biomass of periphyton and macrophytes; Total ammonia loading; Total dissolved phosphorus in river water.

Examines the effects of ultraviolet radiation (UVR) on net phosphorus (P) flux into phytoplankton communities in two boreal lakes at the Experimental Lakes Area, Canada. Manipulation of P available to and irradiance received by phytoplankton during incubations of dilution bioassays; Estimation of net P flux; Effect of UVR on total PP accumulation in enriched systems.

Estimates critical loads of acidity and the amount by which these critical loads are exceeded by atmospheric deposition, for 1469 lakes from five regions in south-central Ontario, using single lake chemistry measurements and sulphur deposition data for the period 1976-1999. Reduction in the portion of lakes with critical load exceedances due to the declining sulphur deposition.

Focuses on changes in phytoplankton abundance, biodiversity and community structure in three small Precambrian Shield boreal forest lakes in northwestern Ontario for several years before and after experimental watershed and shoreline clearcut logging operations and associated forest regeneration practices. Possible effects of forest harvesting within drainage basins; Data analysis; Total phytoplankton biovolumes in the three lakes.

Explores the consequences of high uncertainty in fish-habitat linkages and low classification complexity with regard to the potential effectiveness of decision making under the fish habitat policy of Canada. Models of net change of productivity of fish habitats; Results of Monte Carlo simulations.

Deals with a study determined whether average algal biomass differs for temperate and arctic lakes using published data on algal biomass, total phosphorus, total nitrogen, maximum depth, altitude, longitude and latitude in Canada. Background on climate models; Hypothetical framework; Analysis of the results.

Describes a simulation model, based on the compound binomial-gamma distribution, to assist the planning and design of groundfish trawl surveys in Canada. Background to the study; Biomass estimates; Discussion on binomial-gamma distribution; Sampling design; Discussion of results.

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Announces the 75th anniversary issue of the "Canadian Journal of Research," by the National Research Council of Canada. Scientific journals published by the NRC Research Press; Focus of the NRC Research Press journals; Partnership entered by NRC with other publishing organizations.

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This article presents information on the online submission of articles for the Canadian Journal of Fisheries and Aquatic Sciences in 2005.

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Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)