Investigating the performance of a roller footgear in the offshore shrimp fishery of Eastern Canada using underwater video

Climate change may affect the foraging success of bowhead whales Balaena mysticetus by altering the diversity and abundance of zooplankton species available as food. However, assessing climate-induced impacts first requires documenting feeding conditions under current environmental conditions. We collected seasonal movement and dive-behaviour data from 25 Eastern Canada-West Greenland bowheads instrumented with time-depth telemetry tags and used state-space models to examine whale movements and dive behaviours. Zooplankton samples were also collected in Cumberland Sound (CS) to determine species composition and biomass. We found that CS was used seasonally by 14 of the 25 tagged whales. Area-restricted movement was the dominant behaviour in CS, suggesting that the tagged whales allocated considerable time to feeding. Prey sampling data suggested that bowheads were exploiting energy-rich Arctic copepods such as Calanus glacialis and C. hyperboreus during summer. Dive behaviour changed seasonally in CS. Most notably, probable feeding dives were substantially shallower during spring and summer compared to fall and winter. These seasonal changes in dive depths likely reflect changes in the vertical distribution of calanoid copepods, which are known to suspend development and overwinter at depth during fall and winter when availability of their phytoplankton prey is presumed to be lower. Overall, CS appears to be an important year-round foraging habitat for bowheads, but is particularly important during the late summer and fall. Whether CS will remain a reliable feeding area for bowhead whales under climate change is not yet known.

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Updated Yield-per-Recruit Information on the Tortugas Pink Shrimp Fishery

North American Journal of Fisheries Management ◽

10.1577/1548-8659(1986)6<339:uyiott>2.0.co;2 ◽

1986 ◽

Vol 6 (3) ◽

pp. 339-343 ◽

Cited By ~ 1

Author(s):

Scott Nichols

Keyword(s):

Pink Shrimp ◽

Shrimp Fishery ◽

Yield Per Recruit

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Freshwater Fishes of Eastern Canada

10.3138/9781487583286 ◽

1954 ◽

Author(s):

W.B. Scott

Keyword(s):

Freshwater Fishes ◽

Eastern Canada

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СИСТЕМЫ СТАЦИОНАРНОГО ПОДВОДНОГО ВИДЕОНАБЛЮДЕНИЯ ПРИБРЕЖНЫХ АКВАТОРИЙ

Podvodnye issledovaniia i robototehnika ◽

10.37102/24094609.2020.31.1.008 ◽

2020 ◽

Author(s):

V.K. Fishchenko ◽

P.S. Zimin ◽

A.V. Zatserkovnyy ◽

A.E. Subote ◽

A.V. Golik ◽

...

Keyword(s):

Marine Biology ◽

Surveillance Systems ◽

Underwater Video ◽

Vital Activity ◽

Geographically Dispersed ◽

Video Recordings ◽

Underwater Cameras ◽

The Pacific ◽

External Conditions ◽

Marine Vessels

В Тихоокеанском океанологическом институте (ТОИ) ДВО РАН с 2012 г. ведутся разработки и исследования возможностей технологий стационарного подводного видеонаблюдения. Развернуты три подводныхкомплекса: два в бухте Алексеева (о-в Попова) и один в бухте Витязь (зал. Посьета). К настоящему времени накоплены значительные объемы информации в виде моментальных снимков и видеозаписей подводныхсцен. Разработаны интерфейсы для предоставления этой информации пользователям по каналам сети Интернет. Разработаны технологии поддержки работы территориально разнесенных экспертов, составляющихбиологические описания видеоматериалов, подобных тем, которые разрабатываются в ведущих зарубежныхорганизациях по морской биологии. Разработаны и апробированы методики оценивания по видеоинформации параметров жизнедеятельности некоторых видов морских гидробионтов. Благодаря непрерывностинаблюдения зафиксировано нескольких редких случаев, представляющих интерес для морских биологов. Разработаны и апробированы методики оценивания гидрологических характеристик среды на основе анализавидеотрансляций с подводных камер. Эти результаты представляются важными в контексте сопровождениянаблюдений за жизнедеятельностью морской биоты данными о внешних условиях, в которых она происходит. Продемонстрирована возможность использования звукового канала камер для регистрации и анализаакустических шумов от морских судов. Продемонстрирована возможность применения подводных видеокомплексов для организации экспериментов по изучению реакции морских гидробионтов на воздействие целенаправленных физических сигналов.Since 2012, the Pacific Oceanological Institute of FarEastern Branch of the Russian Academy of Science has beendeveloping and studying the capabilities of technologies ofstationary underwater video surveillance. Three of the underwatercomplexes have been deployed in different waterareas: two in the Alekseev Bay (Popova Island) and one inVityaz Bay (Posyet Gulf). At this point, complexes have accumulateda significant amount of data in the form of snapshotsand video recordings of underwater scenes, which canbe accessed through designed Internet-based interfaces. Allthe surveillance systems contain technologies as a support ofthe work of geographically dispersed experts involved in thebiological description of video materials, similar to ones developedin leading worldwide marine biology organizations.Besides, the estimation of vital parameters of some marinelife species by the video recordings can be performed usingdeveloped and tested methods. Thanks to continuous observation,the designed systems have already recorded severalrare cases of interest for marine biologists. Hydrologicalcharacteristics of surrounding media can be studied usingdeveloped and tested methods of analysis of video streamingfrom underwater cameras. These results are especially crucialfor accompanying observations of the vital activity ofmarine organisms with data on external conditions in whichthey occur. Cameras built-in audio channels can be used forrecording and analyzing noises of marine vessels. Designedunderwater video complexes provide an opportunity forconducting experiments on studying the reaction of marineorganisms to dedicated physical signals.

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Nanofiltration of colored surface water: Quebec's experience

Water Science & Technology Water Supply ◽

10.2166/ws.2003.0145 ◽

2003 ◽

Vol 3 (5-6) ◽

pp. 15-22

Author(s):

P. Kouadio ◽

M. Tétrault

Keyword(s):

Drinking Water ◽

Surface Water ◽

Membrane Fouling ◽

Pilot Scale ◽

Operating Conditions ◽

Quebec City ◽

Water Regulation ◽

Eastern Canada

Three colored surface water nanofiltration pilot-scale projects were conducted in the province of Quebec (eastern Canada), between November 2000 and March 2002, by the company H2O Innovation (2000) inc., for the municipalities of Lac Bouchette, Latulipe-et-Gaboury and Charlesbourg (now part of Quebec City). Results indicated that nanofiltration permeate quality has an advance on present drinking water regulation standard in Quebec, but important membrane fouling occurred. Fouling can be controlled by pretreatment and optimization of the operating conditions.

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EARTHQUAKE SOURCE PARAMETER AND FOCAL MECHANISM ESTIMATES FOR THE WESTERN QUEBEC SEISMIC ZONE IN EASTERN CANADA

10.1130/abs/2017am-305469 ◽

2017 ◽

Author(s):

Alba M. Rodriguez Padilla ◽

◽

John Onwuemeka ◽

Yajing Liu ◽

...

Keyword(s):

Focal Mechanism ◽

Earthquake Source ◽

Source Parameter ◽

Seismic Zone ◽

Eastern Canada

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CRUSTAL STRUCTURE OF EASTERN CANADA AND NE USA FROM AMBIENT NOISE TOMOGRAPHY

10.1130/abs/2020am-352845 ◽

2020 ◽

Author(s):

Omid Bagherpur Mojaver ◽

◽

Fiona Darbyshire

Keyword(s):

Crustal Structure ◽

Ambient Noise ◽

Ambient Noise Tomography ◽

Eastern Canada

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The High-Frequency Decay Slope of Spectra (Kappa) for M≥3.5 Earthquakes on Rock Sites in Eastern and Western Canada

Bulletin of the Seismological Society of America ◽

10.1785/0120190206 ◽

2020 ◽

Vol 110 (2) ◽

pp. 471-488 ◽

Cited By ~ 2

Author(s):

Samantha M. Palmer ◽

Gail M. Atkinson

Keyword(s):

Ground Motion ◽

Classical Method ◽

Vertical Component ◽

Western Canada ◽

S Wave ◽

Motion Modeling ◽

Eastern Canada ◽

General Observation ◽

Anelastic Attenuation ◽

Two Parameters

ABSTRACT Spectral decay of ground-motion amplitudes at high frequencies is primarily influenced by two parameters: site-related kappa (κ0) and regional Q (quality factor, inversely proportional to anelastic attenuation). We examine kappa and apparent Q-values (Qa) for M≥3.5 earthquakes recorded at seismograph stations on rock sites in eastern and western Canada. Our database contains 20 earthquakes recorded on nine stations in eastern Canada and 404 earthquakes recorded on eight stations in western Canada, resulting in 105 and 865 Fourier amplitude spectra, respectively. We apply two different methods: (1) a modified version of the classical S-wave acceleration method; and (2) a new stacking method that is consistent with the use of kappa in ground-motion modeling. The results are robust with respect to the method used and also with respect to the frequency band selected, which ranges from 9 to 38 Hz depending on the region, event, and method. Kappa values obtained from the classical method are consistent with those of the stacked method, but the stacked method provides a lower uncertainty. A general observation is that kappa is usually larger, and apparent Q is smaller, for the horizontal component in comparison to the vertical component. We determine an average regional κ0=7 ms (horizontal) and 0 ms (vertical) for rock sites in eastern Canada; we obtain κ0=19 ms (horizontal) and 14 ms (vertical) for rock sites in western Canada. We note that kappa measurements are quite sensitive to details of data selection criteria and methodology, and may be significantly influenced by site effects, resulting in large site-to-site variability.

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