Abstract Manganese (Mn) exposure can cause parkinsonism. Pathological changes occur mostly in the pallidum and striatum. Two patients with a long history of occupational Mn presented Mn‐induced In one patient, magnetic resonance imaging (MRI) showed findings consistent exposure, concentration was increased blood urine. However, this patient's clinical features were typical idiopathic Parkinson disease (PD). Previous pathological positron emission tomography studies indicate that striatal...

We tested three hypotheses used to explain the increase in young-of-the-year (YOY) Atlantic salmon ( Salmo salar ) density with habitat complexity: territory-size, predator-refuge, and foraging-benefits hypotheses. manipulated complexity different treatments (boulder-removed, control, boulder-added) at eight sites Catamaran Brook Little Southwest Miramichi River, New Brunswick. The of juvenile was two times higher boulder-added treatment than other treatments. Our data were consistent...

Under natural conditions, both young‐of‐the‐year (YOY; 0+ year) and parr (1+ Atlantic salmon Salmo salar exhibited strong antipredator behaviour ( e.g. increase in latency to resume foraging) following the exposure damage‐released chemical alarm cues relative a stream water control. Subsequent novel visual stimulus had contrasting results. Parr increased their reactive distance if they been previously exposed cue, whereas YOY did not. On other hand, took significantly longer foraging when...

Although electrosedation is becoming a frequently used technique to anaesthetize fish for variety of commercial, management, and research applications, limited information available on the effectiveness different settings (e.g., voltage, frequency, shocking duration) target species. We examined recovery times short-term survival while using commercially electroanaesthesia unit prepare fishes transmitter implantation surgeries ran experimental tests without surgery settings. Our results...

Fish rely on both chemical and visual cues to evaluate predation risk. Decisions with respect activity partitioning in time (i.e., night vs. day) accurate assessment of risk relative energy intake; is generally thought be lower at the expense feeding opportunities. At night, sensory complement model predicts greater reliance perception Under this condition, a ability use vision should result more conservative response than during day. We tested hypothesis under natural conditions by...

Experimental studies evaluating the effects of food availability on movement free-ranging animals generally involve supplementation rather than suppression.Both approaches can yield similar insights, but we were interested in potential for using suppression management and control invasive predators, particular, brown treesnake (Boiga irregularis) Guam.However, understanding a species' response to resources is critical before employing such strategy.We studied movements 24 radio-tagged B....

Uncontrolled biological invasions are reducing freshwater ecosystem diversity and resilience. Research is needed to evaluate whether non-structural deterrents feasible within lock or canal environments. This study examined common carp (Cyprinus carpio) buffalo hybrid (Ictiobus) movement patterns in response acoustic stroboscopic deterrents. Twelve strobe lights one underwater speaker were deployed across the centre of a ship slip, with an environment analogous navigation canal. Common (n =...

We examined whether juvenile Atlantic salmon ( Salmo salar ) in the wild adjust their behaviour response to chemical cues of predator activity during a 4-week period after emergence from gravel nests. In each seven 75 m 2 sites Catamaran Brook, New Brunswick, Canada, we established three contiguous sections differing perceived by releasing stream water control sections, conspecific alarm risky and nothing buffer both 2006 2007. As predicted, density young-of-the-year (YOY) tended decrease...

2008년부터 2009년까지 제주도 연안 해역에서 혼획 및 좌초 되는 바다거북의 모니터링을 실시하였다. 그 결과 푸른바다거북(C. mydas) 12마리, 붉은바다거북(C. caretta) 3마리, 매부리바다거북(E. imbricata) 1마리, 미확인 종 25마리 등 총 41마리의 바다거북이 2년 동안 관찰되었다. 월별 해역별로는 8월에 북서부 연안의 애월읍 빈도가 높았고 2008년 보다 2009년도에 증가하는 경향을 나타내었다. 특히 북부 해안에 위치한 연속적으로 출현 개체 수가 것으로 보아 이 지역은 색이장 생육장이 되고 있을 추측된다. 어구별로는 정치망과 자망에서 주로 되었으며, 수동적 어구 형태인 정치망의 혼획이 높은 먹이를 쫓아가다가 혼획되는 판단된다. 이번 연구를 통하여 앞으로도 해역에 출현하는 개체수는 점차 증가할 예측되어 체계적인 모니터링 시스템 구축이 필요할 Bycatch and stranding of sea turtles from Jeju coastal...

Abstract Dust produced from mining has the potential to reduce plant cover, alter communities, and increase metal concentrations in vegetation—changes that may affect amount, type, quality of forage for barren‐ground caribou ( Rangifer tarandus groenlandicus ). We quantified dust deposition Diavik Diamond Mine (Northwest Territories, Canada) investigated changes on quality, quantity caribou. From 2002 2016, was measured, vegetation cover richness were assessed permanent plots established...

When dealing with invasive fishes, permanent barriers may inhibit spread, but not be feasible due to costs and logistical constraints. Alternatively, non-permanent using electricity, light, sound, pressure, bubbles, CO2 are being developed deployed in efforts limit prevent the spread of aquatic species or achieve fish guidance conservation. However, effectiveness these is quite variable testing often lacking for both native species. We conducted a laboratory experiment investigate impact...

The diel activity patterns of fishes in a temperate New Brunswick stream were studied during the summer over 5 years. Young‐of‐the year Atlantic salmon Salmo salar and blacknose dace Rhinichthys atratulus more active day than at night, whereas lake chub Couesius plumbeus , brook trout Salvelinus fontinalis adult white suckers Catostomus commersonii night day. Because as likely to be nocturnal diurnal, data suggest that night‐time sampling is needed provide an unbiased view fish community...

The movement of fish can be regulated by behavioural manipulation through non-physical barrier systems. Aquatic invasive species are becoming one the major management issues in North America, and threaten native aquatic ecosystems, including freshwater fish. Placements barriers waterways help disrupt This study examined effect a strobe-light stimulus on avoidance behaviour two proxy species, juvenile common carp (Cyprinus carpio) channel catfish (Ictalurus punctatus), controlled laboratory...

This study was investigated seasonal variation and species composition of fish at artificial reefs (octangle three-stage compartment type dice type)and natural rock in the Shinyang-Ri coastal waters off Jeju Island with visual census method January 2009, April July September December March 2010, June 2010. A total 44 occurred, dominant were Apogon semilineatus, Chromis notata, Trachurus japonicus, Sebastes thompsoni doederleini. The number individuals fishes higher 2009 however, lower 2010...

In this article, we present a novel underwater monitoring system based on the hyperspectral imager. This consists of commercial camera and white-colored LED lighting. We evaluated performance proposed imaging by conducting small scale experiments to identify difference two different oil samples. For classification between samples seawater, analyzed spectrum profiles oils seawater. Though that, can clearly not only distinguish from seawater but also bunker C lubricating oil. result shows...

Floc size analysis is one of the major processes in bio-flocculant efficiency determination, which critical for microalgae harvesting. Till now flocculation has been performed by using photospectrometry. In this conventional method, optical density a sample measured time interval collecting from fixed point container, up to ~5 hrs observation period. This consuming process may not guarantee viability algae, limits efficient To address issue, we introduce real monitoring system based on...