The composition and spatial distribution of scavenging hyperbenthos in the Cape d'Aguilar Marine Reserve, Hong Kong

2011 ◽  
Vol 92 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Brian Morton ◽  
Christine N.W. Lee
Keyword(s):  
Spatial Distribution ◽  
Hong Kong ◽  
Marine Reserve ◽  
Spatial Segregation ◽  
The Other ◽  
Flow Rates ◽  
Baited Traps ◽  
Almost All ◽  
And Control

Baited traps with a 5 mm diameter opening were deployed 9 cm off the seabed in the Cape d'Aguilar Marine Reserve, Hong Kong. In contrast to analogous studies from boreal waters, lysianassoids accounted for 0.5% of the total number of trapped hyperbenthos. Species of Tisbe (Copepoda: Tisbidae), Ceradocus (Gammaridea: Melitidae), Nebalia (Leptostraca: Nebaliacea), unidentified benthic ostracods, Neanthes cricognatha (Polychaeta: Nereidae) and a species of Lepidepecreum (Amphipoda: Lysianassoidea) were caught in a decreasing order of numerical importance. A spatial segregation of trapped fauna was identified between the reserve's shallow Lobster Bay (<–2 m Chart Datum (CD)) and deeper-waters (between –6 and–17 m CD) outside it. Ceradocus sp. monopolized the trapped fauna in the former area, while the other species were caught almost exclusively from the latter. Insignificant Ceradocus sp. catch differences between baited and control traps suggested that they functioned only as ‘habitat traps’ for this species. Almost all other organisms attracted to the bait were hyperbenthic scavengers. Their absence from the shallows might be due to the coarser and lower organic contents of the sediments, also related to faster flow rates here. Finally, we confirm that in subtropical Hong Kong, lysianassid amphipods are not as significant hyperbenthic scavengers as they are in boreal waters.

scholarly journals Scavenging behaviour by Ergalatax contractus (Gastropoda: Muricidae) and interactions with Nassarius nodifer (Gastropoda: Nassariidae) in the Cape d'Aguilar Marine Reserve, Hong Kong

2006 ◽  
Vol 86 (1) ◽  
pp. 141-152 ◽  
Author(s):  
Brian Morton
Keyword(s):  
Hong Kong ◽  
Field Experiments ◽  
Marine Reserve ◽  
Flowing Water ◽  
Large Numbers ◽  
Baited Traps ◽  
Behavioural Characteristics ◽  
Shallow Subtidal ◽  
The Mean ◽  
Mean Time

Aspects of the feeding behaviour of Ergalatax contractus (Muricidae) were studied. Field experiments demonstrated that large numbers of individuals of this species, comprising ∼90% of a suite of gastropod scavengers, were attracted to baited traps in the subtidal sands of Lobster Bay, Cape d'Aguilar Marine Reserve, Hong Kong. Laboratory experiments identified the effective chemo-detection distances of E. contractus as 60 cm in still and >80 cm in flowing water, respectively. The average times to arrival at bait in still and flowing water were 92.3 and 69.0 min, respectively, but were significantly less for individuals experiencing a longer period of starvation. The mean time taken for E. contractus to consume a meal was 70.6 min.Comparisons were made between Ergalatax contractus and Nassarius nodifer, representative of a suite of sympatric scavenging nassariids in Lobster Bay. The nassariid arrived significantly faster at bait in both still (30.2 min) and flowing water (20.8 min) than E. contractus and fed faster (25.7 min), as is typical of representatives of the Nassariidae. Although the two species partition carrion resources temporally, manipulation experiments provided evidence for inter-specific competition between them. That is, although E. contractus possesses the morphological and behavioural characteristics of a predator, its opportunistic scavenging abilities have led to its success and numerical superiority on the shallow subtidal sands of Lobster Bay. The dominance of E. contractus in Lobster Bay, and elsewhere in Hong Kong, is unusual. Here, the normally predatory E. contractus, far outnumbers all other scavengers, possibly because of an enhanced, largely allochthonous, supply of food which it is able to exploit by virtue of its previously identified opportunistic habit of scavenging the leftovers of other predators. The presence of inter-specific competition between E. contractus and a sympatric suite of nassariids enhances, not impedes, carrion exploitation.

A new species of Nebalia (Crustacea: Phyllocarida: Leptostraca) from the Cape d’Aguilar Marine Reserve, Hong Kong

Zootaxa ◽  
2011 ◽  
Vol 3091 (1) ◽  
pp. 51 ◽  
Author(s):  
CHRISTINE N. W. LEE ◽  
ROGER N. BAMBER
Keyword(s):  
Hong Kong ◽  
New Species ◽  
Marine Reserve ◽  
Laboratory Culture ◽  
Baited Traps ◽  
The Subject ◽  
A New Species

A new species of leptostracan, Nebalia mortoni, is described from the waters of the Cape d’Aguilar Marine Reserve, Hong Kong. It is distinguished from previously described species in particular owing to the squared denticles on the posterior dorsal margins of the pleonites. The species has been collected using baited traps, and has been the subject of previous study of its behaviour and demography. Laboratory culture of immature males has revealed that passage to maturity involved a sudden and dramatic lengthening of the antennae within the space of a single moult. This is only the second description of nebaliacean species from Asia.

Temporal patterns of change in the necrophagous hyperbenthic zooplankton community of Lobster Bay, Cape d'Aguilar Marine Reserve, Hong Kong

2004 ◽  
Vol 84 (3) ◽  
pp. 531-538 ◽  
Author(s):  
Christine N.W. Lee ◽  
Brian Morton
Keyword(s):  
Organic Matter ◽  
Hong Kong ◽  
Life Cycle ◽  
Community Composition ◽  
Marine Reserve ◽  
Zooplankton Community ◽  
Seasonal Patterns ◽  
Baited Traps ◽  
One Year ◽  
Life Cycle Patterns

Crab-baited traps, with a 5-mm diameter opening, were deployed 90 mm off the seabed monthly at Lobster Bay, Hong Kong, for one year between 1998 and 1999. Visitors drawn to the traps were mainly species of Ceradocus (Gammaridea: Melitidae), Tisbe (Harpacticoida: Tisbidae) and Nebalia (Leptostraca: Nebaliacea). Apart from Ceradocus sp., all were scavengers with catches using baited traps significantly exceeding unbaited controls. Ceradocus sp. was apparently drawn to traps for refuge. The trapped scavenger community composition changed with deployment duration in the presence of bait. Nebalia sp., Neanthes cricognatha (Polychaeta: Nereidae) and Lepedepecreum sp. (Gammaridea: Lysianassoidea) were identified mostly two/three-days post-deployment, exhibiting a potential preference for rotten organic matter. Seasonal catches were also identified for all three visitors with maxima between October 1998 and April 1999. Such seasonal patterns might be related to either turbulence destabilizing the substratum during this period or life cycle patterns in the study area.

scholarly journals Impact of Travel Ban Implementation on COVID-19 Spread in Singapore, Taiwan, Hong Kong and South Korea During the Early Phase of the Pandemic: a Comparative Study.

2021 ◽  
Author(s):  
Sylvia Xiao Wei Gwee ◽  
Pearleen Chua Ee Yong ◽  
Min Xian Wang ◽  
Junxiong Pang
Keyword(s):  
Hong Kong ◽  
South Korea ◽  
Rate Of Change ◽  
The Other ◽  
Response Data ◽  
Travel Restrictions ◽  
Imported Cases ◽  
Almost All ◽  
The Impact ◽  
Local Transmission

Abstract Introduction: Since January 2020, the COVID-19 pandemic has elicited imposition of some form of travel restrictions by almost all countries in the world. Most of which persist to this day even as some restrictions have been gradually eased. It remains unclear if the trade-off from the unprecedented disruption to air travel was well worth in the course of pandemic containment.Methods: A comparative analysis was conducted on Singapore, Taiwan, Hong Kong and South Korea’s COVID-19 response. Data on COVID-19 cases, travel-related and community interventions, socio-economic profile were consolidated. Trends on imported and local cases were analyzed using computations of moving averages, rate of change, particularly in response to distinct waves of travel-related interventions due to the outbreak in China, South Korea, Iran & Italy, and Europe.Findings: South Korea’s travel restrictions consistently lagged in terms of timeliness and magnitude. The first wave of travel restrictions against China was implemented 34 days after the outbreak in Wuhan, compared to 22-26 days taken by Singapore, Taiwan and Hong Kong. Restrictions against all countries came after 91 days, compared to 78-80 days for the other three countries. Taiwan and Hong Kong were the most efficient in adopting travel restrictions. Singapore’s belated measures and higher importation risk as compared to the other three Asian countries manifested in its deteriorating local transmission. The rate of change of imported cases fell by 1.08-1.43 across all four countries following the first wave of intervention against China, and by 0.22-0.52 in all countries except South Korea in the fifth wave against all international travellers. Conclusion: Travel restriction was effective in preventing COVID-19 case importation in early outbreak phase. However, evidence of its effect on local transmission was lacking. The impact of travel restrictions in containing epidemics cannot be disentangled from local non-pharmaceutical interventions concurrently implemented. Overall, measures should be complementary, with more emphasis on the latter to contain the outbreak effectively.

A Review of Internet Addiction on the Basis of Different Countries (2007–2017)

2019 ◽  
pp. 215-235 ◽  
Author(s):  
Ruya Samli
Keyword(s):  
Hong Kong ◽  
Internet Addiction ◽  
Far East ◽  
The Other ◽  
The Internet ◽  
The Far East ◽  
The Subject ◽  
Almost All

This chapter presents a review of Internet addiction on the basis of different countries between the years of 2007 and 2017. For this purpose, the term “addiction” is explained, some addiction types are examined, the differences between Internet addiction and the other ones are given and the Internet addiction status of different countries are presented. In today's world, Internet addiction is a privileged problem in almost all of the countries but especially a few countries have important number of studies about the subject. The most studies are completed in China, Turkey, Taiwan, Hong Kong and Korea. In this chapter, studies about these countries and some other ones are investigated. These studies show that the “Far East” is suffering from the problem a bit more than the others.

A Review of Internet Addiction on the Basis of Different Countries (2007–2017)

2019 ◽  
pp. 23-43
Author(s):  
Ruya Samli
Keyword(s):  
Hong Kong ◽  
Internet Addiction ◽  
Far East ◽  
The Other ◽  
The Internet ◽  
The Far East ◽  
The Subject ◽  
Almost All

This chapter presents a review of Internet addiction on the basis of different countries between the years of 2007 and 2017. For this purpose, the term “addiction” is explained, some addiction types are examined, the differences between Internet addiction and the other ones are given and the Internet addiction status of different countries are presented. In today's world, Internet addiction is a privileged problem in almost all of the countries but especially a few countries have important number of studies about the subject. The most studies are completed in China, Turkey, Taiwan, Hong Kong and Korea. In this chapter, studies about these countries and some other ones are investigated. These studies show that the “Far East” is suffering from the problem a bit more than the others.

scholarly journals Impact of travel ban implementation on COVID-19 spread in Singapore, Taiwan, Hong Kong and South Korea during the early phase of the pandemic: A comparative study.

2021 ◽  
Author(s):  
Sylvia Xiao Wei Gwee ◽  
Pearleen Chua Ee Yong ◽  
Min Xian Wang ◽  
Junxiong Pang
Keyword(s):  
Hong Kong ◽  
South Korea ◽  
Rate Of Change ◽  
The Other ◽  
Response Data ◽  
Travel Restrictions ◽  
Imported Cases ◽  
Almost All ◽  
The Impact ◽  
Local Transmission

Abstract Introduction: Since January 2020, the COVID-19 pandemic has elicited imposition of some form of travel restrictions by almost all countries in the world. Most of which persist to this day even as some restrictions have been gradually eased. It remains unclear if the trade-off from the unprecedented disruption to air travel was well worth in the course of pandemic containment.Methods: A comparative analysis was conducted on Singapore, Taiwan, Hong Kong and South Korea’s COVID-19 response. Data on COVID-19 cases, travel-related and community interventions, socio-economic profile were consolidated. Trends on imported and local cases were analyzed using computations of moving averages, rate of change, particularly in response to distinct waves of travel-related interventions due to the outbreak in China, South Korea, Iran & Italy, and Europe.Findings: South Korea’s travel restrictions consistently lagged in terms of timeliness and magnitude. The first wave of travel restrictions against China was implemented 34 days after the outbreak in Wuhan, compared to 22-26 days taken by Singapore, Taiwan and Hong Kong. Restrictions against all countries came after 91 days, compared to 78-80 days for the other three countries. Taiwan and Hong Kong were the most efficient in adopting travel restrictions. Singapore’s belated measures and higher importation risk as compared to the other three Asian countries manifested in its deteriorating local transmission. The rate of change of imported cases fell by 1.08-1.43 across all four countries following the first wave of intervention against China, and by 0.22-0.52 in all countries except South Korea in the fifth wave against all international travellers. Conclusion: Travel restriction was effective in preventing COVID-19 case importation in early outbreak phase. However, evidence of its effect on local transmission was lacking. The impact of travel restrictions in containing epidemics cannot be disentangled from local non-pharmaceutical interventions concurrently implemented. Overall, measures should be complementary, with more emphasis on the latter to contain the outbreak effectively.

A Review of Internet Addiction on the Basis of Different Countries (2007–2017)

2018 ◽  
pp. 200-220
Author(s):  
Ruya Samli
Keyword(s):  
Hong Kong ◽  
Internet Addiction ◽  
Far East ◽  
The Other ◽  
The Internet ◽  
The Far East ◽  
The Subject ◽  
Almost All

This chapter presents a review of Internet addiction on the basis of different countries between the years of 2007 and 2017. For this purpose, the term “addiction” is explained, some addiction types are examined, the differences between Internet addiction and the other ones are given and the Internet addiction status of different countries are presented. In today's world, Internet addiction is a privileged problem in almost all of the countries but especially a few countries have important number of studies about the subject. The most studies are completed in China, Turkey, Taiwan, Hong Kong and Korea. In this chapter, studies about these countries and some other ones are investigated. These studies show that the “Far East” is suffering from the problem a bit more than the others.

scholarly journals Do reindeer aggregate on snow patches to reduce harassment by parasitic flies or to thermoregulate?

Rangifer ◽  
1998 ◽  
Vol 18 (1) ◽  
pp. 3 ◽  
Author(s):  
John R. Anderson ◽  
Arne C. Nilssen
Keyword(s):  
Climatic Conditions ◽  
The Other ◽  
Entire Surface ◽  
Trapping Period ◽  
Baited Traps ◽  
Defensive Behaviors ◽  
Significant Difference ◽  
A Minor ◽  
Almost All ◽  
Trap Catches

During warm, sunny days (Max. temp. 22 &deg;C to 25 &deg;C) C02-baited traps operated at sites on and off snow patches (SP's) in subarctic Norway caught significantly fewer culicids, simuliids and tabanids on snow in both 1985 and 1987. However, for overnight catches (18.30 - 07.30 h) there was no significant difference in the number of culicids caught on versus off SP's. Analysis of videotapes taken in 1987 showed that defensive anti-fly behaviors of reindeer on and off SP's remained low (&lt; 1/4 min) throughout the day. Based on reindeer anti-fly behaviors, harassment was greatest from 10.30 to 12.30 h (Norwegian Standard Time), but reindeer continued to aggregate on SP's while anti-fly behaviors were lowest (13.30 to 20.00 h). Groups of &gt; 150 animals often occupied the entire surface of a snow patch. At the fly densities and climatic conditions encountered it seemed apparent that reindeer intermittently used SP's primarily to thermoregulate following periods of foraging. Almost all reindeer remained on SP's from 11.00 to 12.30 h, but at other times between 08.00 and 19 00 h about half the herd (ca. 800 animals) foraged for about an hour while the other half aggregated on SP's. However, by 20.00 h, during the cooler period when trap catches of mosquitoes were increasing, almost all reindeer had moved off SP's. The small decreases in anti-fly defensive behaviors observed for reindeer on SP's versus animals foraging in snow-free areas indicated that their presence on SP's may have resulted in a minor, coincidental reduction in harassment. Significantly more tabanids were caught during the morning trapping period than at other times, and significantly more mosquitoes were caught during the evening/overnight trapping period than at other times.

Prothrombin Time Standardization: Report of the Expert Panel on Oral Anticoagulant Control

1979 ◽  
Vol 42 (04) ◽  
pp. 1073-1114 ◽  
Keyword(s):  
Prothrombin Time ◽  
Expert Panel ◽  
The Other ◽  
Rabbit Brain ◽  
Calibration Constant ◽  
Freeze Dried ◽  
The Mean ◽  
Point Of Intersection ◽  
And Control ◽  
Standardization Report

SummaryIn collaborative experiments in 199 laboratories, nine commercial thromboplastins, four thromboplastins held by the National Institute for Biological Standards and Control (NIBS & C), London and the British Comparative Thromboplastin were tested on fresh normal and coumarin plasmas, and on three series of freeze-dried plasmas. One of these was made from coumarin plasmas and the other two were prepared from normal plasmas; in each series, one plasma was normal and the other two represented different degrees of coumarin defect.Each thromboplastin was calibrated against NIBS&C rabbit brain 70/178, from the slope of the line joining the origin to the point of intersection of the mean ratios of coumarin/normal prothrombin times when the ratios obtained with the two thromboplastins on the same fresh plasmas were plotted against each other. From previous evidence, the slopes were calculated which would have been obtained against the NIBS&C “research standard” thromboplastin 67/40, and termed the “calibration constant” of each thromboplastin. Values obtained from the freeze-dried coumarin plasmas gave generally similar results to those from fresh plasmas for all thromboplastins, whereas values from the artificial plasmas agreed with those from fresh plasmas only when similar thromboplastins were being compared.Taking into account the slopes of the calibration lines and the variation between laboratories, precision in obtaining a patient’s prothrombin time was similar for all thromboplastins.

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