scholarly journals On feeding of deep-sea crabs on the continental slope of northwestern Kamchatka

2016 ◽  
Vol 184 (1) ◽  
pp. 236-240
Author(s):  
Valery I. Chuchukalo ◽  
Victor A. Nadtochy ◽  
Vladimir V. Napazakov ◽  
Oleg Yu. Borilko ◽  
Sergei A. Nuzhdenko
Keyword(s):  
Gastrointestinal Tract ◽  
Continental Slope ◽  
Deep Sea ◽  
Frequent Occurrence ◽  
King Crab ◽  
Common Food ◽  
Tanner Crab ◽  
The Mean ◽  
Main Components

Mean index of gastrointestinal tract fullness for golden king crab Lithodes aequispinus is 15.5 ‱. Detritus occurs in 40.5 % of the cases, so it is a common food for this crab, Polychaeta, Ophiuroidea and Decapoda are 33.2 %, 32.1 % and 15.4 % of its ration, respectively, whereas Mollusca are only 11.5 % of the ration weight, despite of frequent occurrence. Triangle tanner crab Chionoecetes angulatus has the mean index of fullness 20.9 ‱, Polychaeta and Mollusca are two main components of its ration (31.4 % and 27.3 %, respectively) and Decapoda and Pisces are the secondary components (13.9 % and 12.2 %); detritus occurs in 11.2 % of the cases. Cannibalism is observed incidentally for the latter species.

scholarly journals Nutrition and some features of ecology of golden king crab Lithodes aequispinus and triangle tanner crab Chionoecetes angulatus in the waters of the North-Western Kamchatka in autumn

2016 ◽  
Vol 1 (2) ◽  
pp. 51-60
Author(s):  
V. I. Chuchukalo ◽  
V. A. Nadtochy ◽  
V. V. Napazakov ◽  
O. Yu. Borilko ◽  
S. A. Nuzhdenko
Keyword(s):  
Gastrointestinal Tract ◽  
Dietary Habits ◽  
Population Distribution ◽  
Trawl Survey ◽  
Food Bolus ◽  
King Crab ◽  
The North ◽  
Partial Indices ◽  
Tanner Crab ◽  
First Results

The behavior of animals, their population, distribution, rate of growth and maturation are determined mostly by the nature of nutrition. That’s why the knowledge of dietary habits and adaptations is necessary for a correct assessment of the food provision of animals, and it is an important link in the problem of population dynamics. This article is designated to fill data about golden king crab nutrition and to represent the first results of research of triangle tanner crab nutrition. The material for studying of food was the biological analysis of the gastrointestinal tract of 32 males of golden king crab and 143 males of triangle tanner crab obtained during a bottom trawl survey on the research vessel TINRO in the depth of 90–970 m in September and October 2012. The gastrointestinal tract was dissected and the food bolus of stomach and intestines was weighted, than the volumetric proportions of components were determined visually, the large fragments were weighted. The rate of occurrence of food objects, the prevalence rate and Froerman coefficient were also determined during analysis. Partial indices of stomach fullness were calculated as the percentage of each component in the food bolus. Partial indices of intestine fullness were not taken into consideration. The composition, distribution and quantitative characteristics of benthos in the areas of sampling were analyzed. An overall picture of the distribution of these crabs with indication of their maximum and average population density was submitted. It is noted that the basic food for golden king crab were the polychaete and brittle stars (33.2 and 32.1 % of the total mass respectively). The basic food for triangle tanner crab were the polychaete and molluscs (31.4 and 27.3 % respectively). The average fullness index was 15.5 and 20.9 ‱. It was concluded that both types of crabs are trophically associated with detrital network. Analysis of the data showed that food range of deep-sea crabs and offshore king crabs is determined by the composition of the benthic population in the habitat. It characterizes triangle tanner crab as the opportunistic omnivorous predator.

scholarly journals Varicella complications in children one-site Polish population – a 19- year long survey

2019 ◽  
pp. 459-467
Author(s):  
Beata Smok ◽  
Justyna Franczak ◽  
Krzysztof Domagalski ◽  
Małgorzata Pawłowska
Keyword(s):  
Gastrointestinal Tract ◽  
Survey Methods ◽  
Varicella Vaccine ◽  
Herd Immunity ◽  
Neurological Complications ◽  
National Immunization ◽  
The Mean ◽  
Tract Infections ◽  
Bacterial Skin Infections ◽  
Length Of Hospitalization

OBJECTIVES. The aim of this study was to describe the epidemiology of chickenpox complications in children, based on a 19-year long survey. METHODS. This publication constitutes a review of medical records of 761 patients under the age of 18 who were hospitalized at the T. Browicz Provincial Hospital for Infectious Diseases in Bydgoszcz, Poland from the 1st of January 1999 to the 31st of December 2017. RESULTS. Over the study period, 761 children diagnosed with varicella complications were hospitalized. The mean number of hospitalizations in each year amounted to 40. The median age of admitted patients was 4 years. The median length of hospitalization was 5 days (ranged from 1 to 30 days). The most frequent varicella complications included respiratory tract infections – 229/761 (30.1%), bacterial skin infections – 189/761 (24.8%) and gastrointestinal tract disorders – 142/761 (18.6%). Pneumonia, bronchitis and gastrointestinal tract disturbances, were reported most often in children under 2 years of age, while neurological complications occurred most frequently in children at 3-6 years of age. No significant differences in the number of varicella complications between immunocompromised and immunocompetent children were reported. CONCLUSIONS. Varicella complications mainly affect the youngest immunocompetent children. Population-wide vaccination and herd immunity appears to be the best way to reduce the incidence of chickenpox and the rate of varicella complications. This study gives support for inclusion of universal varicella vaccine in the National Immunization Program in Poland.

scholarly journals Influence of the summer deep-sea circulations on passive drifts among the submarine canyons in the northwestern Mediterranean Sea

Ocean Science ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 1745-1759 ◽  
Author(s):  
Morane Clavel-Henry ◽  
Jordi Solé ◽  
Miguel-Ángel Ahumada-Sempoal ◽  
Nixon Bahamon ◽  
Florence Briton ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Continental Slope ◽  
Deep Sea ◽  
Particle Transport ◽  
Bottom Topography ◽  
Regional Ocean Modeling System ◽  
Submarine Canyons ◽  
Northwestern Mediterranean Sea ◽  
The Impact ◽  
Northwestern Mediterranean

Abstract. Marine biophysical models can be used to explore the displacement of individuals in and between submarine canyons. Mostly, the studies focus on the shallow hydrodynamics in or around a single canyon. In the northwestern Mediterranean Sea, knowledge of the deep-sea circulation and its spatial variability in three contiguous submarine canyons is limited. We used a Lagrangian framework with three-dimensional velocity fields from two versions of the Regional Ocean Modeling System (ROMS) to study the deep-bottom connectivity between submarine canyons and to compare their influence on the particle transport. From a biological point of view, the particles represented eggs and larvae spawned by the deep-sea commercial shrimp Aristeus antennatus along the continental slope in summer. The passive particles mainly followed a southwest drift along the continental slope and drifted less than 200 km considering a pelagic larval duration (PLD) of 31 d. Two of the submarine canyons were connected by more than 27 % of particles if they were released at sea bottom depths above 600 m. The vertical advection of particles depended on the depth where particles were released and the circulation influenced by the morphology of each submarine canyon. Therefore, the impact of contiguous submarine canyons on particle transport should be studied on a case-by-case basis and not be generalized. Because the flows were strongly influenced by the bottom topography, the hydrodynamic model with finer bathymetric resolution data, a less smoothed bottom topography, and finer sigma-layer resolution near the bottom should give more accurate simulations of near-bottom passive drift. Those results propose that the physical model parameterization and discretization have to be considered for improving connectivity studies of deep-sea species.

scholarly journals Climate change and the future productivity and distribution of crab in the Bering Sea

2020 ◽  
Author(s):  
Cody Szuwalski ◽  
Wei Cheng ◽  
Robert Foy ◽  
Albert J Hermann ◽  
Anne Hollowed ◽  
...  
Keyword(s):  
Bering Sea ◽  
Ice Cover ◽  
The United States ◽  
The Arctic ◽  
Snow Crab ◽  
Red King Crab ◽  
Potential Productivity ◽  
Environmental Indices ◽  
King Crab ◽  
Tanner Crab

Abstract Crab populations in the eastern Bering Sea support some of the most valuable fisheries in the United States, but their future productivity and distribution are uncertain. We explore observed changes in the productivity and distribution for snow crab, Tanner crab, and Bristol Bay red king crab. We link historical indices of environmental variation and predator biomass with observed time series of centroids of abundance and extent of crab stock distribution; we also fit stock–recruit curves including environmental indices for each stock. We then project these relationships under forcing from global climate models to forecast potential productivity and distribution scenarios. Our results suggest that the productivity of snow crab is negatively related to the Arctic Oscillation (AO) and positively related to ice cover; Tanner crab’s productivity and distribution are negatively associated with cod biomass and sea surface temperature. Aspects of red king crab distribution and productivity appear to be related to bottom temperature, ice cover, the AO, and/or cod biomass. Projecting these relationships forward with available forecasts suggests that Tanner crab may become more productive and shift further offshore, red king crab distribution may contract and move north, and productivity may decrease for snow crab as the population contracts northward.

Initial Deep-Sea Sediment Deformation at the Base of the Washington Continental Slope: A Response to Subduction

Geology ◽  
1974 ◽  
Vol 2 (11) ◽  
pp. 561 ◽  
Author(s):  
Bobb Carson ◽  
Jennwei Yuan ◽  
Paul B. Myers ◽  
William D. Barnard
Keyword(s):  
Continental Slope ◽  
Deep Sea ◽  
Deep Sea Sediment ◽  
Sediment Deformation
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