The Distribution of Chaetognatha in the Gulf of Alaska in 1954 and 1956

1959 ◽  
Vol 16 (3) ◽  
pp. 351-361 ◽  
Author(s):  
Paul N. Sund
Keyword(s):  
Coastal Region ◽  
Gulf Of Alaska ◽  
Inland Waters ◽  
San Juan ◽  
Frequency Of Occurrence ◽  
Subarctic Region ◽  
Saline Waters ◽  
Hydrographic Features

Zooplankton collections from two cruises to the Gulf of Alaska during 1954 and 1956 were studied to determine the species of Chaetognatha present, to establish their distribution within those waters, and to consider the distribution of the species with regard to certain general hydrographic features prevalent in the region at the time the collections were made. Also considered were a few collections made during the summer of 1958 in the waters surrounding San Juan Island in the San Juan Archipelago, Washington.The general oceanographic features of the Gulf of Alaska are described. The distributions and frequency of occurrence of 3 species of 2 genera of chaetognatha are described and discussed. Eukrohnia hamata is found at most off-shore stations, diminishing in number nearer the coast in less saline waters. Sagitta elegans is apparently cosmopolitan in the areas studied. S. lyra an oceanic form, was found in regions influenced by waters of the Subarctic Region and the American Coastal Region. The presence of S. lyra in inland waters of the San Juan Archipelago during the summer of 1958 is considered to be an indication of the shoreward movement of oceanic waters.

Harbor porpoise (Phocoena phocoena) recovery in the inland waters of Washington: estimates of density and abundance from aerial surveys, 2013–2015

2016 ◽  
Vol 94 (7) ◽  
pp. 505-515 ◽  
Author(s):  
Thomas A. Jefferson ◽  
Mari A. Smultea ◽  
Sarah S. Courbis ◽  
Gregory S. Campbell
Keyword(s):  
Puget Sound ◽  
Distance Sampling ◽  
Line Transect ◽  
Inland Waters ◽  
San Juan ◽  
Phocoena Phocoena ◽  
Harbor Porpoise ◽  
San Juan Islands ◽  
Juan De Fuca ◽  
Harbor Porpoises

The harbor porpoise (Phocoena phocoena (L., 1758)) used to be common in Puget Sound, Washington, but virtually disappeared from these waters by the 1970s. We conducted systematic aerial line-transect surveys (17 237 km total effort) for harbor porpoises, with the goal of estimating density and abundance in the inland waters of Washington State. Surveys in Puget Sound occurred throughout the year from 2013 to 2015, and in the Strait of Juan de Fuca and the San Juan Islands (and some adjacent Canadian waters) in April 2015. We used a high-wing, twin-engine Partenavia airplane and four observers (one on each side of the plane, one looking through a belly port, and one recording data). A total of 1063 harbor porpoise groups were sighted. Density and abundance were estimated using conventional distance sampling methods. Analyses were limited to 447 harbor porpoise groups observed during 5708 km of effort during good sighting conditions suitable for line-transect analysis. Harbor porpoises occurred in all regions of the study area, with highest densities around the San Juan Islands and in northern Puget Sound. Overall, estimated abundance for the Washington Inland Waters stock was 11 233 porpoises (CV = 37%, 95% CI = 9 616 – 13 120). This project clearly demonstrated that harbor porpoises have reoccupied waters of Puget Sound and are present there in all seasons. However, the specific reasons for their initial decline and subsequent recovery remain uncertain.

Heat, salt and tracer transport in the Plymouth Sound coastal region: a 3-D modelling study

2003 ◽  
Vol 83 (4) ◽  
pp. 673-682 ◽  
Author(s):  
J.R. Siddorn ◽  
J.I. Allen ◽  
R.J. Uncles
Keyword(s):  
Hydrodynamic Model ◽  
Flow Characteristics ◽  
Coastal Region ◽  
English Channel ◽  
Tracer Transport ◽  
General Flow ◽  
South West ◽  
Hydrographic Features ◽  
Pollution Events ◽  
Modelling Study

A 3-D hydrodynamic model of the circulation, salinity and temperature within the embayment of Plymouth Sound, UK and its surrounding English Channel waters has been implemented. Thorough validation of the model shows that the main hydrographic features of the region, as characterized by these variables, are reproduced. The general flow characteristics, and the resultant distribution of freshwater from the main riverine source (the River Tamar), are described. The potential fate of contaminant releases within Plymouth Sound is investigated. Whitsand Bay, located south-west of Plymouth Sound, is shown to be a likely recipient for a proportion of these contaminants, irrespective of where in the Sound the release occurs, and as such is considered to be vulnerable to pollution events originating there.

Aspects of the chemical variability of some Tasmanian inland waters

1976 ◽  
Vol 27 (3) ◽  
pp. 351 ◽  
Author(s):  
RT Buckney
Keyword(s):  
Total Concentration ◽  
Inland Waters ◽  
Morphometric Characters ◽  
Fresh Waters ◽  
Ionic Concentrations ◽  
Geological Conditions ◽  
Chemical Variability ◽  
Saline Waters ◽  
The Mean ◽  
Standard Deviations

Variability of total concentration and of ionic concentrations (measured as the standard deviations) is proportional to a power of the mean concentrations in 25 Tasmanian waters. Stoichiometric variability is low in saline waters and can be high in fresh waters. Climate is recognized as being of primary importance in affecting variability, although morphometric characters exert an influence. Geological conditions are an important factor in determining stoichiometric variability.

Chemistry of salt lakes and other water of the sub-humid regions of Tasmania

1976 ◽  
Vol 27 (3) ◽  
pp. 359 ◽  
Author(s):  
RT Buckney ◽  
PA Tyler
Keyword(s):  
Surface Waters ◽  
Alkaline Earth ◽  
Ionic Composition ◽  
Salt Lakes ◽  
Salinity Range ◽  
Inland Waters ◽  
Chemical Parameters ◽  
Salt Pans ◽  
Saline Waters ◽  
Major Chemical

Analyses are presented of major chemical features of pans and lagoons in the sub-humid regions of Tasmania. The waters sampled are classed as fresh or saline, using a criterion which is a function of relative ionic composition. Saline waters are regarded as having ionic composition limited by the solubility of alkaline earth carbonates, and they have a composition akin to that of seawater. The fauna of salt pans is briefly mentioned. These analyses complete a survey of Tasmanian surface waters, and some relationships between ionic concentrations and other chemical parameters are reassessed for the entire salinity range (<10 ppm to > 200‰) of Tasmanian inland waters.

Halotolerant Copepoda in South American inland saline waters

Crustaceana ◽  
2018 ◽  
Vol 91 (5) ◽  
pp. 527-535 ◽  
Author(s):  
Patricio De los Ríos ◽  
Ian A. E. Bayly
Keyword(s):  
Literature Review ◽  
Shallow Lakes ◽  
Copepod Species ◽  
Salinity Range ◽  
Inland Waters ◽  
South American ◽  
The South ◽  
Saline Waters ◽  
Shallow Ponds

Abstract The zooplankton in South American saline waters is mainly dominated by copepods at salinities lower than 90 g/l, whereas at salinities above 90 g/l Artemia sp. is totally dominant. The aim of the present study is to analyse the salinity range of halophilic copepods on the basis of a literature review for South American saline inland waters. The calanoid Boeckella poopoensis Marsh, 1906, is widespread on the South American Altiplano and southern Argentinian plains, and in southern Patagonian shallow ponds. In the upper part of the salinity range, 20-90 g/l, B. poopoensis is the only copepod in the zooplankton of southern Patagonian and Altiplano shallow lakes. In the salinity range 5-20 g/l B. poopoensis may co-exist with B. palustris (Harding, 1955), two cyclopoids and an harpacticoid, and at salinities lower than 5 g/l it may co-exist with an even wider range of copepod species. Ecological and biogeographical aspects are also discussed.

scholarly journals The Occurrence of Marine Alga Enteromorpha Intestinalis in Water Courses from Salt Area Meledic Plateau, Vrancei Subcarpathians (Romania)

2015 ◽  
Vol 42 (1) ◽  
pp. 87-96
Author(s):  
Daniela Strat
Keyword(s):  
Marine Alga ◽  
Drainage Basin ◽  
Marine Species ◽  
Inland Waters ◽  
Enteromorpha Intestinalis ◽  
Essential Information ◽  
Black Sea Coast ◽  
Saline Waters ◽  
Water Courses ◽  
Sea Coast

AbstractThree new sites of Enteromorpha intestinalis have been found in the drainage basin of the Slănic River located in the Subcarpathians region, salt Meledic Plateau. E. intestinalis is a cosmopolitan macro green alga species with tubular thali that is primarily found in the coastal zone, including the Romanian Black Sea coast. Due to its salt tolerance this alga it was found in some inland waters, both fresh and saline waters courses and limnic waters that are often positively correlated with cultural eutrophication. These new reported localities of E. intestinalis in inland waters from this saline region contribute new and essential information about the distribution of this originally marine species on the inland area of Romania.

Distribution of population-based indicators across multiple taxa to assess the status of Gulf of Alaska and Bering Sea groundfish communities

2005 ◽  
Vol 62 (3) ◽  
pp. 344-352 ◽  
Author(s):  
Franz J. Mueter ◽  
Bernard A. Megrey
Keyword(s):  
Bering Sea ◽  
Gulf Of Alaska ◽  
Population Based ◽  
Fishing Effort ◽  
Frequency Of Occurrence ◽  
Catch Per Unit Effort ◽  
Eastern Bering Sea ◽  
Trawl Fishing ◽  
The Status ◽  
Commercial Species

Abstract Ecosystem-based approaches to fisheries management require researchers and managers to take into account effects of fishing on other components of the ecosystem, including non-commercial species. Currently, stock assessments in the Northeast Pacific are limited to the most important commercial species, little being known about the status of non-commercial species. Nevertheless, standardized bottom-trawl surveys conducted in the eastern Bering Sea (EBS) and Gulf of Alaska (GoA), although primarily designed to assess commercial species, provide valuable information on the abundance, distribution, and mean weight of numerous taxa. Using a novel statistical approach and survey data for the years 1993–2003, we examined trends in catch per unit effort (cpue), frequency of occurrence, and mean weight of individuals for each taxon. Time trends were computed as the slope of a linear regression of each indicator on year, and were summarized separately for the eastern and western GoA and for the EBS. Within each system, trends were further compared between commercial and non-commercial taxa. Simulations were used to obtain reference distributions for the expected distribution of slopes across many dependent populations. Observed distributions of trends were compared with simulated distributions, suggesting that more taxa than expected showed a decreasing trend in cpue in the EBS, but not in the GoA. These trends likely resulted from low groundfish productivity in the EBS during the 1990s. At the same time, the frequency of occurrence of significantly more taxa than expected increased in the EBS and, to a lesser extent, in the western GoA. Increases in frequency of occurrence were much more common among non-commercial, invertebrate taxa, and may be a response to reductions in trawl fishing effort during the 1990s.

Diversity of the genus Daphniopsis in the saline waters of Australia

2000 ◽  
Vol 78 (5) ◽  
pp. 794-808 ◽  
Author(s):  
Paul DN Hebert ◽  
Christopher C Wilson
Keyword(s):  
Reproductive Biology ◽  
Western Australia ◽  
Saline Lakes ◽  
Inland Waters ◽  
Allozyme Analysis ◽  
Asexual Population ◽  
Cyclic Parthenogenesis ◽  
Saline Waters ◽  
Group D

Although members of the cladoceran genus Daphniopsis form a dominant element of the fauna in the saline inland waters of Australia, their taxonomy has been in flux. In this study allozyme analysis was employed to examine the diversity, distributions, and reproductive biology of species in this genus. The results establish that D. pusilla, a species formerly thought to be widespread, is restricted to Western Australia, while a newly described species, D. truncata, which shares the attribute of producing a one-egged ephippium, is broadly distributed. The results of this study verify the taxonomic validity of the three recognized species of Daphniopsis, which produce two-egged ephippia, but another member of this group, D. wardi, is described from Western Australia. All populations were found to reproduce by cyclic parthenogenesis, except for one obligately asexual population of D. pusilla × D. truncata hybrids. No other case of hybridization was detected, although two species co-occurred in 15% of habitats. The six species of Daphniopsis now known from Australia appear to represent another example of an endemic radiation in the saline lakes of this continent.

scholarly journals Zooplankton Community Structure in Shallow Saline Steppe Inland Waters

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1164
Author(s):  
Katalin Zsuga ◽  
Zarina Inelova ◽  
Emil Boros
Keyword(s):  
Community Structure ◽  
Large Scale ◽  
Zooplankton Community ◽  
Extreme Environment ◽  
Baseline Survey ◽  
Inland Waters ◽  
High Concentration ◽  
Regional Study ◽  
Zooplankton Community Structure ◽  
Saline Waters

Several shallow saline waters can be found in Central Asia in arid steppe climate, but our knowledge of their zooplankton community has been so far rather limited. The aim of our research was to provide data on the steppe zooplankton community in a large-scale regional study. Therefore, a baseline survey was carried out in 23 shallow inland waters of different salinity in Northern Kazakhstan. We measured the quantity and identified the taxonomic composition of zooplankton in the spring period and examined changes in community structure in correlation with salinity. Lesser salt concentration of the hyposaline–mesosaline waters was indicated by the presence of halophilic rotifer species: Brachionus asplanchnoides, Br. dimidiatus, Br. plicatilis. Mesosaline and hypersaline waters were indicated by the presence of halobiont crustaceans: Moina salina, Arctodiaptomus salinus, Cletocamptus retrogressus. Very high concentration of salt was indicated by presence of Artemia alone which is the only group, that can tolerate and adapt to this extreme environment. In the hypersaline waterbodies at over 79 gL−1 high TDS conditions a very simple tropical structure was found. Artemia playing monopolistic ecological function in the zooplankton community. We identified three characteristic groups of shallow inland saline waters based on their zooplankton composition.

scholarly journals Storm surge prediction and frequency analysis for Andhra coast of India

MAUSAM ◽  
2021 ◽  
Vol 48 (4) ◽  
pp. 555-566
Author(s):  
Y.R. RAO ◽  
P. CHITTIBABU ◽  
S. K. DUBE ◽  
A. D. RAO ◽  
P. C. SINHA
Keyword(s):  
Andhra Pradesh ◽  
East Coast ◽  
Coastal Region ◽  
Storm Surges ◽  
Coastal Flooding ◽  
Frequency Of Occurrence ◽  
The Past ◽  
Inland Inundation ◽  
Cyclonic Storms ◽  
Made In

 Storm surges associated with severe cyclonic storms are common occurrences along the east coast of India. The coastal districts of Andhra Pradesh have experienced major surges in the past. Storm surges and the rains associated with cyclones are major causes for coastal flooding in this region. An attempt has been made, in this paper, to simulate surges along the Andhra coast that would have occurred due to severe cyclones during 1891-1996. Inland inundation due to surges is also estimated by using an empirical formula. The computed results are validated with the available observations. The comparison using post-storm survey reports, appears reasonably good to assert that the model is capable of predicting the peak surge amplitude and its location. Frequency of occurrence relationships is obtained for various zones along the coastal region for the purpose of risk analysis.      

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