Steelhead Trout (Salmo gairdneri) on the North Shore of the Gulf of St. Lawrence, near Sept-Îles, Québec

1981 ◽  
Vol 38 (2) ◽  
pp. 245-246 ◽  
Author(s):  
Frederick G. Whoriskey jr. ◽  
Robert J. Naiman ◽  
Peter H. Heinermann
Keyword(s):  
Late Summer ◽  
Geographic Range ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Exotic Fish ◽  
Potential Threat ◽  
North Shore ◽  
The North ◽  
Large Numbers ◽  
Early Fall

Fourteen steelhead trout (Salmo gairdneri) were captured in the Matamek and Moisie rivers on the North Shore of the Gulf of St. Lawrence, near Sept-Îles, Québec, in the late summer and early fall of 1979. Steelhead trout are not indigenous to this area. The relatively large numbers of fish taken and their presence in these two rivers on the North Shore may indicate an expanding distribution and a potential threat of colonization in this area of pristine Atlantic salmon (Salmo salar) habitat.Key words: steelhead trout, Salmo gairdneri; geographic range, exotic fish

The Distribution and Migrations of Locusta in Europe

1940 ◽  
Vol 31 (3) ◽  
pp. 211-246 ◽  
Author(s):  
Z. V. Waloff
Keyword(s):  
Long Range ◽  
Late Summer ◽  
The Black Sea ◽  
Quiescent State ◽  
British Isles ◽  
The West ◽  
The North ◽  
Outbreak Area ◽  
Large Numbers ◽  
Outbreak Areas

1. From the study of the historical records of European invasions by Locusta from the 14th century to the present day, it is concluded that the subspecies concerned was L. m. migratoria originating in the West Pontian outbreak area. This area formerly comprised the lower courses of rivers draining into the Black Sea from the Danube to the Dniepr inclusive, and is now confined to the delta of the Danube. From here swarms migrated into central Europe and the eastern part of the north European plain. The northern part of the plain, the British Isles and Fenno-Scandia, lie on the outskirts of the invasion area, and as a rule were only reached by small detachments from swarms. The decline of the West Pontian outbreak centres was accompanied by the gradual decline of the area subject to invasions by large swarms, but during outbreaks small groups and separate individuals of ph. gregaria continue to reach the further limits of the invasion area.2. The distances covered within a single generation by swarms of L. m. migratoria in temperate Europe (up to 1,600 miles) were comparable in extent to those traversed by L. m. migratorioides in tropical Africa.3. Long-range migrations to the extreme limits of the invasion area are not confined to L. m. migratoria ph. gregaria but occur also in ph. solitaria. This is shown by the arrival of individuals of this phase in the British Isles during theperiod when the West Pontian outbreak areas are in a quiescent state. From this and from literature data on other locust species it is concluded that long-range migration is a regular seasonal phenomenon in swarming acrididae, independent of the presence of large numbers or the phase.4. The late summer immigration of L. m. migratoria into the British Isles may be a part of a more general east to west movement of flying insects which may occur in Europe at that season.5. It is probable that L. m. migratoria sometimes oviposit in the British Isles, for they may arrive in a mature state, or during exceptionally hot summers in southeastern England they may reach sexual maturity after arrival. The eggs, however, are apparently unable to survive winter conditions.

FACTORS INFLUENCING SEASONAL CHANGES IN THYROID ACTIVITY IN JUVENILE STEELHEAD TROUT, SALMO GAIRDNERI

1965 ◽  
Vol 43 (5) ◽  
pp. 719-729 ◽  
Author(s):  
J. G. Eales
Keyword(s):  
Body Weight ◽  
Seasonal Changes ◽  
Late Summer ◽  
Salmo Gairdneri ◽  
Thyroid Cell ◽  
Steelhead Trout ◽  
Thyroid Activity ◽  
Cell Height ◽  
Factors Influencing ◽  
Tall Cell

Seasonal changes in thyroid cell height and radioiodide indices of thyroid activity (CR and T/S) were measured in yearling and 2-year-old steelhead trout held in freshwater. Cell height was high in yearlings in mid-June and in 2-year-olds in late April and May at parr–smolt transformation; in both it was low in late summer and moderately high in winter. CR and T/S were high both at parr–smolt transformation and in late summer, but were low in winter. Only at parr–smolt transformation did cell height and radioiodide indices agree.Two-year-old potential smolts were held from January to May under four controlled temperature and photoperiod regimes. These experiments revealed that at parr–smolt transformation, both rising temperature and lengthening photoperiod induced the characteristically high CR and T/S values, but that the tall cell height depended on the lengthening photoperiod. Cell height and T/S were measured in yearlings (non-migrants) subjected to similar regimes at the same season. T/S was uninfluenced by photoperiod but responded to rising temperature. Cell height responses were more complex and indicated involvement of other variables.In September, small yearlings possessed significantly higher T/S and CR values than did large yearlings. A relationship between thyroid function and body weight could explain seasonal changes not attributable to temperature or photoperiod.

scholarly journals Study of Aerosols’ Characteristics and Dynamics over the Kingdom of Saudi Arabia Using a Multisensor Approach Combined with Ground Observations

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Ashraf Farahat ◽  
Hesham El-Askary ◽  
Abdulaziz Al-Shaibani
Keyword(s):  
Saudi Arabia ◽  
Late Summer ◽  
Pollution Levels ◽  
The North ◽  
Microphysical Properties ◽  
Deep Blue ◽  
Aerosol Distribution ◽  
Early Fall ◽  
Anthropogenic Contribution ◽  
Dust Events

This study covers various aspects of the aerosol distribution and characteristics, namely, optical depth climatology, absorption characteristics, and their microphysical properties over four regions in Saudi Arabia using satellite and ground observations including MODIS/Terra and Aqua, OMI, MISR/Terra, AERONET, and CALIPSO for the period April 2003–January 2013. The study includes cities in the North Western, Western, Eastern provinces of Saudi Arabia and in the Rub al Khali desert or Empty Quarter. Satellite and ground observations showed that the dust season extends from April to August with prominent peaks yet with high anthropogenic contribution late summer and early fall. Analysis shows an increase in the aerosol concentration during March 2009 which could be attributed to a major dust storm during that time. Comparing the AOD time series over regions 1–3 and region 4 (desert) we observe monthly and annual variability with no recurrence pattern over the years. The Aqua Deep Blue AOD550data shows a single peak pattern that occurs over region 4 during the spring season known for its frequent dust events. OMI data shed the light on the presence of higher air pollution levels over region 3, representing the oil rich eastern province of Saudi Arabia.

A PROPOSED METHOD FOR MARKING MIGRANT BUTTERFLIES

1941 ◽  
Vol 73 (2) ◽  
pp. 21-22 ◽  
Author(s):  
F. A. Urquhart
Keyword(s):  
Danaus Plexippus ◽  
Late Summer ◽  
Lake Ontario ◽  
Monarch Butterfly ◽  
Species Trees ◽  
Monarch Butterflies ◽  
Royal Ontario Museum ◽  
North Shore ◽  
The North

In the late summer of 1940, there was a decided peak in the abundance of the monarch butterfly, Danaus plexippus L. Numerous reports were received by the Royal Ontario Museum of Zoology, and a personal investigation proved the abundance of the species; trees bordering the north shore of Lake Ontario in the vicinity of Toronto were literally covered with monarch butterflies.

On Riccia marginata and related species (Ricciaceae, Marchantiophyta)

2012 ◽  
Vol 46 ◽  
pp. 298-305 ◽  
Author(s):  
A. D. Potemkin ◽  
T. Ahti
Keyword(s):  
Related Species ◽  
Lake Ladoga ◽  
Leningrad Region ◽  
Sem Images ◽  
North Shore ◽  
The North ◽  
Molecular Studies ◽  
The Future ◽  
The Town

Riccia marginata Lindb. was described by S. O. Lindberg (1877) from the outskirts of the town of Sortavala near the north shore of Lake Ladoga, Republic of Karelia, Russia. The species has been forgotten in most recent liverwort accounts of Europe, including Russia. Lectotypification of R. marginata is provided. R. marginata shares most characters with R. beyrichiana Hampe ex Lehm. It differs from “typical” plants of R. beyrichiana in having smaller spores, with ± distinctly finely areolate to roughly papillose proximal surfaces and a narrower and shorter thallus, as well as in scarcity or absence of marginal hairs. It may represent continental populations of the suboceanic-submediterranean R. beyrichiana, known in Russia from the Leningrad Region and Karelia only. The variability of spore surfaces in R. beyrichiana is discussed and illustrated by SEM images. A comparison with the spores of R. bifurca Hoffm. is provided. The question how distinct R. marginata is from R. beyrichiana needs to be clarified by molecular studies in the future, when adequate material is available. R. marginata is for the time being, provisionally, included in R. beyrichiana.

Rhineland on the Way to its Thousandth Anniversary or Water-Administration in the Next 100–200 Years

1991 ◽  
Vol 23 (1-3) ◽  
pp. 49-55
Author(s):  
E. H. baron van Tuyll van Serooskerken
Keyword(s):  
The Netherlands ◽  
Late Summer ◽  
Water Shortage ◽  
Land Utilization ◽  
Water Control ◽  
Coastal Defence ◽  
The North ◽  
Policies And Measures ◽  
Water Provision ◽  
Water Administration

An inventory is made of the effects of sea level rise and expected climatic change on the level of the district water authorities in the Netherlands and especially the “hoogheemraadschap” of Rhineland in the next 100-200 years. Special attention is paid to the effects on land utilization, coastal defence and water control. The first is hard to describe by lack of research, the second can already be determined in terms of cost; the third can be described in its effects on brackishness and water provision with indication of policies and measures to be taken. Preliminary conclusions are that larger efforts on coastal defence - even with present techniques - will be a realistic answer in terms of cost. The foreseen increase of brackishness in area and salt concentration, will give a significant extra need for fresh water. High cost and even higher risks have to be expected with regard to measures to neutralize the effects of a water surplus in winter and a growing water shortage in (late) summer, while the cost will further grow. Because of the effect a larger area must be drained off and water has to be raised higher as the Netherlands will sink in relation to the North Sea.

Conflict, Population Movement, and Microscale Social Networks in Northern Iroquoian Archaeology

2021 ◽  
Vol 86 (2) ◽  
pp. 350-367
Author(s):  
Jennifer Birch ◽  
John P. Hart
Keyword(s):  
Social Networks ◽  
Sixteenth Century ◽  
Lake Ontario ◽  
Population Movement ◽  
Network Ties ◽  
The West ◽  
Local Networks ◽  
North Shore ◽  
The North ◽  
Specific Sequences

We employ social network analysis of collar decoration on Iroquoian vessels to conduct a multiscalar analysis of signaling practices among ancestral Huron-Wendat communities on the north shore of Lake Ontario. Our analysis focuses on the microscale of the West Duffins Creek community relocation sequence as well as the mesoscale, incorporating several populations to the west. The data demonstrate that network ties were stronger among populations in adjacent drainages as opposed to within drainage-specific sequences, providing evidence for west-to-east population movement, especially as conflict between Wendat and Haudenosaunee populations escalated in the sixteenth century. These results suggest that although coalescence may have initially involved the incorporation of peoples from microscale (local) networks, populations originating among wider mesoscale (subregional) networks contributed to later coalescent communities. These findings challenge previous models of village relocation and settlement aggregation that oversimplified these processes.

Sign in / Sign up

Export Citation Format

Share Document