scholarly journals Chemical risks associated with consumption of shellfish harvested on the north shore of the St. Lawrence River's lower estuary.

2004 ◽  
Vol 112 (8) ◽  
pp. 883-888 ◽  
Author(s):  
Fabien Gagnon ◽  
Thierry Tremblay ◽  
Justine Rouette ◽  
Jacques-François Cartier
Keyword(s):  
Lower Estuary ◽  
North Shore ◽  
The North

Ecology of Benthic Epifauna of the Estuary and Gulf of St. Lawrence: Factors Influencing Their Distribution and Abundance on Buoys

1980 ◽  
Vol 37 (6) ◽  
pp. 979-999 ◽  
Author(s):  
Pierre Fradette ◽  
Edwin Bourget
Keyword(s):  
Water Temperature ◽  
Mytilus Edulis ◽  
Abundant Species ◽  
Freshwater Species ◽  
Lower Estuary ◽  
Lawrence Estuary ◽  
North Shore ◽  
Hiatella Arctica ◽  
The North ◽  
Saguenay Fjord

The invertebrate fauna on 200 buoys moored in the Estuary and Gulf of St. Lawrence was sampled from May through December from 1975 to 1976. A total of 45 species (13 sessile, 32 motile) was collected. The distribution of the most abundant sessile species (Obelia longissima, Mytilus edulis, Hiatella arctica, Balanus crenatus, and Balanus balanoides) was studied in detail. Numbers of organisms and biomass decreased markedly on passing from the Gulf of St. Lawrence to the Lower Estuary and from the Lower Estuary to the Upper Estuary. Numbers of species showed stepwise diminution along with a stepwise increase in turbidity, while community densities decreased progressively with salinities. No sessile species and four motile species were observed in the riverine portion of the Estuary. In the upper portion of the Estuary, freshwater species were found along the south shore whereas euryhaline species were observed on the north shore. Water outflow from the Saguenay Fjord coincided with the limit of penetration or with discontinuities in the distribution of all sessile species within the Estuary. In the Upper Estuary, patches of M. edulis, B. crenatus, and the hydroids O. longissima and Clytia sp. were observed in regions of upwelling. Similarly, in the Gulf, O. longissima was very abundant on buoys near Mingan Islands where there is also an upwelling. The relatively high abundance of hydroids where conditions were generally unfavorable for settlement of sessile organisms was due to their capacity to colonize substrata from the budding of a few individuals. Mytilus edulis was the most abundant species elsewhere in the Gulf, except along the Lower North Shore. Low water temperature influencing larval development of M. edulis in this region best explains low community densities. Variations of growth indices (maximum lengths and mean weights per individual) for M. edulis were related to water temperature and to relative abundance of suspended organic matter in seawater.Key words: benthic epifauna, St. Lawrence Estuary, Gulf of St. Lawrence, ecological distribution, biomass, population density, Mytilus edulis, Balanus crenatus, B. balanoides, Hiatella arctica, Obelia longissima, buoys

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.

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.

Seismicity and faulting in the Charlevoix zone of the St. Lawrence Valley

1984 ◽  
Vol 74 (2) ◽  
pp. 595-603
Author(s):  
F. M. Anglin
Keyword(s):  
Active Zone ◽  
Continuous Monitoring ◽  
North Shore ◽  
The North ◽  
Earthquake Zone ◽  
St Lawrence River

Abstract Continuous monitoring of the seismically active Charlevoix zone since late 1977 has delineated the boundaries of the earthquake zone under the north shore and has enabled an association to be made with surface mapped faults that strike along the St. Lawrence Valley and dip to the southeast. Within the active zone, aseismic volumes are found under parts of the St. Lawrence River and another elongated zone of activity is found to the southeast on unmapped faults dipping under the river. The previous suggestions that the activity is related to old rift faults, which have been later weakened by a meteor impact, would seem to be upheld.

scholarly journals Mass mortality of Northern Map Turtles (Graptemys geographica)

2015 ◽  
Vol 129 (1) ◽  
pp. 80 ◽  
Author(s):  
Jordan Catrysse ◽  
Emily Slavik ◽  
Jonathan Choquette ◽  
Ashley E. Leifso ◽  
Christina M. Davy
Keyword(s):  
Lake Erie ◽  
Mass Mortality ◽  
Species At Risk ◽  
Long Term Effects ◽  
North Shore ◽  
The North ◽  
The Poor ◽  
Map Turtles ◽  
Graptemys Geographica

We report a mass mortality of Northern Map Turtles (Graptemys geographica [LeSueur, 1817]) on the north shore of Lake Erie, Ontario, Canada. Thirty-five dead adult females were recovered from a nesting area over a period of four weeks. Predation and boat strikes were both excluded as potential cause of death, but the actual cause could not be determined because of the poor condition of the carcasses. Other possible explanations for the mortality include poisoning, drowning, and infection with an unidentified pathogen. Mass mortality in long-lived species, such as turtles, can have long-term effects on population growth and is a cause for concern in a species at risk.

Acentropus niveus (Oliv.) (Lepidoptera: Pyralidae) on the north shore of Lake Erie with a consideration of its distribution in North America

1950 ◽  
Vol 82 (12) ◽  
pp. 250-252 ◽  
Author(s):  
W. W. Judd
Keyword(s):  
North America ◽  
Green Alga ◽  
Lake Erie ◽  
Filamentous Green Alga ◽  
North Shore ◽  
The North ◽  
Lepidoptera Pyralidae ◽  
Shallow Bay ◽  
The Village ◽  
The Waves

On July 12, 1950 a collection of adults of the moth Acentropus niveus (Oliv.) was made on the north shore of Lake Erie near the village of South Cayuga, Ontario (Maps A, B-3). At the southern limits of the townships of Dunn and South Cayuga (Haldimand County) a shallow bay extends for a distance of about two miles along the shore of the lake (Map A). Along this bay is a sandy or gravelly beach ten to twenty yards wide backed by a cliff of clay that rises abruptly above the beach. On the day the collections were made the sky was clear and a brisk southerly breeze was causing waves to wash on the beach. The action of the waves had deposited debris, consisting largely of tangled masses of a filamentous green alga and exuviae of the mayfly Hexagenia occulta, in a windrow six inches to two feet wide along the shore. The moths ere found in this debris, most of them lying dead and with bedraggled wings, while some lay on their backs with wings stuck to the damp surface and with legs kicking and a few were crawling about on the debris.

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