The natural environment of the Québec City region during the Holocene

2009 ◽  
Vol 43 (1) ◽  
pp. 13-29 ◽  
Author(s):  
Louise Filion ◽  
Martin Lavoie ◽  
Lydia Querrec
1989 ◽  
Vol 69 (1) ◽  
pp. 171-183 ◽  
Author(s):  
ANNE LÉGÈRE ◽  
JEAN-MARC DESCHÊNES

The effects of time of emergence and plant density on hemp-nettle growth (Galeopsis tetrahit) were measured in natural field populations from the Québec City region and in a greenhouse experiment. In the field, more than 80% of the plants emerged during a peak period of about 2 wk in early May. Few hemp-nettle plants emerged after this peak period. Late-emerging plants produced relatively little biomass compared to plants that had emerged during the early emergence flush. Total biomass accumulation increased with density on three out of four sites. Stands from the lowest density (80 plants m−2) generally produced less biomass than stands of higher plant densities. Average plant biomass production decreased with increasing density. Plants from low density stands displayed a bushy profile compared to the etiolated, single-stemmed plants from high density stands. Mature hemp-nettle stands did not develop strong hierarchical population structures such as found for other annual broadleaf species. Hemp-nettle plants within a stand were distributed rather evenly over a number of height classes. A large proportion of the total biomass was produced by a relatively considerable number of plants 45–59 cm in height rather than by a few dominating individuals.Key words: Hemp-nettle, Galeopsis tetrahit, weed populations, emergence pattern, population density, population structure


2020 ◽  
Vol 8 (7) ◽  
pp. 128-140
Author(s):  
Silpa Krishnan V S ◽  
Priyanka Tresa Paul

Since the onset of industrialization around the year 1800, along with its growing dependence on fossil fuels, have moved us from the Holocene era and into what is now being called the Anthropocene era. Much of the meaning attributed to the human- nature interaction is anthropocentric and this has resulted in causing a disturbing dialogue between nature and man. Many authors have tried to reform anthropocentric signs into the nature-centric sign to convey environmentalist themes and signify the natural environment as independent, culturally complex, and worthy of humanity’s respect. The paper aims to elaborate on the applicability of eco semiotics in literary analysis, especially in regards to fantasy and fictional literature. With the help of Antoine de Saint-Exupéry’s The Little Prince, Rudyard Kipling’s The Jungle Book, the 2016 animation film Moana, and the 2009 sci-fi film Avatar, this paper will examine the literature concerning eco semiotics(natural symbols and their interpretation across cultural-ecological boundaries) in an effort to provide an alternative to the positivist approach inherent in much contemporary environmental thought that has contributed to the present environmental crisis (Verhagen, 2008).


1994 ◽  
Vol 5 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Theresa W Gyorkos ◽  
Evelyne Kokoskin-Nelson ◽  
J Dick MacLean ◽  
Julio C Soto

Objectives: To determine if there was parasite contamination in the sand and soil in daycare sandboxes and play areas, with the goal of developing practice guidelines for their management.Methods: One hundred samples of sand and soil from 10 daycare centres in different regions of the province of Quebec, collected between April 22 and May 6, 1991, were examined.Results: Toxocara eggs were found in both surface and subsurface sand from two Montreal centres and co-occurred withAscarisspecies (surface sand) in one centre and with hookworm (surface soil) in the second. Hookworm eggs were also recovered from one centre in the Quebec City region.Conclusions: These results document the presence of potentially pathogenic helminth parasites in the daycare environment. Evidence from the literature regarding the health risk to children is insufficient and highlights the need for further research into the assessment of the risk of human infection and morbidity, the viability of these parasites under different environmental conditions and practical issues related to the management of sand and soil.


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