A global paleoclimate observing system.
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Animals↗
Biomedical subjects
I Larocque
Publications and source records attributed to I Larocque.
Modern pollen-representation of some boreal species on islands in a large lake in Canada.
Studies of pollen source areas of closed-canopy sites are contradictory. Some authors found that closed-canopy sites mainly collect local pollen while others found more distant sources. This dichotomy might stem from the use of canopies of varying degrees of closure, and from variations in the pollen productivity of the local vegetation and the background pollen rain. Here, 30 islands were used to evaluate the pollen sources of closed-canopy sites. We compared pollen with the forest inventory in three quadrat sizes: 100, 400m(2) and on the whole island. Regression analyses showed that most pollen of Picea spp., Pinus spp., and Betula spp. comes from within the 400m(2) quadrat. Abies balsamea and Thuja occidentalis showed no relationship with vegetation in any of the quadrats considered, suggesting a more regional source. Insularity and island size are important factors influencing the pollen source area; correlations were stronger on islands located 120050ha. These results suggest that closed-canopy sites on islands may be useful in stand-level vegetation history reconstruction through pollen analysis, but that caution must be exercised in separating the local and regional signals.
Journal Article↗
Nutritive and nonnutritive sucking habits: a review.
The habit of sucking is the first coordinated muscular activity of the infant. There are essentially two forms of sucking: the nutritive form which provides essential nutrients, while non-nutritive sucking insures a feeling of warmth and a sense of security. This review gives a description of the anatomy and physiology of sucking together with the influence of breastfeeding and bottle-feeding (conventional or orthodontic nipples) on the dentofacial structures of the infant. Factors involved in the choice of feeding are also discussed. Children who do not have access to unrestricted breastfeeding or bottle-fed children may satisfy their instinctive sucking urge with a pacifier. This paper presents the different types of pacifiers (conventional or orthodontic) along with the beneficial effects provided by pacifiers. Detrimental effects caused by incorrect use of pacifiers or digit-sucking habits are also summarized. Health professionals should inform expectant mothers about the dentofacial advantages of breastfeeding.
Bottle Feeding↗