Results 121 to 130 of about 140,256 (159)
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American Journal of Primatology, 2006
AbstractExplanations for the chemosensory abilities of newborn mammals focus primarily on food (milk) acquisition and communication (e.g., maternal–infant bonding). However, the relative importance of the main and accessory (vomeronasal) olfactory systems is hypothesized to differ at birth between altricial and precocial mammals. Strepsirrhines (lemurs
Timothy D, Smith +6 more
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AbstractExplanations for the chemosensory abilities of newborn mammals focus primarily on food (milk) acquisition and communication (e.g., maternal–infant bonding). However, the relative importance of the main and accessory (vomeronasal) olfactory systems is hypothesized to differ at birth between altricial and precocial mammals. Strepsirrhines (lemurs
Timothy D, Smith +6 more
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2001
Age and size at maturity have been an object of interest to humans since the domestication of animals and plants, for one of the objectives of domestication was to produce an organism that grew fast and matured early at a large size. Selection was also practiced to produce animals that could be used for such purposes as hunting and portaging, and to ...
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Age and size at maturity have been an object of interest to humans since the domestication of animals and plants, for one of the objectives of domestication was to produce an organism that grew fast and matured early at a large size. Selection was also practiced to produce animals that could be used for such purposes as hunting and portaging, and to ...
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Estimating the size at maturity in field populations of Daphnia (Cladocera)
Freshwater Biology, 1993SUMMARY Two methods for estimating the average body size at the onset of reproduction were applied to populations of Daphnia hyalina. The first, ‘average maturation size’, assesses maturity by the relative length of abdominal processes of Daphnia; the second, ‘size at first reproduction’ (SFR), calculates the size class in which 50% of the maximum ...
Stibor, H., Lampert, W.
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1998
Abstract This chapter analyses the evolution of age and size at maturity. Maturation divides a life into preparation and fulfilment. Age at maturity is pivotal, for fitness is often more sensitive to changes in this trait than tq changes in any other. With maturation, selection pressures and trade¬ offs change dramatically.
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Abstract This chapter analyses the evolution of age and size at maturity. Maturation divides a life into preparation and fulfilment. Age at maturity is pivotal, for fitness is often more sensitive to changes in this trait than tq changes in any other. With maturation, selection pressures and trade¬ offs change dramatically.
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The relationship between size and maturation in vitro in the unstimulated human oocyte
Fertility and Sterility, 1995To determine if the size of human oocytes at collection from unstimulated ovaries is related to their ability to resume meiosis and undergo maturation in vitro.A comparative study of oocyte diameter at collection.Department of Obstetrics and Gynecology, Northwestern University Medical School.Women age 25 to 39 years of age undergoing gynecological ...
K L, Durinzi +2 more
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Age and size at maturity in Indonesian women: A norm of reaction?
American Journal of Human Biology, 2014ObjectivesWe test (McIntyre and Kacerosky's [2011]: Am J Hum Biol 23:305–312) prediction that the relationship between age at menarche and height switches from negative to positive, in a unidirectional and smooth manner, as the society industrializes.
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Time Constraints Decouple Age and Size at Maturity and Physiological Traits
The American Naturalist, 2004Life-history theory predicts changes in age and size at maturity in response to constraints in animals with complex life cycles. A critical underlying assumption is that only these traits are optimized during ontogeny. However, it is not clear how altered life histories mechanistically translate into survival and fecundity.
Jens, Rolff +2 more
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A New Look at Relationships between Size at Maturity and Asymptotic Size
The American Naturalist, 1998Comparative studies have revealed positive correlations between size at maturity and asymptotic size in several taxa with asymptotic growth after maturity. Using a simple growth model, we show that positive correlations between size at maturity and asymptotic size are predicted for different individuals in the same species if growth costs of ...
J A, Stamps, M, Mangel, J A, Phillips
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Secular Changes in Size and Maturity: Causes and Effects
Monographs of the Society for Research in Child Development, 1979Secular changes in body size, proportions and composition, in maturation rates during childhood and adolescence, and in adult size have been considered in the preceding chapters. This chapter addresses possible causes and effects of the secular trend evident over about the past 150 years.
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Body Size and Maturation in Mexico
1984In Mexico, as in all underdeveloped countries, children and adults are smaller than those living in highly industrialized countries. This difference has been mainly attributed to less favourable living conditions prevailing in the former, although differences in the genetic constitution of populations have also been considered.
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