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An Estimator for the Size of an Animal Population
Biometrika, 1973SUMMARY A method of estimating animal populations which is popular among zoologists is to take the total of the ages of animals that die during a given year as an estimator of population size. In this note the bias and variance of the estimator are investigated for a stationary model, and for one based on a branching process.
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2013
A number of common themes run throughout this volume. First, one begins to appreciate just how much variation there is in body size among most groups of animals. For the most part, a clade is not a homogenous collection of similar bauplans. Even among volant taxa, such as birds and bats, substantial variation in body mass exists despite the ...
Felisa A. Smith, S. Kathleen Lyons
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A number of common themes run throughout this volume. First, one begins to appreciate just how much variation there is in body size among most groups of animals. For the most part, a clade is not a homogenous collection of similar bauplans. Even among volant taxa, such as birds and bats, substantial variation in body mass exists despite the ...
Felisa A. Smith, S. Kathleen Lyons
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BODY SIZE AND NUMBERS OF PLANTS AND ANIMALS
Evolution, 1973Although it is one of the most important attributes of organisms, body size has received surprisingly little attention in biology. (Some exceptions, with literature entries, are Bonner, 1968; Gould, 1966, 1968; Haldane, 1928; Hutchinson, 1971; Kurten, 1963; McNab, 1971; Nicol, 1964; Rensch, 1960; Schoener, 1970.) Even when it is discussed, there is ...
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Ecological Modelling, 1979
Abstract A modification is made in Holgate's model for the growth of elephant herds by assuming the probability of combination of two herds to be proportional to the number of chance meetings of herds. The stationary distribution of herd numbers is considered, and its asymptotic normality is obtained.
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Abstract A modification is made in Holgate's model for the growth of elephant herds by assuming the probability of combination of two herds to be proportional to the number of chance meetings of herds. The stationary distribution of herd numbers is considered, and its asymptotic normality is obtained.
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Optimal body size and an animal's diet
Acta Biotheoretica, 1979Within many animal taxa there is a trend for the species of larger body size to eat food of lower caloric value. For example, most large extant lizards are herbivorous. Reasonable arguments based on energetic considerations are often invoked to explain this trend, yet, while these factors set limits to feasible body size, they do not in themselves ...
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The Physics Teacher, 2020
Newton’s law of cooling describes an object whose temperature decreases exponentially with time. Because of its many applications, it is a frequent topic of introductory physics labs. In this article, I describe an experiment designed for the freshman year algebra-based physics course that applies this law to answering the question, “Why don’t small ...
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Newton’s law of cooling describes an object whose temperature decreases exponentially with time. Because of its many applications, it is a frequent topic of introductory physics labs. In this article, I describe an experiment designed for the freshman year algebra-based physics course that applies this law to answering the question, “Why don’t small ...
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Science Signaling, 2008
Classical experiments with amphibians revealed that bisected embryos develop into properly proportioned tadpoles and that transplantation of a small group of dorsal cells called "Spemann’s organizer" into the ventral side of an early embryo leads to the formation of a properly proportioned second axis.
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Classical experiments with amphibians revealed that bisected embryos develop into properly proportioned tadpoles and that transplantation of a small group of dorsal cells called "Spemann’s organizer" into the ventral side of an early embryo leads to the formation of a properly proportioned second axis.
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Optimum Sample Size in Animal Disease Control
Biometrics, 1961The objective of an animal disease control program would either be (a) to completely eradicate a disease or alternatively (b) to reduce the incidence of a disease to a low level and then to keep it in check. In the case of (b) the causative organism might not be completely stamped out.
Nordskog, A. W. +2 more
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Evidence for a size-sensing mechanism in animal cells
Nature Cell Biology, 2004Continuously proliferating cells exactly double their mass during each cell cycle. Here we have addressed the controversial question of if and how cell size is sensed and regulated. We used erythroblasts that proliferate under the control of a constitutively active oncogene (v-ErbB) or under the control of physiological cytokines (stem cell factor ...
Helmut, Dolznig +4 more
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Suturable gastrointestinal cannulas for animals of various sizes
Journal of Applied Physiology, 1975A new procedure in which gastrointestinal cannulas are prepared from suturable material improves in vovo methods and requires little machining. Substitution of a suturable material for rigid collars, previously used, prevents leakage, infection, and loss of the cannulas into the gut lumen.
C F, Cramer, R, Couch
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