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Encyclopedia > Age class structure

Age class structure, in fisheries and wildlife management, is a part of population assessment. Age can be determined by fish scales, examination of teeth in many species, and with many methods both lethal and non-lethal. Wikipedia does not have an article with this exact name. ... Population dynamics is the study of marginal and long-term changes in the numbers, individual weights and age composition of individuals in one or several populations, and biological and environmental processes influencing those changes. ... A fishery (plural: fisheries) is an organized effort by humans to catch fish or other aquatic species, an activity known as fishing. ... Wildlife management is the process of keeping certain wildlife populations at desirable levels determined by wildlife managers. ... A giant grouper at the Georgia Aquarium Fish are aquatic vertebrates that are typically cold-blooded; covered with scales, and equipped with two sets of paired fins and several unpaired fins. ... Types of teeth Molars are used for grinding up foods Carnassials are used for slicing food. ... In biology, a species is one of the basic units of biodiversity. ...


Analyzing fisheries age class structure

An age class structure with gaps in it, for instance a regular bell curve for the population of 1-5 year-old fish, excepting a very low population for the 3-year-olds, implies a bad spawning year 3 years ago in that species. The normal distribution, also called Gaussian distribution by scientists (named after Carl Friedrich Gauss due to his rigorous application of the distribution to astronomical data (Havil, 2003)) is a probability distribution of great importance in many fields. ... Frog spawn Spawning is the production or depositing of eggs in large numbers by aquatic animals. ...


Often fish in younger age class structures have very low numbers because they simply went through the sampling nets, and may in fact have a very healthy population. Sampling is that part of statistical practice concerned with the selection of individual observations intended to yield some knowledge about a population of concern, especially for the purposes of statistical inference. ...

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  Results from FactBites:
 
Age Class Structure of a Desert Tortoise Population in the Tucson Mountains of Saguaro National Park (288 words)
Age Class Structure of a Desert Tortoise (Gopherus agassizii) Population in the Tucson Mountains of Saguaro National Park
The age distribution was evaluated alternatively by calculating a Lincoln Index estimate for each age class and by using simple models to adjust the age frequency distribution for effects of body size and distance to the plot boundary.
The age distribution of tortoise shell remains recovered in the Tucson Mountains indicates that egg and hatchling mortality is highest although sample sizes are small.
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