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What use id the sclero- without the cronology? The hake example

AutorGeffen, Audrey J.; Morales-Nin, Beatriz
Fecha de publicación18-may-2013
Citación3rd International Sclerochronology Conference (2013)
ResumenThe “Time-Keeping” property of calcified tissues may be their most valuable characteristic, and one that is often taken for granted. The ability to related a measurement of growth increment, chemical composition, or isotopic value to a discreet point in time forms the underlying basis for most of our work. However, it is not always easy to detect or interpret a temporal signal in the growth of calcified tissues. This has led to two parallel lines of investigation - (1) experiments and observations designed to validate the periodicity of accretion, or (2) image analysis and “smart” systems to search for periodicities in visual patterns. But what if there are no patterns? Is it possible that biomineralization can proceed aperiodically? How can we accommodate any “non-patterns” into the studies that rely on calcified tissue analysis? The otoliths of hake (Merluccius merluccius) are a good example of the problem. Over the past four decades, an increasing amount of effort has been channelled into improving the quality of age estimation data that is derived from otolith analysis, to support sustainable management of hake fisheries. Identification of annual increments is difficult, and consensus on interpretation of features can be as low as 20-40%. Recent tagging experiments have shown that hake grow much faster than suspected, and also that many of the increments are not annual and have little link with seasonal variations. They appear to reflect random events or individual movements. Despite intense analysis, it might be that these increments are “non-periodic”, at least at the population level. Nevertheless, there are many sclerochronolgy techniques that do not rely on an absolute timeframe. Some otolith features are linked to life-history stages and can be used as habitat tags. Other questions can be addressed from measurements made of the otolith core or most recent growth. Most importantly, it is time to consider that this is only one example of a more widespread phenomenon, and we need to develop methods of interpretation to extract the most out of non-linear and aperiodic information
DescripciónPóster presentado en la 3rd International Sclerochronology Conference, celebrada del 18 al 22 de mayo de 2013 en Caernarfon, North Wales (Reino Unido)
URIhttp://hdl.handle.net/10261/123434
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