2015
DOI: 10.1017/pab.2014.10
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On the benefits of being redundant: low compositional fidelity of diatom death assemblages does not hamper the preservation of environmental gradients in shallow lakes

Abstract: Comparisons between death assemblages and their source living communities are among the most common actualistic methods of evaluating the preservation of compositional and environmental information in fossil assemblages. Although live-dead studies have commonly focused on marine mollusks, the potential of diatoms to preserve ecological information in continental settings has been overlooked. Thus, little is known about the nature and magnitude of the taphonomic biases affecting live-dead agreement of diatom as… Show more

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Cited by 17 publications
(16 citation statements)
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References 62 publications
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“…Regardless of water depth, most shells in the mixed layer disintegrate quickly, with decadal-scale half-lives, whereas a small subset of shells persist for millennia by attaining a refuge from high loss rates. This postmortem persistence permits death assemblages sampled at local scales to carry information on composition and diversity accrued over long temporal scales, permitting the capture of regional-scale composition (Warme 1969; Kowalewski et al 1998; Smith 2008; Tomašových and Kidwell 2010; Miller et al 2014; Hassan 2015) even when most shells disintegrate quickly. This consistency in dynamics across the shelf, derived from AFD data, is also encouraging for habitat-scale paleoecological inference: it suggests that bathymetric variation in live-dead agreement in species composition that is encountered in some meta-analyses (e.g., Kidwell 2001; Tomašových and Kidwell 2011) arises from differences in scales of time averaging (and thus environmental condensation) rather than from bias per se (interspecies differences in preservation), a distinction that has not previously been possible.…”
Section: Discussionmentioning
confidence: 99%
“…Regardless of water depth, most shells in the mixed layer disintegrate quickly, with decadal-scale half-lives, whereas a small subset of shells persist for millennia by attaining a refuge from high loss rates. This postmortem persistence permits death assemblages sampled at local scales to carry information on composition and diversity accrued over long temporal scales, permitting the capture of regional-scale composition (Warme 1969; Kowalewski et al 1998; Smith 2008; Tomašových and Kidwell 2010; Miller et al 2014; Hassan 2015) even when most shells disintegrate quickly. This consistency in dynamics across the shelf, derived from AFD data, is also encouraging for habitat-scale paleoecological inference: it suggests that bathymetric variation in live-dead agreement in species composition that is encountered in some meta-analyses (e.g., Kidwell 2001; Tomašových and Kidwell 2011) arises from differences in scales of time averaging (and thus environmental condensation) rather than from bias per se (interspecies differences in preservation), a distinction that has not previously been possible.…”
Section: Discussionmentioning
confidence: 99%
“…Por lo tanto, en base a la gran cantidad sistemática de datos ecológicos y taxonómicos de las especies, comienzan a usarse como bioindicadores de calidad de agua y bioproxy para las reconstrucciones paleoambientales de los cuerpos de agua (Battarbee 1986;Smol 2009). También, se evalúa su fidelidad composicional y ambiental desde una perspectiva de la Tafonomía actualística, experimental y comparativa (Hassan et al 2008, Flower y Ryves 2009Ryves et al 2009;Hassan 2015). Estas tendencias de investigación continúan intensificando y complejizándose hasta la actualidad.…”
Section: Breve Historiaunclassified
“…disolución) y físicos (ej. fragmentación) que afectan sus valvas, generando posibles distorsiones y/o sesgos en las interpretaciones (Hassan 2015). Estos procesos pueden ser generados por condiciones naturales en el momento de su depositación (ej.…”
Section: Algunas Precauciones Generalesunclassified
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“…Geohistorical records contain valuable data on past generations of organisms and community states and are increasingly used as tools for conservation, including biodiversity assessment; identification of invasive species; recognizing past, prestress ecosystem states; and monitoring the progress of restoration (e.g., Swetnam et al 1999; National Research Council 2005; Smith 2008; Tsumjimoto et al 2008; Rick and Lockwood 2013; Lotz and McClenacha 2014; Dietl et al 2015; Kidwell 2015). Comparison of living communities with their locally accumulating death assemblages—that is, dead and discarded organic remains produced by the living community, such as shells, bones, molts, and cysts—is proving to be a useful tool in marine, lacustrine, and estuarine environments (Warwick and Light 2002; Alin and Cohen 2004; Kidwell 2007, 2013; Pyenson 2011; Weber and Zuschin 2013; Casey et al 2014; Korpanty and Kelley 2014; Hassan 2015; Zuschin and Ebner 2015; Archuby et al 2015; Smith and Dietl 2016; Powell et al 2017). Empirical studies, including modeling of repeatedly sampled living assemblages and geologic age dating of skeletal remains, demonstrate that death assemblages are time-averaged accumulations of individuals from many generations (e.g., Peterson 1976, 1977; Smol et al1984; Dixit et al 1989; reviews by Kidwell 2013; Kidwell and Tomašových 2013).…”
Section: Introductionmentioning
confidence: 99%