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Kenneth De Baets

Body-size distributions of organisms across in space and time are a powerful source of information on and processes. However, most studies only focus on selected parameters of distributions (e.g., central tendency or extremes) and rarely take into account entire and how they are affected by the style and

doi.org/10.2110/palo.2021.063

Distributions of log-transformed conch sizes of sporadoceratid ammonoids by main factors analyzed in this study (from left to right, top to bottom): A) By genus. B) By collection style. C) By lithology. D) By region.
Distributions of log-transformed conch sizes of sporadoceratid ammonoids by additional factors analyzed in this study (from top to bottom): A) By detailed classification of lithology. B) By collection procedure.
Kenneth De Baets

Here we analyze the impact of , , , and style over using diameter as a proxy of Late in their entirety using non-metric and based on distance.

doi.org/10.2110/palo.2021.063

NMDS analysis of all studied samples based on Kolmogorov distances between discrete distributions of conch size. Symbol sizes correspond to sample sizes and colors correspond to the mean log-size (yellow = smallest; purple = largest). Axes are scaled to half-change units (unity equals similarity of 0.5). Based on 41 samples corresponding to 6628 size measurements, but note that the ordination includes collections which are pooled individual bed samples (e.g., MM2ab contains pooled samples MM2a and MM2b). Pooled samples are: MM2cdefg, MM2ab, SR1_2, SR3_4_5_6, SI1abcd.
NMDS analysis of all studied samples as shown in Figure 1 but with samples marked according to levels of factors considered in the analysis. A) By region. B) By genus. C) By lithology. D) By collection style. Symbol sizes correspond to sample sizes.
Kenneth De Baets

The are then compared with effects on . In all , was the effect, with sizes by 59% in and by 33% in , as compared to . The effect of complete style was a in size by 11%.

doi.org/10.2110/palo.2021.063

Regression estimates obtained from a GLM model evaluating the additive effects of genus, lithology and collection style on log-transformed conch sizes (n = 5150).
Kenneth De Baets

was an important differentiating distributions, with distributions in and distributions in , suggesting that this parameter may reflect different degrees of . Most size were positively , but most strongly in marls. Complete led to values close to zero ( distributions) and high kurtosis.

doi.org/10.2110/palo.2021.063

Distributions of log-transformed conch diameters of sporadoceratid ammonoids by lithology classes.
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Kenneth De Baets

Food for thought from higher were on average smaller, but contained with the largest , highlighting the need to analyze entire . and differences need to be accounted for when evaluating differences across ( ) and ( ). Similarly, differences in may affect

doi.org/10.2110/palo.2021.063

Multivariate dispersion of size distributions based on Kolmogorov distances between them, according to sampling factors affecting their shapes (n = 33). A) By genus. B) By lithology. C) By collection style.
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