## 5 Conclusions  
This study presents an extensive and thorough collection of sulfur isotope values from modern samples originating from Greece. The samples include C3 and C4 plants, terrestrial animals (mammals), and aquatic life, i.e., fish. An analytical approach of the sulfur isotope values, along with carbon and nitrogen isotopes, provides valuable insights into the human diet, mobility, and residence for forensic studies. The \(\delta^{34}\)S, \(\delta^{13}\)C, and \(\delta^{15}\)N analysis of various plants and animals from Greece revealed a clear imprint in \(\delta^{34}\)S values demonstrating differences between terrestrial and aquatic animals derived from dietary resources from marine and/or freshwater reservoirs. The sulfur isotopic values of plants suggest that they have been mainly influenced by the rainfall, the marine aerosol, and the type of fertilizers used. Despite the fact that the geological structure of Greece is rather complex, the results yielded were not expected, suggesting that geology affected sulfur values much less than other factors. While variations in the \(\delta^{34}\)S values of animals that are fed mainly with resources originating from different geological regions (e.g., plains near cities or close to mountains, imported resources from other countries) might be expected, the results of the study do not prove this hypothesis. Thus, it can be assumed that the \"sea spray effect\" and rainfall both play a crucial role in the homogeneous range of sulfur isotopic values in Greece. Additionally, even if the data at first glance indicate that the regional geological setting plays an important role in the sulfur isotope fingerprinting, it appears to corroborate \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Conversion Data to Modern Hair Keratin (MKE) and to Modern Diet Equivalent (MDE)** & \(\mathbf{\leqslant}\)**13C (\%)** & \(\mathbf{\leqslant}\)**15N (\%)** & \(\mathbf{\leqslant}\)**34S** & **Source** \\ \hline Convert modern bone collagen to modern (2010) & \(-1.4\) & \(-0.9\) & & [51] \\ hair keratin (MKE) & & & & [90] \\ \hline Convert ancient atmospheric \(\delta^{13}\)C to modern (2010) atmospheric equivalent \(\delta^{13}\)C & & & & [92] \\ \hline Convert ancient bone collagen to Modern Hair Keratin (MKE), including conversion to modern \(\mathbf{\leqslant}\)13C & \(-3.3\) & \(-0.9\) & & [92] \\ \hline Convert modern keratin equivalent (MKE) to & \(-2.5\) & \(-5.15\) & & [50,51] \\ Modern Diet Equivalent (MDE) & & & & \(+2.5\)* & * [34] \\ \hline Convert modern bone collagen to modern hair & & & \(+0.4\) to \(+4.0\)** & **[8] \\ \hline Convert modern bone collagen to Modern Diet & & & \(+1.5\)* & * [34] \\ Equivalent (MDE) & & & \(-0.5\) to \(+0.5\)** & **[8] \\ \hline Convert modern keratin to Modern Diet & & & \(-2\)* & * [34] \\ Equivalent (MDE) & & & & **[8] \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Values for converting data to Modern Hair Keratin (MKE) and to Modern Diet Equivalent (MDE). * \(\delta^{34}\)S values of fractions from pig tissues under a Controlled Diet [36]; ** \(\mathbf{\leqslant}\)34S values of fractions from ox and goat tissues under a Controlled Diet [19]; *** \(\mathbf{\leqslant}\)34S values of fractions from horses under a Controlled Diet (C3—plant diet; C4—plant diet). that the type of fertilizers, the aerosol marine, and the soil claim an antagonistic role in the final sulfur value of the products. Furthermore, the observed substantial overlaps reduce the effect of the application of sulfur to palaeodietary reconstruction. In various localities with a uniform surface geology, negligible variation in the geological source(s) of sulfur is observed, which is ultimately assimilated by terrestrial fauna. On the other hand, freshwater fish present more diverse sulfur sources in contrast to terrestrial fauna in areas with complicated surface geology, as the former exhibit different and variable \(\delta^{34}\)S profiles compared to the latter.