How does the composition of the community affect species richness estimates?

\begin{tabular}{|c|c|c|r|} \hline & A & B & \multicolumn{2}{|c|}{ C } \\ \hline 1 & Sampling Species Richness \\ \hline 2 & & \multicolumn{2}{|c|}{} \\ \hline 3 & & & \\ \hline 4 & Species & \# in pop & \\ \hline 5 & \multicolumn{2}{|c|}{ Tally } & \\ \hline 6 & 2 & 900 & 900 \\ \hline 7 & 20 & 920 \\ \hline 8 & 3 & 10 & 930 \\ \hline 9 & 4 & 10 & 940 \\ \hline 10 & 5 & 10 & 950 \\ \hline 11 & 6 & 10 & 960 \\ \hline 12 & 7 & 10 & 970 \\ \hline 13 & 8 & 10 & 980 \\ \hline 14 & 9 & 10 & 990 \\ \hline 15 & 10 & 10 & 1000 \\ \hline 16 & Total = & 1000 & \\ \hline \end{tabular} \begin{tabular}{|c|c|c|r|} \hline & A & B & \multicolumn{2}{|c|}{ C } \\ \hline 1 & Sampling Species Richness \\ \hline 2 & & \multicolumn{2}{|c|}{} \\ \hline 3 & & & \\ \hline 4 & Species & \# in pop & \\ \hline 5 & \multicolumn{2}{|c|}{ Tally } & \\ \hline 6 & 2 & 900 & 900 \\ \hline 7 & 20 & 920 \\ \hline 8 & 3 & 10 & 930 \\ \hline 9 & 4 & 10 & 940 \\ \hline 10 & 5 & 10 & 950 \\ \hline 11 & 6 & 10 & 960 \\ \hline 12 & 7 & 10 & 970 \\ \hline 13 & 8 & 10 & 980 \\ \hline 14 & 9 & 10 & 990 \\ \hline 15 & 10 & 10 & 1000 \\ \hline 16 & Total = & 1000 & \\ \hline \end{tabular}