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\begin{document}
\begin{table}
\caption{Test}
\centering
\begin{tabular}{
  lc*{6}{S[table-format=-2.2(2)]}
}
\toprule
\multicolumn{1}{c}{Species} & Season & {Wet} & {Dry} & {Wet} & {Dry} & {Wet} & {Dry} \\
\midrule
\textit{Genus A}   & N &       &       &       &       &       & 81.82\pm0.36\ts{(4)} \\
\textit{Species A} & C &       &       &       &       &       & -19.73\pm0.29\ts{(4)} \\
\textit{Genus B}   & N &  5.14\pm1.21\ts{(16)} &  13.1 \pm1.2\ts{(18)} &3.7\pm0.85\ts{(16)} &12.55\pm0.84\ts{(16)} & 12.32\pm0.64\ts{(15)} & 12.27\pm0.47\ts{(16)} \\
\textit{Species B} & C & -18.38\pm0.64\ts{(16)} & -17.25\pm0.44\ts{(18)} &-6.66\pm0.39\ts{(16)} &-16.67\pm0.59\ts{(16)} & -16.77\pm0.3\ts{(15)} & -15.98\pm0.37\ts{(16)} \\
\end{tabular}
\end{table}


\begin{table}
\centering
\begin{tabular}{ l *{2}{S[table-format=2.1(1)]} S[table-format=+2.1(1)] }
    \hline
    {$U_\textrm{RMS},\,\si{\kilo\volt}$} &
    {$N_{[+]}$} &
    {$N_{[-]}$} &
    {$D,\,\% $}
    \\
    \hline\hline
    \multicolumn{4}{l}
    {\scriptsize all detected}
    \\
    1.4 &
    7.0\pm1.6 &
    9.5\pm2.2 &
    -7.4\pm12.9
    \\
    1.6 &
    8.5\pm1.7 &
    13.4\pm2.3 &
    -1.1\pm11.5
    \\
    1.8 &
    12.2\pm2.2 &
    15.5\pm2.7 &
    +2.7\pm11.7
    \\
    2.0 &
    15.5\pm2.3 &
    18.8\pm2.7 &
    +5.4\pm9.1
    \\
    2.2 &
    19.7\pm2.7 &
    19.0\pm2.8 &
    +30.5\pm10.0
    \\
    2.4 &
    24.0\pm2.8 &
    20.0\pm2.8 &
    +31.2\pm8.8
    \\
    \hline
    \multicolumn{4}{l}
    {$\scriptstyle r \geq 50\%$}
    \\
    1.4 &
    6.9\pm1.6 &
    9.1\pm2.1 &
    -4.9\pm13.0
    \\
    1.6 &
    8.4\pm1.7 &
    12.5\pm2.2 &
    +1.4\pm11.7
    \\
    1.8 &
    11.9\pm2.1 &
    14.6\pm2.7 &
    +5.0\pm11.9
    \\
    2.0 &
    15.2\pm2.2 &
    18.0\pm2.6 &
    +6.8\pm9.3
    \\
    2.2 &
    18.5\pm2.6 &
    15.9\pm2.6 &
    +33.4\pm10.3
    \\
    2.4 &
    23.1\pm2.8 &
    18.0\pm2.7 &
    +33.4\pm9.0
    \\
    \hline
    \multicolumn{4}{l}
    {$\scriptstyle r \geq 75\%$}
    \\
    1.4 &
    5.4\pm1.6 &
    6.6\pm1.9 &
    +3.9\pm16.6
    \\
    1.6 &
    7.3\pm1.6 &
    8.0\pm2.0 &
    +14.7\pm14.1
    \\
    1.8 &
    10.3\pm2.0 &
    10.2\pm2.3 &
    +18.0\pm13.8
    \\
    2.0 &
    14.1\pm2.1 &
    13.8\pm2.4 &
    +15.9\pm10.6
    \\
    2.2 &
    15.8\pm2.4 &
    10.6\pm2.1 &
    +44.2\pm11.4
    \\
    2.4 &
    20.1\pm2.7 &
    13.3\pm2.3 &
    +41.9\pm9.5
    \\
    \hline
\end{tabular}
\end{table}

\end{document}