Code: Select all
\documentclass[a4paper,12pt]{article}
\usepackage{multicol}
\usepackage{multirow}
\usepackage{array}
\usepackage[margin=2cm,bottom=2cm]{geometry}
\begin{document}
\begin{footnotesize} \setlength{\extrarowheight}{2mm}
\begin{tabular}{| l | l | l | l | l | l | l | l | l |}
\hline
& & & \multicolumn{3}{c}{Total colony} & & & \\
& & & \multicolumn{3}{c}{forming units per} & & & \\
Site & Site name & Transect & \multicolumn{3}{c}{100 mL} & Mean & Variance & Standard \\
\cline{4-6}
number & & & Depth & Depth & Depth & & & Deviation \\
& & & 0 m & 1,5 m & 3 m & & & \\ \hline
2 & Møhlenpris & Inner & 20 & 20 & 10 & \multirow{4}{*}{11,25}& \multirow{4}{*}{155,11} & \multirow{4}{*}{12,46} \\ \hline
3 & Marineholmen & Inner & $<10$ & $<10$ & 10 & \\ \cline{1-6}
4 & Damsgård & Inner & 10 & 10 & 10 & \\ \cline{1-6}
5 & Solheimsviken & Inner & $<10$ & 50 & 10 & \\ \hline
1 & Nordnes & Outer & 10 & $<10$ & $<10$ & \multirow{2}{*}{10,83} & \multirow{2}{*}{54,17} & \multirow{2}{*}{3,36} \\ \cline{1-6}
6 & Laksevåg & Outer & $<10$ & $<10$ & $<10$ & \\
\hline
\end{tabular}
\end{footnotesize}
\end{document}