Effects of Habitat and Human Activities on Species Richness and Assemblages of Staphylinidae (Coleoptera) in the Baltic Sea Coast

Table 5

Species richness and median abundance of three species in four sandy beaches closed to tourists and two beaches open to tourists with results of t-test or U test; significant differences are underlined.

Situation of beach	n traps	Species richness				Aleochara bipustulata	Polystomota grisea	Polystomota punctatella
		Species per trap	S.D	Jackknife II	S.D.	Median	Median	Median
Closed	16	11.6	4.2	109	6.3	28.0	2.0	1.0
Open	8	6.8	1.8	56	3.4	2.5	0.0	0.0
t/Z		3.1				3.7	2.5	0.6
P		0.005		<0.001		<0.001	0.01	0.5