Succession in subtidal macrofouling assemblages of a Patagonian harbour (Argentina, SW Atlantic)

Table 1 Summary of two-way ANOVAs of the effect of substratum orientation and succession length or starting season on species richness and the Shannon diversity index

Source	df	MS	F	P
Succession analysed at quarterly intervals
Species richness^a
Surface orientation	1	0.1994	22.0	<0.0001
Succession length	3	0.0219	2.4	0.09
Surface orientation × succession length	3	0.0152	1.7	0.20
Error	24	0.0091
Shannon index
Surface orientation	1	1.1256	12.2	<0.01
Succession length	3	0.2117	2.3	0.10
Surface orientation × succession length	3	0.3484	3.8	0.02
Error	24	0.0920
1-year-old assemblages starting at different seasons
Species richness^a
Surface orientation	1	0.3360	34.4	<0.0001
Starting season	3	0.0026	0.3	0.85
Surface orientation × starting season	3	0.0192	2.0	0.15
Error	24	0.0098
Shannon index
Surface orientation	1	3.7725	58.2	<0.0001
Starting season	3	0.0612	0.9	0.44
Surface orientation × starting season	3	0.0486	0.7	0.53
Error	24	0.0648

Significant results in bold
df Degrees of freedom, MS mean square, F F ratio, P probability values associated with F values
^aLog-transformed data

ISSN: 1438-3888