Table 4. Annual percentage change in the frequency of research types and problem-solving studies, in ecological research 1980–2010.

	Percent of annual average change (95% CI)
Research Type	All journals	Core Journals
Observation	NS	NS
Experiments	NS	NS
Models	NS	3.5 (0.8–6.2)**
Data Analysis	4.9 (1.7–8.1)**	NS
Problem Solving	4.7 (2.3–7.1)***	5.5 (3.0–8.1)***

^***Change is significant at the Bonferroni-adjusted level, p<0.001, ** p<0.01, * p<0.05.