Table 3. Network statistics describing the collaboration among identified core scientists working on biodiversity during different time periods.

Time period	Average degree	Mean weighted degree	Modularity	Number of modularity clusters
1980–1994	1.533	4.533	0.85	71
2000–2014	3.885	36.016	0.634	63
1945–2014	3.702	33.095	0.647	87