Table 7.

Top 10 publications identified by the co-citation analysis, ranked according to Sigma scores.

Title	Degree	Centrality	Sigma	References
The effect of social experience on serotonergic modulation of the escape circuit of crayfish	11	0.36	156.19	[47]
A review of the ever increasing threat to European crayfish from non-indigenous crayfish species	14	0.07	104.17	[8]
Serotonin and aggressive motivation in crustaceans: Altering the decision to retreat	5	0.18	10.02	[48]
Roles of crayfish: Consequences of predation and bioturbation for stream invertebrates	14	0.16	5.82	[49]
Managing invasive crayfish: Is there a hope?	6	0.06	5.03	[42]
Mechanosensory integration in the crayfish abdominal nervous system: Structural and physiological differences between interneurons with single and multiple spike initiating sites	13	0.17	7.8	[50]
Invaders for sale: Trade and determinants of introduction of ornamental freshwater crayfish	16	0.05	3.6	[9]
Invasive crayfish in Europe: The impact of Procambarus clarkii on the littoral community of a Mediterranean lake	9	0.08	4.39	[51]
Loss of diversity and degradation of wetlands as a result of introducing exotic crayfish	16	0.08	3.26	[52]
Continental-wide distribution of crayfish species in Europe: Update and maps	10	0.02	2.99	[10]