Table 1.

Levels of mating assortment (SCIC) and average polyandry estimated from empirical studies across different taxa

Taxonomic groupMean SCIC (range)Mean group size (range)Mean polyandry (±SE)Mean mating density (±SE)No. of estimates (studies)Species (alphabetical)Refs. (chronological)
Arthropod−0.143 (−0.717 to 0.182)57.375 (21–161)3.824 (0.295)0.174 (0.025)16 (6)Aquarius remigis17, 45, 46, 8486
Gryllus campestris, Laupala cerasina, Rhynchophorus ferrugineus, Serracutisoma proximum
Bird−0.206 (−0.616 to 0.127)20.682 (12–22)5.16 (0.378)0.544 (0.036)22 (2)Gallinago media, Gallus gallus32, 87
Mammal−0.294 (−1.163 to 0.375)12.667 (7–18)2.01 (0.303)0.34 (0.027)12 (8)Alouatta caraya, Canis familiaris, Cryptoprocta ferox, Lemur catta, Macaca fascicularis, Mandrillus sphinx, Saimiri oestedi,8895
Mollusc−0.511 (—)53 (—)2.111 (—)0.06 (—)1 (1)Sepia apama96
Reptile−0.134 (—)59 (—)1.8 (—)0.053 (—)1 (1)Agkistrodon contortrix97
  • Mating assortment (Sperm competition intensity correlation; SCIC) calculated from 52 empirical sexual networks provided in 18 studies, grouped by taxon along with the population/group size, average polyandry, average mating density, species name and reference.