Figure 3
From: Rare polyandry and common monogamy in the firefly squid, Watasenia scintillans
Allocation of male reproductive resources in W. scintillans and other squids. (A–E) In W. scintillans, seasonal changes in the number of male-storing spermatophore (A), mantle length (B), body weight (C), testicularsomatic indices (D) and ovariansomatic indices (E) are plotted as the mean ± SE. Data points represent males in blue and females in red. Cyan boxes indicate the estimated mating period. For (A–E), total of 402 males and 950 females were examined. (F) A graph showing a comparison of male testicularsomatic indices among previously reported cephalopod species and W. scintillans found in this study (*). Data were extracted from the literature indicated by reference # (Table S1). The columns indicate the mean (blue column) or minimum (gray column) values specified in the literature, otherwise mean values were estimated (gradient column) from presented data points in the graphs. (G, H) The GSI values from male individuals are plotted against number of spermatophore (G, H) or testis weight (I, J) in W. scintillans (G, I) and highly promiscuous Idiosepius paradoxus (H, J). (K, L) In each individual, allocation of male reproductive resources to testis (K) or spermatophore (L) is expressed in percentage.
