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Male-like behavioral patterns and physiological alterations induced by androgenic gland implantation in female crayfish

Assaf Barki1,*, Ilan Karplus1, Isam Khalaila2, Rivka Manor2 and Amir Sagi2

1 Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, the Volcani Center, PO Box 6 Bet Dagan 50250, Israel
2 Department of Life Sciences and the Institute for Applied Biosciences, Ben-Gurion University of the Negev, PO Box 653 Beer-Sheva 84105, Israel



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  		Fig. 1. Behavioral parameters in pair encounters involving androgenic gland (AG)-implanted (IMP) and intact (NON) C. quadricarinatus females in different combinations: IMP–IMP (N=10), NON–NON (N=9), IMP–NON (N=8). (A) Latency from lifting the dividers to first interaction (white bars) and escalated fight (gray bars). The difference between the gray and white bars denotes the time lapse from the start of interaction to escalated fighting (the adjacent letters refer to this difference). (B) Duration of escalated fighting. (C) Frequency of crawling-over. Values are means ±S.E.M. Bars not sharing a letter are significantly different (Kruskal–Wallis test, P<0.05, followed by Mann–Whitney U-test, P<0.016).

 

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© The Company of Biologists Ltd 2003