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Fig. 1 | BMC Ecology and Evolution

Fig. 1

From: Differential allocation in a gift-giving spider: males adjust their reproductive investment in response to female condition

Fig. 1

Investment in a flies and b silk added to the nuptial gift by males of the spider Paratrechalea ornata. a Proportion of flies captured by males exposed to females in POOR condition (white dots) and GOOD condition (black dots). Given that we offered approximately 40 flies for each male, the higher the proportion of flies added to gift, the larger it is. The time spent by the females close to the glass barrier in the experimental arena was included a continuous predictor variable because it represents the visual and/or short-range, substrate-borne vibratory stimulus received by the males during the pre-copulatory phase. Lines indicate the tendency predicted for males exposed to each experimental group: dashed = females in POOR condition; solid = females in GOOD condition. b Probability of a male adding more silk to the gift after physically interacting with the female in response to his previous investment in silk (i.e., the time spent adding silk to the gift before physically interacting with the female). Circle sizes are proportional to the number of superimposed data points. In both graphics the shaded area indicates the 95 % confidence interval

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