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Offspring mass development depending on their relatedness to the caring female (0, 33, 66 and 100% foster treatment). Spiderlings of the sibling broods (0 and 100% foster) gained significantly more mass than those belonging to the 33% foster treatment, while the 66% foster treatment was not significantly different from the other treatments (a and b express the statistical difference, Tukey contrasts p < 0.05).
