In most taxa, owners win fights when defending a territory against intruders. We calculated effect sizes for four factors that potentially contribute to an 'owner advantage'. We studied male fiddler crabs Uca mjoebergi, where owners won 92% of natural fights. Owners were not more successful because they were inherently better fighters (r=0.02). There was a small effect (r=0.18) of the owner's knowledge of territory quality (food availability) and a medium effect (r=0.29) of his having established relations with neighbours (duration of active tenure), but neither was statistically significant. There was, however, a significant effect due to the mechanical advantage the owner gained through access to the burrow during fights (r=0.48, p<0.005).

译文

在大多数分类单元中,所有者在捍卫入侵者的领土时会赢得战斗。我们计算了四个可能有助于 “所有者优势” 的因素的效应大小。我们研究了雄性招潮蟹Uca mjoebergi,那里的主人赢得了92% 的自然战斗。所有者并没有更成功,因为他们本质上是更好的战斗机 (r = 0.02)。所有者对领土质量 (食物供应) 的了解有很小的影响 (r = 0.18),而与邻居建立关系 (有效任期的持续时间) 有中等影响 (r = 0.29),但都没有统计学意义。但是,由于所有者在战斗中通过进入洞穴获得的机械优势而产生了显着影响 (r = 0.48,p<0.005)。

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