Parent record: Owner advantage in the fiddler crab, Uca mjoebergi: Investigating why owners win more contests?

资源所有者通常会赢得与入侵者的竞争，这种现象被称为“所有者优势”（OA）。mjoebergi招潮蟹是一种典型的招潮蟹，具有高度的社会性，领土性，生活在潮间带泥滩的混合性别群体中。洞穴用于领土防御，交配，以及作为躲避捕食者和环境压力的避难所。在所有者和为领土和洞穴的所有权而战的浮动男性之间的战斗是常见的。<br /> <br /> 实验于2006年9月28日至12月30日在东点保护区内的Ludmilla Creek下游进行，该保护区位于达尔文以北5公里处。这一系列的实验是为了评估所有者-浮动股东之间的不对称性对所有者优势的贡献。<br /> <br /> 研究表明，在Uca mjoebergi的OA是90%。飞蚊被发现并不是较差的战士，在标准化治疗中表现得和同样大小的主人一样好。这意味着除了战斗能力之外的不对称性也导致了大量的OA。机械优势被认为是非常显着的提供优势，业主在战斗中。在低潮时，业主比入侵者更有动力，因为他们对领土的投资。随着潮水的滚滚而来，预计漂浮物所有者会经历动机对称，然而这并没有减少所有者战斗的成功。事实上，当动机提高到对称时，业主赢得了更多的比赛。高质量的领土对竞赛和所有者动机的影响很弱。虽然高质量地区的业主赢得了更多的比赛，但这并不是一个显着的差异。结果还表明，有一种趋势，业主斗争的成功，增加投资的邻居关系。

Resource owners generally win contests against intruders, a phenomenon referred to as the 'Owner Advantage' (OA). Uca mjoebergi is a typical fiddler crab that is highly sociable, territorial and lives in mixed sex colonies on intertidal mudflats. Burrows are used in territory defence, for mating, and as refuge from predators and environmental stresses. Fights are common between owners and floating males who battle for ownership of the territory and burrow. <br /> <br /> Experiments were conducted from 28th Sept - 30 Dec 2006 at the lower reaches of Ludmilla Creek within East Point Reserve, 5km North of Darwin, NT. The series of experiments was run to assess which asymmetries between owner-floater contribute to the owner advantage. <br /> <br /> The studies reveal that in Uca mjoebergi the OA is &gt;90%. Floaters were found not to be poorer fighters, performing just as well as owners of the same size in standardised treatments. This meant that asymmetries other than fighting ability were contributing to the substantial OA. Mechanical advantage was found to be highly significant providing advantage to owners during fights. At low tide owners are more motivated than intruders based on their investment in territory. As the tide rolls in it was expected that floaters-owners experience motivational symmetry, however this was found not to reduce owner fighting success. In fact, when motivation was heightened to symmetric, owners won more contests. The effects of high quality territories on contests and owner motivation were weak. Although owners in high quality territories won more contests this was not a significant difference. The results also indicate there was a trend for owner fighting success to increase with an increase in the investment in neighbour relations.