SIZE-ASSORTATIVE NEST CHOICE IN THE ABSENCE OF COMPETITION IN MALES OF THE SAND GOBY, POMATOSCHISTUS-MINUTUS
SIZE-ASSORTATIVE NEST CHOICE IN THE ABSENCE OF COMPETITION IN MALES OF THE SAND GOBY, POMATOSCHISTUS-MINUTUS
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DOI：
10.1007/bf00005855
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发表时间：
1995-07-01
影响因子：
1.4
通讯作者：
KVARNEMO, C
中科院分区：
文献类型：
--
作者：
KVARNEMO, C
选择大小相匹配的筑巢地点在有父亲照顾的鱼中很常见。这种模式可以通过大型雄性对喜欢的大型巢穴的卓越竞争能力来解释，或者可以通过与雄性自身身体大小相关的巢大小的选择来解释。在实验室和野外实验中，通过设置人工筑巢地点，研究了雄性小海鱼--细尾沙虎鱼的巢大小选择。在水族箱和野外实验中，巢大小与雄性大小呈正相关，表明存在大小不同的巢选择过程。这被认为是对最佳巢大小的偏好的结果，而不是由于竞争，因为：(A)自然界中的个体可以获得过剩的巢点；(B)在水族馆实验中，当让所有大小的单身雄性在较小和较大的巢点之间进行选择时，表现出对巢的偏好与其身体大小的比例，而不是对可用的最大巢的比例；在水族箱中，当只向单身雄性提供一个小的或只有一个大的筑巢地点时，小的雄性不会在大的地点筑巢，而在小的筑巢地点，各种大小的雄性都会筑巢。我的结论是，大小分类巢的选择是在没有竞争的情况下发生的，因此这不是大小分类筑巢的必要条件，与许多研究中通常假设的相反。这种偏好可能代表着在一个足够大的鸟巢可以容纳许多蛋的优势和一个较小的巢的维护和防御成本较低之间的妥协(或权衡)。
Size-assortative choice of nest site is commonly found among fish with paternal care. This pattern can be explained either by the superior competitive ability of large males for preferred large nests, or by a choice of nest size that is related to the male's own body size. Choice of nest size was studied in males of a small marine fish, the sand goby Pomatoschistus minutus, by providing artificial nest sites in laboratory and field experiments. A positive correlation between nest size and male size, indicating a size-assortative nest choice process, was found in both aquarium and field experiments. This is argued to be the outcome of a preference for an optimal nest size and not to be due to competition, as (a) a surplus of nest sites was available to the individuals in nature; (b) in the aquarium experiments, single males of all sizes, when offered a choice between a smaller and a larger nest site, showed a preference for nests in proportion to their body size and not for the largest available nests; and (c) in the aquaria, when single males were offered only a small or only a large nest site, small males abstained from building nests in the large sites, whereas in the small nest sites males of all sizes built nests. My conclusion is that size assortative nest choice occurred in the absence of competition, which thus is not a necessary condition for size-assortative nesting, contrary to what is commonly assumed in many studies. This preference may represent a compromise (or trade-off) between the advantage of a nest large enough to accommodate many eggs and a smaller one with lower maintenance and defence costs.