Nest Site Habitat Preference and Competition in Gasterosteus aculeatus and G. wheatlandi
Nest Site Habitat Preference and Competition in Gasterosteus aculeatus and G. wheatlandi
复制标题
Gasterosteus aculeatus 和 G.wheatlandi 的巢址栖息地偏好和竞争
作者：
A. Cleveland
尖吻刺鱼和麦地刺鱼是同域分布的刺鱼物种，它们争夺合适的筑巢地点和筑巢材料。占主导地位的竞争对手尖吻腹龟是一种专门的物种，只有在植被存在的情况下才会筑巢。麦氏腹骨龟是一个多面手物种，在没有这些材料的情况下筑巢成功。麦氏腹肌可能会在这种通才行为中找到一个竞争的避难所，这种行为允许这两个物种在河口共存。在实验池塘中与尖吻海绵的竞争中，麦氏微囊藻的筑巢数量显著减少，筑巢地点离其喜好的地点更远，并将其喜好从蜈蚣转移到更远的地方。到与尖吻海龟结合的物种池中的其他巢栖息地。在组合种库中，麦地龙的存在对尖吻海龟的筑巢成功率没有显著影响。
Gasterosteus aculeatus and G. wheatlandi are sympatric stickleback species that compete for suitable nest sites and nest material. Gasterosteus aculeatus, the dominant competitor, is a specialist species and will nest only in the presence of vegetation. Gasterosteus wheatlandi is a generalist species and nests success- fully in the absence of these materials. Gasterosteus wheatlandi may find a com- petitive refuge in this generalist behavior which allows for the coexistence of the two species in the estuaries. In competition with G. aculeatus in experimental pools, G. wheatlandi built significantly fewer nests, nested further away from its preferred nest site, and shifted its preference from Enteromorpha sp. to other nest habitats in combined species pools with G. aculeatus. The presence of G. wheatlandi in combined species pools had no measurable effect on G. aculeatus' nesting success.