FOOD LIMITATION AND COMPETITION - A FIELD EXPERIMENT WITH 2 CARABUS SPECIES
FOOD LIMITATION AND COMPETITION - A FIELD EXPERIMENT WITH 2 CARABUS SPECIES
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DOI：
10.2307/4352
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发表时间：
1984-01-01
影响因子：
4.8
通讯作者：
LENSKI, RE
中科院分区：
文献类型：
--
作者：
LENSKI, RE
进行了一项实地实验，以评估食物限制和竞争对阿巴拉契亚南部森林中两种掠食性地面甲虫的影响。食物补充剂显着增加了非幼虫（繁殖期）和幼虫（繁殖前）C.limbatus Say 成虫的平均体重。食物补充剂对非软性 C.limbatus 成虫的存活没有影响。食物补充剂可能提高了软角线虫成虫的存活率，尽管这种效果不太显着。幼虫的数量显着增加且出现较早，这表明非软性 C.limbatus 成虫对食物补充的反应增加了繁殖。在食物补充地块上，幼虫 C.limbatus 成虫的招募也显着增加。在食物补充地块上，软性和非软性 C.limbatus 成虫的活动均显着降低，这表明它们的大部分正常活动与觅食有关。 C. sylvosus Say 没有接受 C. limbatus 可用的任何补充食物，但 C. sylvosus 在食物补充地块上的重量明显高于对照地块。 C. sylvosus 觅食成功率的提高归因于与 C. limbatus 对天然食物的竞争减少。
A field experiment was conducted to assess the effects of food limitation and competition on 2 predatory ground beetles in a southern Appalachian forest. Food supplementation significantly increased the average body mass of both non-teneral (reproductive) and teneral (prereproductive) C. limbatus Say adults. Food supplementation had no effect on the survival of non-teneral C. limbatus adults. Food supplementation may have improved the survival of teneral C. limbatus adults, although this effect was marginally non-significant. Increased reproduction by non-teneral C. limbatus adults in response to food supplementation was indicated by significantly more abundant and earlier appearing larvae. Recruitment of teneral C. limbatus adults was also significantly greater on food supplementation plots. The activity of both teneral and non-teneral C. limbatus adults was significantly lower on food supplementation plots, indicating that much of their normal activity is associated with foraging. C. sylvosus Say received none of the supplemental food available to C. limbatus, yet C. sylvosus weighed significantly more on food supplementation plots than on control plots. This improved foraging success of C. sylvosus is attributed to reduced competition with C. limbatus for naturally occurring food.