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首页> 外文期刊>The wilson journal of ornithology >Diet of the Crested Guan (Penelope purpurascens) in Panama: Leaf-eating by a Tropical Frugivore
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Diet of the Crested Guan (Penelope purpurascens) in Panama: Leaf-eating by a Tropical Frugivore

机译：巴拿马凤头鹦鹉（Penelope purpurascens）的饮食：热带食肉类的叶子吃

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摘要

We studied the diet of Crested Guans (Penelope purpurascens; Galliformes: Cracidae) in lowland tropical forest on Barro Colorado Island, Panama. From June-August 2015 we collected observations of foraging adults using five-minute focal follows of randomly chosen individuals. A total of 141 food items were recorded over 565 minutes of observations. Although Crested Guans are believed to be primarily frugivorous, we found that they consumed a high proportion of leaves (61.7% of items) and insects (24.8%), with fruits comprising a minority of items (13.5%)). Guans preferred to eat young leaves, which are more tender and contain higher levels of nitrogen than mature leaves; however, young leaves also contain higher levels of tannins and other secondary defensive compounds, raising new questions about the mechanisms by which arboreal birds digest leaves. Recent studies have found similarly high levels of leaf consumption in other species of guans and chachalacas, suggesting that folivory may be more widespread in the family Cracidae than previously realized.
机译：我们研究了在巴拿马巴罗科罗拉多岛的低地热带森林中凤头Guan（Penelope purpurascens；鸡形目：Cracidae）的饮食。从2015年6月至8月，我们使用随机选择的个体进行的5分钟聚焦追踪收集了成年觅食的观察结果。在565分钟的观察时间内总共记录了141种食品。尽管人们认为凤头Guan主要是节食的，但我们发现它们消耗了高比例的叶子（占61.7％的物品）和昆虫（占24.8％）的果实，其中水果占少数（13.5％）。关氏更喜欢吃嫩叶，嫩叶比成熟叶更嫩，氮含量更高。然而，幼叶还含有较高水平的单宁酸和其他次要防御性化合物，这引发了有关树栖鸟类消化叶片的机制的新问题。最近的研究发现，其他种类的guans和chachalacas中的叶片消耗量也相似，这表明，在科科中，叶状体的分布可能比以前更广泛。

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