Vegetation exploitation by barnacle geese Branta leucopsis during incubation on Svalbard
Vegetation exploitation by barnacle geese Branta leucopsis during incubation on Svalbard
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DOI：
10.1111/j.1751-8369.1998.tb00255.x
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发表时间：
1998-06-01
期刊：
影响因子：
1.9
通讯作者：
Gabrielsen, GW
中科院分区：
文献类型：
--
作者：
Alsos, IG;Elvebakk, A;Gabrielsen, GW
本文研究了斯瓦尔巴群岛斯托霍尔门的植被开发以及食物供应对藤壶雁繁殖饮食和行为的影响。详细的植被测绘用于估计每对鹅的食物供应量。通过分析粪便中的植物碎片来评估饮食成分。记录了鹅与融雪模式相关的行为。大多数植被类型都被鹅用来进食或作为巢穴基质，在早期无雪的山脊上，巢穴密度最高，领地最小，尽管晚期繁殖的个体也在苔藓苔原植被中筑巢。大多数鹅对在其领地内利用多种植被类型，这延长了植物在营养上对鹅最有利的时期的进食时间。领地面积随着最受青睐的食用植物密度的降低而增加。雌鹅偏爱营养品质高的植物，孵化期间的饲料组成为41%的杂草花、19%的草、6%的杂草叶和芽、34%的苔藓。当草的供应量达到
The paper is a study of vegetation exploitation and the effect of food availability on the diet and behaviour in barnacle geese breeding at Storholmen, Svalbard. Detailed vegetation mapping was used to estimate the availability of food to individual pairs of geese. Diet composition was assessed through analysis of plant fragments in droppings. The behaviour of geese in relation to snowmelt patterns was recorded. Most vegetation types were exploited by the geese either for feeding or as nest substrate, Nest density was highest and territories were smallest on early, snow-free ridges, although late breeding individuals also nested in moss tundra vegetation. Most geese pairs exploited a mosaic of vegetation types in their territories, which extended the feeding period when plants were nutritionally most profitable to the geese. Territory size increased with decreasing density of the highest preferred food plants. Female geese preferred plants with high nutrient quality, and the diet during incubation consisted of 41% flowers of forbs, 19% grasses, 6% leaves and buds of forbs, and 34% mosses. When the availability of grasses was