Spring hunting changes the regional movements of migrating greater snow geese
Spring hunting changes the regional movements of migrating greater snow geese
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DOI：
10.1046/j.1365-2664.2003.00812.x
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发表时间：
2003-06-01
影响因子：
5.7
通讯作者：
Hines, JE
中科院分区：
文献类型：
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作者：
Béchet, A;Giroux, JF;Hines, JE
1.人类引起的干扰，如狩猎，可能影响长途移徙者的移徙行为。1999年和2000年，北美自1916年以来首次出现了对大雪雁的春季狩猎，旨在阻止人口增长以保护自然栖息地。我们评估了这次狩猎对鹅群沿加拿大魁北克南部圣劳伦斯河沿着600公里的分段运动的影响。我们跟踪无线电标记的雌鹅在三个相邻区域的集结区从西南到东北：圣皮埃尔湖，上河口和下河口，在1997年春天（n = 37）和1998年（n = 70）建立狩猎前，并在1999年（n = 60）和2000年（n = 59）狩猎期间。我们使用多状态捕获-再捕获模型来估计这些区域之间的无线电标记的女性的运动概率。为了评估干扰水平，我们在鹅的觅食行程中跟踪它们，并估计在不受干扰的情况下完成觅食回合的概率。在2年没有狩猎，迁移是强烈的单向性从西南到东北，与很低的向西移概率。鹅群逐渐从圣皮埃尔湖迁移到上河口，然后从上河口迁移到下河口。相比之下，在2年狩猎向西移的可能性是前几年的四倍多。大多数这些向后移动发生在狩猎开始后不久，表明鹅回到了它们以前没有经历过狩猎的地区。总体干扰水平增加，在所有地区的狩猎年相对于没有狩猎的年份。合成与应用。我们的结论是，春季狩猎改变了这种长途迁徙的中途停留时间安排，并可能通过减少婚前育肥进一步影响种群动态。春季狩猎也可能增加了农作物的损失。我们建议，错开狩猎开放日期可以减弱这种管理行动的次级影响。
1. Human-induced disturbance such as hunting may influence the migratory behaviour of long-distance migrants. In 1999 and 2000 a spring hunt of greater snow geese Anser caerulescens atlanticus occurred for the first time in North America since 1916, aimed at stopping population growth to protect natural habitats.2. We evaluated the impact of this hunt on the staging movements of geese along a 600-km stretch of the St Lawrence River in southern Quebec, Canada.3. We tracked radio-tagged female geese in three contiguous regions of the staging area from the south-west to the north-east: Lake St Pierre, Upper Estuary and Lower Estuary, in spring 1997 (n = 37) and 1998 (n = 70) before the establishment of hunting, and in 1999 (n = 60) and 2000 (n = 59) during hunting.4. We used multi-state capture-recapture models to estimate the movement probabilities of radio-tagged females among these regions. To assess disturbance level, we tracked geese during their feeding trips and estimated the probability of completing a foraging bout without being disturbed.5. In the 2 years without hunting, migration was strongly unidirectional from the south-west to the north-east, with very low westward movement probabilities. Geese gradually moved from Lake St Pierre to Upper Estuary and then from Upper Estuary to Lower Estuary.6. In contrast, during the 2 years with hunting westward movement was more than four times more likely than in preceding years. Most of these backward movements occurred shortly after the beginning of the hunt, indicating that geese moved back to regions where they had not previously experienced hunting.7. Overall disturbance level increased in all regions in years with hunting relative to years without hunting.8. Synthesis and applications. We conclude that spring hunting changed the stopover scheduling of this long-distance migrant and might further impact population dynamics by reducing prenuptial fattening. The spring hunt may also have increased crop damage. We propose that staggered hunt opening dates could attenuate secondary effects of such management actions.