Do the barrier islands of the Po Delta constitute an ecological trap for colonising Slender-billed Gulls Larus genei?

IF 0.4 Q4 ORNITHOLOGY
R. Valle, E. Verza, F. Scarton
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引用次数: 0

Abstract

Abstract The Slender-billed Gull (Larus genei) breeds with a scattered distribution on an extensive nesting area, ranging from India and Afghanistan in the East to the Iberian Peninsula in the West, including the Mediterranean and the Black Sea. A number of habitats are used for breeding, such as sand-spits and beaches along coasts and islands of land-locked seas, steppe lakes, but also brackish or freshwater lagoons near river deltas. Sea level rise dramatically affects coastal sites, thus being the greatest threat to the survival of many seabird species, including gulls. This note describes habitat selection, breeding success and causes of failure of Slender-billed Gulls during their colonisation of the northern Po Delta (NE Italy) during 2018–2022. Slender-billed Gulls colonised the northern Po Delta in 2018. Six colonies were found during the study period. Birds used both natural barrier islands and artificial dredge islands. Productivity in the first five years after the colonisation event was zero, mostly due to colony sites being flooded by high tides and storms. If Slender-billed Gulls will switch to nest in nearby fish farms, these could provide plenty of suitable breeding sites, safe from tidal flooding and with very low predation pressure, allowing sufficient productivity. At the moment, Slender-billed Gulls are unsuccessful in colonising the barrier islands of the Po Delta.
波三角洲的屏障岛屿是否构成了长嘴海鸥Larus genei的生态陷阱?
摘要瘦嘴鸥(Larus genei)繁殖时分散分布在广阔的筑巢区,从东部的印度和阿富汗到西部的伊比利亚半岛,包括地中海和黑海。许多栖息地被用于繁殖,如海岸和内陆岛屿上的沙嘴和海滩、草原湖泊,以及河流三角洲附近的半咸水或淡水泻湖。海平面上升极大地影响了沿海地区,因此对包括海鸥在内的许多海鸟物种的生存构成了最大威胁。本说明描述了2018年至2022年,瘦嘴鸥在北部波三角洲(意大利东北部)殖民期间的栖息地选择、繁殖成功和失败原因。2018年,瘦嘴海鸥在北部的蒲三角洲定居。在研究期间发现了六个菌落。鸟类既使用天然屏障岛,也使用人工疏浚岛。殖民事件后的前五年生产力为零,主要是由于殖民地被高潮和风暴淹没。如果瘦嘴鸥将在附近的渔场筑巢,这些渔场将提供大量合适的繁殖场所,免受潮汐洪水的影响,捕食压力非常低,从而获得足够的生产力。目前,瘦嘴海鸥在波三角洲的屏障岛屿上的殖民活动并不成功。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ornis Hungarica
Ornis Hungarica Agricultural and Biological Sciences-Animal Science and Zoology
CiteScore
0.90
自引率
0.00%
发文量
15
审稿时长
20 weeks
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