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首页> 外文期刊>Bird conservation international >Factors influencing the distribution and abundance of endemic pigeons on Sao Tome Island (Gulf of Guinea)
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Factors influencing the distribution and abundance of endemic pigeons on Sao Tome Island (Gulf of Guinea)

机译：影响圣多美岛（几内亚湾）上特有鸽子的分布和数量的因素

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Understanding the factors that determine habitat use and abundance of exploited species is essential to develop effective conservation strategies. We studied the four forest pigeons on Sao Tome Island to assess the species' distribution and abundance patterns. We determined ecological factors likely to be associated with each species' use of habitats and numbers, as well as the influence of hunting pressure. In total, 35 km of line transects were surveyed in the rainy season and at the start of the dry season. Pigeons differed in their use of habitats; there were also strong seasonality effects. The most abundant species was the Lemon Dove Columba simplex, the only non-hunted species. The Sao Tome Green Pigeon Treron sanctithomae and Maroon Pigeon Columba thomensis were less abundant and had more restricted ranges. Both species were strongly associated with old-growth forests. In contrast, the Bronze-naped Pigeon Columba malherbii was relatively abundant and widespread; this species favours human-altered habitats such as shade forests and non-forested areas. Fruit availability measured within the different habitats was linked with the distribution and abundance of the three hunted species. Potential human predation pressure on all species was determined from hunting signs found along the surveyed transects. There was a significant negative correlation between the abundance of two of the hunted species and hunting pressure. Our results indicate the importance of adequately protecting old-growth and secondary forests as core habitats for the survival of viable populations of all pigeon species in the island. However, control of hunting is also crucial.
机译：了解决定生境使用和被开发物种数量的因素对于开发有效的保护策略至关重要。我们研究了圣多美岛上的四只森林鸽子，以评估该物种的分布和丰度模式。我们确定了可能与每个物种的栖息地和数量使用有关的生态因素，以及狩猎压力的影响。在雨季和旱季开始时，总共调查了35公里的线样线。鸽子对栖息地的使用有所不同。还有强烈的季节性影响。最丰富的物种是柠檬鸽子“哥伦巴”，这是唯一未发现的物种。圣多美绿色鸽子Treron sanctithomae和栗色鸽子Columba thomensis的数量较少，范围受限制。这两个物种都与古老的森林密切相关。相比之下，青铜幼鸽“哥伦布·马尔赫比”相对丰富和广泛。该物种有利于人类改变的栖息地，例如遮荫森林和非森林地区。在不同生境中测得的水果供应量与三个被捕猎物种的分布和丰度有关。根据沿调查的样带发现的狩猎迹象，可以确定所有物种的潜在人类捕食压力。在两个被捕猎物种的丰度与猎杀压力之间存在显着的负相关。我们的研究结果表明，充分保护作为主要栖息地的旧林和次生林对于岛上所有鸽子物种的生存种群的生存至关重要。但是，控制狩猎也至关重要。

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