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Conservation status of the threatened and endemic Rufous-throated Dipper Cinclus schulzi in Argentina
Bird Conservation International ( IF 1.6 ) Pub Date : 2019-12-09 , DOI: 10.1017/s0959270919000467 NATALIA POLITI , SEBASTIÁN MARTINUZZI , PATRICIA SARDINA ARAGÓN , VERÓNICA MIRANDA , SEBASTIÁN ALBANESI , PATRICIA PUECHAGUT , VOLKER C. RADELOFF , ANNA PIDGEON , LUIS RIVERA
Bird Conservation International ( IF 1.6 ) Pub Date : 2019-12-09 , DOI: 10.1017/s0959270919000467 NATALIA POLITI , SEBASTIÁN MARTINUZZI , PATRICIA SARDINA ARAGÓN , VERÓNICA MIRANDA , SEBASTIÁN ALBANESI , PATRICIA PUECHAGUT , VOLKER C. RADELOFF , ANNA PIDGEON , LUIS RIVERA
SummaryThe Rufous-throated Dipper Cinclus schulzi is endemic to the Southern Yungas of north-western Argentina and southern Bolivia. The species is categorised as ‘Vulnerable’ on the IUCN Red List on the basis of small population size and restricted range. The purpose of our study was to determine the distribution of potentially suitable habitat for the Rufous-throated Dipper, estimate its population size, and assess potential distribution within strict protected areas, in north-western Argentina. We surveyed 44 rivers in the Southern Yungas of Argentina from 2010 to 2013 to determine dipper density (i.e. the number of individuals detected per km surveyed). The dipper’s potential distribution was assessed using a maximum entropy modeling approach based on 31 occurrence points and eight bioclimatic and two topographic variables as predictors. The species is dependent on mountain forest rivers, so the potential distribution was restricted to rivers. We estimated dipper population size by multiplying density by the potential distribution along rivers. Finally, we calculated the extent of suitable habitat contained within the boundaries of Argentina´s National Parks. Dipper density was 0.94 ± 1.55 individuals/km. We estimate that within north-west Argentina there are ~2,815 km of river that are potential habitat, with an area of occupancy of 141 km2 and a population size of 2,657 ± 4,355 dippers. However, of this river extent, less than 5% is within National Parks. Our results highlight the need to create new and to enlarge existing National Parks that protect the potentially suitable habitat of the species. Although more information is needed for Bolivia, the country-level area of occupancy and population size of the dipper found in Argentina provides strong evidence that the IUCN Red List classification of this species as ‘Vulnerable’ is warranted.
中文翻译:
阿根廷受威胁和地方性红喉北斗鱼的保护现状
摘要红喉北斗七星荸荠 是阿根廷西北部和玻利维亚南部南部永加斯的特有种。由于种群规模小,分布范围有限,该物种在 IUCN 红色名录中被归类为“易危”。我们研究的目的是确定可能适合红喉北斗七星栖息地的分布,估计其种群规模,并评估阿根廷西北部严格保护区内的潜在分布。我们从 2010 年到 2013 年调查了阿根廷南部永加斯的 44 条河流,以确定北斗鱼密度(即每公里调查发现的个体数量)。使用基于 31 个发生点和 8 个生物气候和两个地形变量作为预测因子的最大熵建模方法评估北斗七星的潜在分布。该物种依赖山区森林河流,因此潜在分布仅限于河流。我们通过将密度乘以沿河流的潜在分布来估计北斗鱼种群规模。最后,我们计算了阿根廷国家公园边界内适宜栖息地的范围。北斗星密度为 0.94 ± 1.55 个体/km。我们估计在阿根廷西北部有约 2,815 公里的河流是潜在的栖息地,占用面积为 141 公里2 人口规模为 2,657 ± 4,355 只杓型。然而,在这条河流范围内,只有不到 5% 位于国家公园内。我们的研究结果强调了建立新国家公园和扩大现有国家公园以保护该物种潜在适宜栖息地的必要性。尽管玻利维亚需要更多信息,但在阿根廷发现的北斗七星的国家级居住面积和种群规模提供了强有力的证据,证明 IUCN 红色名录将该物种列为“易危”是有必要的。
更新日期:2019-12-09
中文翻译:
阿根廷受威胁和地方性红喉北斗鱼的保护现状
摘要红喉北斗七星