Evaluating extinction debt in fragmented forests: the rapid recovery of a critically endangered primate,Animal Conservation

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Evaluating extinction debt in fragmented forests: the rapid recovery of a critically endangered primate
Animal Conservation ( IF 2.8 ) Pub Date : 2020-10-04 , DOI: 10.1111/acv.12648
M. Alcocer‐Rodríguez ₁ , V. Arroyo‐Rodríguez ₂ , C. Galán‐Acedo ₂ , J. Cristóbal‐Azkarate ₃ , N. Asensio ₄ , K. F. Rito ₂ , J. E. Hawes _{5,

6} , J. J. Veà ₁ , Jacob C. Dunn _{5,

7,

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Affiliation

Fragmented tropical forests can be highly dynamic, with the spatial configuration of forest patches changing through time. Yet, the lack of longitudinal studies limits our understanding of how patch dynamics affect biodiversity, especially when there is a time lag in species extinctions (extinction debt). We assessed how temporal changes in patch size, shape complexity and isolation affect populations of the Mexican howler monkey (Alouatta palliata mexicana), hypothesizing that we would find an extinction debt in this relatively long-lived species. We assessed patch occupancy, subpopulation size and immature-to-female ratio in 39 forest patches from Los Tuxtlas, Mexico, in both 2001 and 2013. To identify time-lag responses to habitat disturbance, we related demographic attributes in 2013 to patch metrics in 2001 and 2013 and tested whether primate subpopulations were better predicted by current or historical patch characteristics. We also assessed how changes in patch metrics affected each demographic attribute between 2001 and 2013. Patch size and shape complexity increased over time, whereas isolation decreased. These positive spatial changes were accompanied by a 1.6-fold increase in mean subpopulation size over the same period. In addition, occupancy and immature-to-female ratio were similarly related to patch attributes in both years, suggesting that there is no extinction debt. Our findings are ‘good news’, suggesting that forest recovery over a relatively short period can promote the recovery of this Critically Endangered taxon. They also highlight the importance of preventing forest loss and promoting forest regeneration in human-modified tropical landscapes.

中文翻译：

评估支离破碎的森林中的灭绝债务：极度濒危灵长类动物的快速恢复

破碎的热带森林可能是高度动态的，森林斑块的空间配置随时间而变化。然而，纵向研究的缺乏限制了我们对斑块动态如何影响生物多样性的理解，尤其是当物种灭绝（灭绝债）存在时间滞后时。我们评估了斑块大小、形状复杂性和隔离性的时间变化如何影响墨西哥吼猴（Alouatta palliata mexicana)，假设我们会在这个相对长寿的物种中发现灭绝债务。我们评估了 2001 年和 2013 年墨西哥 Los Tuxtlas 的 39 个森林斑块的斑块占有率、亚种群大小和未成熟雌雄比例。为了确定对栖息地干扰的时滞响应，我们将 2013 年的人口统计属性与斑块指标相关联2001 年和 2013 年，并测试了当前或历史斑块特征是否能更好地预测灵长类动物亚群。我们还评估了 2001 年至 2013 年间补丁指标的变化如何影响每个人口统计属性。补丁大小和形状复杂性随着时间的推移而增加，而隔离度则下降。这些积极的空间变化伴随着同期平均亚群大小增加了 1.6 倍。此外，入住率和未成熟女性比例在这两年都与补丁属性类似，表明没有灭绝债务。我们的发现是“好消息”，表明在相对较短的时间内森林恢复可以促进这种极度濒危分类群的恢复。他们还强调了在人为改造的热带景观中防止森林流失和促进森林再生的重要性。

更新日期：2020-10-04

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