Carvalho João, Granados José E, López-Olvera Jorge R, Cano-Manuel Francisco Javier, Pérez Jesús M, Fandos Paulino, Soriguer Ramón C, Velarde Roser, Fonseca Carlos, Ráez Arian, Espinosa José, Pettorelli Nathalie, Serrano Emmanuel
Centro de Estudos do Ambiente e do Mar (CESAM), Departamento de Biologia, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal.
Servei d'Ecopatologia de Fauna Salvatge (SEFaS), Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Barcelona, Spain.
Parasit Vectors. 2015 Nov 6;8:572. doi: 10.1186/s13071-015-1188-4.
Both parasitic load and resource availability can impact individual fitness, yet little is known about the interplay between these parameters in shaping body condition, a key determinant of fitness in wild mammals inhabiting seasonal environments.
Using partial least square regressions (PLSR), we explored how temporal variation in climatic conditions, vegetation dynamics and sarcoptic mange (Sarcoptes scabiei) severity impacted body condition of 473 Iberian ibexes (Capra pyrenaica) harvested between 1995 and 2008 in the highly seasonal Alpine ecosystem of Sierra Nevada Natural Space (SNNS), southern Spain.
Bottom-up regulation was found to only occur in healthy ibexes; the condition of infected ibexes was independent of primary productivity and snow cover. No link between ibex abundance and ibex body condition could be established when only considering infected individuals.
The pernicious effects of mange on Iberian ibexes overcome the benefits of favorable environmental conditions. Even though the increase in primary production exerts a positive effect on the body condition of healthy ibexes, the scabietic individuals do not derive any advantage from increased resource availability. Further applied research coupled with continuous sanitary surveillance are needed to address remaining knowledge gaps associated with the transmission dynamics and management of sarcoptic mange in free-living populations.
寄生虫负荷和资源可利用性都会影响个体健康状况，但对于这些参数在塑造身体状况（这是栖息于季节性环境中的野生哺乳动物健康状况的关键决定因素）方面的相互作用，我们知之甚少。
我们使用偏最小二乘回归（PLSR），探究了1995年至2008年间在西班牙南部内华达山脉自然空间（SNNS）高度季节性的高山生态系统中捕获的473只伊比利亚野山羊（Capra pyrenaica）的身体状况，是如何受到气候条件的时间变化、植被动态和疥螨病（Sarcoptes scabiei）严重程度的影响的。
发现自下而上的调节仅发生在健康的野山羊身上；受感染野山羊的身体状况与初级生产力和积雪无关。仅考虑受感染个体时，无法确定野山羊数量与野山羊身体状况之间的联系。
疥螨病对伊比利亚野山羊的有害影响超过了有利环境条件带来的益处。尽管初级生产力的增加对健康野山羊的身体状况产生了积极影响，但患疥螨病的个体并未从资源可利用性的增加中获得任何优势。需要进一步开展应用研究并持续进行卫生监测，以填补与自由生活种群中疥螨病传播动态和管理相关的现有知识空白。
