A newly published, peer-reviewed analysis used environmental rangers’ in Spain historical observations to reconstruct the mongoose’s spread. Estimated occupancy rose from 6.8% to 24.6% of municipalities across study periods spanning 2000–2018. The model includes the possibility of animals escaping detection and links colonisation with warmer, scrub-covered places near areas already occupied; it does not count individual animals.
The Egyptian mongoose occupied an increasing share of central Spanish municipalities during 2000–2018, according to a newly published peer-reviewed reconstruction. In Castilla-La Mancha, a region of central Spain, modelled occupancy rose from 6.8% in the earliest study period to 24.6% in the latest. The measure describes places where this carnivore was estimated to occur. It is distinct from a count of animals or the current extent of its range.[1]
The evidence came from a questionnaire answered by 308 environmental rangers in 2019. Their territories encompassed 93.9% of regional land; municipal coverage was 91.6%. A dynamic occupancy model used separate periods for 2000–2009, 2010–2015 and 2016–2018. It allowed the animal to be present without being seen. Rangers spending more of their work time outdoors were more likely to detect it, a difference incorporated into the estimates.[1]
Warmer municipalities, more scrub cover and proximity to already occupied places were associated with colonisation. These relationships do not establish one cause of expansion. The Iberian Peninsula is part of the mongoose’s native range. Long, unequal observation periods and retrospective memory complicate the estimated magnitude: occupancy may have changed within a period. Participation was also lower in eastern areas where the mongoose had historically been absent, adding a geographic imbalance to the questionnaire evidence.[1]
