Browsing by Author "Marin, Juan C."

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    A conflict between a threatened deer and indigenous agriculture: Tarukas (Hippocamelus antisensis D'Orbigny) and Aymara farmers in northern Chile
    (EDICIONES UNIV, CONCEPCION, 2021) Munoz, Alejandra E.; Petitpas, Robert; Marin, Juan C.; Bonacic, Cristian
    The taruka is one of the least known deer species of the world. Its range includes the northern Andean mountains in Chile, where their relationship with Aymara peasants is conflictive because of crop raiding. The aim of this study is to understand the nature of this conflict in Chile, and identify socio-ecological features that may explain it. Data of different sampling dates from 2003 to 2011 of night transects on roads, crop examination, interviews and direct sighting of tarukas were used to understand its ecology and relationship with local peasants. Peasants interviewed (n=47) cultivated mainly corn (85.1%) and alfalfa (74.5%) in small farms and 83% of them raise livestock. The conflict is widespread in Parinacota Province, where tarukas effectively consume crops, mainly abandoned alfalfa at night. The occurrence of crop raiding is not positively correlated with dry season as expected. However crop consumption is low (10.3% average of damaged plants in crop plots). In Del Tamarugal Province only 29.4% of peasants manifested conflict with tarukas but they did report conflict with other ungulates. Day sightings showed 78 tarukas in 34 encounters during 59 days. Night surveys yielded 11.6 +/- 7.4 tarukas/survey, sighted only in alfalfa plots. Aymara agriculture feeds tarukas and is declining because of rural-urban migration. The conflict must be considered in the conservation strategy of the species.
  • No Thumbnail Available
    Item
    Mitochondrial DNA variation and systematics of the guanaco (Lama guanicoe, Artiodactyla: Camelidae)
    (2008) Marin, Juan C.; Spotorno, Angel E.; Gonzalez, Benito A.; Bonacic, Cristian; Wheeler, Jane C.; Casey, Ciara S.; Bruford, Michael W.; Palma, R. Eduardo; Poulin, Elie
    Guanacos (Lama guanicoe) are the most important native herbivorous species in the South American steppes and the dominant ungulate in a fauna rich in rodents but poor in large mammal species. Between 2 and 4 subspecies are usually recognized within Lama guanicoe, based on subtle morphological differences and geographic distribution. To evaluate whether molecular variation is consistent with the latter hypotheses, we analyzed the complete cytochrome-b and partial control region mitochondrial DNA sequences of L. guanicoe from 22 localities in Peru, Bolivia, Argentina, and Chile. Sequence analyses of both genes support the monophyly of the species but failed to distinguish the occurrence of subspecies along the geographic range. Despite that, the northernmost populations (Peru and northern Chile) showed some degree of genetic differentiation with respect to southern representatives from Argentina, Bolivia, and rest of Chile. Analysis of genetic diversity also showed a strong signal of past low population size and a recent population expansion.
  • Thumbnail Image
    Item
    Molecular divergence between insular and continental Pudu deer (Pudu puda) populations in the Chilean Patagonia
    (TAYLOR & FRANCIS LTD, 2011) Fuentes Hurtado, Marcelo; Marin, Juan C.; Gonzalez Acuna, Daniel; Verdugo, Claudio; Vidal, Fernando; Vianna, Juliana A.
    Island-continent isolation scenarios have played major roles in the understanding and development of evolutionary theories. During the last glacial maximum (LGM) in southern Chile, ice sheet advances and retreats formed the Patagonian archipelago along the southern Pacific Ocean. Chiloe Island is the largest island from the archipelago isolated from the continent by a narrow and shallow stretch of ocean. Pudu puda is a species endemic to Chile and part of Argentina, distributed along the Valdivian Temperate rainforest. We used mtDNA control region (654 bp) and cytochrome b (734 bp) sequences to understand the consequences in the evolutionary history and population structure of Pudu puda island-continent isolation. Bayesian and Maximum Likelihood phylogenetic analysis revealed two divergent clades corresponding to the continent and Chiloe Island. The Median Joining Network also supports these findings with an isolation of 10 mutational steps between Chiloe and the continent. We also found a significant high genetic structure (phi st = 0.75) and a sequence divergence percentage of 2.3% between the two clades. On the other hand, on the continent we found high haplotype genetic diversity (H = 0.9790 +/- 0.0103) but no clear geographical population structure or phylogenetic clades. Our results suggest that the southern Pudu deer populations were isolated since the interglacial period (less than 0.5 million years ago) from the continent leading to two reciprocally monophyletic clades. We propose two subspecies to be considered in the development of future conservation programs for the species.