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Parasite loads and altitudinal distribution of Liolaemus lizards in the central Chilean Andes RChHN
CAROTHERS,JOHN H.; JAKSIC,FABIÁN M..
This study compared the distributions of ten species of Liolaemus lizards in the central Chilean Andes to the distributions of four types of parasites: malaria-causing Plasmodium, gut nematodes, ticks, and mites. We wanted to see if parasite numbers might be a factor in determining distributional limits of the lizards. We found that there was no evidence of malarial infestation of the lizards, that ticks were almost absent, that more often than not mite numbers decreased at the distributional limits of the lizards, and that gut nematodes confined to the herbivorous lizards in our sample may well be beneficial rather than detrimental. Rather than parasitism, other biotic interactions (e.g., predation or competition) are more likely candidates as factors...
Tipo: Journal article Palavras-chave: Malaria; Plasmodium; Gut nematodes; Ticks; Mites; Chile; Altitudinal gradient.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300013
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Altitudinal zonation among lizards of the genus Liolaemus: questions answered and unanswered questions RChHN
CAROTHERS,JOHN H.; JAKSIC,FABIÁN M.; MARQUET,PABLO A..
We review factors influencing Liolaemus distributions in the central Chilean Andes and suggest areas of future research. Our previous studies reveal that lizard parasites (ectoparasitic mites and ticks, and the endoparasite Plasmodium) do not set Liolaemus altitudinal limits. Thermal tolerances do not appear to limit altitudinal distributions, although cold ambient temperatures dictate that only live-bearing species can occur above 2,400 m elevation. Three Liolaemus species specialize on elevationally restricted microhabitats. Liolaemus tenuis is found exclusively in or at the base of trees, which are typically below 1,800 m. Liolaemus leopardinus specializes on large rocky outcrops found at high altitudes. Liolaemus monticola uses smaller rocks: oviparity...
Tipo: Journal article Palavras-chave: Altitudinal gradient; Central Chile; Species distribution; Thermal biology; Parasite load; Microhabitat preference; Interspecific competition.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200008
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