INVESTIGADORES
NAVA Santiago
artículos
Título:
Divergent environmental preferences and areas of sympatry of tick species in the Amblyomma cajennense complex (Ixodidae).
Autor/es:
ESTRADA PEÑA A, TARRAGONA EL, VESCO U, DE MENEGHI D, MASTROPAOLO M, MANGOLD AJ, GUGLIELMONE AA, NAVA S.
Revista:
INTERNATIONAL JOURNAL FOR PARASITOLOGY
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 44 p. 1081 - 1089
ISSN:
0020-7519
Resumen:
Four species of Neotropical ticks, Amblyomma mixtum, Amblyomma cajennense, Amblyomma tonelliaeAmblyomma mixtum, Amblyomma cajennense, Amblyomma tonelliae
and Amblyomma sculptum (formerly included in the catch-all name A. cajennense), have an allopatric
distribution in much of their range, with areas of parapatry for at least two of them. We inferred the
abiotic niches of these organisms using coefficients of a harmonic regression of the temperature and
the Normalized Difference Vegetation Index (NDVI, reflecting plant stress) from remotely sensed data
from MODIS satellites with 0.05 spatial resolution. Combinations of coefficients describing the phenology
of these two variables pointed to divergent niche preferences, compatible with previous events of
vicariance among the species. Amblyomma cajennense has been recorded in areas with small variations
in temperature and NDVI. The remaining species were recorded in areas with large variations. The maximum
environmental niche overlap was 73.6% between A. mixtum and A. cajennense and 73.5% betweenAmblyomma sculptum (formerly included in the catch-all name A. cajennense), have an allopatric
distribution in much of their range, with areas of parapatry for at least two of them. We inferred the
abiotic niches of these organisms using coefficients of a harmonic regression of the temperature and
the Normalized Difference Vegetation Index (NDVI, reflecting plant stress) from remotely sensed data
from MODIS satellites with 0.05 spatial resolution. Combinations of coefficients describing the phenology
of these two variables pointed to divergent niche preferences, compatible with previous events of
vicariance among the species. Amblyomma cajennense has been recorded in areas with small variations
in temperature and NDVI. The remaining species were recorded in areas with large variations. The maximum
environmental niche overlap was 73.6% between A. mixtum and A. cajennense and 73.5% between spatial resolution. Combinations of coefficients describing the phenology
of these two variables pointed to divergent niche preferences, compatible with previous events of
vicariance among the species. Amblyomma cajennense has been recorded in areas with small variations
in temperature and NDVI. The remaining species were recorded in areas with large variations. The maximum
environmental niche overlap was 73.6% between A. mixtum and A. cajennense and 73.5% betweenAmblyomma cajennense has been recorded in areas with small variations
in temperature and NDVI. The remaining species were recorded in areas with large variations. The maximum
environmental niche overlap was 73.6% between A. mixtum and A. cajennense and 73.5% betweenA. mixtum and A. cajennense and 73.5% between
A. tonelliae and A. sculptum. Projecting these inferences on the geographical space revealed probable areas
of sympatry or parapatry between A. mixtum and A. cajennense or between A. tonelliae and A. sculptum, the
latter of which was confirmed with field collections. The A. sculptum distribution overlaps with that ofand A. sculptum. Projecting these inferences on the geographical space revealed probable areas
of sympatry or parapatry between A. mixtum and A. cajennense or between A. tonelliae and A. sculptum, the
latter of which was confirmed with field collections. The A. sculptum distribution overlaps with that ofA. mixtum and A. cajennense or between A. tonelliae and A. sculptum, the
latter of which was confirmed with field collections. The A. sculptum distribution overlaps with that ofA. sculptum distribution overlaps with that of
A. tonelliae in northern Argentina and Paraguay; parapatry occurs at one extreme of the conditions occupied
by both species. Compared with areas of allopatry, sites with both species had consistently lower
temperatures, except for 10?12 weeks during the summer, and higher NDVI values throughout the year.
We hypothesise that the overlap between A. tonelliae and A. sculptum resulted from secondary contact
between populations, with A. sculptum adapting to sites with high water availability to balance high
summer temperatures. Additional surveys of the areas of spatial overlap among these species are
necessary to elucidate the forces driving their evolution and their adaptation to the environment.in northern Argentina and Paraguay; parapatry occurs at one extreme of the conditions occupied
by both species. Compared with areas of allopatry, sites with both species had consistently lower
temperatures, except for 10?12 weeks during the summer, and higher NDVI values throughout the year.
We hypothesise that the overlap between A. tonelliae and A. sculptum resulted from secondary contact
between populations, with A. sculptum adapting to sites with high water availability to balance high
summer temperatures. Additional surveys of the areas of spatial overlap among these species are
necessary to elucidate the forces driving their evolution and their adaptation to the environment.A. tonelliae and A. sculptum resulted from secondary contact
between populations, with A. sculptum adapting to sites with high water availability to balance high
summer temperatures. Additional surveys of the areas of spatial overlap among these species are
necessary to elucidate the forces driving their evolution and their adaptation to the environment.A. sculptum adapting to sites with high water availability to balance high
summer temperatures. Additional surveys of the areas of spatial overlap among these species are
necessary to elucidate the forces driving their evolution and their adaptation to the environment.