Our data on 103 field-collected toads (53 of which contained lungworms) support this prediction. Exercise induced a greater increase in heartbeat rate in infected toads than in uninfected conspecifics, but no shift in oxygen saturation of the haemoglobin. “
“Rostral appendages occur in a very small number of species spread across the entire clade of iguanian lizards. The five species of Sri Lankan agamid lizards of the poorly known endemic genus Ceratophora show
remarkable variation in the morphology and development of rostral appendages, which are absent in two species and present in the other three. Parsimony and Bayesian comparative methods do not robustly resolve whether the appendage evolved once (with two losses), twice (with one loss) or thrice independently. The appendage in C. tennentii is leaf-shaped, present in juveniles and monomorphic in adults. It is Pexidartinib mouse Small molecule library chemical structure quite dissimilar to the appendages in C. aspera and C. stoddartii which are horn-shaped, absent in juveniles and dimorphic in adults. Ceratophora stoddartii is more closely related to C. erdeleni, which
lacks the rostral appendage, than it is to C. aspera. The combined morphological, allometric and phylogenetic evidence suggests rostral appendages evolved three times within Ceratophora: perhaps once as a result of natural selection for crypsis (in C. tennentii) and twice as a result of sexual selection (in C. aspera and C. stoddartii). Our results suggest that these unusual ornaments can evolve by more than
one mechanism and more readily than is suggested by their low frequency among iguanian lizards. “
“Activity and behavior patterns are important 17-DMAG (Alvespimycin) HCl components of a given species’ ecological strategy, as they have profound implications for its survival and reproduction. Here, we studied the activities, movements and secretive behavior of the thin-spined porcupine Chaetomys subspinosus (Rodentia: Erethizontidae), a threatened arboreal folivore in the Brazilian Atlantic rainforest. We aimed to ascertain the behavioral strategies used by this species as well as its responses to seasonal and daily climatic changes. Four radio-collared individuals were followed continuously for 72-h in the summer and winter, as well as during 146 half-night sessions conducted from April 2005 to September 2006 in forest remnants in southern Bahia. The thin-spined porcupines were nocturnally active (17:30–05:40 h), with peaks in activity and movement from 19:00 to 20:00 h and 03:00 to 04:00 h. Animals followed a circadian rhythm of activity during both the summer and winter. During the diel cycle, porcupines spent 74% of their time resting, 14% feeding, 11% traveling and 2% performing other activities. Distance traveled during the diel cycle averaged 277.5 ± 117.9 m sd. The mean movement rate during the night was 21.6 ± 30.1 m/h sd.