Divergences in ecological niche dimensions favor the coexistence of species in syntopy. Supposedly, closely related species face stronger pressures to differ in dimensions of niches. Integration among temporal, spatial and thermal niche dimensions is relevant for lizards because it allows proper regulation of body temperatures, which has consequences for their physiology and ecology. Here, we investigated temporal (daily activity) and thermal (body and microhabitat temperatures) niche dimensions and thermoregulation of Tropidurus hispidus and T. semitaeniatus. We hypothesized that divergences of niche dimensions would favor their local coexistences (syntopy). Tropidurus hispidus and T. semitaeniatus had similar lengths of daily activity cycles, but differed in movement rates along the day (start of the activities; hours of activity peaks; periods of greater inactivity). Activity rates and body temperatures of the lizards reflected phylogeny and thermal conditions. For both species, microhabitat temperatures and sunlight were sources for thermoregulation. Tropidurus semitaeniatus used warmer microhabitats than T. hispidus, but the species had similar body temperatures. Body sizes did not influence body temperatures, presumably because of effective behavioral thermoregulation allowing maintenance of body temperatures under appropriate ranges. Levels of active or passive thermoregulation varied depending of the thermal source (air and substrate temperatures). To thermoregulate, lizards raised up or brought down their bodies and increased or decreased levels of body flattening over substrates and shuttled across microhabitats with different temperatures and levels of sunlight. Along the day, T. hispidus used mainly partially shaded microhabitats and T. semitaeniatus used mostly full sunlight. Temporal and thermal niche dimensions of T. hispidus and T. semitaeniatus differed in ways that favor their syntopy.

生态位维度上的差异有利于物种在共存中的共存。据推测，密切相关的物种面临着更大的压力，以改变生态位的大小。时空，空间和热生态位维度之间的集成与蜥蜴有关，因为它可以适当调节体温，这会对它们的生理和生态产生影响。在这里，我们调查了Tropidurus hispidus和T. semitaeniatus的时间（日常活动）和热（体温和微生境温度）的生态位尺寸和温度调节。我们假设，利基维度的差异将有利于它们的局部共存（同义词）。Tropidurus hispidus和T. semitaeniatus每天的活动周期长度相似，但一天中的运动速率有所不同（活动开始；活动高峰时间；不活动时间较长）。蜥蜴的活动率和体温反映了系统发育和热状况。对于这两个物种，微生境温度和阳光都是进行温度调节的来源。Tropidurus semitaeniatus使用比T. hispidus温暖的微生境，但该物种的体温相似。体型不影响体温，大概是因为有效的行为体温调节使体温维持在适当范围内。主动或被动温度调节的水平根据热源（空气和基材温度）而变化。为了进行温度调节，蜥蜴会升高或降低其身体，并增加或减少在基板上变平的身体水平，并在不同温度和阳光水平下穿梭于微栖息地。整天，hispidus主要使用部分阴影的微生境，而semitaeniatus则主要使用全阳光。T. hispidus和T. semitaeniatus的时间和热生态位维度 在支持它们对位的方式上有所不同。