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These are essential tools for supporting wildlife conservation plans, being applicable for rare species whose biology and ecology remain unknown. Pablo Medrano-Vizcaíno, Patricia Gutiérrez-Salazar.Introduction Pulse pressure variation (PPV) has been shown to be useful to predict fluid responsiveness in patients ventilated at tidal volume (Vt) 8 mL kg-1. Nevertheless, most conditions in critical care force to use lower Vt. Thus, we sought to evaluate the operative performance of PPV when a Vt ⩽8 mL kg-1 is used during mechanical ve