Cave colonization without fasting capacities: an example with the fish Astyanax fasciatus mexicanus.

摘要: Subterranean animals have commonly evolved hypoactivity, hypometabolism and/or the sequential use of energetic reserves to tolerate long fasting periods imposed by low food levels found in subterranean environments. However, some tropical caves are characterized a potential high level nutriments. By using fish Astyanax fasciatus that presents both populations (Astyanax mexicanus) and epigean fasciatus) populations, we described behavioral, metabolic biochemical responses during long-term period followed refeeding period. The results demonstrated fed hypogean fishes exhibited different energy stores together with hypometabolism. But, despite drastic decreases locomotory activity oxygen consumption fasting, consumed significantly more glycogen, triglycerides proteins starvation than fishes. This lower capacity showed is confirmed higher activation compensatory pathways (ketogenesis gluconeogenesis). After period, cave did not recover from “food deprivation” stress, resume triglyceride proteins, contrast ones. study thus demonstrates adaptations necessary for life, but rather correlated “energetic state” each ecosystem, troglomorphism linked capacities impoverished availability.