02282nas a2200133   4500008004100000245011200041210006900153520178900222100002402011700002402035700002402059700002502083856004002108       2021                        eng d00aBehavioral differences in sound detection in recently diverged cave and surface forms of Astyanax mexicanus0 aBehavioral differences in sound detection in recently diverged c3 a<p>Astyanax mexicanus, or the Mexican tetra, inhabits both surface streams and cave systems, and has subsequently developed two unique morphologies: a cave morph and a surface morph. Cave morphs of the species have evolved several troglomorphic phenotypes, including vestigial eyes, reduced pigmentation, and increased olfactory and lateral line sensitivity. Interestingly, several satellite populations of surface fish were introduced to a Texas aquifer approximately 100 years ago and, following cave colonization, rapid evolution of various sensory adaptations between the cave and surface populations have been observed. Auditory evoked potential (AEP) data was collected to compare hearing sensitivities between cave and surface satellite populations, and both populations responded to sound presentation up to 4 kHz. However, because AEPs measure action potential summation to screen for frequency sensitivities, behavioral data is needed to determine absolute hearing sensitivity. The current study examines behavioral differences in sound detection between these two populations using reflexive startle behaviors to sound, namely the &ldquo;C-start&rdquo; escape response, which has been shown to be a reliable means of determining neurological responses to acoustic stimuli. Based on behavioral audiograms collected on satellite three populations, San Pedro Springs (cave) and Honey Creek (surface) appear to respond more readily to acoustic stimuli and habituate at a similar rate when compared to San Antonio Zoo (surface), which appear to respond less readily and habituate faster. Differences in sound pressure thresholds, as well as stimulus-response latencies between these populations, will be determined through finer volume control and modeling sub-thresholds.</p>
1 aKistner, Amanda, R.1 aEnriquez, Maya, S .1 aMichels, Noland, O.1 aMensinger, Allen, F.  uhttps://hdl.handle.net/11299/22473202430nas a2200265   4500008004100000022001400041245012500055210006900180260001600249520154900265653002401814653001101838653001401849653001901863653002501882653003101907100002601938700002401964700002901988700002802017700002702045700001802072700001902090856005502109       2018                        eng d  a0289-077100aEffects of hydroelectric turbine noise on the behaviour of Leporinus taeniatus (Characiformes: Anostomidae) in captivity0 aEffects of hydroelectric turbine noise on the behaviour of Lepor  cOct-11-20193 a<p>Hydroelectric power plants (HPP) constitute one of the main forms of energy generation in the world, and its operation produces underwater noise through generators and turbines, which can potentially impact the aquatic fauna. Anthropogenic noise is a stressful factor and can affect behaviour, physiology and acoustic communication of many animal species. However, the noise impact produced by HPP on fishes has not been studied yet. In this research we investigated the noise impact of hydroelectric turbines on the behaviour of Leporinus taeniatus held captive in Brazil. We tested the hypothesis that noise could disturb fishes&rsquo; behaviour by affecting school organization, fish position in the tank and the speed of swimming. Two groups of 10 individuals were exposed to 30 sessions of noise played at an intensity of 100 dB re 1 &micro;Pa, during 40 s on days 0, 7 and 14. Behavioural data were obtained before, during, and after noise exposure. Results showed that the fish swam significantly faster, moving to the bottom and swimming in depolarised shoals during noise exposure in both groups. Temporal analysis showed that during noise exposure fish swam faster, were less stationary and used the bottom of the tanks more throughout sampling period. These data provide evidence that fish behaviour can be affected by the aversive stimulus of the noise of a hydroelectric turbine in operation. It also suggests that sound pollution issues should be taken into consideration when regulating the use of natural areas for HPP.</p>
10aanthropogenic noise10aBrazil10aCharacins10aFish behaviour10aHydroelectric impact10aSão Francisco River basin1 aDuarte, Marina, H. L.1 aMelo, Rafael, M. C.1 aScarpelli, Marina, D. A.1 aCarvalho, Thiago, M. A.1 aPadovese, Linilson, R.1 aBazzoli, Nilo1 aRizzo, Elizete  uhttp://link.springer.com/10.1007/s10164-018-0568-6