We have maintained pupfish derived from a refuge population of the critically endangered Devils Hole pupfish (Cyprinodon diabolis) and the closely related and endangered Ash Meadows pupfish (C. nevadensis mionectes) in our laboratory for 9 years at the ecologically relevant temperatures of 28 and 33 °C. We asked if insights gained by our captive husbandry could inform on what pressures may be impacting the conservation of these fishes in the wild. Breeding is affected by temperature such that few eggs are deposited by fishes maintained at 33 °C. Fish acclimated to either 28 or 33 °C prefer 28 °C suggesting native habitats such as Devils Hole are not optimal for the fish. In addition to temperature, we found that providing cover in the form of aquarium plants and carpet squares increased egg deposition and larval survival presumably due to reduced oophagy and cannibalism of newly hatched larvae. The decline of the native population of C. diabolis coincided with a change in the algal community of Devils Hole from mats of green algae to sheet forming cyanobacteria. Our experiments suggest this lack of cover resulted in oophagy and cannibalism that reduced the reproductive capacity of Devils Hole pupfish. We suggest efforts at restoring cover in Devils Hole will have the greatest impact on enhancing survivorship of this species especially in light of the reduced breeding opportunities that will likely result from continuing global climate change.
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This work was supported by grants from the US National Park Service, US Fish and Wildlife Service, the Nevada Department of Wildlife and a Faculty Opportunity Award from University of Nevada Las Vegas. FvB is supported by the National Science Foundation IOS 1655091.
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Burg, G.C., Johnson, J., Spataro, S. et al. Care and propagation of captive pupfish from the genus Cyprinodon: insight into conservation. Environ Biol Fish 102, 1015–1024 (2019). https://doi.org/10.1007/s10641-019-00887-2
- Temperature effects
- Thermal preference