Aquatic fauna of the northern Chihuahuan Desert : contributed papers from a special session within the Thirty-Third Annual Symposium of the Desert Fishes Council /

Garrett, Gary P.; Allan, Nathan

doi:10.5962/bhl.title.156444

Cited by 2 publications

(2 citation statements)

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“…Lowering dissolved oxygen levels suggest increasing spring‐influence (Brown, Lang & Perez, 2008) and G. desperatus tend to be found in the immediate vicinity of spring‐vents where dissolved oxygen is lowest (USFWS, 2011). Although they have not yet colonized the Rio Hondo midstream, the dissolved oxygen levels observed in this area are well within the ranges associated with G. desperatus (Lang et al, 2003). Salinities observed in the area, however, are slightly higher than the ambient salinities typically associated with G. desperatus (Seidel, Lang & Berg, 2010), but well below the short‐term tolerance threshold known to induce mortality (Seidel, Lang & Berg, 2010).…”

Section: Discussionsupporting

confidence: 61%

“…Apart from salinity during winter and water depth during summer, water quality variables in the Rio Hondo spring system were similar to reference areas. Salinity values during winter appear to be slightly higher than those previously reported (ambient conditions) for the three species (Lang et al, 2003; Macanowicz, Boeing & Gould, 2013; USFWS, 2019). However, comparison of water variables across studies is problematic, as the seasonal timing of data collection varies greatly across studies.…”

Section: Discussioncontrasting

confidence: 54%

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Successful establishment of endangered springsnails following habitat enhancement and translocations

Johnson

Beauchamp

Butler

et al. 2022

Aquatic Conservation

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1. Spring-associated aquatic invertebrates tend to be narrow-range endemics.Globally, they are threatened with extinction as a result of habitat loss caused by declining aquifers and by climate change.2. Extinction risks to narrow-range endemics may be reduced by having multiple, separate populations, yet there have been few attempts to use conservation translocations to create new populations.3. Pyrgulopsis roswellensis (Roswell springsnail), Juturnia kosteri (Koster's springsnail) and Gammarus desperatus (Noel's amphipod) are range-restricted, springassociated endangered species. Each species has lost one or more populations owing to habitat loss, and their distributions are now largely restricted to Bitter Lake National Wildlife Refuge, New Mexico. 4. In 2014, Bitter Lake National Wildlife Refuge enhanced a series of springs by rerouting a channelized section of river away from them. The goal was to create habitat suitable for establishing new populations of P. roswellensis and J. kosteri, and for expansion of G. desperatus. After assessing risks and benefits of translocations, approximately 6,177 P. roswellensis and 8,707 J. kosteri were introduced into the project area from 2015 to 2018. 5. Efficacy was evaluated by comparing the abundance of invertebrates in the translocation site through time, and by comparing springsnail abundance with three reference spring systems. From 2014 to 2021, invertebrates were monitored twice annually in the translocation area. In reference spring systems, P. roswellensis and J. kosteri were monitored twice annually in 2020 and 2021.6. Counts of springsnails in the translocation area were comparable to one or more reference areas, which suggests that translocations were successful. In addition, the proportion of P. roswellensis, the less common springsnail, to J. kosteri was similar to references areas. 7. G. desperatus did not increase, which may be because some measures of water quality have not stabilized. 8. Globally, climate change and aquifer declines necessitate immediate consideration be given to conservation translocations as a means of keeping spring-associated species from becoming extinct.

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