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Assessing Preservation Priorities of Caves and Karst Areas Using the Frequency of Endemic Cave-Dwelling Species” by Nitzu Et Al

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Assessing Preservation Priorities of Caves and Karst Areas Using the Frequency of Endemic Cave-Dwelling Species” by Nitzu Et Al International Journal of Speleology 48 (1) 107-109 Tampa, FL (USA) January 2019 Available online at scholarcommons.usf.edu/ijs International Journal of Speleology Off icial Journal of Union Internationale de Spéléologie Comment on “Assessing preservation priorities of caves and karst areas using the frequency of endemic cave-dwelling species” by Nitzu et al. (2018), Int. J. Speleol., 47 (1): 43-52 Oana T. Moldovan and Traian Brad* “Emil Racoviţă” Institute of Speleology, Romanian Academy, Clinicilor 5, Cluj-Napoca, Romania Keywords: cave fauna, endemism, database, protection, red list Received 6 December 2018; Revised 13 February 2019; Accepted 13 February 2019 Citation: Moldovan O.T. and Brad T., 2019. Comment on "Assessing preservation priorities of caves and karst areas using the frequency of endemic cave-dwelling species" by Nitzu et al. (2018), Int. J. Speleol., 47 (1): 43-52. International Journal of Speleology, 48 (1), 107-109. Tampa, FL (USA) ISSN 0392-6672 https://doi.org/10.5038/1827-806X.48.1.2241 In a recent paper published by Nitzu et al. (2018), the with many others that might be biospeleologically authors propose an algorithm to identify “hotspots of overlooked. In order to be certain that a species is vulnerable karst areas” that uses frequency of endemic present in one or more caves, repeated sampling is “cave-dwelling species”. The authors viewpoint is needed. Moldovan et al. (2012) have shown the large that the occurrence of endemic troglobionts and heterogeneity of stygobiontic fauna in caves, where stygobionts, or cave-dwelling species as given in the some species were collected only once during several title, in 3-4 caves up to a maximum of 37 caves, can months in a single drip/pool inside a cave. be used to rank caves in terms of their vulnerability. The proposed ranking is based on a published list of Type II error: assuming that the list of ranked endemic species that can be found in Romanian caves caves is based on strictly regional endemic species. (Nitzu et al., 2016). We discuss here the type of errors The list published by Nitzu et al. in 2016 has many that encumber the correct and equitable protection of examples of troglophilic species that are not even cave species and their habitat, which can derive from endemic at national level. For example, Trachelipus the use of quantitative criteria based on incomplete trilobatus is a troglophile isopod also mentioned from or incorrect datasets on cave fauna (troglobionts and Poland and Orthonychiurus ancae is a troglophile stygobionts). also present in Slovenia (de Jong et al., 2014). There are also troglophilic species with wide distribution in Type I error: assuming that the quantitative Romania. For example, Hyloniscus flammuloides is ranking of caves is based on a complete and correct distributed in two different mountain massifs of the inventory of cave species. The incomplete number Southern Carpathians with possible more extensive of species is prone to inevitable errors (species present distribution (Tabacaru & Giurginca, 2013). but not found or not published, incomplete databases Niphargus “ablaskiri variabilis” (correct N. variabilis) etc.), which would place the caves with important is not endemic to only some particular caves, but species or communities at low ranks. In the list of present in the Bihor, Vâlcan and ureanu Mountains Nitzu et al. (2016), notorious examples of missing data (Apuseni Mountains and Southern Carpathians, are apparent. For example, in Pe tera (Cave) Vântului respectively). N. bihorensis is alsoȘ present in several only six species are mentioned, while this cave is one other caves in the Apuseni Mountains, and not only of the richest in Romania with respectș to cave fauna, in Meziad Cave (Dobreanu & Manolache, 1957). “N. containing twelve troglobionts and stygobionts, some stygocharis stygocharis” (correct N. stygocharis) is of them strictly endemic to this cave. As a result, present in Pe tera de la Vadu Cri ului, but also in the Pe tera Vântului is not considered as one of the hyporheic environment of the Cri ul Repede River and vulnerable caves. Pe tera Lazului, one of the richest in several drinkingș water wells alongș this river. in șcave fauna with eight troglobitic and two stygobitic We argue that endemic speciesș should be only species, is also under-ranked.ș considered when isolated populations are present in Out of more than 12,000 caves known in Romania, specific areas characterized by particular geological 830 are considered in Nitzu et al. (2016, 2018), and geographical features. When a species is present *[email protected] The author’s rights are protected under a Creative Commons Attribution- NonCommercial 4.0 International (CC BY-NC 4.0) license. 108 Moldovan and Brad in a larger territory such as that of a ~250.000-km2 Type VI error: ignoring the potential threats to cave country, with such a heterogeneous landscape, then fauna. By ranking caves that are highly vulnerable to the species can no longer be considered a regional anthropic impacts at low levels based on quantitative endemism. data is as dangerous as declaring the caves free to any usage. Although Nitzu et al. (2018) promised to add Type III error: assuming that troglobionts and other criteria to cave ranking, we consider that one troglophiles are equal in setting protection cannot start prioritizing caves for protection based priorities. Considering that caves can be ranked solely on the number of species and their frequency by using troglophilic species means prioritizing the and ignoring the actual threats. Many strategies of protection of cave fauna by way of adding species that caves protection also include the possible or existent also use surface habitats. We picked randomly from threats (e.g., Souza-Silva et al., 2015; Souza-Silva & the list (Nitzu et al., 2016) two examples of caves from Ferreira, 2016, and references in Nitzu et al., 2018). Southern Carpathians: Pe tera Piatra Scrisă, with two In Appendix 1 (Nitzu et al., 2018), 66 caves in Apuseni troglophile species and sharing the same ranking with Mountains and 103 caves in Southern Carpathians Pe tera Vacilor din Cheileș Orze tilor, which houses have a small endemicity index, leaving less than 19 one troglobiont and one troglophile. Similarly, Pe tera caves in Apuseni Mountains and 14 caves in Southern Piatraș Scrisă has a higher rankingș than Pe tera de Carpathians for protection. According to the same la Gălă eni, which has two troglobionts and ș one reasoning, none of the caves in Banat Mountains (one stygobiont, with one species being endemicș to this of the most important hot-spots for cave endemics in cave, orș higher than Pe tera din Pietrele Negru, with Romania) are in the red zone and require protection. one stygobiont and two troglobionts, one endemic to a The same stands for caves in Eastern Carpathians, few caves within a smallș area. which contain less endemic species and therefore do Troglophilic species might be mentioned in dozen not deserve much protection. Each of these mountain of caves, but there is no study on their presence ranges has cave genera and species that are endemic and abundance in surface and subsurface habitats. to one or a few caves in a small area. Troglophilic species can be found at the entrance of Today, one of the most important threats to caves any small cave or even sheltered under the rocks in Romania is the so-called ‘specialized speleological at the surface and their distribution is higher than tourism’ (literally translated from Romanian). This type estimated. of tourism involves the visiting of wild caves by groups of ordinary tourists that are provided with speleological Type IV error: assuming that frequency is a true equipment and a guide. The phenomenon is rapidly estimator of endemicity. Sampling in a few caves growing in Romania and affords access to hundreds of in one area is also subject to erroneous frequency people in a single day, even in highly protected caves estimation of a species distribution. For example, the with little or no control and without knowing that they ranking of a species found in 30 caves in an area of 10 may destroy some of the most important and unique km2 is the same as the ranking of a species found in habitats for rare cave species. This threat was ignored the same number of caves (30) in an area of 100 km2, by Nitzu et al. (2018). In Vântului Cave, which is where the other possible 300 caves with fauna were often visited during weekends by hundreds of people, not inspected. Ideally, sampling should be carried out eleven species out of a total of twelve were described in all caves in a relatively small area. On the contrary, only in the lower level of the cave. This is exactly the it becomes more difficult to estimate the presence/ place where the access for speleological tourism was absence of species in larger areas, where the number granted, assuming incorrectly that the cave fauna can of caves can be higher and nearly impossible to be be found also in the upper levels, which is not the case. entirely sampled. Type VII error: ignoring the legislation in force Type V error: ignoring species that should be on a that protects cave habitats or cave species. The red list of Romanian cave species. Some species are idea of prioritizing caves based on species number can known to be very rare in caves, even when repeated lead to unnecessary protection for caves that are not sampling attempts are made, while other species under threat, and to insufficient protection for caves form big populations in caves. Even if caves are not that have not been studied enough and where rare the unique habitat for the cave animals, they are species may live.
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