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The rise of a carnivore, the evolution of the presence of the golden jackal in Slovakia.

Introduction

The golden jackal (Canis aureus Linnaeus, 1758) is a middle-sized carnivore from the genus Canis (Jhala & Moehlmann 2008, Krofel et al. 2017) and considered amongst wolf-like canids as a monophyletic species (Wayne et al. 1997, Bardeleben et al. 2005). Compared to other canid species, the golden jackal has one of the largest wide-range distributions amongst Europe and Asia (Moehlmann 1983, Sillero-Zubiri et al. 2004, Arnold et al. 2012, Rutkowski 2015). Due to their high adaptability in different landscapes, opportunistic predator behaviour and omnivorous diet, the golden jackal is expanding its territory range through Europe (Heltai et al. 2013, Krofel et al. 2017). Throughout its actual geographical range, this mesocarnivore occupies multiple habitats, from extreme deserts to dense forests (Krystufek & Tvrtkovic 1990, Krystufek et al. 1997, Giannatos 2004, Lapini et al. 2009, Arnold et al. 2012, Trouwborst et al. 2015, Krofel et al. 2017). The highest probability of observing this species is generally at crepuscular hours, but their activity pattern in places where they live near humans is mostly nocturnal (Ginsberg & Macdonald 1990, Patil & Jhala 2008). It is a social animal, found to live in monogamous pairs or in organized family groups, but can easily live as a solitaire vagrant in search for a suitable territory and a partner (Negi 2014).

Throughout their range, the population of the golden jackal declined until the 1960s due to habitat fragmentation, culling practices and intensive hunting persecutions. During the 1980's, number of golden jackals increased in the core area and from the end of the century the dispersion of the species increased towards the North and West of Europe (Krystufek & Tvrtkovic 1990, Krofel & Potocnik 2008, Lapini et al. 2009, Arnold et al. 2012, Trouwborst et al. 2015, Hatlauf et al. 2016, Ranc 2016). Some studies suggested that natural causes and anthropogenic influences as well as the presence of other top predators, especially stablished wolf packs, can influence their patterns of fast dispersion and establishment in new territories (Giannatos et al. 2005, Salek et al. 2014, Newsome et al. 2015, Trouwborst et al. 2015, Krofel et al. 2017). Nevertheless, the main reasons that can clearly justify this mesocarnivore release theory are still unclear. Known densities vary according to differences in habitat and mainly food availability, but there is little quantitative information along their full range (Sillero-Zubiri et al. 2004, Arnold et al. 2012, Hayward 2017).

Aiming to bring a clear notion about the definite situation of the golden jackal in Slovakia, we created a compilation of all official occurrences. The presence and establishment of the golden jackal can represent a great challenge for local authorities and decision makers (Trouwborst et al. 2015), due to their capacity for long-distance dispersion (Rutkowski et al. 2015) and the rapid growth of individuals in a very short period of time (Ivanov et al. 2016).

The results presented in this review represent crucial up-to-date information about past migration patterns, mortality data and actual distribution in the country. In addition, attempts will be made to provide a greater understanding of its distribution and expansion trends in order to support and guide future research of the golden jackal in Slovakia.

Material and Methods

We carried out an intensive analysis in official databases and we research available literature, to gather all certified data about golden jackals. Official records were collected from two governmental organisations, the State Nature Conservancy of the Slovak Republic (SNCSR)--www.biomonitoring.sk and the National Forest Centre (NFC)--www.forestportal.sk. The data from SNCSR is compiled in the CIMS--Complex Information and Monitoring System. This web database is specialised in online collection of data directly from various types of collectors. The NFC database, corresponding to the data gathered from all hunting grounds, mainly shot and observed individuals, is assembled annually and used in the production of the official hunting statistics. Literature research targeted scientific articles, non-published literature, websites from hunting groups, publications in hunting magazines and relevant personal communications.

Classification of collected evidence was done based on the assessment criteria from SCALP (Breitenmoser et al. 2006), adapted by GOJAGE (Hatlauf et al. 2016). Within this review, shot and found dead individuals were classified as C1 and registered observations as C3. We did not classify any evidence with the category of C2. Records that presented footprints and scats were not used for the assessment of the data. Data was divided in three specific temporal periods. The first dataset aimed to understand and identify the probable migration patterns, using the geographic locations of the data from the first official records until 2008. The second dataset gathers C1 evidence from 2009 until 2016, from hunting bags and found dead individuals. We generated a map with ArcGIS software, to understand the spatial distribution of the mortality records of the species in Slovakia. Within the third dataset, we generated a Kernel Density Estimation (KDE) analysis, using all C1 and C3 data from 2012 until 2016 (Silverman 1986, Worton 1989, Fleming & Calabrese 2016). We intended to present the spatial frequency of the species, producing an estimative model with the probable permanent range of the species in Slovakia. KDE was generated with ArcGIS software, C1 data was set as the main population field and C3 data as location points to reinforce C1 data.

Results

418 evidences of golden jackals were gathered from all available records, distributed by shot, found dead and observed individuals. It is important to refer that within all the records there is no certified information about breeding pairs.

The first literary reference of golden jackal in Slovakia is from 1947 from four individual pelts, one adult and three sub-adults found in Bratislava (Ferianc 1955, Feriancova-Masarova & Hanak 1965, Sladek & Mosansky 1985, Danko 2012). Given that their origin is unclear, this evidence was not used in any dataset. The first certified record of the golden jackal was registered in 1989 (Mosansky 1995). Evidence from the first dataset comprehends nine golden jackals shot, three found dead (two in vehicle collisions) and seven observed individuals (Table 1). The location of the data is distributed all over Slovakia with the majority being in the South near the border with Hungary, others near the border with Ukraine and few not so far from the border with Austria. Spatially, these records reflect the most probable corridors used in the dispersion and expansion of this species into Slovakia (Fig. 1).

In the second dataset, we gathered all shot (C1) and found dead (C1b) records (Fig. 2). In fact, it was from 2009 that the number of evidence of shot golden jackals became more frequent and increased steadily. Between 2009 and 2014, thirteen golden jackals were shot. In 2015, ten specimens were shot and in 2016 the numbers ascend to twenty-one, representing the highest number of specimens shot in one year. Thus, this depicts the increase of the dispersion of the species throughout the country (Fig. 3).

Within this dataset there were eight individuals found dead, six from animal vehicle collisions and two individuals without any clues for the cause of death. The distribution patterns are more consistent in the southern and eastern parts, but the data collected is widespread through the country (Fig. 3). Of interest, due to its location, is that from all data collected one individual was shot near Valaska in 2014 (black circle in Fig. 3). In the fourth dataset, for the production of the KDE map, we merged 47 points from C1 category as the main data with 363 points from C3 category as presence data. Based on 50 % of the total of the data, KDE50, the map represents the main areas of frequency of presence, resulting in two large areas in the East and two smaller areas, one in the East part of the country and the other in the South of the central part of Slovakia (Fig. 4).

Discussion

The results obtained from all the official presence data collected on the golden jackal are very consistent and they reinforce the fact that the golden jackal is a permanent species in Slovakia (Urban et al. 2016, 2017, Guimaraes et al. 2017). Although, due to the absence of registered data or available references before 1947 in any Slovak literature, there is a high probability that the golden jackal was not part of Slovak fauna in the past. Thus, increasing the probability that it dispersed naturally into the country, supported by the registered presence of the jackal in Hungary near the border (Szabo et al. 2009, Toth et al. 2009). The fact is that from 1947 until 2008, there were only 13 registered occurrences of golden jackals representing the first official records of presence of the species in Slovakia (Fig. 1). It is important to understand the strong probability that their presence in Slovakia (Fig. 3) is a result of natural dispersion following the European expansion, not only of this species but also of all large carnivores (Arnold et al. 2012, Trouwborst et al. 2015).

With the data resulting from the KDE50 (Fig. 4), it is possible to predict areas with permanent occupancy, helping us understand the traits and possible limitations they face in the Slovak landscape, especially when the collection of evidence is done systematically in consecutive years.

In recent years, with the rapid growth of the golden jackal population in Hungary, studies reveal that the pattern of dispersion is towards North and West (Toth et al. 2009, Arnold et al. 2012, Trouwborst et al. 2015, Hatlauf et al. 2017). In the spatial representation of the C1 records, from 2009 until 2016 (Fig. 3), it is possible to identify that golden jackals are found more in the South and presumably reside in the Southeast. It also reinforces the patterns of migration into Slovakia from Hungary and Ukraine (Volokh et al. 1998, Szabo et al. 2009, Zagorodniuk 2014).

In the last decade, distribution of the golden jackal and the numbers of individuals recorded in Slovakia (Fig. 2) enhance the need for a sustainable management program of the species to avoid possible consequences associated with their establishment and in order to deliver accurate estimate numbers of the population. There is still a large gap in information throughout the evidence regarding its presence and, thus, it is necessary to determine and differentiate whether we have identified the presence of a vagrant or stable population in some parts of the country.

The golden jackal's increasing presence and more probable establishment in Slovakia can represent a great challenge for local authorities and decision makers (Trouwborst et al. 2015). Population can increase in a short period of time (Ivanov et al. 2016), assisted by their capacity for long-distance dispersion (Rutkowski et al. 2015). Competition between the golden jackal and the red fox (Vulpes vulpes), and an impact on other species which inhabit common habitats, can probably be expected (Lanszki & Heltai 2002, Lanszki et al. 2006, 2010, Markov & Lanszki 2012, Cirovic et al. 2014, Kowalczyk et al. 2015, Penezic & Cirovic 2015).

The presence of the three large carnivores in Slovakia (Ursus arctos, Canis lupus and Lynx lynx) can be a limiting factor for the expansion and establishment of the species through the entire country as described in other countries (Newsome et al. 2015, Krofel et al. 2017). The interaction between species should be assessed and therefore further field surveys and other studies should be implemented.

This article review reveals that the presence of the golden jackal in Slovakia is more common and largely dispersed throughout the territory (Urban et al. 2016, Guimaraes et al. 2017). All this knowledge will be useful to support the elaboration, approval and implementation of the necessary care program for the golden jackal in Slovakia, including the introduction of monitoring to bring further knowledge of the status of the species (Guimaraes et al. 2017, Urban et al. 2017).

Acknowledgements

We are grateful to our colleagues Peter Kusik, Dusan Rajsky, Stanislav Ondrus, Erika Urbanovd, Jana Durovd and Jennifer Hatlauf for their assistance, comments and/or help with the fieldwork. We also thank Gregg Losinski and Ana Ferreira for proofreading.

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Nuno GUIMARAES (1*), Jozef BUCKO (2) and Peter URBAN (1)

(1) Department of Biology and Ecology, Faculty of Natural Sciences, Matej Bel University in Banska Bystrica, 974 01 Banska Bystrica, Slovakia; e-mail: nunoguimaraes08@gmail.com, urban.lutra@gmail.com

(2) National Forest Centre, Institute for Forest Resources and Information in Zvolen, 960 01 Zvolen, Slovakia; e-mail: bucko@nlcsk.org

Received 9 July 2018; Accepted 6 March 2019

(*) Corresponding Author

DOI: 10.25225/fozo.046.2019
Table 1. Data collected from golden jackal in Slovakia in the period
1989-2008 (* - dead resulting on vehicle collision; HU-Hungary;
UA-Ukraine, AT-Austria; NLC-Nacional Forest Centre database).

Year  Code  District      Locality    Cardinal   Proximity   Shot
                                      points     to border

1989  A     Trebisov      Cierna nad  Southeast  < 6 km      1
                          Tisou                  HU-UA

1995  B     Zlate         Zlatno      West       < 60 km HU  1
            Moravce

1996  C     Dunajska      Gabcikovo   Southwest  < 6 km HU   1
            Streda

1997  D     Vel'ky Krtis  Dolinka     South      < 3 km HU   1

1999  E     Liptovsky     Kralova     North      < 75 km HU  2
            Mikulas       Lehota      Centre

2000  F     Trebisov      Leles       East       < 10 km     1
                                                 HU-UA
2001  G     Trebisov      Leles       Southeast  < 10 km     1
                                                 HU-UA
2002  H     Levice        Zalaba-     South      < 5 km HU   0
                          Pastovce
      I     Nove Zamky    Novy Gug    Southwest  < 25 km HU
2006  J     Trnava        Trnava      Center     < 45 km
                                                 HU-AT       0
      K     Nitra         Bab         Southeast  < 64 km
                                                 HU-AT
2007  L     Trebisov      Trebisov    Southeast  < 15 km HU  0
                                                 < 34 km UA
      M     Dunajska      Gabcikovo   Southwest  < 3 km HU
            Streda                               < 34 km AT
      N     Banska        Banska      Center     < 65 km HU  0
2008  O     Bystrica      Bystrica               < 44 km HU  1
            Vranov nad
            Toplou        Bystre      East       < 62 km UA  1

Year  Found  Observed  Source
      dead

1989  0      0         Mosansky 1995

1995  0      0         Hell & Bleho 1995, Hell
                       & Rajsky 2000, Rajsky &
                       Nagy 1998, Rajsky et al.
                       2005

1996  0      0         Hell & Bleho 1995, Hell
                       & Rajsky 2000, Rajsky &
                       Nagy 1998, Rajsky et al.
                       2005
1997  0      0         Hell & Bleho 1995, Hell
                       & Rajsky 2000, Rajsky &
                       Nagy 1998, Rajsky et al.
                       2005
1999  0      0         NLC 1999 (unpublished
                       data)

2000  0      0         NLC 2000 (unpublished
                       data)
2001  0      1         Danko 2012, Balaskovics
                       et al. 2013
2002  1      0         Danko 2012

      1*
2006
      1*     0         Balaskovics et al. 2013

             2
2007  0      2         Danko 2012, NLC 2007
                       (unpublished data)

             1
             1
2008  0      0         Danko 2012

             0
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Author:Guimaraes, Nuno; Bucko, Jozef; Urban, Peter
Publication:Folia Zoologica
Geographic Code:4EXHU
Date:Jun 1, 2019
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