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40 results for “Golden jackal”
Dietary flexibility promotes range expansion: the case of golden jackals in Eurasia
<p class="MsoNormal"><strong><span>Aim: </span></strong><span>Exploring the drivers of the successful ongoing expansion of the golden jackal across Europe is essential to understand the species' trophic ecology. We analysed which climatic and environmental factors affected the dietary composition of golden jackals and compared these drivers in the species' historic and recently colonised distribution ranges</span><span>.</span></p> <p class="MsoNormal"><strong><span>Location:</span></strong><span> Eurasia.</span></p> <p class="MsoNormal"><strong><span>Taxon</span></strong><span>: golden jackal (<em>Canis aureus</em>).</span></p> <p class="MsoNormal"><strong><span>Methods:</span></strong><span> Using 40 published data sets, we modelled the diet composition using 13 food categories based on the relative frequency of occurrence of food items and trophic niche breadth (B<sub>A</sub>) against climatic and environmental factors from throughout the jackals' recently colonised (22 studies) and historic range (18 studies).</span></p> <p class="MsoNormal"><strong><span>Results:</span></strong><span> The proportion of small mammals in golden jackal diet decreased with annual mean temperature, whereas the consumption of wild ungulates increased with environmental productivity. Increasing temperature and environmental productivity positively influenced niche breadth, while increasing precipitation negatively affected it. The recently colonised distribution range of golden jackals in Europe had a lower mean temperature but higher environmental productivity compared to the species' historic range in Eurasia. In the recently-colonised range, jackals consumed small mammals and/or wild ungulates (mostly from scavenging) more frequently, and fewer plants and/or domestic animals (again, mostly from scavenging). </span></p> <p><strong><span>Main Conclusions:</span></strong><span><strong> </strong>The golden jackal is an opportunistic, omnivorous carnivore with high dietary flexibility</span> <span>and biogeographical variation. Climatic and environmental factors shape the species' diet composition, which, in a changing environment, greatly enhances the opportunities for golden jackals to colonise new areas successfully. Golden jackals will likely continue to expand their range in the foreseeable future. The species' trophic niche is expected to broaden with predictions of overall increasing temperatures and reduced precipitation.</span></p>
Supplementary material 1 from: Pyšková K, Storch D, Horáček I, Kauzál O, Pyšek P (2016) Golden jackal (Canis aureus) in the Czech Republic: the first record of a live animal and its long-term persistence in the colonized habitat. ZooKeys 641: 151-163. https://doi.org/10.3897/zookeys.641.10946
Goledn jackal's howling record : Explanation note: Recording of an individual howling back to the recording of golden jackal. Recorded on 15 September 2015 around midnight.
Data from: Genetic structure and expansion of golden jackals (Canis aureus) in the north-western distribution range (Croatia and eastern Italian Alps)
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Dietary flexibility promotes range expansion: the case of golden jackals in Eurasia
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Figure 7 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 7 Separation of groups by LDAA three taxonomic groups were included in the analysis: Eurasian golden jackals, African golden jackals and African wolves B specimens from Dalmatia were included in the analysis as a separate group.
Figure 5 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 5 PCA ratio spectrum for the first and second principal component in shape space of the 14 craniodental measurements. See Material and methods and Figure 2 caption for the definition of the craniodental measurements.
Supplementary material 1 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
: Data type: list of specimens.
Figure 4 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 4 Principal component analysis. The first two principal components in shape space account for 53.6 % of the variance. Ellipses show 95 % confidence interval for each group. Specimens of Canis aureus are divided in two groups – Europe and Asia Minor, and Croatia (the Dalmatian coast). A separation between taxonomic groups along isometric size and second principal component B separation between taxonomic groups along first two principal components in shape space.
Figure 8 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 8 The ratios that best separated taxon groups revealed by the LDA ratio extractor. The measure δ indicates how well shape discriminates in relation to size. A value of δ close to unity means that separation is mainly due to size, whereas a value close to zero indicates separation is mainly due to shape.
Figure 6 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 6 Allometry ratio spectrum of the 14 craniodental measurements used in this study. See Material and methods and Figure 2 caption for the definition of the craniodental measurements.
Figure 3 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 3 Principal component analysis. Separation between taxonomic groups along isometric size and first principal components in shape space. Ellipses show 95 % confidence interval for each group. Specimens of Canis aureus are divided in two groups – Europe and Asia Minor, and Croatia (the Dalmatian coast). A country origin of European specimens is marked with different symbols B country origin of African specimens is presented.
Figure 2 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 2 Skull measurements employed in the analyses (following von den Driesch 1976): condylobasal length (Cbl), greatest length of the nasals (Nasl), length of the carnassial (P4), measured at the cingulum (Lp4), greatest diameter of the auditory bulla (Bull), greatest breadth of the braincase (Skb), zygomatic breadth (Zyg), least breadth at the postorbital constriction (Pob), frontal breadth (Fb), least breadth between the orbits (Iob), greatest palatal breadth (Palb), least palatal breadth (Rb), skull height (Skh), total length of the mandible (Mand) and length of the carnassial (M1), measured at the cingulum (Mlm1). ACanis cranium, dorsal view BCanis cranium, left side view CCanis cranium, basal view DCanis mandible, left side, lateral view ECanis upper and lower carnassial (P4 and M1).
Figure 1 from: Stoyanov S (2020) Cranial variability and differentiation among golden jackals (Canis aureus) in Europe, Asia Minor and Africa. ZooKeys 917: 141-164. https://doi.org/10.3897/zookeys.917.39449
Figure 1 Map of Eurasian golden jackal range (Hoffmann et al. 2018) and African wolf range (Hoffmann and Atickem 2019) based on IUCN Red List data. Sample localities (countries) and number of measured specimens are shown. Note: The range map of Eurasian golden jackal from IUCN Red List has not been updated since 2008. The confirmed presence of jackals in Poland, Denmark, Netherlands and Baltic countries is not shown.
Figure 1 from: Pyšková K, Storch D, Horáček I, Kauzál O, Pyšek P (2016) Golden jackal (Canis aureus) in the Czech Republic: the first record of a live animal and its long-term persistence in the colonized habitat. ZooKeys 641: 151-163. https://doi.org/10.3897/zookeys.641.10946
Figure 1 - Location of the study area in central Bohemia, western part of the Czech Republic (black rectangle). Previous records relating to dead animals (solid circles), and the first unconfirmed observation (empty circle) are also shown. The records are given by the year of observation, see details in Table 1.
Figure 2 from: Pyšková K, Storch D, Horáček I, Kauzál O, Pyšek P (2016) Golden jackal (Canis aureus) in the Czech Republic: the first record of a live animal and its long-term persistence in the colonized habitat. ZooKeys 641: 151-163. https://doi.org/10.3897/zookeys.641.10946
Figure 2 - Photographs of a golden jackal (Canis aureus) individual in the summer (A) and winter (B).
Figure 4 from: Pyšková K, Storch D, Horáček I, Kauzál O, Pyšek P (2016) Golden jackal (Canis aureus) in the Czech Republic: the first record of a live animal and its long-term persistence in the colonized habitat. ZooKeys 641: 151-163. https://doi.org/10.3897/zookeys.641.10946
Figure 4 - Distribution of the golden jackal (Canis aureus) individual's circadian activity over the study period. Records from the whole monitoring period were pooled and related to the time of the day in which the photographs were taken.
Figure 3 from: Pyšková K, Storch D, Horáček I, Kauzál O, Pyšek P (2016) Golden jackal (Canis aureus) in the Czech Republic: the first record of a live animal and its long-term persistence in the colonized habitat. ZooKeys 641: 151-163. https://doi.org/10.3897/zookeys.641.10946
Figure 3 - Distribution of the records of golden jackal. The numbers of photographs per week are given.
Data from: Genome-wide evidence reveals that African and Eurasian Golden Jackals are distinct species
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Figure 4 in Current status, distribution, and conservation of brown bear (Ursidae) and wild canids (gray wolf, golden jackal, and red fox; Canidae) in Turkey
Figure 4. The distribution map of red fox.
Data from: Distance estimation of howling golden jackal packs (Canis aureus)
<p>This dataset contains the R-Script as well as the necessary data to run the analysis of our manuscript "Distance estimation of howling golden jackal packs (Canis aureus)". More details on data collection and methods can be found in the manuscript and the supplementary material of the main article.</p>
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