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  • 1
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    Diet is not related to productivity but to territory occupancy in a declining population of Egyptian Vultures Neophron percnopterus
    Cambridge University Press (CUP) ; 2016
    In:  Bird Conservation International Vol. 26, No. 3 ( 2016-09), p. 273-285
    Details
    In: Bird Conservation International, Cambridge University Press (CUP), Vol. 26, No. 3 ( 2016-09), p. 273-285
    Abstract: A prominent threat to European vultures has been sanitary regulations that banned the disposal of livestock carcasses. Changes in food abundance following these regulations have been associated with changes in vulture behaviour and demographic parameters, but to what extent diet changes are responsible for population declines is poorly understood. The Egyptian Vulture Neophron percnopterus is the smallest and most threatened European vulture species and has an opportunistic and diverse diet. In Eastern Europe, the Egyptian Vulture population is declining more rapidly than elsewhere but there is little information on diet composition and the relationship between diet and demographic parameters to inform conservation management. We examined whether Egyptian Vulture population declines in Bulgaria and Greece may have been associated with diet changes that affected breeding productivity by monitoring breeding success and collecting diet remains from 143 Egyptian Vulture breeding attempts between 2006 and 2013. We found no relationship between diet diversity or composition and productivity. However, there was a significant relationship between occupancy rate of territories and diet diversity, indicating that occupancy rate decreased with a very diverse or a very narrow diet and a higher proportion of wild animals or a lower proportion of livestock in the diet. There was no temporal change in diet diversity in Bulgaria after admission to the EU in 2007. We conclude that it is unlikely that diet limitations on reproductive output are a critical threat to Egyptian Vultures on the Balkan Peninsula. The relationship between diet diversity and territory occupancy rate may indicate that adult birds with a very narrow or a very broad diet may be more susceptible to consuming poisoned carcasses, and more information on the effect of diet availability on adult and juvenile survival would be useful to inform and improve conservation management actions.
    Type of Medium: Online Resource
    ISSN: 0959-2709 , 1474-0001
    URL: Article
    DOI: 10.1017/S0959270915000155
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2016
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  • 2
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    Identifying critical migratory bottlenecks and high‐use areas for an endangered migratory soaring bird across three continents
    Wiley ; 2018
    In:  Journal of Avian Biology Vol. 49, No. 7 ( 2018-07)
    Details
    In: Journal of Avian Biology, Wiley, Vol. 49, No. 7 ( 2018-07)
    Abstract: Migrant birds face a number of threats throughout their annual cycle, including persecution, collision with energy infrastructure, and habitat and climate change. A key challenge for the conservation of migrants is the identification of important habitat, including migratory concentration areas, because species survival rates may be determined by events in geographically very limited areas. Remote‐tracking technology is facilitating the identification of such critical habitat, although the strategic identification of important sites and incorporation of such knowledge in conservation planning remains limited. We tracked 45 individuals of an endangered, soaring migrant (Egyptian vulture Neophron percnopterus ), over 75 complete migrations that traversed three continents along the Red Sea Flyway. We summarize and contextualize migration statistics by season and age class, including migration start, midpoint, and end dates, as well as linear and cumulative migration distance, migration duration and speed, and route straightness. Then, using dynamic Brownian bridge movement models, we quantified space use to identify the most important migratory bottlenecks and high‐use areas on the flyway. These areas each accounted for 〈 5% of the overall movement range of the tracked birds, yet 〉 20% of all tracks passed through bottlenecks, and 〉 50% of the overall vulture time spent on migration fell within high‐use areas. The most important sites were located at the southeastern Red Sea coast and Bab‐el‐Mandeb Strait (Saudi Arabia, Yemen, Djibouti), the Suez Canal zone (Egypt), and the Gulf of Iskenderun (Turkey). Discouragingly however, none of the area within the major migratory bottlenecks was protected and 〈 13% of the high‐use areas were protected. This demonstrates a very concerning gap in the protected area network for migratory soaring birds along the Red Sea Flyway. Because reducing threats at migratory concentrations can be a very efficient approach to protect populations, our work provides clear guidelines where conservation investment is urgently needed to benefit as many as 35 migratory soaring‐bird species that regularly use the Red Sea Flyway.
    Type of Medium: Online Resource
    ISSN: 0908-8857 , 1600-048X
    URL: Issue
    URL: Article
    DOI: 10.1111/jav.2018.v49.i7
    DOI: 10.1111/jav.01629
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2028018-X
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  • 3
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    A subtle threat: behavioral and phenotypic consequences of invasive mosquitofish on a native paedomorphic newt
    Springer Science and Business Media LLC ; 2020
    In:  Biological Invasions Vol. 22, No. 4 ( 2020-04), p. 1299-1308
    Details
    In: Biological Invasions, Springer Science and Business Media LLC, Vol. 22, No. 4 ( 2020-04), p. 1299-1308
    Type of Medium: Online Resource
    ISSN: 1387-3547 , 1573-1464
    URL: Article
    DOI: 10.1007/s10530-019-02181-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 2014991-8
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  • 4
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    The Migration of the Lesser Kestrel Falco naumanni in Eastern Europe - A Ringing Recovery and Direct Observation Approach
    Walter de Gruyter GmbH ; 2016
    In:  Acrocephalus Vol. 37, No. 168-169 ( 2016-11-1), p. 49-56
    Details
    In: Acrocephalus, Walter de Gruyter GmbH, Vol. 37, No. 168-169 ( 2016-11-1), p. 49-56
    Abstract: We examined ringing recovery data of the Lesser Kestrel Falco naumanni in order to analyse its migration patterns and philopatry rates in Eastern Europe. In addition, we extracted counts of migrating birds from online databases and studied the use of the flyway as well as the phenology of both spring and autumn migrations through Greece. Birds appeared to migrate in the same mean direction in spring and autumn through the Italian and Balkan Peninsulas. During spring, movements took place on a broad front from March until mid- May with a peak in mid-April; in autumn, birds migrated through Greece on a narrower front from early August to early October, with most of individuals passing through Greece in mid-September. Finally, philopatry rates were higher for adults, while juvenile birds dispersed more often and at longer distances, up to 974 km away. Our results on migration patterns generally agree with those in other studies, but we found some evidence of long-distance premigratory movements towards mainland Greece that could also shape the narrower front migration in autumn. In addition, long distance dispersal movements of juveniles in southeastern Europe, where Lesser Kestrel populations show a fragmented distribution, could facilitate gene flow between populations, thus avoiding the negative effects of mating with genetically similar individuals.
    Type of Medium: Online Resource
    ISSN: 0351-2851
    URL: Article
    DOI: 10.1515/acro-2016-0002
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2016
    detail.hit.zdb_id: 2437738-7
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  • 5
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    Conservation genetics of a resident population of Greylag Goose (Anser anser) at the southernmost limit of the species’ distribution in Europe
    Elsevier BV ; 2018
    In:  Avian Research Vol. 9, No. 1 ( 2018-12)
    Details
    In: Avian Research, Elsevier BV, Vol. 9, No. 1 ( 2018-12)
    Type of Medium: Online Resource
    ISSN: 2053-7166
    URL: Article
    DOI: 10.1186/s40657-018-0139-0
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2018
    detail.hit.zdb_id: 2806572-4
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  • 6
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    Arriving depleted after crossing of the Mediterranean: obligatory stopover patterns underline the importance of Mediterranean islands for migrating birds
    Walter de Gruyter GmbH ; 2022
    In:  Animal Migration Vol. 9, No. 1 ( 2022-01-01), p. 14-23
    Details
    In: Animal Migration, Walter de Gruyter GmbH, Vol. 9, No. 1 ( 2022-01-01), p. 14-23
    Abstract: Hundreds of millions of birds reach the Mediterranean islands or Mediterranean coast of Europe every spring after having crossed the Sahara Desert and the Mediterranean Sea. Using data from three small insular stopover sites, we calculated body mass without fuel for 18 trans-Saharan passerine migrants. We subsequently used arrival fuel loads coupled with potential flight range estimates to assess the percentage of birds that are forced to perform an obligatory stopover after crossing the Mediterranean Sea due to fuel depletion. Average arrival fuel loads were among the lowest ever recorded in the Mediterranean region and minimum body mass values recorded for several species were lower than any other individual value reported. The percentage of birds that needed to replenish their energy stores before resuming their northward migration journey varied from 0% to 50% depending on the species and locality studied. Based on conservative estimates at least 180 million birds of our study species are expected to migrate through Greece, 14% of which would not be able to resume their migration without refueling. The significance of small islands and coastal sites in the Mediterranean as obligatory refuelling sites is discussed and their conservation value for migratory birds is highlighted under the perspective of climate change.
    Type of Medium: Online Resource
    ISSN: 2084-8838
    URL: Article
    DOI: 10.1515/ami-2022-0117
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
    detail.hit.zdb_id: 2860502-0
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  • 7
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    Landscape factors affecting territory occupancy and breeding success of Egyptian Vultures on the Balkan Peninsula
    Springer Science and Business Media LLC ; 2017
    In:  Journal of Ornithology Vol. 158, No. 2 ( 2017-4), p. 443-457
    Details
    In: Journal of Ornithology, Springer Science and Business Media LLC, Vol. 158, No. 2 ( 2017-4), p. 443-457
    Type of Medium: Online Resource
    ISSN: 2193-7192 , 2193-7206
    URL: Article
    DOI: 10.1007/s10336-016-1410-y
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2017
    detail.hit.zdb_id: 2134595-8
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  • 8
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    Phylogenetic analysis of the critically endangered Karpathos water frog (Anura, Amphibia): conservation insights from complete mitochondrial genome sequencing
    Brill ; 2023
    In:  Amphibia-Reptilia Vol. 44, No. 3 ( 2023-08-08), p. 277-287
    Details
    In: Amphibia-Reptilia, Brill, Vol. 44, No. 3 ( 2023-08-08), p. 277-287
    Abstract: The Karpathos water frog ( Pelophylax cerigensis ) is classified as Critically Endangered according to the IUCN Red List and its distribution is restricted on the island of Karpathos, South Aegean Sea. Utilizing a next generation sequencing approach, we obtained whole mitochondrial genomes of P. cerigensis to determine the species phylogenetic position within the genus Pelophylax and to clarify the phylogenetic relationship between the species’ population on Karpathos Island and the population of P . cf. bedriagae from the neighboring Rhodes Island. High-throughput sequencing generated mean ± SD = 227 945 ± 18 306 reads averaged per sample. High quality reads were assembled resulting in the complete mitogenome of P. cerigensis of a total size of 17 922 bp. Mitogenome organization was similar to other Pelophylax species, comprising of 13 Protein Coding Genes (PCGs), 22 tRNAs, two rRNAs and one Control Region. Overall mean genetic distance for the 13 PCGs, within the Ranidae family, ranged from 8.01% ( COIII ) to 11.6% ( ATP8 ), while ratios of synonymous and non-synonymous substitutions were 〈 1 in all the 13 PCGs, indicating purifying selection. Maximum Likelihood and Bayesian Inference analyses based on the concatenated sequences of 13 PCGs and two rRNAs (12S and 16S), showed that individuals from Karpathos and Rhodes form a well-supported monophyletic group with low genetic distance between them ( p-distance  = 0.1%). Hence, the Rhodes populations seem to belong to P. cerigensis and not to P. bedriagae as formerly thought, highlighting the need for revision of P. cerigensis current conservation status as well as further examination of the P. bedriagae species group.
    Type of Medium: Online Resource
    ISSN: 0173-5373 , 1568-5381
    URL: Article
    DOI: 10.1163/15685381-bja10138
    Language: Unknown
    Publisher: Brill
    Publication Date: 2023
    detail.hit.zdb_id: 2036962-1
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  • 9
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    Population reinforcement and demographic changes needed to stabilise the population of a migratory vulture
    Wiley ; 2021
    In:  Journal of Applied Ecology Vol. 58, No. 12 ( 2021-12), p. 2711-2721
    Details
    In: Journal of Applied Ecology, Wiley, Vol. 58, No. 12 ( 2021-12), p. 2711-2721
    Abstract: Μία προσέγγιση που στοχεύει στη σταθεροποίηση μικρών και μειούμενων πληθυσμών είναι η αναπαραγωγή ατόμων σε αιχμαλωσία και στη συνέχεια η απελευθέρωσή τους στην φύση για την ενδυνάμωση των υπαρχόντων πληθυσμών, ενώ παράλληλα συνεχίζονται οι διαχειριστικές δράσεις που στοχεύουν στον περιορισμό των απειλών. Τέτοια προγράμματα ενδυνάμωσης πληθυσμών, για να είναι επιτυχημένα, απαιτούν μακροπρόθεσμη δέσμευση και μπορούν να εκτρέψουν τους ήδη περιορισμένους πόρους από άλλα μέτρα διατήρησης. Είναι επομένως απαραίτητη μια διεξοδική αξιολόγηση του κατά πόσον οι δράσεις ενδυνάμωσης μπορούν να οδηγήσουν έναν πληθυσμό σε σταθεροποίηση, έτσι ώστε πιθανές επενδύσεις σε τέτοιες δράσεις να είναι δικαιολογημένες. Πολλά μεταναστευτικά είδη πουλιών υφίστανται υψηλή θνησιμότητα κατά το πρώτο τους ταξίδι οπότε η απελευθέρωση ατόμων που έχουν αναπαραχθεί σε αιχμαλωσία αφού έχουν φτάσει σε μεγαλύτερη ηλικία μπορεί να ωφελήσει προγράμματα ενδυνάμωσης που στοχεύουν πληθυσμούς μεταναστευτικών ειδών. Εδώ, εξετάζουμε εάν ένας μικρός και μειούμενος πληθυσμός ενός μεταναστευτικού είδους αρπακτικού ‐ του Ασπροπάρη ( Neophron percnopterus ) ‐ μπορεί να σταθεροποιηθεί μέσω δράσεων ενίσχυσης που μειώνουν τη θνησιμότητα κατά την πρώτη μετανάστευση. Χρησιμοποιήσαμε πληθυσμιακά μοντέλα για να αξιολογήσουμε ρεαλιστικά σενάρια ενδυνάμωσης και αύξησης της επιβίωσης ώστε να εκτιμήσουμε πόσα άτομα που έχουν αναπαραχθεί σε αιχμαλωσία θα πρέπει να απελευθερωθούν για να επιτευχθεί η σταθεροποίηση του πληθυσμού. Η πιθανότητα επιβίωσης των άγριων νεαρών ατόμων κατά το πρώτο έτος της ζωής τους (0,296, 95% CI 0,234 – 0,384) ήταν πολύ χαμηλή για να οδηγήσει σε έναν σταθερό πληθυσμό (ρυθμός αύξησης πληθυσμού 0,949, 95% CI 0,940 –0,956), αλλά τα νεαρά άτομα που είχαν αναπαραχθεί σε αιχμαλωσία και απελευθερώθηκαν στον δεύτερο χρόνο της ζωής τους, έδειξαν αυξημένη επιβίωση (0,566, 95% CI 0,265 – 0,886) κατά τη διάρκεια του πρώτου έτους τους στη φύση. Η ενδυνάμωση του πληθυσμού με την απελευθέρωση 15 πουλιών ετησίως για 30 χρόνια δεν επαρκεί για την επίτευξη είτε σταθερού είτε θετικού ρυθμού αύξησης του πληθυσμού. Ωστόσο, η δράση ενδυνάμωσης μπορεί να μειώσει την πιθανότητα εξαφάνισης από 48% σε λιγότερο από 1% έως το 2049, εάν 12 ή περισσότερα πουλιά απελευθερώνονταν κάθε χρόνο για 30 χρόνια. Επίσης, εάν η ετήσια πιθανότητα επιβίωσης αυξανόταν κατά 8% θα οδηγούσε σε έναν σταθερό πληθυσμό χωρίς να χρειάζεται καμία δράση ενίσχυσης. Σύνθεση και εφαρμογές. Παρόλο που η ενδυνάμωση του πληθυσμού μπορεί να μειώσει την υψηλή θνησιμότητα των νεαρών ατόμων κατά την πρώτη τους μετανάστευση και να βοηθήσει στην αναστολή μιας τοπικής εξαφάνισης, απαιτείται περαιτέρω βελτίωση της επιβίωσης τους στην φύση για την διασφάλιση ενός μεταναστευτικού πληθυσμού ο οποίος θα συνεχίσει να αντιμετωπίζει απειλές για δεκαετίες παρά τη διαχείριση.
    Type of Medium: Online Resource
    ISSN: 0021-8901 , 1365-2664
    URL: Issue
    URL: Article
    DOI: 10.1111/jpe.v58.12
    DOI: 10.1111/1365-2664.13958
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2020408-5
    detail.hit.zdb_id: 410405-5
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  • 10
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    Stopover Ecology of the European Turtle Dove (Streptopelia turtur), a Threatened Migratory Bird Species, after the Crossing of an Extended Ecological Barrier
    MDPI AG ; 2023
    In:  Birds Vol. 4, No. 2 ( 2023-04-26), p. 202-212
    Details
    In: Birds, MDPI AG, Vol. 4, No. 2 ( 2023-04-26), p. 202-212
    Abstract: Migratory routes, important stopover sites and wintering grounds for the Turtle Dove, a declining trans-Saharan migratory bird, are known mainly for populations in western and central Europe, but very little is known about birds using the eastern migration flyway. By combining long-term ringing data, tracking data and citizen science data, a comprehensive picture of the stopover ecology of the Turtle Dove’s spring migration in the eastern Mediterranean is presented. Furthermore, a quantitative estimate of the number of birds that migrate over Greece during the spring migration is given. Approximately 16% of the European population migrates through Greece, passing through as early as the end of March, with the passage lasting up to the end of May. On average, the species arrives depleted after the crossing of the Sahara Desert and the Mediterranean Sea, with no systematic refuelling event taking place in North Africa. Both tracking and ringing data indicate that the birds undergo an extensive stopover after the barrier crossing (as much as close to three weeks). Turtle Doves additionally show significant body mass gain during their stay, indicating the potential importance of stopover sites after the Mediterranean Sea for the conservation of the species.
    Type of Medium: Online Resource
    ISSN: 2673-6004
    URL: Article
    DOI: 10.3390/birds4020017
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 3066746-X
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