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Review of historical breeding sites of the Northern Bald Ibis Geronticus eremita in Syria and south-eastern Turkey

Published online by Cambridge University Press:  09 February 2021

ANDRE SCHENKER Open the ORCID record for ANDRE SCHENKER [Opens in a new window]  and
GIANLUCA SERRA
ANDRE SCHENKER*
Affiliation:
Gartenstrasse 4, 4142 Münchenstein, Switzerland.
GIANLUCA SERRA
Affiliation:
via Primo Settembre 14, 50014 Fiesole (FI), Italy.
*
*Author for correspondence; email: andre.schenker@gmx.ch
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Summary

An updated and comprehensive compilation and review of the historical breeding sites of the Northern Bald Ibis in Syria and south-eastern Turkey is presented accompanied by all available details. The original sources, dating from the first half of the 19th century to 2010, were thoroughly assessed and reviewed. A detailed distribution map of confirmed and unconfirmed historical Northern Bald Ibis colonies was developed, showing a cluster of colonies located in the central steppe of Syria, between the villages of Qaryatayn and Sukhna, while several other colonies were scattered along the Euphrates river from southern Turkey to Iraq, passing through Syria.

Keywords

Near EastGeronticus eremitahistorical breeding sites

Information

Type
Research Article
Information
Bird Conservation International , Volume 32 , Issue 1 , March 2022 , pp. 137 - 146
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of BirdLife International

Introduction

The Northern Bald Ibis, listed as ‘Endangered’ as of 2017 (BirdLife International 2018), occurred in central Europe and around the Mediterranean until the beginning of the 17th century (Schenker Reference Schenker1977, Böhm and Pegoraro Reference Böhm and Pegoraro2011). In the early 20th century, two separate relict populations survived, a resident or partially migrating population in North Africa (Morocco and Algeria) and a migratory population in the Near East (Collar and Stuart Reference Collar and Stuart1985, Del Hoyo et al. Reference Del Hoyo, Elliot and Sargatal1992). In the Near East only a semi-captive population exists today near Birecik/SE-Turkey with birds which were repeatedly removed from the Birecik colony since the 1970s and kept in aviaries just north of the village (Kumerloeve Reference Kumerloeve1962, Hirsch Reference Hirsch1979, Reference Hirsch1980, Akçakaya Reference Akçakaya1990, Pegoraro Reference Pegoraro1996, Bowden Reference Bowden.2015, Hatipoglu Reference Hatipoglu, Boehm and Bowden2016). A small breeding population discovered in Syria in 2002, most likely the last wild colony in the entire Near East, survived up to 2013 (Serra et al. Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004, Reference Serra, Peske, Abdallah, al Qaim and Kanani2009, Reference Serra, Bruschini, Lindsell, Peske and Kanani2011, Serra Reference Serra2017). The colony’s migratory route and wintering grounds were discovered and described in the years following the discovery (Lindsell et al. Reference Lindsell, Serra, Abdallah, al Qaim and Peske2009, Serra et al. Reference Serra, Bruschini, Peske, Kubsa, Wondafrash and Lindsell2013). However, the final destiny of such colony has to be still confirmed, because the conflict in Syria has halted all monitoring activities (G. Serra unpubl. data).

Although the species has most likely become extinct in the wild in the Near East just recently, we aimed to reconstruct the historical distribution and size of its breeding range within this region. The data used from the original sources date from the first half of the 19th century to the year 2010. No reliable data could be found from the period before the 19th century. The aim of present contribution is (i) to compile and critically review the widely scattered information found in the literature and (ii) to thoroughly consult the original sources.

Methods

A comprehensive and critical analysis of the scientific literature was conducted, including cross-references. Only data from original sources were used, which provided verified or highly plausible occurrences of breeding colonies of the Northern Bald Ibis. Various expedition and travel reports from the Near East are the main source of information from the early 19th century. It is worth noting that the original sources Ainsworth (Reference Ainsworth1842) and Helfer (Reference Helfer1878) are cited for the first time through the present study, accurately and with detailed references. The long-term survey conducted by Serra et al. (Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004) in Syria, during 2000 and 2004, provided the basis for the reconstruction of the occurrence of the breeding sites within Syrian territory, following the pioneer surveys by Aharoni (Reference Aharoni1929).

Results

The results are summarised in detail in Table 1 and shown in a map of the region (Figure 1). The map shows a concentration of historical breeding colonies located in the central steppe of Syria, between the villages of Qaryatayn and Sukhna, and several colonies scattered in the Euphrates Valley from southern Turkey to Iraq, passing through Syria.

Table 1.

Historical breeding sites of Northern Bald Ibis in Syria and south-east Turkey. TEK: traditional ecological knowledge (Serra et al. Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004).

Figure 1.

Map of Syria and south-eastern Turkey showing the distribution and number of historical breeding sites of the Northern Bald Ibis from the 19th century to 2010. Information and sources for each breeding site are provided in the dataset shown in Table 1.

The distribution of breeding colonies in Syria

Helfer (Reference Helfer1878) is an important source for the first half of the 19th century, particularly for the site S1 (City of Raqqa, Euphrates valley; 250 m asl). A quote from the original source Helfer (Reference Helfer1878: 235-236): May 10th 1836. «… Now the harsh clacking of storks is heard there as they stand meditatively on the walls. The black ibis builds its nests by thousands in the ramparts, and troops of jackals and foxes come forth by day from their subterranean haunts”. In 1978 U. Hirsch met Aharoni’s son, Prof. J. Aharoni, who was able to reconstruct the itinerary based on his father’s diary (Hirsch Reference Hirsch1980). However, Hirsch does not provide any precise information about the colony sites in the region around Qaryatayn and Palmyra.

Safriel (Reference Safriel1980) provides an overview of the skins conserved in the Zoological Museum of the Hebrew University in Jerusalem. Almost all the skins collected by Aharoni have lost their labels. However, the 20 skins (nine adult, nine juvenile, two pulli) certainly come from the area between Qaryatayn and Palmyra.

The Northern Bald Ibis in Syria was regarded to have vanished from Syria in the early 1930s (Collar and Stuart Reference Collar and Stuart1985). In 2002, one relict breeding colony of Northern Bald Ibis (three pairs) was discovered in the Palmyra region (Serra et al. Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004). A traditional ecological knowledge (TEK) survey among the indigenous nomad population of the Syrian steppe, including experienced hunters resident in Palmyra, showed that Northern Bald Ibis had in fact been breeding in the Syrian desert steppe west of the Euphrates valley in scattered colonies and sometimes in large numbers until the 1970s and 1980s (Serra et al. Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004, Serra Reference Serra2017).

The distribution of breeding colonies in south-east Turkey

Ainsworth (Reference Ainsworth1842) is an important original source for the first half of the 19th century particularly for sites T1 north-east of Birecik and T2 Birecik. A quote from the original source Ainsworth (Reference Ainsworth1842: 285): “ …we arrived at Yailash, a large village… “. June 13th 1839 “We pitched our tent in a field near the village; and in the evening shot a beautiful green ibis”.

Based on the previous description by Ainsworth of a fertile plain and a village with a central mound, and the subsequent description of the itinerary to Birecik, this large village is quite certainly today’s Yaylak, 500 m asl and at a distance of about 50 km north-east of Birecik. This indicates a hitherto unrecognised occurrence of a Northern Bald Ibis colony. The large breeding colony in Birecik is the best known, and until the 1980s the longest, occupied site in the Near East. The occurrence of the Northern Bald Ibis at this specific site is documented since the first half of the 19th century (Ainsworth Reference Ainsworth1842). A quote from the original source Ainsworth (Reference Ainsworth1842: 305), June 1839 at Birecik: “ …, its caverned houses and climbing ramparts, its rocky shelves studded with green ibis…”.

Discussion

The updated distribution of historical breeding sites of Northern Bald Ibis in the Near East presented in this study confirms the ecological and physical requirements of sheer cliffs with ledges and niches as the nesting habitat of this species (Collar and Stuart Reference Collar and Stuart1985, Serra et al. Reference Serra, Peske, Abdallah, al Qaim and Kanani2009). Open areas of arid and semi-arid seasonal rangeland seem to be the other key ecological requirement as the feeding habitat for the species (Serra et al. Reference Serra, Abdallah and Al Qaim2008).

Birecik colony, most likely one of the largest, if not the largest, in the whole Near East, was reported to have more than 1,000 birds until the mid-1950s. For the local population, the birds were considered sacred and thus protected from persecution (Tristam Reference Tristam1882, Kumerloeve Reference Kumerloeve1958). Until the late 1950s, the ferrymen on the Euphrates were the initiators of the traditional festivities when the Northern Bald Ibis returned from the wintering grounds in February/March. As a consequence of the bridge construction over the Euphrates in the late 1950s and the subsequent large human population growth, including residential construction below and next to the breeding cliffs, this long cultural tradition disappeared (Kumerloeve Reference Kumerloeve1958, Collar and Stuart Reference Collar and Stuart1985). Following an anti-malaria campaign and spraying of desert locust swarms in the late 1950s and 1960s, hundreds of Northern Bald Ibis were poisoned and found dead (Hirsch Reference Hirsch1980). In the 1970s, the colony in Birecik decreased to less than 30 breeding pairs. In 1988 the last breeding of the wild population in Birecik took place (Akçakaya Reference Akçakaya1990). Since the 1970s, Northern Bald Ibis have bred in aviaries just north of the town of Birecik. In recent years, this semi-wild population has reached over 200 individuals (Hatipoglu Reference Hatipoglu, Boehm and Bowden2016).

In addition to the large Birecik colony, some small breeding colonies existed north of the village on cliffs along the Euphrates valley (Kumerloeve Reference Kumerloeve1967, Hirsch Reference Hirsch1980). The specimen which was shot in 1839 near Kaylak, about 50 km north-east of Birecik reported by Ainsworth (Reference Ainsworth1842) may have been part of a previously unknown colony.

In Syria at the beginning of the 20th century, Aharoni collected more than 100 eggs, about as many skins and 30 live young nestlings of Northern Bald Ibis and sent or brought them to Europe (Aharoni Reference Aharoni1911, Reference Aharoni1932). In 1928 only one colony reportedly still survived from the five known to him, hardly accessible by steep and overhanging rocks (Aharoni Reference Aharoni1929).

Unconfirmed breeding sites

S1: A few Northern Bald Ibis were seen on 15 May 1946 south-east of Tell Abiad with flocks of White Storks Ciconia ciconia feeding on Moroccan locust Dociostaurus maroccanus (Brown Reference Brown1946). Tell Abiad is located on the upper course of the Balikh River. However, there is no concrete evidence of a breeding colony in this area. The distance of about 100 km from the closest known breeding colony in Birecik (T2) rather supports an unknown breeding colony in the vicinity.

S18: In the 1950s, Moore and Boswell (Reference Moore and Boswell1956) reported, on hearsay evidence, a breeding colony about 30 miles (c.50 km) west of the city of Abu Kemal. This area in the south-east of Syria is the driest part of the country with an average annual rainfall of 100–150 mm. Potentially suitable nesting cliffs are probably located along dry valleys (wadis), which have only occasional running water. This makes irregular breeding likely, as has been observed in arid and semi-arid areas of southern Morocco (Robin Reference Robin1973). The drought in Syria in 1957–1961 most likely had a similar effect on this unconfirmed colony. From September 1957 to August 1961, the mean of these four years was 53% (79 mm) of the long-term mean for Deir ez Zor and 57% (71mm) for Palmyra (Wirth Reference Wirth1971).

T1: Ainsworth shot a Northern Bald Ibis in June 1839 near the village of Yaylak (see above), about 50 km north-east of Birecik. A possible breeding colony in the area is not known. Yaylak lies about 10 km south of the Euphrates. However, cliffs along the Euphrates and in the small lateral valleys would provide suitable breeding structures. Foraging areas at such a distance from the known breeding sites and the aforementioned evening hour make it rather unlikely that the shot specimen came from the area between Birecik and Halfeti. The direct distance between small colonies south of Halfeti and Yaylak is still about 50 km.

I1: There is some evidence of a possible Northern Bald Ibis breeding colony in northern Iraq. There are three direct observations from the 1920s in northern Iraq at the time of the end of the spring migration: end of January near Kirkuk (Robb in Ticehurst et al. Reference Ticehurst, Cox and Cheesman1926); a few in February near Tikrit (L. Home in Ticehurst et al. Reference Ticehurst, Buxton and Cheesman1922); and one shot at Tikrit by Aldworth (Ticehurst et al. Reference Ticehurst, Buxton and Cheesman1922). These observations are independently confirmed through the TEK surveys performed in 2002–2004 in the Palmyra steppe (Serra et al. Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004): few independent Bedouin sources reported the existence of a Northern Bald Ibis colony breeding on “rocky cliffs of northern Iraq” (Serra unpubl. data). In this context it is worth noting that two elderly Bedouins mentioned a colony near the Euphrates, but the exact location is not known. Bedouins used to have an interest in Northern Bald Ibis whose nestlings were collected from the cliffs as food (Serra et al. Reference Serra, Abdallah, Assaed, Abdallah, Al Qaim, Fayad and Williamson2004).

There are no known breeding colonies from Syria’s western, southern and south-eastern neighbouring countries (exception: I1, unconfirmed). However, there are a number of observations of migrating Northern Bald Ibis in spring and autumn in these neighbouring countries (Hirsch Reference Hirsch1980, Welch and Welch Reference Welch and Welch2004).

Jordan: there is a 1956 observation of autumn migration in mid-November at the Azraq oasis (Bourne Reference Bourne1959).

Lebanon: no observations are known from Lebanon.

Israel: observations are known from the spring migration during March to May in 1962, 1970 and the 1980s (Krabbe Reference Krabbe1983, Lambert and Grimmet Reference Lambert and Grimmet1983, Kyllingstadt Reference Kyllingstadt1986, Shirihai Reference Shirihai1996) and during the autumn migration in August and September from 1975 and 1984 (Paz Reference Paz1987, Shirihai Reference Shirihai1996).

Overall, the present study provides a summary and compilation of former breeding sites of the Northern Bald Ibis in the Near East, by taking into account old studies (before 1870) and grey literature from ornithological journeys during the 19th century. We hope it will provide an important perspective for the conservation of the species, and it will become a key reference for the species in the region.

Acknowledgements

We would like to thank Martina L. Schenker, Zurich for designing the distribution map. Thanks to Markus Unsöld, Zoologische Staatssammlung München, for his valuable help in obtaining literature. We appreciate the constructive comments of two anonymous reviewers on an earlier version of the manuscript.

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Figure 0

Table 1. Historical breeding sites of Northern Bald Ibis in Syria and south-east Turkey. TEK: traditional ecological knowledge (Serra et al.2004).

Figure 1

Figure 1. Map of Syria and south-eastern Turkey showing the distribution and number of historical breeding sites of the Northern Bald Ibis from the 19th century to 2010. Information and sources for each breeding site are provided in the dataset shown in Table 1.