Presentation in Neu-Ulm about Turkey

Presentation in Neu-Ulm about Turkey

Reiseberichte Live lectures

On Saturday, 16 September 2023, Laura and Bobby Bok will give a talk on herpetological trips to Turkey. The herpetofauna of Anatolia is astonishingly diverse – not without reason it is also called “Asia Minor”. Reptiles from the Balkans, the Caucasus, Central Asia and the deserts of Arabia meet here. From turtles to the smallest gecko – there is a lot to tell from Anatolia!

Laura und Bobby Bok Türkiye from Trabzon to the Taurus
DGHT city group Ulm
Il Mio Ristorante
Europastraße 15 (Am Mutenhölzle)
89231 Neu-Ulm
Begin at 6.30 p.m.

Chameleons in mythology

Chameleons in mythology

General topics Newspaper articles

With its independently moving eyes, shooting tongue and ability to change colour, the chameleon was already the subject of superstition and myths in ancient times – and has remained so in many places to this day. An article now published by Prof. Dr. Wolfgang Böhme and natural historian Thore Koppetsch deals with precisely this topic.

The content ranges from the so-called Brooklyn Papyrus, which described a still unexplained “colour-changing” creature of antiquity, to bizarre events involving mother’s milk and chameleons in the Gambia of our time. Probably the oldest written record of a chameleon comes from Greece, from Aristotle himself, who lived from 384 to 322 BC. The term chameleon itself probably goes back to the Greek: chamai and leon were put together to form “earth lion”. However, this interpretation of the origin of the word is not entirely undisputed. The article also deals with superstitions on the island of Samos, in Morocco, Tunisia, Togo, Benin, Cameroon and Madagascar, and the use of chameleons for pseudo-medicine and occultism.

Chamäleons in der Mythologie der Völker
Wolfgang Böhme, Thore Koppetsch
Koenigiana 17, 2023, pp. 39-50
DOI: nicht vorhanden

Presentation in Münster about Cameroon

Presentation in Münster about Cameroon

Reiseberichte Live lectures

On Friday, 19 May 2023, the renowned herpetologist Prof. Dr Wolfgang Böhme will give a lecture on herpetological expeditions in West Africa. In several research trips, he studied the large-scale habitats of desert, savannah, and rainforest and their respective marginal areas with regard to their amphibians and reptiles, whose current distribution reflects the influence of the major postglacial climate fluctuations. The rediscovery of the desert crocodile in the Mauritanian Sahara, thought to be extinct for decades, is just one of many highlights. In Guinea, the Lama Forest proved to be a snake hotspot: in just two weeks, the travellers were able to find 38 species sympatrically. In the Cameroon mountains, where relics of German colonial history can still be found several times, the previously unknown herpetological Mount Nlonako proved to be the most species-rich amphibian site in Africa at the time. The vertical zoning, combined with numerous watercourses, led to a great diversity of frog fauna, which was inventoried for the first time. With over 90 species, including the charismatic hairy and goliath frogs, Mount Nlonako is one of the richest amphibian hotspots in the Afrotropical region. The various, beautiful Montane Chameleons in Cameroon also proved to be an excellent model group to exemplify the process of speciation.

Prof. Dr. Wolfgang Böhme Overland from Germany to Cameroon
DGHT City group Münster
Zoo school of Allwetterzoo
Sentruper Str. 315
48161 Münster
Admission from 6.30 p.m., lecture begins at 7 p.m.

Rhampholeon spectrum – not just one species?

Rhampholeon spectrum – not just one species?

Science

The pygmy chameleon genus Rhampholeon is mainly found in East Africa. Rhampholeon viridis, Rhampholeon spinosus, and Rhampholeon temporalis each live in clearly defined and isolated areas of Tanzania. Rhampholeon spectrum, however, seems to be the complete opposite so far: The species has an enormous range in western Africa. It extends from Côte d’Ivoire through Ghana, Togo, and Benin to Nigeria and the outskirts of Niger and Chad, then on through Cameroon, Equatorial Guinea, and Gabon into the Central African Republic as well as the Democratic Republic of Congo and the Republic of Congo. Researchers from the USA and Cameroon have now investigated genetically what is behind the wide distribution.

Samples from an island at the northernmost tip of Equatorial Guinea, several mountains in Cameroon, and samples from two areas in Gabon were examined. To the researchers’ astonishment, it turned out that Rhampoleon spectrum is by no means genetically identical everywhere. Two clades could be identified from the samples: One in the lowlands and one in the montane forest, where the chameleons are found exclusively above 700 m a.s.l. A total of five genetically distinct populations were identified, several of which may represent new, as yet undescribed chameleon species.

The lowland clade includes the population in Gabon, where chameleons were sampled from Ivindo National Park and animals in an area near the town of Mekambo. The second population of the lowland clade occurs at low altitudes on Mount Korup, a mountain of volcanic origin. Mount Korup is located in the protected national park of the same name in Cameroon on the border with Nigeria.

The montane clade of the Rhampholeon spectrum includes three populations. One population occurs on Mount Biao on the island of Bioko, which belongs to Equatorial Guinea. A second population is found on Mount Cameroon, an active volcano in western Cameroon not far from the Gulf of Guinea. The type specimen of Rhampholeon spectrum comes from Mount Cameroon. The locality mentioned in the first description, Mapanja, is only a few kilometres away from one of the places where individuals were collected in the present study. This population is therefore probably the “true” Rhampholeon spectrum, the so-called topotypic group. The third population of the montane clade is found on three neighbouring mountains in Cameroon: Mount Kupe, Mount Mangengouba, and Mount Nlonako. Together with Mount Cameroon and Mount Biao, all three belong to the so-called Cameroon Line, a mountain range of volcanic origin that stretches along the border between Cameroon and Nigeria from the sea to Lake Chad.

The researchers are also looking into the question of how the different populations might have evolved. The separation between Rhampoleon spectrum and the pygmy chameleons in Tanzania can be dated to the late Eocene around 40 million years ago. During this time, the previously continuous rainforests in West, Central, and East Africa broke up into smaller, sometimes isolated fragments. The Rhampoleon spectrum clade then split into lowland and montane populations in the Miocene around 11.1 million years ago. In the Miocene, tectonic movements led to the uplift of a low mountain range that extended from southern Cameroon to the south of the Republic of Congo. Rivers, deserts, and other geographical barriers changed. Somewhat later, about 9.3 million years ago, the population on Bioko Island split off. The island’s pygmy chameleons are thus older than the island itself – the researchers explain this phenomenon by the fact that the island must have been connected to mainland Africa via a land bridge in the past. The chameleons would therefore have colonised the island, found a home on the mountain, and only then became isolated from the mainland. However, the genetically identical population on the mainland could not be found – researchers consider it extinct. In the late Miocene, around 6.9 million years ago, the populations on Mount Korup and in Gabon emerged. Only at the transition from the Miocene to the Pleistocene, 5.2 million years ago, did the populations on Mount Cameroon and Mount Kupe emerge.

Further research on this topic will show whether new species are actually hiding under the name Rhampholeon spectrum – chances are good. It would also be interesting to investigate populations of the species that are not mentioned in this study. Because, of course, the Rhampholeon spectrum from southern and eastern Cameroon, continental Equatorial Guinea, southern Gabon, and the Congo could also be further, independent populations. Science remains exciting!

Diversification and historical demography of Rhampholeon spectrum in West-Central Africa
Walter Paulin, Tapondjou Nkonmeneck, Kaitlin E. Allen, Paul M. Hime, Kristen N. Knipp, Marina M. Kameni, Arnaud M. Tchassem, LeGrand N. Gonwouo, Rafe M. Brown
PLOS One, December 2022
DOI: 10.1371/journal.pone.0277107