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Gulf of Guinea Expeditions 

May 22, 2012

The Race: Sixth Gulf of Guinea Expedition Redux

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All of the GG VI participants are home now, and our specimens and materials are safely ensconced in their respective departments at the Academy.  For the first time, we had an official patch for the expedition. The original design of the cobra bobo and giant Begonia was drawn by one my graduate students, Dashiell Harwood. The patch was produced by our friend, Mike Murakami, who played such an important role in the production of the biodiversity coloring books (more about the education project below.) We gave many of these stick-on patches to third grade teachers to hand out as incentives to hard-working students.

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Dr. Iwamoto consuming his favorite, the concon. (A. Stanbridge – GG VI

Soon after Dr. Tomio Iwamoto, our marine ichthyologist and veteran of GGI and GG II returned home to the Academy a few weeks before the last of us, he left for Africa again. And, once again, he is aboard the Norwegian research vessel, the R.V. Nansen, as a senior scientist. I devoted an entire blog to his last trip aboard the Nansen, a couple of years ago.  They are trawling for deep water fish off the coast of Guinea Conakry. I believe the ship will also be exploring the coast of Mauritania in the following weeks. Since he left before we returned we have not been able to discuss his findings during GG VI; but below is a photo of the strange pipefish he and and Dr. Brian Simison seined in northern Sấo Tomé

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Microphis, the only member of its family reported from Sấo Tomé and Príncipe. (B. Simison-GG VI)

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Our botanists had a “a field day,” so to speak.  Recall that Jim Shevock (right) made 682 collections during GG IV, and this time he figured he would just pick up a few things he missed.  Not so. He estimates that among the 647 collections he made in GG VI are between 50 to 100 species of bryophytes he had not seen before, and these include at least 12 genera of liverworts and 12 genera of mosses that are new to the islands.
Miko Nadel (left, above) really has his hands full trying to sort out the lichens; there are 129 previously known species, but Miko made 475 collections, many of which will undoubtedly be new.  He tells me that lichenologists classify lichens by the supporting fungus rather than the symbiotic algae.

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Pico Mesa,  Príncipe ( RCD -  GG III)

In an earlier blog from the islands, I reported that Jim, Miko and our photographer Andrew were the first CAS workersto study the top of Pico do Sấo Tomé. Later on Príncipe, Jim and Miko became the first of us to reach the top of Pico Mesa (above).  Because they had to walk there rather than reaching the base by boat, they were only able to explore the northern most reaches of it; it appears to be a botanist’s paradise, and we will definitely return. Dr. Tom Daniel (GG III and IV) is particularly interested in getting up there as Miko photographed an endemic Impatiens at the top.

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Gabriel, me, Rayna Bell and Joao Pedro Pio at Bom Sucesso (A. Stanbridge – GGVI)

The herpetologists also did well. Rayna and I were assisted by a young Portuguese biologist, Joao Pedro Pio (far right), currently working on the endangered endemic maroon pigeon for workers at the University of Lisbon. He and his co-workers (including Gabriel, left) accompanied Rayna on all of her nocturnal frog hunts.

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Above is Hyperolius molleri, the oceanic treefrog typically inhabiting the lower elevations of both islands. This particular frog is being devoured by a wolf spider and note that it is largely a uniform green in color. In many earlier blogs, I have included images of the Sấo Tomé giant treefrog which is much bigger, has bright orange and black markings and is typically found above 1100 meters.

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Rayna’s sample from between 700 and 900 meters would strongly suggest that the two species are hybridizing at this level.  This is pretty exciting in that, if supported by genetic analysis, it will fit right into her PhD thesis at Cornell University.

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While I failed to find adult specimens of the Príncipe shrew which we know to be endemic and distinct from the Sấo Tomé shrew, we did find the largest “cobra gita” (house snake: Lamprophis sp.) we have ever seen and from a new locality.  This, too, we know to be a distinct species from the Sấo Tomé Lamprophis, but we have thus far been unable to describe it. This is because there are many species of the same genus on the African mainland, and their relationships are poorly understood. So while we know the two island species are distinct from one another, we cannot guarantee that one or the other (or both) does not also occur on the mainland.

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The Príncipe thumbnail-less gecko H. principensis (Weckerphoto – GG III]

While we were on Príncipe I received word that the description our new species of gecko had been formally published, so above meet Hemidactylus principensis.  Like H. greeffi, its nearest relative on Sấo Tomé, it lacks the thumbnail on the first toe, but otherwise, the two are very, very different.

Dr. Brian Simison’s finding that there are no limpets on either Sấo Tomé or Príncipe is intriguing.  Brian informs me that so far as he knows, Sấo Tomé and Príncipe may be the only oceanic islands that lack them.  They are present on the Cape Verde Ids, the Seychelles, etc.

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Dr Brian Simison at Laguna Azul.  (A. Stanbridge – GG VI)

This leads to the possibility that there may be something in the volcanic rock making up these islands that precludes the presence of these mollusks.

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Recall from earlier blogs that all four of the Gulf of Guinea Islands, plus Mt. Cameroon, the Cameroon highlands and even the Jos Plateau of Nigeria all originated from magmatic extrusions up through a 3,000 km-long linear fissure or rift that transects both the marine and continental parts of the African plate known as the Guinea Line; extrusion of magma occurred at various times from over 60 million years ago to the very recent Holocene continental island of Bioko.

The remarkable towers of both Sấo Tomé and Príncipe which appear in these blogs with such frequency are indeed of a rather uncommon, chemically distinct rock known as phonolite, usually associated with geologic hotspots.

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Príncipe, note phonolite towers and mesa on lower left. (A. Stanbridge – GG VI)

One test of the hypothesis that it is something about the rock that is excluding limpets would be to explore the shoreline of Bioko, the youngest of the Gulf of Guinea Ids and the only continental member of the archipelago.  And as luck would have it, our colleague, Rayna Bell will be working on Bioko in a matter of months.  In addition to looking for limpets on Bioko t the presence or absences of limpets along the Gulf of Guinea coast should be documented. If indeed the rock is unsuitable for limpets Brian would predict that limpets would be found on either side of Guinea Line, but not on rocks produced by it.

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(l-r, Roberta Ayres,  Velma Schnoll, me on, Sấo Tomé (A.  Stanbridge – GG VI)

I devoted an entire blog last month to the biodiversity education component of GG VI, and for all of us involved, this was just joyous. We personally delivered 1,840 endemic species coloring books to third graders in 62 classrooms of 17 selected primary schools on both islands. On the big island the schools were in the districts of Sấo Tomé town, Angolares, Trindade and Neves , and on Príncipe  at Santo Antonio, Sundy, Sao Joaquim, Nova Estrella and Praia Abade.

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Porto Real, “my school” on Príncipe  (V. Schnoll – GG VI)

To say they were well received would be a gross understatement.  Again, we thank all who worked on this project (see March 9 blog: Sharing the Wealth; and for those who made GG VI financially possible, see “Partners” below).  At the adult level, we also gave five lectures on the biodiversity of the islands: two in Portugal and three at institutions on the islands themselves.

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Droo doing his thing on Sấo Tomé ( R. Bell – GG VI)

Andrew Stanbridge (above), our photographer on both GG V and GG VI, is a remarkable person in many ways; much more than just a gifted professional artist.  His website is Andrewstanbridge.com

Here are some parting shots:

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PARTNERS

We gratefully acknowledge the support of the G. Lindsay Field Research Fund Hagey Research Venture Fund of the California Academy of Sciences, (GG I, II), the Société de Conservation et Développement (SCD) and Africa’s Eden for logistics, ground transportation and lodging (GG III-V), STePUP of Sao Tome http://www.stepup.st/, Arlindo de Ceita Carvalho, Director General, and Victor Bomfim, and Salvador Sousa Pontes of the Ministry of Environment, Republic of São Tomé and Príncipe for permission to collectexport specimens for study. Special thanks for the generosity of private individuals who have made the GG III-V expeditions possible: George G. Breed, Gerry F. Ohrstrom, Timothy M. Muller, Mrs. W. H. V. Brooke, Mr. and Mrs. Michael Murakami, Hon. Richard C. Livermore, Prof. & Mrs. Evan C. Evans III, Mr. and Mrs. Robert M. Taylor, Velma and Michael Schnoll, and Sheila Farr Nielsen; GG VI supporters include HBD of Bom Bom and the Omali Lodge for logistics and lodging, The Herbst Foundation, The “Blackhawk Gang,” the Docent Council of the California Academy of Sciences in honor of Kathleen Lilienthal, Bernard S. Schulte, Corinne W. Abell, Prof. & Mrs. Evan C. Evans III, John and Judy Sears, John S. Livermore and Elton Welke. Logistics and lodging for GG VI (Omali Lodge and Bom Bom Island) were kindly provided by HBD.


December 16, 2011

The Race: Our Omali Base and Year’s Odds and Ends.

Year’s end and things are busy, even in Academia. Here at the Academy, we are already in planning mode for GG VI but more on that in coming months. We are awaiting the publication of more of our discoveries, and I will report them here as they appear. In the meantime this is a good opportunity to thank all of you who have helped make next year’s expedition a probability: the Herbst Foundation, the “Blackhawk Gang”, and the California Academy of Sciences Docent Council.

As readers know, our mission is not only to discover and scientifically describe what is on these wonderful old islands but to let others know about it, especially the citizens. But, this also includes the business visitor and tourists primarily interested in fishing or ocean activities. The neat unique critters we are studying are not just isolated up in the higher reaches of the forest; many can be found right downtown. You just have to look.

On the beach of Praia Lagarto, between the airport and downtown São Tomé, lies the Omali Lodge. Originally built by a Mr. Hellinger, I remember it in its original incarnation as the Marlin Beach Hotel, one of the best bars in the islands– a real gathering place. It is small and quite upscale but it retains its original flavor. Folks who know the islands or have been well informed stay at the Omali; it attracts rather fascinating people.

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Omali Lodge. [Photo and toes - V. Schnoll GG V]

The Omali is pretty fancy digs for a bunch of bush biologists like us but luckily, the Omali’s owners have supported our work by allowing us to stay there during our last three expeditions. As comfortable and friendly as the Omali is, the central thing for our work is a dependable power source (although a post-fieldwork dip in the pool is not too shabby!)

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The Omali. [Weckerphoto GG III]

So as a new visitor, if you walk through the foyer and bar out to the back to the pool, you will first be struck by the enormous coconut palms. Ignore them for now; to the left around the back of the kitchen, and behind the rockwork in the pool (above) are several other palm-like trees that aren’t!

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Pandanus thomensis fruit (r) and prop roots (l). [T. Daniel GG III, IV]

These are the São Tomé screw pines, Pandanus thomensis. You can tell them from the palms by the fact that the base of each tree is supported by a number of prop roots (see right, above). Obviously, these are neither pines nor coconuts; the important thing to know is that these trees are found only on São Tomé, nowhere else in the world.

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Trachylepis maculilabris [D. Lin, GG II]

As you walk along the pool, the first quick movement in the grass is likely to be a speckle-lipped skink, particularly common during the heat of the day. These lizards are not unique to the islands but they are very good dispersers across oceanic barriers, and they are found on many of the Atlantic and Indian Ocean islands. Some of our colleagues have looked at the genetics of the São Tomé and Prìncipe skinks and suggest that while they are not endemics, they have been on the islands since long before man arrived.

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Lygodactylus thomensis. [J. Uyeda, GG III]

On the walls surrounding the pool and rooms lives the São Tomé day gecko, Lygodactylus thomensis, which shuttles in and out of the shade in search of insects. Most geckos are nocturnal creatures, but this group is secondarily diurnal. L. thomensis is a true endemic whose ancestors probably reached São Tomé millions of years ago; the same is true of its closest relatives, the Prìncipe day gecko, L. delicatus, and the Annobon day gecko, L. wermuthi.

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Homoptera. (True bug).  [Weckerphoto, GG III

Most of the Omali plants are ornamentals from other parts of the world of course, but this does not mean they do not harbor fascinating species. Our photographer on GG III, Wes Eckerman took the photograph above of a homopteran bug on a bush near the Omali pool. Our entomologists have not been able to identify it beyond the Family Scutellaridae! It is highly likely that an enormous number of the islands’ insects remain to be discovered and described scientifically.

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Common waxbill, Estrilda astrild [Weckerphoto, GG III]

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Blue-cheeked cordon-bleu, Uraeginthus cyanocephala [Weckerphoto GG III]

Bird life around the pool is plentiful and entertaining. The most commonly seen birds in the Omali bushes are various finches and waxbills that are of African origin and possibly brought over from the mainland as pets by the Portuguese colonials (above). But the real specialty is the São Tomé Prinia. Prinias are Old World insectivorous warblers; there are about 30 species divided between Africa and Asia. Prinia molleri is the only member of this group in the islands and it is found only on São Tomé, from downtown all the way to the top of Pico at 2,000 meters. As common and seemingly fearless as this endemic little bird is, it is extremely difficult to photograph. It just won’t hold still.

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Prinia molleri on Omali window sill [Weckerphoto GG III]

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Prinia molleri [Weckerphoto, GG III]

Finally, lying around the Omali pool it is impossible not to notice the noisy action up at the top of the palm trees. Part of the year the palm fronds seem to be inhabited mostly by vitelline masked weavers. Even when they are not around their distinctive nests from the year before are obvious.

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Vitelline masked weaver [Tanzaniabirds phot]

These weavers are native but not unique to the islands although some ornithologists recognize them as a distinct race (or subspecies, Ploceus velatus peixotoi) indicating that they may have been isolated from the mainland long enough to be recognizably different from the mainland species. These weavers are not found on Prìncipe. All who know them would agree that weavers are a noisy group in general.

When we are working on the islands, usually March-May, the weavers are rather scarce and instead, their place in the palm trees seems to be taken up with the large island fruit bat, Eidolon helvum. These large bats are common on the African mainland where they are migratory; the São Tomé populations are thought to be the same species but do not migrate. They are eaten by many local people.

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Eidolon helvum [RCD, GG V]

An hour or so at the Omali pool at the right time of year is enough to learn that Eidolon is a very noisy animal as well. They seem to argue and fuss all day when they should be sleeping; the sight of the entire group flying off to feed at dusk is unforgettable.

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Fruit bats taking off at sunset. [V. Schnoll, GG V]

Bats are a group much in need of genetic study. There are a number of endemic species recognized by anatomical characters, but in most cases their true species status has not been tested molecularly as we have done with the Sao Tome shrew (see earlier blogs). The expert on the bats of these islands is my colleague Dr. Javier Juste of the Doñana Institute in Seville, Spain. In an earlier blog I reported that Dr. Juste was involved in the description of a new pipistrelle bat from Prìncipe – this is not yet published and is based in part on genetics. During the past few weeks, I have sent Javier some images of bats we have taken during past expeditions, and he has kindly tried to identify them for us.

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Principe bats at Nova Cuba [Weckerphoto, GG III]

This is a group of bats we found at the old plantation of Nova Cuba, on Prìncipe. Currently recognized as Hipposideros ruber guineensis, they are thought to be a race of the red bat common on São Tomé but it would not surprise me if further analysis might prove them to be a distinct species.

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Hipposideros ruber guineensis. [Weckerphoto, GG III]

The photo below was taken by Wes during the day, on the ridge above Lagoa Amelia at about 1400 meters on São Tomé. Javier thinks it might be the endemic Hipposideros thomensis.

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Hipposideros thomensis, Lagoa Amelia [Weckerphoto, GG III]

A final note on spiders; two previous blogs this year have dealt with spiders we have found in gardens, one of which turned out to be an endemic species. A few days ago, my colleague Angus Gascoigne of the Instituto Superior Politecnico sent me several photos of the spider below:

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Argiope orb weaver [Manuel Morais]

I took the photos in to our spider experts and they got quite excited. It is an orb weaver of a widespread genus but “this one is really different!” I suppose I should not be surprised, and Angus is collecting more as I write.

For all of you who observe them, Happy Holidays!

Here’s the Parting Shot:

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The Raison d’Etre.

PARTNERS

We gratefully acknowledge the support of the G. Lindsay Field Research Fund Hagey Research Venture Fund of the California Academy of Sciences, (GG I, II), the Société de Conservation et Développement (SCD) and Africa’s Eden for logistics, ground transportation and lodging (GG III-V), STePUP of Sao Tome http://www.stepup.st/, Arlindo de Ceita Carvalho, Director General, and Victor Bonfim, and Salvador Sousa Pontes of the Ministry of Environment, Republic of São Tomé and Príncipe for permission to export specimens for study, the support of Bastien Loloum of Zuntabawe and Faustino Oliviera, Curator of the Herbarium at Bom Sucesso. Special thanks for the generosity of private individuals who have made the last three expeditions possible: George G. Breed, Gerry F. Ohrstrom, Timothy M. Muller, Mrs. W. H. V. Brooke, Mr. and Mrs. Michael Murakami, Hon. Richard C. Livermore, Prof. & Mrs. Evan C. Evans III, Mr. and Mrs. Robert M. Taylor, Velma and Michael Schnoll, Sheila Farr Nielsen, Corinne W. Abel and Mr. and Mrs. John Sears. Our expeditions can be supported by tax-free donations to “California Academy of Sciences Gulf of Guinea Fund”.



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