Tuesday, April 15, 2008

A Day of Drifting and the Manatee Hunter

On Sunday I went back up the Congo River, once again hoping to see manatees. By now I’ve started to get a pretty good sense of the area. We go up the main river for about an hour before turning off into a tributary.

Heading up the Congo River from the mouth, in the early morning calm

At the mouth of the tributary is an Angolan navy outpost where we check in. On Sunday a navy guy came over and excitedly told us they had just seen a manatee go by, heading up the tributary. So we motored up a short distance, turned off the engine and drifted, but we never saw it. The river was very deep, 17-22m. We headed upriver past Kibaka and returned to a village called Nzadi Caca. There are actually two villages across the river from each other, all built on large mounds of clam shells. Not surprisingly, the large freshwater clams are the main food and livelihood of the villages in this area. The men free dive as deep as 16m in the river to get the clams, which they tell me the manatees eat as well (they specified that manatees only eat rotten or baby clams, presumably because they can actually get them out of their shells). Clams have been found in manatee stomach samples from northern Africa, so it was interesting to hear it described here as well. Joao bought some clams from the village and I tried one… unfortunately the kindest way to describe the taste was salted sediment.

A village across from Nzadi Caca built on millions of clam shells
Skewers of clams being smoked at Nzadi Caca
Villagers at Nzadi Caca frequently see manatees and were very helpful in describing behaviors they observe. My fantastic translator Joao and I are on the back left, and Mike Carpenter from Angola LNG is also in back (photo credit goes to Mike!).

After leaving Nzadi Caca we drifted downstream for awhile, once again hoping to catch a glimpse of a manatee. But this day was a reminder that we had been incredibly lucky last Thursday, because we didn’t see any all day. However, today there were also a lot more motorized boats heading upstream, all filled with gas drums headed for the Congo.

On our way back down the main river to base, we passed the town where the manatee hunter lives. There were several fishing boats out in front, so we asked a fisherman if the manatee hunter was there. He said yes, he was a short distance away on another boat. He paddled over to us and we were able to interview him (with Joao translating). The manatee hunter is named Sebastian and he has lived in this village his entire life except from 1955-1958, when he was sent to India with the Angolan army. He is an old man now but still hunts both manatees and crocodiles. He showed us his harpoons and net and gave a lot of good information about manatees. Although it is depressing that he is killing manatees, these interviews have to remain completely non-judgmental if I’m going to gain trust and get good information. He does have some bones in his village and hopefully next time I will be able to convince him to let me take samples for genetics.

Sebastian and one of his harpoons. He uses one (with bouy attached) to initially harpoon and then follow the manatee, and he has another 2 harpoons to finish the job.
Fishermen display the manatee capture net.
Joao and I interviewing the manatee hunter (photo: Mike Carpenter)
Manatee Sighted!

Sorry for the silence, the wireless internet has been down here for several days and there was no other way for me to get online.

On Thursday we headed back up the Congo River to Kibaka, one of the first villages we visited on Tuesday. Two men there told us more about the local manatee hunter (luckily there is apparently only one in the region) and also that they had seen a manatee in front of the village just a few minutes before we arrived. I have to admit to being skeptical about the sighting, because I was a bit worried they were just telling us what they thought we wanted to hear. But just a few minutes later Tim spotted a manatee across the river! So we motored up a little way, stopped the engine and drifted with the current. Amazingly, the manatee surfaced 6 more times over about the next hour. This is the first time I’ve actually seen a West African manatee stay in the vicinity of a boat; in Gabon they take off as soon as we see them. So I was able to get a few photos, which will look pathetic if you aren’t a manatee biologist or someone who studies extremely elusive animals. One of the guys here said it looks like a pregnant woman bathing. But there are so few photos of manatees in all of Africa, that being able to get some the first time I see a manatee in Angola is exciting.
Brian & Tim looking for manatees, just a few minutes before Tim spotted one.
Manatee back / dorsal as it makes a deep dive in the river.
Manatee peduncle and tail as it dives (heading left). You can see the distinct outline of the tail vertebrae in the center of the fluke.
I hope the facts that villagers here see manatees everyday, and that our first sighting was such a good one, will mean that manatees are easier to observe and study here, but it also worries me that their visibility makes them easier targets for the hunter.

Wednesday, April 09, 2008

Greetings from Angola

At long last, I am here in northern Angola at the mouth of the Congo River. This study has been two years in the making and is a survey effort for manatees, cetaceans (mostly humpback whales and humpback dolphins) and sea turtles. I am working with WCS colleagues who I also collaborate with for work in Gabon, and I’m very happy to be a part of the team here. We are contracted by Angola Liquid Natural Gas for this project, and this is the first study to integrate sighting, acoustic (for cetaceans) and nesting (for turtles) surveys to assess marine mammal and sea turtle diversity and habitat use in northern Angola.

After a long flight from Houston directly to Luanda (the capital of Angola), I took another flight up to Soyo in the northern part of the country and arrived here Tuesday afternoon. I’m staying at the Angola LNG base, which is staffed by Brits, South Africans, Americans and of course Angolans (I’m sure I’m leaving out a few other nationalities). After briefings about safety and life at the base, and meetings with colleagues (several of whom had finished their work for now and were departing just hours after I arrived), I ate an early dinner at the mess hall and passed out from jet lag.

This morning I headed out onto the Congo River with colleague Tim, Brian and Joao from Angola LNG and two boat drivers. Brian is helping to coordinate all our logistics here (which takes a lot considering the varied needs of a group of people who work offshore, nearshore, in rivers and on the beach with all kinds of equipment). Joao is Angolan and is helping by translating for me when I interview people in villages (because there’s no way I’m going to learn Portuguese! Struggling with French in Gabon is about all my poor brain can handle). It’s the end of the rainy season here, and the heat and humidity are intense, but not unlike Florida in mid-summer. The mouth of the river is 15km wide and has a very strong current that flows at 7-8 knots. As the Safety Officer said yesterday, “Fall in and your next stop will be Rio de Janeiro”. It is muddy brown and has lots of floating vegetation, most of which are favored manatee food plants such as water hyacinth and grasses. We traveled up the south side of the river (the north side is Democratic Republic of the Congo), wound through several smaller tributaries and stopped at a Navy outpost and six villages over the course of the day. Everyone was very friendly and readily volunteered information about manatees. I was surprised to find that almost everyone said they are commonly seen, people in two villages described mating herds, others have seen manatees feeding, and no villages had hunters, although several people knew of manatee hunters that came from further upriver. We also found manatee feeding sign at a couple locations. The upshot is that I’m encouraged that there may be more animals here than I predicted to myself before coming (because of Angola's long war). Hopefully we’ll be able to see some!


Tim and Joao (front), Brian (in back in the tan cap) enjoying a really nice day on the river.
This is an example of a grassy area along a tributary off the main Congo River. Even though the current was strong, it looked like a good place for manatees to feed and had types of plants they are known to eat. About 5 minutes after examining this area, two men living across the river told us they see manatees here almost everyday.
A man at the last village we stopped at, Luamba, drew a manatee in the sand to describe what he has seen.

Friday, March 28, 2008

Manatees In Ghana

Click here to see a nice news article that just came out on Patrick Ofori-Dansen and manatees in Ghana (although the author made a few errors- manatees and dugongs are not the same, manatees do not show their teats when they surface to breathe and although their eyesight probably isn't great, they are not blind). However, I was especially happy to read that Patrick and the Earthwatch team saw 3 manatees last Fall, because he previously told me they never see them during surveys!

Saturday, December 22, 2007

Another Gabon season ends

It has been another wonderful few months in Gabon this Fall, and as always there are many people to thank for enthusiastic support of my work there. First and foremost I thank the Columbus Zoo and Aquarium, Wildlife Trust, WCS – CCRP (Marine Program), the WCS Gabon Program (Africa Program) and the government of Gabon.

In particular, the following individuals provided invaluable support and assistance: Buddy Powell, Cyndi Taylor, Susan Kahraman and Julie Hughes (Wildlife Trust), Tim Collins and Howard Rosenbaum (WCS-CCRP), Lee White, Romain Calaque, Alden Whittaker, Tomo Nishihara, Rich Parnell, Angela Formia, Christian Tchemambela, Josie Demmer, Ruth Starkey and Leonie (WCS- Gabon Program), Rombout Swanborn (SCD), Solange Ngouessono and Augustin Mihindou (Gabon Ministry of Water and Forests), Bas Huijbregts and Bas Verhage (WWF), Christian Otando and Jean-Alain Pambo (Sette Cama Safaris), and John “DeDe” Mboumba (Ibonga).

The fundraising effort continues and I plan to apply for at least 9 different grants this coming year in order to fund GPS tagging/tracking and genetics work to get a clearer picture of manatee population distribution throughout Gabon and throughout the species range (from Mauritania to Angola). This is the next step after the past 2 seasons of preliminary surveys throughout Gabon. Fundraising could be a fulltime job if I didn’t have another fulltime job! But I’ll keep at it because I think the work is important, the species needs all the help it can get, and I appreciate all of you who help me with it.

Photos of a few folks:
Bas Verhage (along with some delicious grilled fish at a local restuarant in Gamba)
DeDe and I in Gamba (yes, I've covered the countryside in WT t-shirts!)

Alden and Angela

Josie and Tomo

Late night happiness at Pongara
On the spur of the moment the other night I decided to join friends Miguel, Josie, Ruth and her 2 friends from England on an overnight to Pongara National Park, across the estuary from Libreville. Pongara has one of the world’s highest densities of leatherback sea turtle nests and right now is the peak nesting season. Some of you may not know that I have been involved with sea turtle research as well as marine mammals throughout most of my career- either as a secondary part of my job or as a volunteer. In Florida I volunteer monitoring Loggerhead nesting from June-October each year, but I’ve never seen a live Leatherback and have wanted to see one for many years.

So we took an afternoon ferry across to Pongara and stayed at a house there that WCS friends kindly loaned us. At 10pm Ruth and her friends headed out to the beach (about a 20 min. walk up to a point where the estuary meets the Atlantic Ocean) and found 2 turtles on their way back to the sea after nesting. They called us back at the house and Josie, Miguel and I set out. Over the next several hours we found 2 leatherbacks nesting and were able to watch the entire process. It was fantastic! Not only are they enormous, but to watch an animal that has existed for literally millions of years nesting so instinctively was fascinating. Well worth going to bed at 3am!

Photo below: digging the nest one flipper-full at a time. Both the turtles we saw were tagged (you can see the silver tag on the right rear flipper below). I found out the following day from my friend Bas that one of them was tagged in 2003 in Gamba, which is several hundred miles south of where I saw her!
Eggs being laid into the nest. The last eggs were much smaller and probably were infertile. You can see one of the larger (normal size) eggs on the right side of the photo below.
Josie, Miguel and a nesting leatherback.

Heading back to the ocean after nesting. She will lay several clutches of eggs during the nesting season.

Friday, December 14, 2007

Kalahari
What do marine biologists do for vacation? They go to the desert! I just spent a fantastic week in the Kalahari Desert at Kgalagadi Transboundary National Park, which is in the northwest corner of South Africa and includes portions of Botswana and Namibia (hence the name). A group of 8 of us drove up from Cape Town (15 hours) and stayed at three different parts of the park... at each site we stayed in nice bungalows complete with BBQ grills, a pool and in 2 cases a blind overlooking a waterhole. We saw fantastic wildlife every day, so I'll mostly let the pictures speak for themselves:
We saw lots of Oryx (Gemsbok) and not surprisingly this was originally named Gemsbok Park.

Lioness resting in the shade right by the road.Springbuck. These were everywhere in large herds. They do gorgeous leaps when they run.

Wildebeast herd too shy to come all the way in to the waterhole.
Giraffes were re-introduced to the park a few years ago, so we are lucky to have seen about 20 of them. They were definitely one of my favorite animals there. So graceful!

Pale Chanting Goshawk. We sw lots of these birds and they often feed cooperatively with honey badgers. We saw 2 honey badgers at night with a cobra they had killed, but I wasn't able to get a photo. Spotted Hyena eating a Red Hartebeast carcass; there were actually 4 hyenas at this kill.
We saw lots of Black-backed Jackals throughout the park. They reminded me of coyotes and were really neat animals.Kori Bustard, a very large and very cool bird.
Kalahari Tortoise, which is pretty rare.
A group of ostriches at a water hole. The ones laying down are having a giant bird bath.
An Oryx carcass in the road. We saw lots of carcasses, some from kills, some (mostly Eland) that had died as the result of dehydration during the dry season.
Yellow Mongoose
Sunset over the water hole at Nossob.
Our very fun group at breakfast! Gill, Sal, Hilde, Tim, Ken, Marco and Christina. Definitely the trip of a lifetime.