The aim is to understand how Palearctic-African migrants use and move around the different vegetation zones found in West Africa, ranging from the semi-desert Sahelian region in Burkina Faso to the lush tropical rainforest in southern Ghana, and whether habitat change may impact them on their wintering grounds.
During the temperate winter of 2009/2010, using point count methodology and mist-netting, we recorded migrants along a degradation gradient at five different stations on a north-south transect. In 2010/2011 we plan to re-visit these sites as well as roving further afield to get a broader picture of migrant habitat use.
Today it’s my turn to return to the UK. A brief visit to the GWS office to wrap a few things up, and before long I’m heading to the airport. 10 weeks have flown by but an awful lot has been achieved and learnt. The two study sites have been well and truly established, a total of 13 target birds tagged, and hundreds of tracking fixes have been taken. Habitat has been mapped and some tree species have even been identified! Dozens of other migrants have been caught, weighed and measured, and many more have been mapped on their “territories” at each study site. It’s been a great start to this new phase of the project, thanks in no small part to the brilliant team. To Japheth and Nick for their excellent fieldwork, Oppong for his amazing food and Emmanuel for his help. And of course big thanks to our volunteer Bee, who with Ed is still tracking nightingales for a few more days yet!
Meanwhile as I return for Christmas, Aly and Oumar continue to gather valuable migrant data from the Sahel zone in the north of Burkina Faso. They have completed 3 monthly transect and ringing visits, and will be undertaking round 4 when many of us will be taking our seasonal break.
Plans are to return in January to the nightingales and the wood warblers, so watch this space for the latest in the New Year!
There is again a sense today that there are more birds around than previously. Maybe I shouldn’t be heading back to the UK just yet! It’s certainly something we need to note for seasons to come. It could be that a new wave of wood warblers, such as it appears, would be catchable and taggable. Then again all of these birds may be moulting just as bird 4 was and therefore not taggable, but it would be interesting to find out nonetheless.
Unfortunately however the flights are already booked, and besides of course we are looking forward to seeing our friends and families again in Accra and beyond. Back at the house we’re soon packed and tidied up after our 2 week stay. After a quick call to the landlord we hand things over to the caretakers Christie and Grace, and wish them well for the Christmas season before bidding them au revoir until the New Year
A further 6 individual unringed wood warblers are seen, so 11 in total, plus we manage to trace our tagged birds 2 and 3, still a strong signal from both. 2 nightingales, a spotted flycatcher and a melodious are also detected later on. Throughout the morning, though, the sun fails to break through the haze, a dry, dusty and smoky suspension brought in by the arrival proper of the harmattan winds. Could it be that some of the migrants have also arrived with, or just ahead of, these winds?
Of interest whilst doing the rounds was finding a couple of trees who's bark had been slashed, apparently to harvest the medicinal sap. Plenty of ants and a few other bugs were making the most of the oozing resin.
Communication from Bee at Nsoatre; they arrived back in good time last night to track the nightingales. It seems – not surprisingly – that their bird 1 has vanished. We think that most likely here is that the tag has finally failed, as this was caught around the 10th of November. The other birds are present, but one or two others’ tags may be showing signs of weakening.
After our trapping effort we have to say our goodbyes to Bee and Ed as they head off to look for bird 1 (just on the off-chance that it might be findable without a radio-tag) with a view to being collected by Oppong at the other side of the valley before heading for the nightingales. Japheth, Nick and I go on to search for birds 2 & 3.
Above photo: hairy-breasted barbet
A short while later Nick is collected by Oppong, and the wood warbler field team once again becomes just the two of us! Oppong, Bee, Ed and Nick head off to Nsoatre to hopefully get some nightingale tracking in this evening.
Whilst tracking I decide at long last to take a sample of vegetation to take back to the house - it's a leafy twig from one of the trees used an awful lot by the wood warblers. Fingers crossed for my being able to identify it!
The rest of the morning is spent mapping some habitat, and quite interesting too to discover just how the land is carved up between the farmland, scrubby fallow and the remnant forest. There seems to be more of the latter than I would have previously guessed, with the open arable fields making up less than one third of the land area. Much of the scrubby fallow, however, is impenetrable without a machete, due to the dense Chromolaena stands, so the exact acreage of this we can’t yet measure without more work from January.
News filters through during the morning that Emmanuel and Ed have met up at the airport and are on their way, and sure enough at midday they arrive at the local canteen. Despite being undoubtedly tired, Ed is keen to help out in the field and joins us tracking in the afternoon.
We meet Bee and Nick back at the other side of the valley, and they bring news that there was no signal to be heard from bird 1. In this case we feel that it may well be possible that it has moved on. It is also perfectly possible for the tag to have finally expired, however, some 14 days since it was switched on.
News from poor Ed is that his onward flight from Rome is delayed, so he expects to get to Accra well after midnight. It could be worse though. And it gets worse! Later in the evening Bee learns that his flight is delayed until the early morning, so he is now due in Accra when Emmanuel is due to leave at about 8am – so he’s going to get picked up from the airport and straight into the field tomorrow.
So after lunch at the university canteen in Abetifi, Emmanuel took Chas back to Accra, with his flight back to the UK later this evening. Sad to go I expect, especially with tagged nightingales still roving around at Nsoatre! However, when Emmanuel comes back on Saturday, Bee will then head back to the nightingales for one last week of tracking, along with boyfriend Ed who’s arriving on the 9th. Meanwhile were all looking forward to seeing Nicholas again, who we hope will be joining us in Pepease tomorrow now that he's fininshed his exams.
We pack up from the field and head back to camp, as with 60 days on my visa running out soon, I need to get an extension stamp from the nearest immigration office, which is in Koforidua. And with the nightingale team packing up today and heading to join us, we need to be back sharpish. Meanwhile our landlord Ola is heading off back to Accra, but has very kindly agreed to all 6 of us staying in his house for the night, which is fantastic.
Arriving in Koforidua at the immigration office just after midday, we are told that the officer in charge is absent until 2pm, so we file the paperwork, head for lunch, and return (with fingers crossed - especially seeing as I have handed in my passport!) Back at 2, and thankfully by 3pm all the paperwork is in order, so we head back home. There we meet up with Bee, Chas and Oppong who have already arrived - fantastic to see them all again!
We phone ahead to the local hotel to make sure of our evening meal order, but then as seems to happen every night from about 1830 to 2200hrs, the power goes off. The local hotel has a back-up generator, but they actually call to say this is not working either! We won’t be eating at the hotel, then. Instead we head to Abetifi and have rice and beans by torchlight at Club Afrik. Cheap and not too cheerful! Still, it’s a meal, and I hope a memorable final dinner in Ghana for Chas.
Over the next few days we attempt to catch each morning, and after an hour of trying on each occasion we remain on 3 tagged wood warblers – not one more bird caught. We follow this with the tracking of the first 3 birds, and on the Sunday we also undertake a full survey along the usual transect route.
What was interesting from the survey was the lack of wood warblers seen aside from those that we already knew about and had tagged! In fact, bird 3 was spotted 300m from it’s usual spot without resorting to tracking. We did encounter a total of 5 others, in just 2spots. With 4 of these in one place, the Monday morning netting attempt was going to be right next to this spot.
The final full site survey was carried out after some particularly damp weather conditions, which totally drenched the vegetation, and made the fieldwork a rather wet job!!
Still more incredible creatures have been to visit the Nsoatre team...
Above photo: the view from the house
With Japheth back and our confidence with tracking increasing, we put a net up in a spot where yesterday we saw an unringed wood warbler. And bingo! After a half-hour of playback a bird is caught, and a few minutes later our third radio-tagged wood warbler is released. Brilliant!
On top of this capture success, we manage to see both other birds this morning – bird 1 for the first time!! This was foraging with an un-ringed bird in a bug-filled flowering tree by the river. Not identified it yet, but I think it might be a Berlinia species.
We manage to track and get fixes on bird 3 this evening. Hopeful to actually see it tomorrow!
Aside from tracking today, we have a meeting with the owner of some wholly decent accommodation on the edge of town. Essentially a holiday home/ weekend retreat for himself, he has built some chalets nearby and rents these out to local professionals. He says that sadly there is no free chalet at present, but explains that for our last two weeks we can move into 3 rooms in his own house! Deal done!!
The grounds of our prospective new accomodation
On our way back from fieldwork this evening we were treated to some pretty good views of long-tailed nightjars resting on the track ahead of us. This meant that poor Japheth had to wait a short while in town for us to pick him up. Sorry Japheth!
Above photo: long-tailed nightjarThe nightingale tracking continues anabated. The team now have a full complement of 10 radio-tagged birds, which has become quite a handful to track twice and even three times a day! Bee and Chas have also undertaken some more habitat mapping of the site, and during the course of fieldwork came across this rather confiding African crake:
Above photo: African crake
A second morning seeking out the birds, and we head straight for down into the valley where bird 1 was yesterday. We get a good signal from the word go. We find that the valley is in fact quite grassy and scrubby, demonstrating that we are at the very northern edge of the forest zone, and the southern edge of the savannah. Plenty of farmland at the bottom too, readily irrigated from the river continuing north towards the Volta, from the waterfall we passed yesterday. Wondering whether the bird will be accessible in the dense forest at the head of the valley, we’re pleasantly surprised to find that it appears to be hanging out at the farmland/forest edge. No matter how hard we try, however, we cannot see the bird, but feel we must be within 50m of it. A few decent fixes, and we’re pretty pleased with this so head for bird 2. Little problem finding this one, and we see it in a mixed canopy some 70m away from yesterday’s spot.
Above photo: early morning tracking
Considering our success so far, we decide to up-sticks from the mountain-top and head for the closer accommodation, so we head straight back to camp and start packing. We say our farewells to the caretakers, grab some lunch in Mpraeso, and head for the new guest house.
The afternoon foray into the field is spent in the valley, chasing after bird 1. It appears to have moved within some particularly troublesome shrubby terrain, and we take 2 hours to get 2 fixes, and as a consequence we end up with no time to search for bird 2. We decide that our pm fieldwork in future should start with bird 2, and then get as good fixes as possible on bird 1 from vantage points on the ridge above the valley.
Not a peep from the receiver. A walk up the road and 100m in every direction, and still nothing. Wondering if the bird has moved on already, we decide to switch to bird 2, hoping for some reassurance that at least the equipment is working! Straight away we get a beep in the headphones. Very quickly we home in on the direction of the strongest signal, and make our way towards the bird.
Amazingly after about 45 minutes we not only pin-point the location of bird 2 about 160m from the ringing site, but we actually spot it, replete with colour rings, foraging a few metres above us in a path-side tree. What an amazing feeling! Yesterday we attached the tag wondering if we’d even get a signal from the birds today, and here were are actually watching one of them!! Brilliant.
Next task was to try again for bird 1. Understanding that the range of the tag is about 500m, up to 1km in the best conditions, we resolved to walk 500m in every direction from the ringing site. Should this fail, we’d expand the search to 1km, and then further if necessary. For the first foray off the main East-West track we head south, listening all the while for any signal from bird 1. An occasional switch to bird 2 shows that we can still detect it from up to 650m away, but 500m S of the ringing site, still no bird 1.
A short walk west along the main track we arrive at the village, and ask for a path northwards. We are pointed in the direction of the river, but are told we need a guide. A quick explanation that the Queen Mother has given us permission, and we’re waved on. About 150m after leaving the village, and bingo, I start to get the faintest signal from bird 1. Continuing on past the river, where it disappears underground and emerges at a sacred waterfall, we’re crossing a grassy, rocky plateau – quite unsuitable for wood warblers it would seem. The valley below is wooded however, and this appears to be where the signal is coming from. We find a path down towards the valley, through some farmland, and then further down to scrub on the edge of the forest. At this point the path runs out, so we take a waypoint and a compass bearing towards the strongest signal. We back-track and seek out other vantage points to take bearings, but back on the plateau we find that we’re heading further away from the signal as it gets weaker, and there seems no other way down to the valley. We decide to head back to the village, and from the road we can “circle” round to the other side of the valley, and maybe get bearings from the opposite ridge.
The road runs south-north along the west side of the valley, and the slopes down are farmed and passable via many paths. We find one which takes us to a vantage point overlooking the valley, but still some 500m from where we were on the other side. A good signal from here, and we finally get a good picture from 2 more bearings. Happy with these “fixes”, and with the sun now high in the sky, we head back to our camp on the mountain.
En route through Abetifi we discover a fantastic little canteen in the grounds of the University, amazing value and service, probably cheaper in fact than catering for ourselves! We resolve to take our lunches here, and self-cater for breakfast and our evenings from now on.
After a long morning, we decide that we must move to Pepease tomorrow. This commute is just too long! It will be much more practical for tracking the birds twice daily.
Whilst out tracking the nightingales, Bee and Chas continue to engage with the locals, and the wildlife pin-badges are going down well.
Above photo: Bee with some local kids on their way to help on the farm
Instantly we get a response. First one bird, then another, calling, but not seen, from over the net area. Then a couple of minutes later another two arrive in that first main tree from yesterday. These two drop down towards the net, and the pewing continues. Just a few minutes later, two reappear in the tree, then a third, fourth and fifth are spotted. None are now calling and all are foraging and moving steadily further away from the source of the song. None is calling, however. Not even those that were very vocal at the start. We need to check the net.
Craning a neck around the corner into the net ride, we spot our first trapped wood warbler, and there next to it is a second! Bowled over by this success, we hurriedly extract the birds from the net and return to the car to prep for ringing and tagging.
Above photo: ringing the wood warbler
Above photo: measuring the tarsus
Above photo: checking age and for any moult