GVI Kenya

Category: Cetacean research, Dolphins, Kenya Wildlife Service, Kisite Mpunguti MPA, bottlenose dolphins | Date: Oct 14 2009 | By: gvikenya

Kisite-Mpunguti Marine Protected Area (KMMPA) lies south of Wasini Island (south-coast of Kenya) and covers an area of 39 square kilometres. The KMMPA includes the National Park surrounding Kisite Island and the Marine Reserve surrounding the Mpunguti islands. The KMMPA and the marine wildlife it contains are an important tourist attraction and, as a result, an important resource for Shimoni and surrounding communities. The islands within the KMMPA are surrounded by coral reefs attracting divers and snorkelers to the area. Almost every day dolphin-watching companies operating from Shimoni travel through Wasini Channel to the KMMPA. These tourist dhows most frequently encounter Indo-Pacific bottlenose dolphins (Tursiops aduncus), and less frequently, Indo-Pacific humpback dolphins (Sousa chinensis).

Global Vision International (GVI) Kenya’s main working partner is the Kenya Wildlife Service (KWS). The research conducted by GVI is shaped to satisfy the objectives of KWS, so as to assist them towards better management of the area.  All data collected thus far is made available to KWS to aid in management plans of the study area. The Marine Programme is supporting KWS to collate data by conducting vessel surveys, which was focus on assessing the bottlenose dolphin abundance on the area, during the initial phase.

After three years of cetacean research in Kisite-Mpunguti MPA, GVI has estimated the absolute abundance of bottlenose dolphins around 122 individuals, being the second biggest population of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in East Africa. The largest population of the species inhabits in Kizimkazi (south-coast of Zanzibar), and holds between 139 and 179 individuals (estimation made by University of Stockholm in 1999-2002).  

Photo-id and mark-recapture methods were the methodology used on both studies to get the estimation. Photo-ID refers to the identification of individuals by distinctive features (shape, outline, natural markings and scarring) of their dorsal fins, flanks and flukes. Some scars will be retained through life, whereas others will be added and may fade through life. The depth and severity of the wound will determine the length of time this may be used for identification. These features allow known individuals to be re-sighted. The re-sighting rate can be plotted on a discovery curve, the plateau of which suggests population size. Photo-ID can also be used to determine residency and demographic data such as inter-birth intervals, patterns of ranging and mortality.

Mark-recapture methods are used to calculate population size from the proportion of known individuals re-sighted over the study period. Mark-recapture models estimate only the size of marked individuals in the population. Therefore, the total population size has been corrected by the correction factor.

Kenya Wildlife Service applied a code of conduct in 2007 for the tour operators to follow when manoeuvring around the cetacean species; unfortunately it is not being fully adhered to as it has only recently been implemented. The levels of interaction between cetaceans and the tour operators are not being monitored or regulated in any way. The impact these activities may be having is unknown. In particular, it’s not known whether current levels of dolphin tourism are sustainable for the area. The first estimation of Indo-Pacific bottlenose dolphins in KMMPA will allow GVI and KWS to measure the levels of tourism impacts, analysing the population dynamics of this species.

Tags: absolute abundance, coral reefs, correction factor, demographic data, depth, divers, dorsal fin, identification, Indo-Pacific bottlenose dolphins, inter-birth intervals, Kenya, Kenya Wildlife Service, kisite island, marine programme, marine reserve, mark-recapture, mpunguti island, national park, photo-ID, severity, shimoni, snorkellers, south coast, surveys, University of Stockholm, wasini channel, wasini island

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Category: Cetacean research, Dolphins, Humpback whales, Kisite Mpunguti MPA, bottlenose dolphins | Date: Oct 10 2009 | By: gvikenya

The start of GVI’s marine research this October was certainly an incredible one. As part of the daily dolphin survey we were heading through Funzi Bay towards the Wasini Channel when Nick (our conservation intern/staff) excitedly drew our attention to a potential sighting. To our amazement it was a humpback whale and her calf.

There had been anticipation in the air that such a sighting may occur since the whales were migrating South from the warmer waters of the East African coast where humpback whales breed (during July and August), but no one could have expected it so early; we had been on board for a mere hour and a half.

While the sighting was spectacular, the events that followed demonstrated the challenges of marine conservation in popular tourist areas and the importance of GVI’s work. With minutes two tourist boats had also spotted the whales and, as one would expect, they wanted to get the best view possible. This attention clearly agitated the mother and her calf and they diverted their course away from Wasini Channel. Although it was incredible to have seen such an animal, it was sobering to have seen at first hand the direct impact of tourist traffic on marine mammals. Our humpback whale sighting was not the only sighting of the day to illustrate this…

Not long after having left the mother and calf, we encountered a group of bottlenose dolphins travelling through Kiste Mpunguti Marine Park. Again, we were exposed to the impact tourism is having in the area and the difficulty of balancing much-needed tourism with equally important conservation. We witnessed tourists jumping from their tour boat directing in amongst the group of dolphins. Of course, the possibility of swimming with dolphins is an excellent means of generating custom for the tour operators, but it is detrimental to the dolphins and indeed, it is prohibited by the KMMPA Code of Conduct.

These two sightings were an amazing start to the season’s marine research, but the experience was a stark reminder of the tensions that exist between the need for income gained through tourism and ecological conservation; both of which are vital to the local area and economy. In turn, these tensions demonstrate the necessity of GVI’s work and the value of the data it provides which is used by local organisations to develop solutions to such problems.

Tags: , calf, data, dolphin survey, East African Coast, ecological conservation, economy, funzi bay, humpback whale, marine conservation, marine mammals, mother, tour boat, tourist, wasini channel

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Category: Cetacean research, Humpback whales | Date: Aug 13 2009 | By: gvikenya

On Sunday we were rewarded with yet another amazing sighting of Humpback Whales. It has been the sixth sighting since the beginning of 093 Expedition. This time, a mother Humpback Whale and its young calf were socializing in the channel between Mkwiro and Shimoni, so close to our Base Camp that we were able to see them from the land.

 The mother

It didn’t take us too long to prepare the cameras and GPS and jump into the boat to spend some time watching the pair as they slowly cruised in the channel. They seemed very relaxed in this calm and shallow waters; the young calf was lying on its back showing its distinctive white pectoral fins, while the mother rubbed her body from underneath. We were just overwhelmed by the beauty and the magnificence of the moment!

The calf showing its pectoral fin  

But the main show was yet to come…after a short diving period, the calf breached more than half of its body clearly out of the water just about 30m away from our boat…Whoww! Sunny Sunday Mornings at GVI’s Mkwiro Base.  

The pair together

During the last year (2008) we had a total of 6 sightings of 15 Humpback whales inside our study area. And from the start of July 2009, GVI has already seen 14 Humpback whales in 7 sightings. We are now sharing this data with other organizations collecting data on Humpback whales (a network that involves almost 100 whale-watchers along the East African Coast, from southern Mozambique to northern Unguja Island, Zanzibar) and contributing to have a better understanding of the migration pattern of this species.

Tags: breach, calf, camera, gps, humpback whale, kisite mpunguti marine protected area, mkwiro, mother, pectoral fin, socialising, wasini channel

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Category: Cetacean research, Dolphins, Kisite Mpunguti MPA, Turtles | Date: May 01 2009 | By: gvikenya

Keziah gives us the news from yesterday’s marine research:

I woke up 6am in Shimoni, waiting to find out when the boat would come to pick me up at the jetty. With the rainy season, start times of marine surveys become a wee bit unpredictable - with one eye on the rain clouds you just have to wait for the opportunity! However, the sun was shining, there was no sign of rain and a phone call later I was jogging through Shimoni village to the boat.

We headed out towards Funzi Bay, across Nyuli Reef and to Upper Mpunguti Island when we had our first sighting of dolphins, something that has also become less predictable with the season. At first we thought there were eleven Indo-Pacific bottlenose dolphins, but soon realised this was an underestimation. Ten on the port side, ten on the starboard side, we didn’t know quite where to look, excitedly swapping sides with a chorus of gasps and squeals from our team, and splashes and blows from the dolphins.

Several individuals were identified immediately, including one of my favourite pairs; Besty and her calf. I had the pleasure to be on the boat when we spotted Besty and her newborn calf for the first time, adorably small with the foetal folds still showing! Others including Twende and the yet to be named individual ‘063’ were also identified.

The group were at first travelling fast in a southerly direction, then their pace slowed, with a couple of individuals approaching the boat to bow ride. This enabled us to get good shots of the dorsal fins, which will be used for photo-identification in our mark-recapture study. Unfortunately we also noticed an adult and juvenile that appeared skinny compared to the rest, with their ribs visible. We hope this wasn’t a sign of illness in the population or lack of food in the area… After taking enough photos we left them to continue south to the open sea.

The dolphins had done us a service, leading us to the start of the snorkel transect our survey leader had selected for the day, by Kisite Island… and it turned out to be the perfect day to pick this transect! As we climbed out of the water to board the boat post-survey, everyone’s face was an absolute picture: 3 hawksbill turtles, 5 green turtles and 1 moray eel! Ruth and I even had the pleasure of watching one of the green turtles swim slowly to the surface, stop for a few seconds and then continue to raise its head out the water, beak open for a gasp of air. This was closely followed by us both surfacing and giggling hysterically with joy having witnessed a behaviour in full that we had only seen before from above the surface as a turtle’s head appear and disappear in a second!

With the weather being on our side, we decided to return towards Funzi Bay again, but the sea was just a little too rough, so we diverted in to Wasini channel. Within 5 minutes of turning the boat around there was a shout from Katalin at the front, “DOLPHIN”, followed quickly by “HUMPBACK DOLPHIN!”. We had to wait 10 minutes for the individual to reappear, a very large Indo-Pacific humpback dolphin that seemed curiously darker than usual. We put this down to the glare of the sun, and waited for what we thought was a lone individual to resurface.  Then two individuals surfaced riding a wave, both smaller than the first. Several more minutes of waiting and we were shocked to see not only the three individuals from before, but another two adults and calf!

We continued to watch them for 20 minutes as they were feeding, coming up for several breaths before peduncle dives took them under for several minutes.  After surfacing for the third time, in unison, they formed a compact group, changed direction and headed south, crossing the channel towards Wasini Island. We were able to compare the colouration of the first individual and yes, he was distinctly darker, not something we had seen before. The mother of the calf had a deep scar around her neck, possibly from a fishing line. Only 2 weeks ago an individual was spotted with a huge chunk out the back of his dorsal fin, the shape suggestive of a boat propeller injury. Both these wounds emphasize the humpback dolphin’s vulnerability to fishing activities, boat traffic and marine debris around coast lines. But fortunately also an ability to recover from significant injury.

All in all it was quite an epic day for our research team and for me one of complete brilliance!

Tags: bottlenose dolphin, Cetacean research, dolphin research, funzi bay, green turtle, hawksbill turtle, humpback dolphin, Kisite Mpunguti MPA, turtle research, wasini channel

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