29 July 2007

A special day at Kalamos


“Date 26th of July, time 8:17, seven people on board, starting point Episkopi, sea state 3” were the very first research data collected after two days of strong wind and rough sea. We decided to follow route B in the clockwise direction. This route passes south of the island of Kalamos.

After having checked the Mytikas fish farm, we started the survey. All eyes were scanning the irregular sea surface for dolphin fins. A large number of birds were following fishing boats as fishermen discarded fish bycatch at sea. One hour later big splashes attracted our attention; we approached carefully and we noticed the presence of seagulls inspecting the sea surface broken by large fish catching their prey. We started again our survey and a few minutes later a small zig-zag movement on the sea surface was detected. A swordfish! We were surprised about this event, as in the last years sightings of this species of fish have declined. Swordfish, tuna and common dolphins have become increasingly rare due to overfishing of their main prey. This encounter prompted us to restart the survey with more interest and attention.

After another two hours we stopped briefly in a nice village on the island of Kastos. Just before approaching the harbour, water turbolence and foam were seen: a fish school jumping out of the water. A school of small tuna about 50 cm long was chasing other fish during spectacular predatory events. Occasional races, jumps and rapid movements in a feeding franzy. In a few minutes the group dispersed and we were left with the emotion of a wonderful experience. During our coffee break we could feel the intense emotion of these encounters. Then the survey started again.

Annalise Petroselli and Silvia Bonizzoni

28 July 2007

Ionian Dolphin Project, 15-21 July 2007


Before I came to Kalamos, I did not really know what would wait there for me. And then, after a short trip on the inflatable, I saw it - a small village called Episkopi, with “our” base up on a hill. From the first moment, it looked comfortable to me. We got a quick tour through the house, interesting information and a really good dinner. So - the week could start. Early in the morning - breakfast. And then, right on the first day, we had our first sighting: we had the opportunity to see a swordfish and some tunas feeding at the surface. This was an exciting sight, but it should even get much better!!

Two days later, we (that means: Silvia, Annalise and five volunteers including myself) went near Lefkada - and on the way home there came the shout we have been waiting for: “dolphins in sight!”. Common Dolphins. I could see them, not far from us. Three adults and one juvenile. Silvia and Annalise started at once to do their work - our first sight!!! Exciting!

One got the NetPad (a palm-top computer), two others the equipment for timing respiration intervals. I was one of them ;-) Now we tried to find the difference between individual dolphins - something special on their fin - and focussed on one with a “notch” in it. To tell the truth, it wasn't very easy to follow one individual with the stop-watch. But we tried to do it as best as we could...

It was really amazing to see how they move, how elegant and smooth they slide into the water - come out again - start a new dive... You never know, what they will do next - a quick respiration, a long dive, a jump???

I cannot really tell why, but it is so satisfying to see them in their natural enviroment, to see how they interact and move... I still have the picture in my mind, when they were diving directly under our inflatable - so smooth and calm... You could see their colours, their eyes, their fins. It seemed like as if they knew, what we are doing - watching them. And they watched us as well. To follow one individual, to watch him and find out what he is doing - really fascinating and exciting!

That day got even more perfect as we saw another group of bottlenose dolphins, swimming near a fish farm. Two sightings in one day - we have been sooo lucky! And it was really great!

But not only the sightings made this week nearly perfect - almost evrything fitted together. Seven different people - everybody with other roots and expectations - but all being there for the same thing. Even though it was work, we had fun and a great time, and some really exciting days out at sea.

Thanks to everybody that made this project possible. And a lot of thanks to “our” researchers and to “OUR DOLPHINS”!!! ;)

Eva, Austria

24 July 2007

Dolphins of Greece, July 2007


I truly enjoyed my time at the Dolphins of Greece expedition in the Amvrakikos Gulf. I was impressed by the dedication of Giovanni, Joan and Susie to their research, the dolphins, education and to us the volunteers. The team provided us with an opportunity to fully participate in the process vs. just being observers. The most exciting and rewarding parts were being out on the boat and being part of the combined, orchestrated effort to efficiently and accurately record the data and then getting to come back in the afternoons and see what happens with all the pictures taken. Who knew each of the dolphins’ dorsal fins are so different?

The experience was powerful for me personally, as the last time I had really thought about science was in my high school biology class (more years ago than I will admit), and this gave me the rare and special opportunity to learn and be educated in a way that I otherwise would never experience. Giovanni, Joan and Susie took the time to impart their knowledge to us with lectures and videos giving us the great opportunity to ask questions and discuss issues in an intimate setting.

The icing on the cake was the beautiful setting of the gulf, from the sunrises and sunsets, being out on the water and getting the chance to jump in after a long hot day.

The experience was truly remarkable.

Jenny, USA

30 June 2007

Dolphins of Greece, June 2007


Heat. Stifling heat is my strongest impression of this eye-opening week in Vonitsa with Joan (PI), Malvina, and Suzie, as well as my three fellow volunteers Caryn, Michael, and Jonathan. Heat defines our daily rhythms, robs us of good sleep, and offers us the authentic Greek experience. Early mornings are warm, sometimes slightly cool, before the thermometer starts its inevitable climb. We are on the water from 8 to noon, which is exhilarating and our tasks commands our complete attention (more on this below). When we return to the wharf, however, the sun has baked us and the breeze generated by the motion of the inflatable (if no other air movement exists) vanishes. We repair immediately to the Remezzo each day for beer, frappe, coke, iced tea, and cold water to rehydrate our bodies, compare notes, and share glimpses of pictures on our digital cameras.

Returning to our Earthwatch quarters, we prepare and eat a lunch of fresh salads and pastries, then knock off all activity until 4:30 p.m. Like the shopkeepers and public servants, we simple shut down for a few hours and endure the heat by doing as little as possible. By late afternoon, we pick up our pace and work under the direction of Joan, Malvina, and Suzie, cropping photographs taken in the morning, matching individuals with master files using their fins and scars (much like finger print matching or tree ring studies in dendrochronology). Fascinating. As the afternoon proceeds, we receive instruction from our three staff members, see videos about dolphins, other sea mammals, and the state of the world fisheries. These are invariably excellent, though some are inspiring while others deeply disturbing. They all inspire both reflection and conversation.

In pairs, we take turns cooking the dinner meal, swabbing the bathroom, and enjoying a little free time. By 9 p.m. the air has cooled enough to open the big windows and shutters over the dinner table and hope for a breeze. Sometimes we get it, sometimes we get mosquitos instead. Whichever is the case, the seven of us sit down for dinner together around 9:30. This is our land-based highlight of the day, as our conversations range from one or us to another—with each of us sharing something of our own knowledge, cultures, families. We all pitch in after the meal to clean up the table, wash the dishes, and do whatever else needs to be done for our common welfare. No slackers here, and much appreciation is expressed throughout the day for what others are doing. In less than a week, the seven of us have created a new micro-community in Greece from four distinct national backgrounds.

The heat remains. It has helped bond us, even as it oppresses us as each night darkens into blackness. Some nights we go over to the seaside for a beer to cool off before bed, other nights we simple collapse on our bunks, adjust the oscillating fan so that it hits each one of us occasionally, and doze into a pleasant unconsciousness that is punctuated intermittently by an awareness of sweat unevaporated by the fan´s persistent but meagre effort to cool us. By morning, on most days, I awakened about dawn (6 a.m.) freshened by the night air. Never have I understood the Mediterranean cultures as I do after a week in Vonitsa. I am grateful to have experienced it in the record-breaking late June heat that has defined our days here. We are living here authentically, without air conditioning. For that matter, we have also lived this week without municipal water for a day, for an hour or two one afternoon without electricity (no fans!), and without internet service in the town (which, for several days now the local café has told us “Perhaps tomorrow”).

Now for the dolphin research itself, the purpose that brought us together in Vonitsa. I have revelled in our days on the Amvrakikos Gulf in the inflatable boat with 100 HP Yamaha engine. We have seen dolphins in many moods, at very close range and sometimes in considerable numbers. We have photographed them for scientific purposes (even tried out Joan´s splendid camera and lens ourselves), counted them, helped collect skin swabs for DNA work, skimmed fish scales after their feeding frenzies, and learned the techniques for tracking them, counting them, and all the rest. I will leave with high respect for the practical skills as well as the scientific precision necessary to do this work in a way that commands respect among both scholars and public policy makers. Most important, however, I will leave with an abundance of new knowledge that will enable me to become an enlightened consumer of seafoods (which I love) and a determined advocate of sustainable fishing practices and the establishment of fish preserves worldwide. Thank you Joan, Malvina, and Suzanna, thank you Giovanni and Tethys, and thank you Earthwatch! This is my first Expedition with Earthwatch and it has lived up to my best hopes.

Final reflections: I have been a desert or mountain dweller in Utah and other parts of the American west for most of my adult life. So much is transferable from the issues we face there. Instead of dolphins, whales, tuna and swordfish, we fight for the survival of Grizzly Bears, Wolves, Mountain Lions, and California Condors. Like the multi-generational fishing families here, it is often the ranchers there who have a compelling culture, many rare and robust skills, and a distinctly hearty attitude about living. They, too, or educable (as are we conservationists, we hope) and we are finding increasingly common ground in protecting the natural world in its fullness. Mutual understanding based on hard-won trust and respect, and shared knowledge are the touchstones on which we must build a sustainable future for life on earth. We are closer to “Do or Die” than any of us probably know.

Jack

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From our seaside loft in Vonitsa, you can see the Amvrakikos Gulf, where we spend our mornings on the inflatable in search of bottlenose dolphins to study. There is bright sunshine already when we walk down to the dock to load the boat. The town is waking up while the fishermen are just coming in, unloading their catch and readying their nets to set again in the evening. The Gulf looks calm most mornings and we hope it stays that way to make it easier to spot the dolphins, because that’s when the fun starts...

We’ll all be scanning the horizon and someone will yell, “dolphins in sight!” Our P.I., Joan, confirms the sighting, guns the engine and we’re off. Against a backdrop of mountains that rise out of the water, an old castle on the town hilltop, and groves of olive trees along the distant coastline, we are excited to be racing to see our first dolphins of the day. You could watch them all day, every day, if Joan had enough fuel, but there’s work to do. Whether it’s spotting dolphins to be photographed, recording dolphin behavior, timing dives or testing water quality, everyone has a role to play to make sure that the data is collected accurately for later analysis. Joan and his assistants, Malvina and Susie, help him collect fish scales for prey identification and dolphin skin swabs (not to worry – it’s non-invasive) for genetic analysis. Most times it’s very hard to remember the scientific work when a dolphin is swimming so close to the boat that you can see him looking right at you. Or when dolphins are leaping into the air and you just want to stand up and clap and say bravo!!! Or when you are lucky enough to see a newborn dolphin learning how to swim alongside its mother. The dolphins are absolutely spectacular. I know that at the end of this incredible week, I’ll leave Vonitsa with optimism for the future of these dolphins because of the efforts of the people who work so hard to protect them.

Thank you, Joan, Malvina, Susie -- for everything! Adios, Posi!

Caryn

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I must start by saying this trip was amazing. With this being my third EarthWatch expedition this trip altogether has exceeded my previous standards and expectations. We had a great group of volunteers as well as leaders. Joan, Malvina and Susie all did an excellent job of conducting the research while at the same time organizing all the volunteers to do their part as well. Jonathan, Jack and Caryn were an entertaining and pleasant group of people to be with. With everyone’s mixed backgrounds and cultures we got along very well and we all seemed to acclimate to the Greek culture’s relaxed lifestyle! And we can’t forget about the dolphins! It was unforgettable being out in the water studying the dolphins and their actions in person, then learning more about them with the videos and documentaries. My view of our world has changed in a positive way and I am more aware now of the dangers to life out there and what I can do to help. I would like to thank Joan for being a great PI and friend to us all. I know that all your hard work is respected and will be beneficial to changing our environment for the better. As for Malvina and Susie, good luck on your future schooling and thank you for an amazing experience. You guys were all great!

Michael

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“To the dolphin alone, beyond all others, nature has granted what the best philosophers seek: friendship for no advantage. Though it has no need at all of any man, yet it is a genial friend of all and has helped many.”
-Plutarch

“No creature is diviner than the dolphin;
For they once were men living in cities together with mortals.
But by the devising of Dionysos they changed land for sea
and took the form of fish,
And their righteous human souls preserve human thoughts and deeds.”
-Oppian

Great week A perfect balance of fieldwork in the morning, minilectures and videos in the afternoon, and socializing and hanging out in the village in the evening.

I love the village. Seems unchanged from traditional pretourist Greece. At 11 pm people of all ages are out walking along the waterfront, sitting at cafes, eating, drinking, smoking, socializing. Parents actually talking to their children. Kids swimming at the beach in the heat of the day. Every day and evening seems to be the same.

As a zoologist and amateur classicist, I found this a wonderful opportunity to try to see dolphins as the ancient Greeks did. The Greeks loved dolphins for their beauty, speed, sociability, kindness to their young, and friendliness to humans. Many stories of people saved from drowning by dolphins. A sea voyage in ancient times must have been a frightening experience. The sailors might rob you or sell you as a slave or the ship could sink and you would have no chance to survive... unless rescued by dolphins. The belief that dolphins rescued people may have arisen from the fear of drowning together with observations of apparently friendly behavior of dolphins toward humans---approaching and swimming alongside ships, bow-riding, turning their heads to look at people on board. And also the observation that they helped each other when one of them was wounded.

Thanks to Joan, Malvina, and Susy for making this a very successful week and to Jack, Michael, and Caryn for being such good companions.

Jonathan

28 June 2007

From the IDP guestbook (June 2007)

"Leaving Episkopi, the time is 8:30 and we are positive!” that is how the first day on field started. But then it was the thrill of the search, the eyes surveying the horizon and then the voice of Annalise “there”. Heartbeat rises, the preparation for the data collection and finally we see them up close. It is that particular moment where everything seems perfect. That moment when you feel complete happiness, alive, full and at the same time so small. That particular time that all the words can not describe. Keep on smiling guys they know you re there for them. Thank you! C u soon.
Evi (IDP 03)


I don’t want to descend into clichés about it being a ‘magical’ experience or other such nonsense. It was quite simply a brilliant week, spent with great company, learning a lot more than just about dolphins. The dedication of Stefano and Annalise to the project and to making their guests welcome is beyond compare. It has been a truly memorable experience, making we realise how shallow and empty my life at home is!!!!!
Simon (IDP 04)

09 January 2007

Dolphins of the Ionian Sea


this article was written on April 15th, 2006, during the first Earthwatch expedition managed by the Tethys team in the Amvrakikos Gulf, Greece

It is mid April in Vonitsa, a very quaint village on the southern shore of the Amvrakikos Gulf. We have been surveying the Gulf for five days and have sited dolphins in groups ranging from two to six, but the sea conditions have been quite temperamental. Above sea state 3 it is very difficult to spot emerging dorsal fins with the naked eye. However, today we head out in our NovaMarine RIB at 08.30 hrs to our most easterly transect in glass-like waters with the sun shining over the mountainous landscape.

Seconds after reaching our transect starting point, Silvia Bonizzoni, Research Team Member, shouts ‘OUT, 11 O’CLOCK!’. A dorsal fin has been spotted approximately 100 metres from our boat. The PI, Joan Gonzalvo, takes a GPS reading of the first sighting and then approaches the dolphin spotted. The team gets prepared to start recording data. Marisa, HSBC fellow from Brazil, has the electronic NetPad ready to start inputting dolphin behaviour; Helen, US volunteer, is handed the stopwatch to try and time the longest dolphin dive; her daughter Jena, and I are positioned to spot any other surfacing dolphins and Marcia, another HSBC fellow from Brazil, is ready to log our GPS location every minute.

At closer range we spot many dolphins; ‘OUT, 3 O’CLOCK - TWO’, ‘OUT, 7 O’CLOCK – FOUR’, ‘OUT 12 O’CLOCK – THREE ADULTS, ONE JUVENILE’. We are quickly surrounded by these beautiful creatures and the team tries its best to estimate a total group size, but struggles to stay with our focal group, as the dolphins merge in and out of clusters. We estimate over 30, mostly adults but we also spot some juveniles and calves. Some fins are easily recognizable, with many nicks or clear white markings. Silvia and lead PI, Giovanni Bearzi, have been studying the photo-id of these animals for 5 years and easily recognize some of them as they emerge. Ones with very distinctive marks have been affectionately named, such as Pita, who has had the tip of his dorsal fin chopped off, and Elikas (meaning propeller in Greek), who has a large gash behind its dorsal fin from having had an accident with a boat propeller, possibly from bow riding.

The timer rings after 5 minutes and it is time to start recording the dolphins’ behaviour. Some surface feeding is happening which explains the large flock of seagulls crying above our heads. The gulls often follow the dolphins and therefore can act as good indicators when surveying for cetaceans. Some individuals become curious and start to approach our boat, the team becomes very excited as a few begin to bow ride, turning on their sides as they approach to get a better look at us looking at them. In the distance, some are showing signs of social behaviour by leaping great distances out of the water together, and occasionally we see and hear percussive behavior as they belly flop on their sides against the surface of the ocean. With so many dolphins it is hard to keep up with all of the interactions and activity that is occurring but it produces an unforgettable experience for all onboard.

Throughout the hour of recording behaviour and counting group size, Joan has been busy capturing photo-ids of the surrounding dolphins. There is a real art to capturing that perfect picture. The light has to be right, there can’t be too many splashes to hide the markings of the fins, and the best shot is when you catch them leaping with dorsal fin and belly in view, so that you are able to sex the animal later. You can never tell if you have taken the perfect shot until you analyse the photos when you return, so Joan continues to photograph all emerging fins and finishes with 210 images.

We stop survey at 12.00 hrs and start to return back to base after an action packed and awe-inspiring day. The next step after lunch is to crop all of the photos and try to match them against an existing catalogue of individuals. This can be a time consuming but rewarding task when you identify your animals seen that day.

The day ends with a delectable dish prepared by the Brazilian fellows, some authentic Greek wine and sweets. The group camaraderie makes the whole experience even more enjoyable, with wonderful discussion of the day’s events.

We have another early rise tomorrow at 07.00hrs so everyone heads to bed and falls asleep listening to the friendly local Greek villagers enjoying their small town night life on a Saturday night. It is hard to believe that there is only one more survey day left.

Jen Alger

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For more information on Earthwatch expeditions click here

18 December 2006

Working with artisanal fishermen to protect the Amvrakikos Gulf


I first joined the Tethys team in 1999. In 2004 Giovanni Bearzi, President of Tethys, suggested that I moved to a village on the coast of the Amvrakikos Gulf and I settled there to start a year-round study of local dolphins. My decision to move from my home town Barcelona, Spain, to the village of Vonitsa, Greece, was a difficult one. However, I soon realized that this could open the door to significant developments, which were unlikely to occur as long as we operated in Greece as “visitors”. Soon after I settled there, a friendly relationships developed with the local community, especially with artisanal fishermen.

Since the beginning, local fishermen were curious about the presence of biologists from abroad and started inquiring about our work. When we told them about our interest in dolphins, comments were ironic and sometimes slightly aggressive. Some fishermen claimed that dolphins had to be all killed because of their habits of damaging and depredating fishing gear. However, in the end even those attitudes evolved towards a genuine appreciation of our work. Fishermen started to ask questions about the methods we use, our past experiences in this field, our findings and, at a more personal level, they wanted to know the reasons and motivations that led me to choose this profession and way of life.

Establishing a good personal relationship with them and being introduced to the problems they face offered insight that would be difficult to obtain otherwise. While sitting at seaside bars drinking our “café frappé” (ice coffee, a favourite refreshing beverage in Greece), they told me about ever-decreasing landings caused by human impact, illegal fishing taking place in the area, and the actual hardships of dolphin-fisheries interactions.

Their interest in collaborating became even clearer when fishermen started to report dolphin sighting or stranding events. Fishermen who had found a dead animal offered the possibility of taking us there with their boat. They even waited patiently under heavy rain while we were measuring the animal and taking photos.

An understanding of the factors threatening the Amvrakikos Gulf is somewhat complicated as a variety of problems - including chemical pollution, eutrophication and illegal fishing - are contributing to ecosystem damage. Still, local fishermen have come to a good understanding just out of their own experience, without knowing about the conclusions of many scientific articles focusing on this area. Many fishermen, for instance, do not think twice when asked about the problems of the Gulf. And - surprise - the main problems do not include dolphins.

Fishermen maintain that the progressive reduction of the narrow channel that links the Gulf to the open sea (resulting from a project to enlarge the port of Preveza) has had a major impact on water balance and the ecosystem. Water exchange was reduced and this contributed to increasing eutrophication. Changes in freshwater input from rivers due to hydroelectric and other dams also added to the problem. Another serious problem reported by local fishermen is that of illegal trawling (a fishing method that is forbidden in the Gulf since 1975) - reportedly one of the main factors behind the steady decline of fish captures.

The local fishing community also shows signs of the phenomenon known as “shifting baselines”, described by fishery scientist Daniel Pauly in 1995. As one generation replaces another, people's perceptions of what is natural change to the extent that they no longer believe historical anecdotes of past abundance or size of species. The environment changes dramatically, but due to loss of information and memories across generations most people do not realize the extent of change. Therefore, recording fishermen’s present and past experiences represents an important opportunity to document the history of the Gulf’s ecosystem.

For instance, young fishermen admit that a few years ago their catches of sardines, red mullets and shrimps were much larger. Old fishermen tell an even more interesting story. Barba Yannis, who is 74 (the prefix “barba” is used in Greece to express respect for the elder), and Barba Mihalis, 75, have been fishing in the Amvrakikos Gulf for more than 50 years. Both of them recall a time when large tuna were frequent in the Gulf, and tell stories of amazing biodiversity and plentiful catches. Younger fishermen, on the contrary, have never seen a single tuna in the Gulf.

At dusk, while walking along the sea side of Vonitsa with the dolphins seen just a few hours earlier still on my mind, I watch the silhouette of Barba Yannis setting his nets while hand-rowing his kaїki in the magnificent sunset. Not so long ago, this was a common sight in the Mediterranean. Today, artisanal fishermen are yet another “species” struggling to survive in an ecosystem that has been depleted by commercial and illegal fishing. I again realize that Barba Yannis, Barba Mihalis and their sustainable fishing means deserve to be protected as much as the dolphins.

Joan Gonzalvo Villegas

09 December 2006

Coastal Dolphins of the Mediterranean



Coastal Dolphins is a short QuickTime video featuring the decline of dolphins in Mediterranean coastal waters. To see the video please visit:
http://www.tethys.org/coastaldolphins/

05 December 2006

The decline of common dolphins around the island of Kalamos, Greece


Seeing common dolphins bowriding and surrounding our research boat from all sides was a frequent event around the island of Kalamos. When I first moved to study dolphins in western Greece, back in 1996, these magnificent marine mammals were so abundant that one could frequently spot them from the coast, or even from the patio of our field station.

Tuna and swordfish were equally abundant, and from a distance it was sometimes difficult to tell a school of foraging tuna from a group of foraging common dolphins, as both animals performed a similar behaviour when catching anchovies and sardines near the surface. The sea was full of life, and navigating those waters was an endless source of wonder and excitement for pleasure boaters and researchers alike. The situation was so special that the area, one of the few in the central Mediterranean containing key common dolphin habitat, was declared a EC Site of Community Importance. This designation was expected to result in a commitment to protect the local resources and prevent habitat degradation.

However, only a few years later common dolphins around Kalamos had become a rare sight. Tuna and swordfish also vanished. What caused such a quick decline of high-order marine predators in this portion of the eastern Ionian Sea?

Support provided by OceanCare and WDCS - the Whale and Dolphin Conservation Society, was essential to answer this question. These organizations offered financial means and much encouragement to work hard and identify the threats affecting dolphins in the area. Was it pollution? Collisions with speedboats? Intentional killings? Interactions with fisheries? Pathogens?

More than a decade of intensive research at sea and much data analyses done by personnel from the Tethys Research Institute suggest that the main cause of common dolphin decline is overfishing of their prey. Purse seine nets, in particular, seem to be responsible for the local overexploitation and depletion of epipelagic stocks of sardines, anchovies and other fish that make the daily diet of common dolphins, tuna and swordfish. Prey depletion has been so intensive and continuous that large marine predators such as common dolphins can no longer find easy prey.

To face scarcity of food, common dolphins started dispersing and roving. Their formerly large groups broke up into smaller units, which became increasingly sparse. Between 1997-2004, common dolphin encounter rates declined 25-fold, possibly as a result of reduced reproductive success and increased mortality in an area that - as far as prey availability was concerned - had turned from paradise to hell.

Problems caused by prey scarcity summed up to entanglement and mortality in fishing gear, as documented by dead dolphins found stranded or adrift and showing amputations. Today, only a few common dolphins can still be found in the area, and this brings a feeling of sadness to those who have seen them thriving until only a few years ago.

The decline of common dolphins in the area of Kalamos flashes a red light for the conservation of the Mediterranean population. Once one of the most common cetacean species in the Mediterranean, common dolphins have declined throughout the region during the last 30-40 years. Conservation problems for the species have been recognised since the 1970s, but at that time there was little information about cause-effect relationships, as few were recording information at sea about population status and threats. After the turn of the century, however, threats affecting the animals became progressively clear. These basically included incidental mortality in fishing gear (also known as “bycatch”), habitat degradation and prey depletion caused by overfishing.

In 2003 the Mediterranean population of common dolphins was classified as Endangered in the IUCN Red List of Threatened Animals. In 2004, ACCOBAMS - the UNEP's Agreement on the Conservation of Cetaceans of the Black Sea, Mediterranean Sea and contiguous Atlantic Area - presented a comprehensive 90-page Conservation Plan for Mediterranean common dolphins, providing a detailed description of actions needed to protect the animals. Finally, in 2005 the Mediterranean population of common dolphins was included in Appendix I of the Convention on the Conservation of Migratory Species (CMS) as a consequence of their threatened status.

Have all these institutional steps contributed to making life easier for Mediterranean common dolphins? So far, they apparently haven’t. Despite all the expressions of concern, recommendations, strategic planning and scientific background produced, no relevant action has been taken that may result in common dolphin recovery in the region. Sadly, the threats which are thought to be causing decline are continuing to jeopardise the survival of relict groups such as those found around Kalamos, and the Mediterranean population at large.

Scientific research, conservation action plans and declarations of intents by the concerned Governments do not seem to suffice to reverse the present trends. Much public awareness actions, and attempts to define and communicate practical solutions to local problems are also essential.

Giovanni Bearzi

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For more information:

Bearzi G., Reeves R.R., Notarbartolo di Sciara G., Politi E., Canadas A., Frantzis A., Mussi B. 2003. Ecology, status and conservation of short-beaked common dolphins (Delphinus delphis) in the Mediterranean Sea. Mammal Review 33(3):224-252.

Bearzi G., Politi E., Agazzi S., Bruno S., Costa M., Bonizzoni S. 2005. Occurrence and present status of coastal dolphins (Delphinus delphis and Tursiops truncatus) in the eastern Ionian Sea. Aquatic Conservation: Marine and Freshwater Ecosystems 15:243-257.

Bearzi G., Politi E., Agazzi S., Azzellino A. 2006. Prey depletion caused by overfishing and the decline of marine megafauna in eastern Ionian Sea coastal waters (central Mediterranean). Biological Conservation 127(4):373-382.

04 December 2006

Pristine?



The problem of "shifting baselines" and the damage caused by overfishing is featured in the excellent educational slide show posted at:
http://www.shiftingbaselines.org/slideshow/index.html