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Irish Dolphins May Have a Unique Dialect

Irish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other. The Shannon Dolphin and Wildlife Foundation (SDWF)1 has been studying a group of up to 120 bottle-nose dolphins in the River Shannon2 using vocalisations collected on a computer in a cow shed3 near the River Shannon.

As part of a research project, student Ronan Hickey digitised and analysed a total of 1,882 whistles from the Irish dolphins and those4 from the Welsh dolphins on a computer and separated them into six fundamental whistle types and 32 different categories5. Of the categories, he found most6 were used by both sets of dolphins7 — but eight were only heard from the Irish dolphins.

“We are building up a catalogue of the different whistle types they use and trying to associate them with behaviour like foraging, resting, socialising and the communications of groups with calves,” project leader Simon Berrow said. “Essentially we are building up what is like a dictionary of words they use or sounds they make.”

Berrow, a marine biologist, said the dolphins’ clicks are used to find their way around and locate prey. The whistles are communications. “They do a whole range of other sound like barks, groans and a kind of gunshot,” he said. “The gunshot is an intense pulse of sound. Sperm whales use it to stun their prey.”

“When I first heard it I was surprised as I thought sperm whales were the only species who used it. We can speculate the dolphins are using it for the same reason as the sperm whales.” Borrow said.

References in local legend8 indicate there have been dolphins in the Shannon estuary for generations and they may even have been resident there as far back as the 6th century9.

They are regularly seen by passengers on the Shannon ferry and an estimated 25,000 tourists every year take special sightseeing tours on local boats to visit them.詞彙： Irish /5aiEriF/ adj.愛爾蘭的 socialise /`sEJFElaIz/ v. 社交，交往 dolphin /5aiEriF/ n.海豚 bottle-nose dolphin n.寬吻海豚 sperm whale巨頭鯨 click /klik/ n.咔嗒聲，喀嚓聲 estuary /5estjuEri/ n.河口，江口 vocalisation /9vEJkElaI`zeIFEn/ n.發聲 shed /Fed/ n.小屋，棚 digitalise v. 使數字化whistle /(h)wisl/ n.嘯聲 forage /5fCridV/ n.搜尋(食物) prey /prei/ n.被捕食的動物 gunshot /5^QnFRt/ n.射擊聲 groan /^rEun/ n.呻吟，嘆息 pulse /pQls/ n.脈衝stun /stQn/ v.擊昏 註釋：

1. The Shannon Dolphin and Wildlife Foundation (SDWF)：夏農海豚與野生物基金會。

2. the Shannon River：夏農河(位於愛爾蘭共和國的中西部)

3. cow shed:牛棚

4. those指代前半句的' whistles。

5. Ronan Hickey … separated them into six fundamental whistle types and 32 different categories：Ronan Hickey將嘯聲劃分為 6大類 32種。

6. most = most categories

7. both sets of dolphins是指 the Irish dolphins和 the Welsh dolphins。

8. References in local legend：當地傳說中的有關說法

9. they may even have been resident there as far back as the 6th century：海豚可能早在公元 6世紀就在夏農河河口繁衍生息。 resident是形容詞，意思是“居住的”。練習：

1. The difference in eating habits between the bottle-nose dolphins and the sperm whales interested the SDWF scientists. A Right B Wrong C Not mentioned

2. Ronan Hickey analysed almost 2,000 different dialects of the bottle-nose dolphins. A Right B Wrong C Not mentioned

3. Of the 32 categories, eight were produced only by the Irish dolphins. A Right B Wrong C Not mentioned

4. Whistles could also be used to communicate between adult dolphins and baby dolphins. A Right B Wrong C Not mentioned

5. Sperm whales can produce stronger ultrasonic waves to kill their prey than dolphins. A Right B Wrong C Not mentioned

6. As early as the 6th century, Irish fishermen started raising dolphins in the Shannon estuary. A Right B Wrong C Not mentioned