FROM PAGE 12
The programmes will end on June 7.
The events include arranging discussions, seminars, photo exhibitions, wearing black badges, publishing posters and supplements in newspapers and distributing food and relief materials among the poor.
Zia, who founded Bangladesh Nationalist Party in 1978, was assassinated by a group of disgruntled army officers at the erstwhile Chittagong circuit house on May 30, 1981.
In observance of the day, black flags will be hoisted and BNP flags will be flown at half-mast atop the offices of the party and its associated bodies today.
Besides, BNP senior leaders, led by party Secretary General Mirza Fakhrul Islam Alamgir, will place wreaths at Zia’s grave at the capital’s Sher-e-Bangla Nagar in the morning.
BNP and its associated bodies will arrange discussions on Zia’s activities until June 7 as part of the death anniversary programmes.
The party leaders of Dhaka south and north city units will distribute food and relief materials among the poor in different parts of the city.
All of the party’s district, city and thana units will also observe the day holding various programmes, including discussions, to be participated by senior BNP leaders.
Dolphins
FROM PAGE 12
Gabriella La Manna and her team at the University of Sassari in Italy studied the whistling habits of common bottlenose dolphins (Tursiops truncatus) in six geographically distinct populations in the Mediterranean Sea.
The sites include Port Cros in the French Riviera, Alghero in the Sardinian Sea and Ostia-Fiumicino in the Tyrrhenian Sea – all in the western Mediterranean region.
They also looked at eastern sites of Cres-Losinj in the Adriatic Sea and the Gulf of Corinth in the Ionian Sea, and a southern population in Lampedusa in the Strait of Sicily.
In total, they analysed 188 hours of recorded dolphin chatter, mapping variations in acoustic features such as duration and changes in pitch, and ended up identifying 168 signature whistles.
They concluded that the local ocean environment and population size had the largest effect on the tones.
Signature whistles in areas with sea grass, such as Lampedusa and Port Cros, were higher pitched and shorter in length compared to when the sea bottom was muddy.
Additionally, amongst small populations, like in the Gulf of Corinth, the identifying calls had more changes in pitch than among larger populations.
La Manna’s findings suggest that bottlenose dolphins develops signature whistles that are best suited to their local habitat; the ‘acoustic adaptation hypothesis’.
The study was published in the journal Scientific Reports.