DIVING BEHAVIOR OF PORPOISES USING MICRO DATA LOGGER

为了监测自由潜水江豚的潜水行为，1993-1997年，在北开岛丰卡湾的港豚Phocoena Phocoena的DOR-Sal鳍上安装了带有释放机制的MICRO数据记录仪。用微型数据记录仪记录了11只江豚的时间深度信息，但后来又增加了游泳王速度。1994年成功地恢复了对数。揭示了4871个潜水深度和水温的141小时潜水数据。江豚几乎连续潜水，在浅水区长期休息。最大潜深98.6米，在20米或20米处潜水时间占70%以上。大多数浅潜水是V形的，没有底时间。分析表明，江豚在开始潜水前已经预料到它们将潜水的深度。氧气供应使江豚通常在有氧潜水极限下潜水。

IN ORDER TO MONITOR THE DIVING BEHAVIOR OF FREE-RANGING CETACEANS.MICRO DATA LOGGERS, WITH RELEASE MECHANISMS, WERE ATTACHED TO THE DOR-SAL FINS OF HARBOR PORPOISES, PHOCOENA PHOCOENA, IN FUNKA BAY, HOKKAI-DO DURING 1993-1997. A TOTAL OF ELEVEN HARBOR PORPOISES WERE TAGGEDWITH MICRO DATA LOGGER WHICH RECORDS TIME-DEPTH INFORMATION, BUT SWIM-KING SPEED WAS ADDED IN LATER YEARS.TWO SUCCESSFULLY RECOVERED LOG-GERS IN 1994, REVEALED 141 HOURS DIVE DATA WHICH INCLUDE DEPTH ANDWATER TEMPERATURE IN 4,871 DIVES.PORPOISES DIVED ALMOST CONTIONUOUSLYRARELY EXHIBITING LONG-TERM REST AT THE SURFACE.MAXIMUM DIVE DEPTHSWERE 98.6 METERS WITH MORE THAN 70% OF DIVING TIME AT 20 METERS ORLESS.MOST SHALLOW DIVES WERE V-SHAPED WITH NO BOTTOM TIME.THE DESCE-NT RATE WAS NOT CONSTANT RELATED TO A FINAL DIVE DEPTHRANGE.ANALYSISSUGGESTED THAT THE PORPOISES HAVE ANTICIPATED THE DEPTH TO WHICH THEYWILL DIVE BEFORE INITIATING THE DIVE ITSELF.MATABOLISM OF OXYGEN SUG-GESTED THE PORPOISES USUALLY DIVE UNDER THE AEROBIC DIVE LIMITS.