Document Detail


Frequent and prolonged nocturnal occupation of port areas by Yangtze finless porpoises (Neophocaena asiaeorientalis): forced choice for feeding?
MedLine Citation:
PMID:  24920210     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
During the Yangtze Freshwater Dolphin Expedition 2012, Yangtze finless porpoises (Neophocaena asiaeorientalis Pilleri & Gihr, 1972) were acoustically monitored in nine port areas at night. During 6566 minutes of nocturnal monitoring, porpoise sonar was detected for 488 min (7.43% of total time). Of all 81 encounters, the longest echolocation span obtained was 102.9 min, suggesting frequent and prolonged porpoise occupation of the port areas. A combined total of 2091 click trains were recorded, with 129 (6.2%) containing minimum inter-click intervals (ICIs) below 10 ms (termed a buzz). Buzzes with a decrease in ICIs and search and approach phases that resembled feeding echolocation signals accounted for 44.2% (N = 52) of all buzzes. Buzzes with an increase in ICIs, suggesting a mirrored prey capture phase accounted for 20.2% (N = 26) and could reflect attempts to locate escaped prey since they were followed by approach-phase feeding buzzes. Anecdotal evidence of porpoises fleeing the proximity of vessels was observed. The recordings indicating clusters of porpoises feeding near the port areas suggest a forced choice for feeding due to the relatively higher prey availability in the port areas compared to other areas in the Yangtze River that are probably overfished. This article is protected by copyright. All rights reserved.
Authors:
Zhitao Wang; Tomonari Akamatsu; Zhigang Mei; Lijun Dong; Tomohito Imaizumi; Kexiong Wang; Ding Wang
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-6-11
Journal Detail:
Title:  Integrative zoology     Volume:  -     ISSN:  1749-4877     ISO Abbreviation:  Integr Zool     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-6-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101492420     Medline TA:  Integr Zool     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
This article is protected by copyright. All rights reserved.
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