Estimating Population Abundance of Atlantic Bottlenose Dolphins (Tursiops truncatus) in the Coastal Waters of Palm Beach County, Southeastern Florida

IF 0.8 4区 生物学 Q4 MARINE & FRESHWATER BIOLOGY
Sahya N. Haria, I. Hardy, Stefan Harzen, Barbara J. Brunnick
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引用次数: 0

Abstract

Atlantic bottlenose dolphins (Tursiops truncatus)are frequently observed in the coastal waters of Palm Beach County, Florida. In this study, mark-recapture surveys using photo-identification techniques were used to estimate population abundance of Atlantic bottlenose dolphins in this area for the first time. Surveys were conducted for 11 years, between 2005 and 2016, during which 384 individuals were identified and catalogued from distinctive nicks and notches on their dorsal fins. Each marked individual was documented an average of 2.4 times (range 1 to 19). Low resighting rates and a constant rate of encounter with previously unmarked individuals suggest that the population is open, comprising both residents and transients. The Jolly-Seber method was used to estimate population abundance. Estimates of abundance varied greatly in time with an overall average of 264 individuals and a 95% confidence interval of 162 to 366 (SE = 51.3), indicating a variable population size. As threats in the region continue to rise, such as overfishing, toxic algae blooms, and environmental pollutants, this understudied population may be vulnerable to decline. A better understanding of the population dynamics could facilitate more effective conservation action.
估计大西洋宽吻海豚(Tursiops truncatus)在佛罗里达州东南部棕榈滩县沿海水域的种群丰度
大西洋宽吻海豚(Tursiops truncatus)在佛罗里达州棕榈滩县的沿海水域经常被观察到。在这项研究中,首次使用照片识别技术进行标记重新捕获调查,以估计该地区大西洋宽吻海豚的种群丰度。从2005年到2016年,调查进行了11年,在此期间,从背鳍上独特的刻痕和缺口中发现了384只个体,并对其进行了分类。每个被标记的个体平均记录2.4次(范围1至19次)。低重定向率和与以前未标记的个体的持续接触率表明,人口是开放的,包括居民和过客。用Jolly-Seber方法估计种群丰度。丰度随时间的变化变化很大,总体平均为264个个体,95%置信区间为162 ~ 366 (SE = 51.3),表明种群规模存在变化。随着该地区的威胁持续增加,如过度捕捞、有毒藻类大量繁殖和环境污染物,这一未得到充分研究的种群可能很容易减少。更好地了解种群动态可以促进更有效的保护行动。
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来源期刊
Aquatic Mammals
Aquatic Mammals MARINE & FRESHWATER BIOLOGY-ZOOLOGY
CiteScore
1.60
自引率
16.70%
发文量
99
审稿时长
>12 weeks
期刊介绍: Aquatic Mammals is a peer-reviewed journal sponsored by the European Association for Aquatic Mammals (EAAM), the Alliance of Marine Mammal Parks and Aquariums (AMMPA), and the International Marine Animal Trainers’ Association (IMATA). Aquatic Mammals publishes articles related to marine mammals (whales, dolphins, seals, fur seals, sea lions, walrus, dugongs, manatees, sea otters, and polar bears). Topics of publication on both captive animals and wild marine mammals include aspects of husbandry; behavior; conservation; veterinary medicine; anatomy; physiology; training; population trends; and the effects of pollution, climate change, and noise.
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