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Mark-recapture abundance estimate of California coastal stock bottlenose dolphins : November 2009 to April 2011
  • Published Date:
    2016
Filetype[PDF - 1.90 MB]


Details:
  • Corporate Authors:
    Southwest Fisheries Science Center (U.S.)
  • Series:
    NOAA technical memorandum NMFS
    NOAA-TM-NMFS-SWFSC ; 563
  • Document Type:
  • Description:
    The occurrence, distribution, group size and abundance of California coastal stock bottlenose dolphins (Tursiops truncatus) were assessed during a boat-based photo-identification study between November 2009 and April 2011 off San Diego, California. A total of 31 photographic surveys were completed and dolphin groups were encountered on 30 (97%) of them. A total of 115 dolphin groups were observed and 346 individuals photographically identified. All groups were sighted within approximately 1-2 km of shore. The mean group size was 8.2 (SE = 0.6) and the average number of dolphins and groups encountered per survey was 31.5 (SE = 4.2) and 3.9 (SE = 0.5), respectively. Low resighting rates (mean = 2.2; SE = 0.8) and an ever-increasing rate of discovery for previously unidentified dolphins were observed. Strikingly, 258 of the 346 identified dolphins during this study were not represented in the prior 1981-2005 photo-identification catalog for San Diego. Dolphins were considered “καοθδγ” ζε ϟϝδυ ϝαγ ϟςμ μο κμοδ γμοπαι εζλ λζϐθπ. Καοθ-οδϐανϟροδ αλαιυπζπ ρπζλϛ ΝΜΝΑΛ απ ςδιι απ ϐιμπδγ κμγδιπ ζλ ΟΚαοθ νομγρϐδγ αβρλγαλϐδ δπϟζκαϟδπ με ͵»͵ καοθδγ γμινϝζλπ (9͵ ̓CΖ = ʹ7«-͵6ʹ, ΠΔ = “ʹ.«) αλγ ʹ͵” καοθδγ γμινϝζλπ (9͵ ̓ CΖ = ʹ»»-͵“ʹ, ΠΔ = “8.»), οδπνδϐϟζσδιυ. Γζεεδοδλϐδπ ζλ δλϐμρλϟδο οαϟδπ, ϛομρν πζφδ αλγ λρκβδο με ϛομρνπ δλϐμρλϟδοδγ νδο προσδυ γροζλϛ ϟϝδ “««9-“«»» πϟργυ ςδοδ ανναοδλϟ ςϝδλ ϐμκναοδγ ϟμ δαοιζδο πϟργζδπ ζλ ϟϝδ πακδ αοδα βδϟςδδλ »98ʹ αλγ “««͵. Χγμζ:»«.7“89/Σ͵/ϞΚ-ΠWΕΠC-͵6”(ϝϟϟν://γτ.γμζ.μοϛ/»«.7“89/Σ͵/ϞΚ-ΠWΕΠC-͵6”)Ω

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