| Visual and acoustic survey of humpback whales (Megaptera novaeangliae) in the eastern and southern Caribbean Sea, preliminary findings - :8523 | National Marine Fisheries Service (NMFS)
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Visual and acoustic survey of humpback whales (Megaptera novaeangliae) in the eastern and southern Caribbean Sea, preliminary findings
  • Published Date:
    2001
Filetype[PDF - 1.85 MB]


Details:
  • Corporate Authors:
    Southeast Fisheries Science Center (U.S.)
  • Description:
    Knowledge of the abundance and distribution of humpback whales (Megaptera novaeangliae) in the eastern and southern Caribbean Sea is scarce compared to that documented in recent times for the principal breeding, areas in the northeastern West Indies. A dual-mode survey for humpback whales was conducted in the eastern and southern Caribbean Sea to (1) assess the current distribution and status of this species in areas where it was previously exploited to economic depletion; and (2) to evaluate the effectiveness of using both visual and passive acoustic survey methods to detect humpback whales in this region. The survey was conducted from the 75 m NOAA RV Gordon Gunter, and included most of the islands in the Lesser Antilles, Trinidad, Tobago, Barbados, and the north coast of Venezuela. The multi-national research team included scientists from Caribbean nations, Brazil, and the United States. Approximately 10,900 km of trackline was surveyed between 16 February and 29 March 2000 to correspond with the peak-breeding season of humpback whales in the West Indies. This included 4,331 km of “μλ-δεεμοϟ ́σζπραι προσδυ ϐμλγρϐϟδγ γροζλϛ Βδαρεμοϟ πδα πϟαϟδ < ͵ βυ ϟδακπ με ϟϝοδδ μβπδοσδοπ ρπζλϛ “͵τ “βζϛ-δυδ ́βζλμϐριαοπ αλγ 7τ ϝαλγϝδιγ βζλμϐριαοπ. Ϟϝδ προσδυ κδϟϝμγμιμϛυ εμιιμςδγ πϟαλγαογ ΛΜΑΑ/ΛΚΕΠ νομϟμϐμιπ εμο ϐδϟαϐδαλ πζϛϝϟζλϛ προσδυπ. Α ϟμϟαι με ”” σζπραι πζϛϝϟζλϛπ με ϝρκνβαϐθπ (λ = ʹ6, ζλϐιργζλϛ ϟϝοδδ ϐαισδπ) ςαπ καγδ γροζλϛ βμϟϝ ϟϝδ “μλ-δεεμοϟ ́αλγ “μεε-δεεμοϟ” σζπραι προσδυ κμγδπ ϐμκβζλδγ. Ϝμςδσδο, μ́λ-δεεμοϟ ́πζϛϝϟζλϛπ ςζϟϝμρϟ αϐμρπϟζϐ αππζπϟαλϐδ ςδοδ εδς (λ = 9). Γζοδϐϟζμλαι (ΓΖΕΑΟ) πμλμβρμυπ, γζϛζϟαι (ΓΑϞ) ϟανδ οδϐμογδοπ, αλγ ϐρπϟμκ πμεϟςαοδ ςδοδ ρπδγ ϟμ γδϟδϐϟ αλγ οδϐμογ ϐαιιζλϛ ϝρκνβαϐθ ςϝαιδπ ζλ ϟϝδ προσδυ αοδα, ϟμ ϐμιιδϐϟ αλγ αοϐϝζσδ πακνιδπ με ϝρκνβαϐθ πμλϛ εμο αλαιυπζπ, αλγ ϟμ γζοδϐϟ ϟϝδ σδππδι ϟμ ιμϐαϟζμλπ με ϝρκνβαϐθ ςϝαιδπ εμο βζμνπυ αλγ νϝμϟμϛοανϝζϐ ζγδλϟζεζϐαϟζμλ πακνιζλϛ. Βδαοζλϛ αλϛιδπ εομκ ϟϝδ πμλμβρμυπ ϟμ πζλϛζλϛ ςϝαιδπ ςδοδ ϐαιϐριαϟδγ αϟ πδα ϟμ γδϟδϐϟ ζλγζσζγραι αλζκαιπ, αλγ ϐομππ-βδαοζλϛπ εομκ κμοδ ϟϝαλ μλδ πμλμβρμυ ςδοδ ρπδγ ϟμ γδϟδοκζλδ ϟϝδζο αννομτζκαϟδ ιμϐαϟζμλπ. Ϝρκνβαϐθ ςϝαιδ πμλϛ ςαπ γδϟδϐϟδγ ϟϝομρϛϝμρϟ ϟϝδ δλϟζοδ προσδυ αοδα, ζλγζϐαϟζλϛ ϟϝαϟ πμκδ ϝρκνβαϐθ ςϝαιδπ ϐροοδλϟιυ μϐϐρνυ αοδαπ ςϝδοδ ϐμκκδοϐζαι ςϝαιδοπ ϝζπϟμοζϐαιιυ ϝρλϟδγ ϟϝδκ ϟμ γδνιδϟζμλ. Α ϟμϟαι με 7ʹ αϐμρπϟζϐ γδϟδϐϟζμλπ με πζλϛζλϛ ϝρκνβαϐθ ςϝαιδπ ςδοδ μβϟαζλδγ εομκ αννομτζκαϟδιυ ”͵« ϝο με κμλζϟμοζλϛ με »76 πμλμβρμυπ γδνιμυδγ ϟϝομρϛϝμρϟ ϟϝδ πϟργυ αοδα. Ϟϝδπδ γδϟδϐϟζμλπ εμοκδγ ϟϝδ βαπζπ με α νοδιζκζλαου δπϟζκαϟδ με ϟϝδ οδιαϟζσδ αβρλγαλϐδ με ςϝαιδπ (λμϟ ζλϐιργζλϛ ϐαισδπ) ζλ ϟϝδ ζπιαλγπ αλγ ϐμαπϟαι αοδαπ προσδυδγ με »»6 (9͵ ̓CΖ: 7“-“9”) ςϝαιδπ ζλ Εδβοραου, αλγ »“” (9͵ ̓CΖ: 77-”»”) ζλ Καοϐϝ. Βζμνπυ πακνιδπ αλγ νϝμϟμϛοανϝπ ςδοδ μβϟαζλδγ εομκ ϟϝδ πϝζν αλγ εομκ ϟςμ οζϛζγ-ϝριιδγ ζλειαϟαβιδ βμαϟπ. Πζϛϝϟζλϛπ με μϟϝδο ϐδϟαϐδαλ πνδϐζδπ αοδ πρκκαοζφδγ. Μλϛμζλϛ νμπϟ-προσδυ αλαιυπδπ λμϟ οδνμοϟδγ ϝδοδ ζλϐιργδ: εροϟϝδο γδσδιμνκδλϟ με αϐμρπϟζϐ βαπδγ αβρλγαλϐδ δπϟζκαϟζμλ κδϟϝμγπ εμο ϝρκνβαϐθ ςϝαιδπ, ϛδμϛοανϝζϐαι γζπϟοζβρϟζμλ με ϝρκνβαϐθ ςϝαιδπ γδϟδϐϟδγ αϐμρπϟζϐαιιυ, αλαιυπζπ με ϝρκνβαϐθ ςϝαιδ πμλϛ ϐϝαοαϐϟδοζπϟζϐπ αλγ πϟορϐϟροδ ϟϝομρϛϝμρϟ ϟϝδ Wδπϟ Ζλγζδπ, ϛδλδϟζϐ οδιαϟζμλπϝζν με ϝρκνβαϐθπ ζλ ϟϝδ δαπϟδολ αλγ πμρϟϝδολ Cαοζββδαλ Πδα ϟμ μϟϝδο νμνριαϟζμλπ, αλγ ϐμκναοζπμλ με νϝμϟμϛοανϝπ ςζϟϝ ϟϝδ Λμοϟϝ Αϟιαλϟζϐ ϝρκνβαϐθ ςϝαιδ νϝμϟμϛοανϝζϐ ζγδλϟζεζϐαϟζμλ ϐαϟαιμϛρδ. Αιϟϝμρϛϝ ϟϝδ μβπδοσδγ ιμς γδλπζϟυ με ςϝαιδπ ςαπ ναοϟιυ αϟϟοζβρϟαβιδ ϟμ ϟϝδ δεεδϐϟ με πϟομλϛ ϟοαγδ ςζλγπ αλγ ϝζϛϝ πδα πϟαϟδπ μλ σζπραι προσδυ ϐμλγζϟζμλπ, ϟϝδ οδπριϟπ με ϟϝζπ προσδυ πρϛϛδπϟ ϟϝαϟ ϟϝδ αβρλγαλϐδ με ϝρκνβαϐθπ ζλ ϟϝδ δαπϟδολ αλγ πμρϟϝδολ Cαοζββδαλ Πδα ζπ ιμςδο ϟϝαλ ζϟ ςαπ γροζλϛ ϟϝδ »9ϟϝ ϐδλϟρου. Εροϟϝδοκμοδ, μβπδοσδγ γδλπζϟζδπ αοδ μλδ μο ϟςμ μογδοπ με καϛλζϟργδ ιμςδο ϟϝαλ ϟϝμπδ οδϐμογδγ εομκ ϟϝδ νοζκαου ςζλϟδοζλϛ αοδαπ ζλ ϟϝδ λμοϟϝδαπϟδολ Ϛοδαϟδο Αλϟζιιδπ.

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