Where do they come from?

Discussion in 'Physiology and Biology' started by DWhatley, Aug 12, 2013.

  1. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    New topic to post links and information on the sources of different ceph species.

    Paralarval octopods of the Florida Current , Journal of Natural History, Clyde F.E. Roper, A. Gutierrez, M. Vecchione 2012

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    [h=2]Abstract[/h]

    Taxonomic and ecological aspects of paralarval octopods from the Florida Current (Gulf Stream) waters off Fort Pierce, Florida are reported. Nine external morphological features were analysed in each specimen, including chromatophore patterns and meristic characters. The relative abundance of each species present in the collections made at standard stations [2–26 nautical miles (nmi) offshore at 2-nmi intervals; 1 nmi = 1.8520 km] was determined in relation to seasonal occurrence, depth of capture, distance offshore and time of day/night. The most common species in the samples was Octopusvulgaris”, followed by Amphioctopus burryi and Macrotritopus defilippi (two morphs). Two forms could not be verified to species, but they most closely resemble Scaeurgus unicurrhus and “Octopusjoubini. The seasonal distribution of the most commonly captured species showed peak relative abundance in the summer months. Paralarval octopods were captured most frequently in the standard stations between 18 and 22 nmi (29.6–40.7 km) offshore in the mid-depth stratum of the water column. Most of the species represented in this study were captured in higher numbers at night than during the day, with the exception of A. burryi.
     
  2. DWhatley

    DWhatley Cthulhu Staff Member Moderator

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    Cephalopods in the potential prey field of sperm whales (Physeter macrocephalus) (Cetacea: Physeteridae) in the northern Gulf of Mexico Heather Judkins, Scarlett Arbuckle, Michael Vecchione, Lance Garrison & Anthony Martinez Nov 2012
    [h=2]Abstract[/h] Cephalopods of the northern Gulf of Mexico are widely distributed and provide an important food source for a variety of marine animals. Sperm whales are year-round residents in the northern Gulf of Mexico. Prey availability has been proposed as an explanation for this non-migratory whale population. To examine this explanation, a short pilot cruise was conducted during the summer of 2009 to test equipment and to obtain preliminary observations. Then the 3-month Sperm Whale Acoustic Prey Study (SWAPS) was conducted during the winter/spring of 2010 to sample the mid-water pelagic community for possible prey of sperm whales. It also compared sperm whale distribution and prey composition across habitats of the northern Gulf of Mexico. This paper focuses on the cephalopod diversity within the mid-water pelagic community and assesses potential prey of the endangered sperm whales.
     

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