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  • 1
    Publication Date: 2021-08-26
    Description: Juvenile and adult Loligo opalescens Berry were video taped in Monterey Bay with the remotely operated vehicle (ROV) Ventana,captured with an otter trawl in Santa Monica Bay, California, and adults were taken from the Monterey Bay fishery. Behavioral observations were made over a 13 h period of video sequences. Allometry measurements were made on 157 squids ranging in size from 12 to 151 mm mantle length (ML). In addition to ML we measured the morphometric characters of fin length(FL), fin width (FW), mantle width (MW), eye diameter (ED), head width (HW), funnel aperture diameter(FA), fourth arm length (AL) and tentacle length(TL). Loligo opalescens changes shape with ontogeny due to negative allometric growth of ED, HW, TL, MW, FA and positive allometric growth of AL, FL and fin area. The allometry measurements were used to determine the size of juvenile squids video-taped in open water. A linear regression can predict dorsal ML in mm from a dimensionless ratio of ML upon ED (r2=0.857, P〈0.001). Sizes and velocities of video-taped animals were estimated from 26 video sequences ranging from 〈1.0 to 8 s. The average velocity for squids ranging from 12–116 mm ML was 0.21 m s–1 and the maximum velocity was 1.60 m s–1(116 mm ML). Allometric measurements can provide scale for 2-dimensional images in order to estimate size, velocity and age of animals.
    Type: Article , PeerReviewed
    Format: text
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  • 2
    Publication Date: 2024-01-12
    Description: The coastal waters of East Kalimantan are part of the western boundary of the Indo-West Pacific centre of maximum marine biodiversity. During the pilot phase of the East Kalimantan Program (EKP) this has been tested by various specialists who used model taxa to test this hypothesis. Emphasis has been put on the species-rich coral reefs and islands that show reef communities in association with mangroves, seagrass, and algae. A range of habitats has been surveyed, varying in distance offshore (with decreasing salinity, turbidity, sedimentation and nutrient load): fringing reefs along the mainland shore, offshore patch reefs, delta-front barrier reefs, and uplifted atolls. The atolls consist of limestone rock and contain shallow enclosed marine lakes with a unique marine biota. The various marine environments at NE Kalimantan have enabled the selection of taxa and sites that can be used for future research on climate change records (e.g. corals, sponges and molluscs), molecular (genetic) divergence within species between separated populations, and environmental effects on species diversity. The biodiversity data will be important for the design of Marine Protected Areas (MPAs) and as an instrument in raising public awareness regarding the sustainable use of the natural resources, such as through fisheries and diving tourism.
    Keywords: Marine biodiversity ; Berau region ; Kalimantan ; Indonesia
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/other
    Format: application/pdf
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  • 3
    Publication Date: 2015-03-10
    Type: Proceedings , PeerReviewed
    Format: text
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