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  • population dynamics  (6)
  • Background noise (acoustics)
  • Texas Game and Fish Commission Marine Laboratory  (5)
  • Public Library of Science  (2)
Collection
Keywords
Publisher
Years
  • 1
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    Unknown
    Annual Acoustic Presence of Fin Whale (Balaenoptera physalus) Offshore Eastern Sicily, Central Mediterranean Sea (2016)
    Public Library of Science
    Details
    Publication Date: 2017-04-04
    Description: In recent years, an increasing number of surveys have definitively confirmed the seasonal presence of fin whales (Balaenoptera physalus) in highly productive regions of the Mediterranean Sea. Despite this, very little is yet known about the routes that the species seasonally follows within the Mediterranean basin and, particularly, in the Ionian area. The present study assesses for the first time fin whale acoustic presence offshore Eastern Sicily (Ionian Sea), throughout the processing of about 10 months of continuous acoustic monitoring. The recording of fin whale vocalizations was made possible by the cabled deep-sea multidisciplinary observatory, “NEMO-SN1”, deployed 25 km off the Catania harbor at a depth of about 2,100 meters. NEMO-SN1 is an operational node of the European Multidisciplinary Seafloor and water-column Observatory (EMSO) Research Infrastructure. The observatory was equipped with a low-frequency hydrophone (bandwidth: 0.05 Hz–1 kHz, sampling rate: 2 kHz) which continuously acquired data from July 2012 to May 2013. About 7,200 hours of acoustic data were analyzed by means of spectrogram display. Calls with the typical structure and patterns associated to the Mediterranean fin whale population were identified and monitored in the area for the first time. Furthermore, a background noise analysis within the fin whale communication frequency band (17.9–22.5 Hz) was conducted to investigate possible detection-masking effects. The study confirms the hypothesis that fin whales are present in the Ionian Sea throughout all seasons, with peaks in call detection rate during spring and summer months. The analysis also demonstrates that calls were more frequently detected in low background noise conditions. Further analysis will be performed to understand whether observed levels of noise limit the acoustic detection of the fin whales vocalizations, or whether the animals vocalize less in the presence of high background noise.
    Description: Published
    Description: e0141838
    Description: 3A. Ambiente Marino
    Description: JCR Journal
    Description: open
    Keywords: Whales ; Bioacoustics ; Background noise (acoustics) ; Acoustic signals ; Sperm whales ; Vocalization ; Acoustics ; Data acquisition ; 03. Hydrosphere::03.01. General::03.01.08. Instruments and techniques ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring ; 03. Hydrosphere::03.02. Hydrology::03.02.07. Instruments and techniques ; 03. Hydrosphere::03.04. Chemical and biological::03.04.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Computation, Analysis and Preparation of Coastwide Oyster Population Data - Survey of Oyster Population and Associated Organisms (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14201 | 9596 | 2020-08-31 20:32:13 | 14201 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Galveston Bay, Matagorda Bay, San Antonio Bay, Aransas Bay and South Bay areas were sampled at a total of nineteen stations to determine the population characteristics and fluctuations of oysters on the Texas coast. Population samples taken at monthly intervals from these stations showed heavy spat setting occurred in June 1962 and continued in moderation through December 1962. Survival of spat and seed class oysters ranged from moderate in Galveston Bay to excellent in the lower coastal bays. No extensive natural moralities were noted in any of the bay areas and the number of market-sized oysters increased in nearly all the bays. Dermocystidium marinum incidence maintained a high level, but no moralities were associated with the fungus. Oyster populations in Aransas Bay have recovered from the 1959 die-off and are once again approaching an overcrowded conditions for lack of harvesting. Artificial reefs, built in Aransas and Matagorda Bays, have been extremely successful and have attained the characteristics of natural oyster reefs.
    Keywords: Biology ; Fisheries ; oysters ; marine molluscs ; population dynamics ; oyster reefs ; artificial reefs ; growth ; mortality
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 3
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    La Sassa cave: Isotopic evidence for Copper Age and Bronze Age population dynamics in Central Italy (2023)
    Public Library of Science
    Details
    Publication Date: 2023-08-29
    Description: This study focuses on the changes in diet and mobility of people buried in the La Sassa cave (Latium, Central Italy) during the Copper and Bronze Ages to contribute to the understanding of the complex contemporary population dynamics in Central Italy. To that purpose, carbon and nitrogen stable isotope analyses, strontium isotope analyses, and FT-IR evaluations were performed on human and faunal remains from this cave. The stable isotope analyses evidence a slight shift in diet between Copper and Bronze Age individuals, which becomes prominent in an individual, dating from a late phase, when the cave was mainly used as a cultic shelter. This diachronic study documents an increased dietary variability due to the introduction of novel resources in these protohistoric societies, possibly related to the southward spread of northern human groups into Central Italy. This contact between different cultures is also testified by the pottery typology found in the cave. The latter shows an increase in cultural intermingling starting during the beginning of the middle Bronze Age. The local mobility during this phase likely involved multiple communities scattered throughout an area of a few kilometers around the cave, which used the latter as a burial site both in the Copper and Bronze ages.
    Description: Published
    Description: e0288637
    Description: 6A. Geochimica per l'ambiente e geologia medica
    Description: 6SR VULCANI – Servizi e ricerca per la società
    Description: 7SR AMBIENTE – Servizi e ricerca per la società
    Description: JCR Journal
    Keywords: La Sassa cave (Central Italy) ; population dynamics ; nitrogen isotope ; strontium isotope
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Population Studies of the Blue Crabs of the Galveston Bay System - Studies of Blue Crab Populations of the Texas Coast (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14204 | 9596 | 2020-08-31 20:32:49 | 14204 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Trawls, seines, and trammel nets were used to sample the Galveston Bay crab populations. The data collected were used in determining the seasonal abundance of the crabs as compared to previous years' sampling. Blue crab populations in 1962 appeared to be larger than in 1961. The female population lagged behind the male in abundance in all months in 1962 except April, October, and December. The movement of adult crabs appeared to be governed by their search for food, reproductive cycle, and seasonal temperatures. Juveniles remained in the bay all seasons, moving toward the primary bay as they grew. Growth rate of the juvenile crabs was 0.4mm per day.
    Keywords: Fisheries ; Oceanography ; blue crab ; marine crustaceans ; population dynamics ; abundance ; growth ; life history
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 5
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    Population Studies of the Sports and Commercial Fin-fish and Forage Species of the Galveston Bay system (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14199 | 9596 | 2020-08-31 20:31:42 | 14199 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Collections were made at fixed stations with various types of gear to obtain samples of adult game fish, juvenile game fish, and forage species. The stations in West Bay generally produced larger catches of juvenile and adult game fish than did the stations in other bays. The reverse was true of forage collections. Those forage stations in the less saline areas of the bay, for example, the Clear Lake Station, produced larger catches than the lower bay stations. Fish tags, returned during the study, indicated little movement of those fish recaptured. Redfish tag returns were much higher than those from other species.
    Keywords: Ecology ; Fisheries ; marine fish ; population dynamics ; ecological distribution ; tagging
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 16
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  • 6
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    Study of Oyster Growth and Population Structure of the Public Reefs in East Bay, Galveston Bay and Trinity Bay - Survey of Oyster Populations and Associated Organisms (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14202 | 9596 | 2020-08-31 20:32:23 | 14202 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: A moderate set of spat was observed throughout the bay in June and July. A light spat set also occurred in September and October on reefs in the middle and lower bay areas. The fall set was not found in upper Trinity Bay. The majority of the oysters were less than three years of age although remnant population of oysters over five years old were occasionally found. Some oysters reached legal size at two and one-half years of age but most of the market sized oysters were over three years old. The incidence of the fungus organism, Dermocystidium marinum, increased in late summer and early fall. As a result, moralities among the older oysters were expected to increase. However, no unusual moralities were noted by the end of the sample period. The 1961-62 oyster harvest was generally confined to Todd's Dump and Hanna's Reef. Oysters were good in quality but not exceptional. During the 1962-63 season oyster boats spread out and worked several reefs which had been unproductive in past years. Both the quality and quantity of oysters were better than in previous years.
    Keywords: Biology ; Fisheries ; oysters ; marine molluscs ; life history ; growth ; population dynamics ; oyster fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 23
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  • 7
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    Study of the Juvenile Shrimp Populations, Penaeus aztecus and Penaeus setiferus, of Galveston Bay (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14198 | 9596 | 2020-08-31 20:31:32 | 14198 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: One hundred and twenty-three samples were collected producing 3085 white shrimp and 3703 brown shrimp. Juvenile brown shrimp entered the bay in three waves in April, July, and August. Young whites entered in three waves in July, August, and September. The brown shrimp was the more abundant species. Samples produced about one-third as many brown and white shrimp as those of 1961 and about one-tenth as many as those of 1960. Temperatures followed the normal seasonal trend, except for the freeze in January, and a six degree centigrade decline in March. The reduced amount of rainfall and river flow this year resulted in the higher bay salinities than in 1960-61.
    Keywords: Aquaculture ; Fisheries ; penaeid shrimp ; Penaeus aztecus ; Penaeus setiferus ; juveniles ; population dynamics
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 23
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