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  • Articles  (9)
  • population dynamics  (8)
  • 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
  • Rockport, TX  (7)
  • Public Library of Science  (2)
  • 1
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    Geosphere-biosphere interacions in bio-activity volcanic lakes: evidences from Hule and Rìo Cuarto (Costa Rica). (2014)
    Public Library of Science
    Details
    Publication Date: 2020-02-24
    Description: Hule and Rı´o Cuarto are maar lakes located 11 and 18 km N of Poa´s volcano along a 27 km long fracture zone, in the Central Volcanic Range of Costa Rica. Both lakes are characterized by a stable thermic and chemical stratification and recently they were affected by fish killing events likely related to the uprising of deep anoxic waters to the surface caused by rollover phenomena. The vertical profiles of temperature, pH, redox potential, chemical and isotopic compositions of water and dissolved gases, as well as prokaryotic diversity estimated by DNA fingerprinting and massive 16S rRNA pyrosequencing along the water column of the two lakes, have highlighted that different bio-geochemical processes occur in these meromictic lakes. Although the two lakes host different bacterial and archaeal phylogenetic groups, water and gas chemistry in both lakes is controlled by the same prokaryotic functions, especially regarding the CO2-CH4 cycle. Addition of hydrothermal CO2 through the bottom of the lakes plays a fundamental priming role in developing a stable water stratification and fuelling anoxic bacterial and archaeal populations. Methanogens and methane oxidizers as well as autotrophic and heterotrophic aerobic bacteria responsible of organic carbon recycling resulted to be stratified with depth and strictly related to the chemical-physical conditions and availability of free oxygen, affecting both the CO2 and CH4 chemical concentrations and their isotopic compositions along the water column. Hule and Rı´o Cuarto lakes were demonstrated to contain a CO2 (CH4, N2)-rich gas reservoir mainly controlled by the interactions occurring between geosphere and biosphere. Thus, we introduced the term of bio-activity volcanic lakes to distinguish these lakes, which have analogues worldwide (e.g. Kivu: D.R.C.-Rwanda; Albano, Monticchio and Averno: Italy; Pavin: France) from volcanic lakes only characterized by geogenic CO2 reservoir such as Nyos and Monoun (Cameroon).
    Description: Published
    Description: e102456
    Description: 4V. Vulcani e ambiente
    Description: JCR Journal
    Description: open
    Keywords: bio activity, volcanic lakes, costa rica ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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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
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    Format: 23
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  • 3
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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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  • 4
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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
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    Format: 10
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  • 5
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    Survey of oyster reef populations (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14217 | 9596 | 2020-08-23 22:26:58 | 14217 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: A study was conducted to determine the changes in the oyster populations on major reefs in Galveston Bay. The associated reef organisms with special emphasis on pests and predators were studied by way of collecting samples at a number of field stations.
    Keywords: Ecology ; oysters ; oyster reefs ; population dynamics ; biological sampling ; population characteristics ; GBIC
    Repository Name: AquaDocs
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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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    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
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    Format: 11
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  • 8
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    Study of the Bay and Gulf Populations of Shrimp: Penaeus aztecus, Penaeus setiferus, and Penaeus duorarum (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14197 | 9596 | 2020-08-31 20:31:04 | 14197 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: During the 1962 study 894 shrimp samples were collected on the Texas coast from Galveston to the Lower Laguna Madre. These samples produced 42,745 brown shrimp and 18,072 white shrimp. Postlarval samples, collected with a plankton net, a pull seine, and a beam trawl at Aransas Pass, indicated two major groups of small shrimp entered Aransas and Corpus Christi Bays. The first wave entered the bays in February and March, and the second wave entered in October and November. Bay samples, collected with the standard trawls and seines, indicated at least three major waves each of brown and white entered most bays this year. Brown shrimp were found to grow at the rate of 0.8 millimeters per day leaving the bays at 80 millimeters mean size. White shrimp grew 1.1 millimeters per day moving Gulfward at 110 millimeters. Brown and white shrimp left the lower Laguna Madre at a smaller size than in other bays. Pink shrimp were stragglers in the more southerly bays, San Antonio Bay to the Lower Laguna Madre. They grew at the rate of 0.7 millimeters per day in the Lower Laguna moving Gulf ward at 50 millimeters mean size. Gulf samples were collected in the Port Aransas Area at depths of 15 fathoms showed the brown shrimp to be present from March to November but were more abundant from July to September. The majority of the brown shrimp caught in the inshore Gulf were under legal count size about 118 mm. White shrimp were found year round in the collections but were more abundant during the winter and spring. White shrimp taken in the collections were legal count size all year except in February. Salinities were higher this year than in 1961. Temperatures followed the normal seasonal trend except for the freeze in January and a slight temperature drop in March. Commercial shrimp landings shows the total shrimp production increased one per cent from 1961 and decreased 28 per cent from the 1960 commercial production. Data collected this year further substantiates the need for closing certain shallow nursery areas to shrimping. There also appears to be a need for additional regulations of the inshore Gulf to protect the transit, under count brown shrimp during the summer and fall.
    Keywords: Conservation ; Fisheries ; Management ; population dynamics ; penaeid shrimp ; pink shrimp ; white shrimp ; brown shrimp ; Penaeus aztecus ; Penaeus setiferus ; Penaeus duorarum ; brown shrimp ; ecological distribution ; juveniles ; trawl nets ; seine nets ; life history ; shrimp fisheries
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 53
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  • 9
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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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