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  • 1
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    Growth rate of Eurytemora affinis determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; Chesapeake Bay; E_affinis_GROWTHEXP; Growth rate as carbon per carbon biomass; Growth rate as carbon per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Population dynamics of exploited cultures of calanoid copepods (1970)
    Springer
    Helgoland marine research 20 (1970), S. 360-372 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary 1. Population densities of calanoid copepods fluctuated in cultures subjected to exploitation rates of from 10 to 24% of the populations per day. The fluctuations were probably caused by the discontinuous events (feeding and harvesting) that were inherent in the laboratory procedure. 2. Birth rates in the cultures were much higher than were necessary to replace the individuals removed by predation except at rates of exploitation that depleted the populations. 3. Cannibalism probably occurred in the cultures ofAcartia tonsa. 4. Population density decreased with increasing rates of predation in cultures ofArcatia tonsa. The same statistic decreased only with excessive predation in cultures ofEurytemora affinis. 5. Sex ratios changed with increasing predation. The proportion of adultArcatia tonsa that were females increased at the highest rates of exploitation. The proportion of female adults in a wild population was inversely proportional to the logarithm of population density. The genetic sex ratio in the same population was unity. There was no indication of early death of males. It thus appeared that genotypic males became phenotypic females during the course of their growth. Males predominated in both wild and laboratory populations ofEurytemora affinis. 6. Changes in sex ratio of the two species appear to be homeostatic mechanisms. Reproductive rates ofArcatia tonsa were increased at low population densities by the higher proportion of females. The increased proportion of males in populations ofEurytemora affinis may be a means for assuring copulation at low population densities.
    Notes: Abstract En laboratoire, cultures des copépodes calanoides,Acartia tonsa (Dana) etEurytemora affinis (Poppe) étaient exposées à différents taux de déprédation, allant de 10 à 24% des populations par jour, suivant les espèces et les températures. Les densités des populations variaient considérablement, ce qui provenait probablement des évènements intermittents (la nourriture et les récoltes) habituelles de la procédure en laboratoire. La bibliographie, ainsi que mes propres observations avancent deux mécanismes homéostatiques. Le cannibalisme aide à régulariser la population d'A. tonsa quand la nourriture devient rare par suite de la haute densité des populations. La proportion des femelles adultes augmente durant les densités basses des populations d'A. tonsa. La proportion sexuelle génésique de ces populations était de 1:1. L'augmentation proportionnelle des femelles paraisse provenir de mâles génotypiques changeant en femelles phénotypiques au cours de leur croissance. Cette proportion plus élevée des femelles augmente le taux de la reproduction quand les populations étaient peu denses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01609913
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Detritus as food for estuarine copepods (1977)
    Springer
    Marine biology 40 (1977), S. 341-353 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A variety of detrital foods derived from marsh plants were fed to the copepods Eurycemora affinis and Scottolana canadensis. The copepods did not survive well or produce eggs when feeding on detritus with smaller amounts of microbiota, but did well when a rich and abundant microbiota was present. Ciliated protozoans appear to be particularly important in the transfer of detrital energy to copepods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395727
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Flows of materials between poorly flooded tidal marshes and an estuary (1976)
    Springer
    Marine biology 35 (1976), S. 359-373 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flows of particulate carbon, nitrogen, phosphorus, chlorophyll a, crude fiber, carbohydrate, and adenosine tri-phosphate; and of dissolved nitrogen and phosphorus between a marsh and the Patuxent estuary, Maryland, USA, were measured over a 2-year period. Virtually no carbon was exchanged, while net flows of nitrogen and phosphorus were from the marsh to the estuary, principally in dissolved forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386646
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ciliates as a food source for marine planktonic copepods (1977)
    Springer
    Microbial ecology 4 (1977), S. 27-40 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Copepods of the genusEurytemora, isolated from the Patuxent River, a tributary of Chesapeake Bay, were fed suspensions of the ciliateUronema isolated from the Rhode River, a subestuary of Chesapeake Bay. Grazing by copepods was determined by the decrease in numbers of ciliates, which were monitored by both direct counting and particle size analysis. Results from both methods of analysis showed significant reduction in the numbers ofUronema in the suspension whenEurytemora was present. Survival of copepods with ciliates added as food source was significantly longer than without ciliates. Analysis of field samples collected in the fall showed that ciliates comprised approximately 20% of the total plankton biomass at selected sampling sites. The results of the laboratory and field studies indicate that copepods can feed on ciliates and suggest that, in nature, ciliates may comprise an important source of food for copepods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010427
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon requirements of a population of the estuarine copepod Eurytemora affinis (1975)
    Springer
    Marine biology 31 (1975), S. 235-247 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The production of algae in the Patuxent River estuary (Maryland, USA) was much less than the carbon requirements of a population of the calanoid copepod Eurytemora affinis. Detrital carbon was present in quantities that suggest turnover times of 8 to 83 days for this pool, assuming that all algal production was consumed by E. affinis. We hypothesize that E. affinis must consume detritus to meet a part of its requirements for energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387152
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Modification of the feeding behavior of marine copepods by sub-lethal concentrations of water-accommodated fuel oil (1980)
    Springer
    Marine biology 56 (1980), S. 59-64 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The feeding behaviors of Acartia clausi and A. tonsa were measured in samples of water containing low levels of a water-accommodated fraction of No. 2 fuel oil. The copepods fed normally at a hydrocarbon concentration of 70 μg l-1, but their feeding behavior was altered both quantitatively and qualitatively at a concentration of 250 μg l-1. Three types of response to the higher oil level were found. The first was total suppression of feeding. Both other types involved suppression of feeding on particles between 7 and 15 μm diameter, but one showed no change in the ingestion of larger particles, whereas the other displayed increased feeding on particles larger than 15 μm diameter. These results suggest that the species of Acartia studied use three different modes of feeding, each on a different size range of particulate material. Low-level hydrocarbon pollution affects each feeding mode differently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390594
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  • 8
    Electronic Resource
    Electronic Resource
    Grazing by adult estuarine calanoid copepods of the Chesapeake Bay (1977)
    Springer
    Marine biology 42 (1977), S. 69-84 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Grazing by adult female Eurytemora affinis, Acartia tonsa and A. clausi on natural distributions of particles from the Chesapeake Bay has been investigated. During the course of a year's sampling, a wide variety of particle size-biomass distributions were observed as seasonal shifts in detritus, and over 150 algal species occurred. These distributions were grouped into 5 basic types in the analyses of feeding. All three species demonstrated similar capabilities for feeding over a broad range of particle size with selection (higher filtering rates) on larger particles and on biomass peaks. Feeding on multiple-peak distributions resulted in strong selection or “tracking” of each biomass peak with reduced filtering rates between peaks. Evidence is presented which suggests that the copepods first feed on large particles and then successively switch to biomass peaks of the smaller size categories. Comparisons of the feeding behavior of Eurytemora affinis and the Acartia species showing that the Acartia species have greater capabilities for taking large particles may be associated with modifications of their mouth parts for raptorial feeding. The results suggest considerable flexibility in copepod feeding behavior which cannot be explained solely by the mechanism of a fixed sieve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392015
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  • 9
    Electronic Resource
    Electronic Resource
    Grazing in juvenile stages of some estuarine calanoid copepods (1977)
    Springer
    Marine biology 43 (1977), S. 317-331 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The grazing of juvenile Eurytemora affinis, Acartia tonsa and A. clausi from the Chesapeake Bay (USA) was investigated using natural particle distributions and freshly caught copepods, live-sorted into stages. Data were analyzed in ≥110 size channels using an electronic particle counter, and filtering rates (FR) were estimated based on total particle removal (mean FR), and that for each size channel (giving maximum FR). Mean and maximum filtering rates increased from NVI (Nauplius Stage VI) through CVI (Copepodid Stage VI). Both rates plotted against weight satisfied a log fit best for A. tonsa, and a linear fit best for E. affinis. Results for A. tonsa were quite variable, apparently due to differences in temperature between experiments. Particle selection was investigated from the shape of the filtering rate curve over particle size. We define selective feeding by a FR curve which is higher in some size categories, and non-selective feeding by a flat FR curve. The general pattern was one of selective feeding in all copepodid stages of the three calanoid copepods investigated. E. affinis tended to “track” biomass peaks while Acartia spp.'s feeding was more variable, including feeding in size ranges of greatest particle concentration, on larger particles, and in other size categories as well. Experiments with nauplii tended to yield flat FR curves, and it may be that selective grazing appears with, or is greatly accentuated by, metamorphosis from NVI to CI (Copepodid Stage I).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396926
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  • 10
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    Unknown
    Ciliates as a food source for marine planktonic copepods (1977)
    Springer
    Details
    Publication Date: 1977-03-01
    Print ISSN: 0095-3628
    Electronic ISSN: 1432-184X
    Topics: Biology
    Published by Springer
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