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1

Digitale Medien

Salinity and temperature tolerance of juvenileMesopodopsis orientalis: laboratory studies (1982)

Bhattacharya, S. S.

Springer

Hydrobiologia 93 (1982), S. 23-30

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; salinity tolerance ; temperature ; Mesopodopsis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Separate and combined effects of changes in salinity and water temperature on the survival of laboratory hatched juvenileMesopodsis orientalis were investifated. Full strength seawater (35‰) was not favorable to juvenile survival. Salinities down to 10% seawater were tolerated when subjected to sudden exposure, but salinity acclimation increased juvenile ability to tolerate even fresh water. Water temperatures tolerated by the animals ranged from 12°C to 33°C. Salinities of 30% to 60% seawater and water temperatures of 22°C to 28°C were most favorable to the juveniles. Experimental results were compared with field observations and a relationship between the salinity and temperature of seawater and abundance of juveniles in May to June, and November to January in Bombay coastal waters (west coast of India) was established. Seawater of reduced salinity was found to be a major factor for occurrence of juvenileM. orientalis in abundance.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008095

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2

Digitale Medien

Size-frequency estimates of secondary production byMysis relicta in Lakes Michigan and Huron (1982)

Sell, Daniel W.

Springer

Hydrobiologia 93 (1982), S. 69-78

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; secondary production ; size-frequency ; biomass ; Great Lakes

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Data from five Great Lakes studies ofMysis relicta populations were reanalyzed to calculate secondary production estimates using the size-frequency method. Production estimates (P) ranged from 0.25 to 3.2 g dry weight m−2 yr−1. Average annual biomass {xxB} and mean annual density (xxD) were 0.11–1.11 g dry weight/ m2 and 25–434 animals/ m2, respectively. P:{xxB} ratios varied only between 2.2 and 3.3. Maximum and minimum biomass values within a study varied by a factor of 519 for one study but by less than 17 for the others. Highest estimates of P, {xxB} and {xxD} were calculated for collections from a 50-m station in Lake Michigan despite the larger populations suspected to be present at greater depths sampled in the other studies. These conservative estimates provide a basis for scaling trophic interactions involvingM. relicta and emphasize findings by previous workers that night-time sampling with vertical net hauls is the best available technique for quantitative studies ofM. relicta populations in the Great Lakes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008100

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3

Digitale Medien

The use of life-tables for evaluating the chronic toxicity of pollutants toMysidopsis bahia (1982)

Gentile, J. H. ; Gentile, S. M. ; Hairston, N. G. ; [weitere]

Springer

Hydrobiologia 93 (1982), S. 179-187

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; life-tables ; populations ; toxicology

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract This study examines the application of population statistics to laboratory-derived toxicological data for the purpose of developing a predictive model that assesses the population consequences of pollutant and environmentally-induced stress. Life tables are used to calculate age-specific survivorship, fecundity, intrinsic rate of population increase (r), and reproductive value (Va), for populations ofMysidopsis bahia chronically exposed, in separate tests, to mercury and nickel. The population statistics, r, and Va, and pollutant dose are defined quantitatively, and the critical value (r = 0) for the intrinsic rate of population increase is compared with traditional toxicological measures of acute and chronic toxicity. The effects of an environmental variable, predation, significantly reduce the critical value (r = 0) for the intrinsic rate of growth and demonstrate the interactions of multiple stressors. The use of the population statistic, r, is recommended for estimating the ecological significance of toxicological data and for facilitating the assessment of interactions between pollutant-stressed populations and dynamic environmental pressures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008111

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4

Digitale Medien

Feeding habits ofMysis relicta — an overview (1982)

Grossnickle, Nevin E.

Springer

Hydrobiologia 93 (1982), S. 101-107

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; Mysis ; feeding ; predation ; herbivory ; omnivory ; stomach contents ; overview

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Mysis relicta has been recognized as an important component of many limnetic food webs. The first approach to studying the feeding habits ofM. relicta was the analysis of stomach contents. Assumptions regarding stomach content analysis have been tested and seasonal feeding estimates ofM. relicta have been reported recently. Laboratory grazing and/or predation experiments have recently been completed usingM. relicta primarily from Lakes Michigan and Tahoe.Mysis relicta is concluded to be opportunistic, capable of utilizing a variety of food resources. It may play an important role in structuring limnetic food webs.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008103

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5

Digitale Medien

Chronic effects of cadmium on two species of mysid shrimp:Mysidopsis bahia andMysidopsis bigelowi (1982)

Gentile, S. M. ; Gentile, J. H. ; Walker, J. ; [weitere]

Springer

Hydrobiologia 93 (1982), S. 195-204

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; cadmium ; toxicology ; opossum shrimp ; Mysidopsis bahia ; Mysidopsis bigelowi

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Two species of mysid shrimp, the sub-tropicalMysidopsis bahia and the northern temperateMysidopsis bigelowi, were exposed simultaneously to cadmium (as CdCl2) in a continuous-flow bioassay system to determine the effect on survival and reproductive success. Temperature and salinity were maintained at 21 ± 1°C and 30‰,respectively. The 96-h LC50 was 110 µg ℓ−1 for both species. The 23-day life cycle LC50 forM. bahia was 19.5 µg ℓ−1 and forM. bigelowi the 27-day LC-50 was 14.8 µg ℓ−1. At 10 µg ℓ−1 a series of morphological aberrations were observed in both species at the onset of sexual maturity. Carapace malformations apparently prevented molting after the release of the initial brood and resulted in death of brooding females. As a result, although the initial reproductive rate at this concentration was successful, successive broods could not be produced. For both species in this study the no observed effect concentration was 5.1 µg ℓ−1; the effect concentration was 10.0 µg ℓ−1. Mechanisms were postulated in this study to explain the effect of cadmium on the molting process and on calcification and enzymatic reactions of osmosis.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008113

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6

Digitale Medien

Key to the shallow water Mysidacea of the Texas coast with notes on their ecology (1982)

Price, W. Wayne

Springer

Hydrobiologia 93 (1982), S. 9-21

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; Texas coast ; key ; biology

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract An illustrated key is presented for the shallow water mysid shrimp of the Texas coast. Six genera and 10 species are included. Information concerning the distribution, ecology, reproductive biology, and morphology of the species in Texas waters is given.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008094

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7

Digitale Medien

Vertical migration ofMysis relicta Lovén (1982)

Beeton, A. M. ; Bowers, J. A.

Springer

Hydrobiologia 93 (1982), S. 53-61

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; migration ; review

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract This review discusses the known features of diurnal vertical migration in the opossum shrimpMysis relicta. Field observations describe a noctural pattern which is correlated to changing patterns of illumination. Hypothesis that offer evolutionary origins of vertical migration are presented which link trophic interactions of the migrator to their predators and prey. These couplings are examined for the case ofMysis relicta. All of the hypotheses are partially supported byMysis behavior.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008098

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8

Digitale Medien

Autecology of the cryptic mysid crustacean,Heteromysis formosa S.I. Smith 1873, in a temperate estuary (1982)

Allen, Dennis M.

Springer

Hydrobiologia 93 (1982), S. 1-7

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; ecology ; estuary

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract The life history pattern, behavior, and distribution of the mysid crustacean,Heteromysis formosa, was studied in a temperate salt marsh. This mysid occurred in epibenthic sled collections every month, but was most abundant from June through November. Marsh creeks with irregular bottoms supported the largest populations, although some individuals occurred in other estuarine habitats and shallow ocean areas.Heteromysis formosa remains hidden on the bottom during the day and swims over open bottom at night. Many young fishes feed onH. formosa, especially at night. Seasonal changes in mysid abundance were related to the life history pattern. Reproduction was continuous from April through October. Overwintering populations of immature mysids were small. FemaleH. formosa were capable of reproducing more than one time. The number of young per brood ranged from 7 to 32 and was related to total adult body length.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008093

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9

Digitale Medien

Size dependent horizontal migration ofMysis relicta (1982)

Morgan, Mark D. ; Threlkeld, Stephen T.

Springer

Hydrobiologia 93 (1982), S. 63-68

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; Mysis relicta ; Lake Tahoe ; horizontal migration ; Donner Lake ; Fallen Leaf Lake

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Quantitative seasonal population estimates ofMysis relicta at shallow and deep stations in Emerald Bay, an isolated (forMysis) embayment of Lake Tahoe, California-Nevada, Donner Lake and Fallen Leaf Lake show thatM. relicta exhibits size dependent horizontal migrations. Adults inhabit deep water where they release young in early spring. The newly released juveniles migrate to shallow water where they remain until late summer when they return to deep water. Adults stay in deep water throughout the year.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008099

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10

Digitale Medien

In situ predatory behavior ofMysis relicta in Lake Michigan (1982)

Bowers, J. A. ; Vanderploeg, H. A.

Springer

Hydrobiologia 93 (1982), S. 121-131

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ISSN: 1573-5117

Schlagwort(e): Mysidacea ; Mysis relicta ; in situ predation ; zooplankton ; Lake Michigan ; opossum shrimp

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Selectivity coefficients (W′) and predation rates on Lake Michigan zooplankton were determined forMysis relicta during spring through fall using anin situ method. W′ values indicated the following ranked order of prey preference: Cladocera 〉 copepod copepodites and copepod nauplii 〉 adult diaptomids and cyclopoids. With few exceptions, W′ values for different prey categories remained fairly constant despite greatly changing relative abundances of prey. Predation rates and prey selectivity were similar in most cases to those determined in laboratory studies. Ingestion rates (percent dry body weight · day−1) were correlated to total prey biomass (r = 0.38) and to effective prey biomass (r = 0.85), where the weighting factors were overall mean selectivity coefficients for the different prey categories. This result suggested that seasonally varying composition of prey caused much of the variation in ingestion rates among experiments. Feeding trials performed at the same depth with daytime and nighttime assemblages of zooplankton indicated that Cladocera may escape heavyMysis predation at night by migrating from the metalimnetic-hypolimnetic interface into the epilimnion.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00008105

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