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  • tropical zooplankton
  • Springer  (31)
  • Bochum : Inst. für Geologie, Ruhr-Univ. Bochum
  • 1990-1994  (1)
  • 1980-1984  (30)
  • 1990  (1)
  • 1984  (30)
Collection
Keywords
Publisher
  • Springer  (31)
  • Bochum : Inst. für Geologie, Ruhr-Univ. Bochum
Years
  • 1990-1994  (1)
  • 1980-1984  (30)
Year
  • 1990  (1)
  • 1984  (30)
  • 1991  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Some Crustacea Copepoda from Venezuela (1984)
    Springer
    Hydrobiologia 113 (1984), S. 25-67 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; Crustacea ; Copepoda ; Venezuela ; biogeography ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The study of 38 samples of aquatic fauna from Venezuela increased the number of known species here from 28 to 66. Fifteen new species for science are described. A list of Copepoda known from the other regions of South America is presented. From this list, it can be said that only 50% of the inland water Copepoda living actually in Venezuela are known.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026592
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  • 2
    Electronic Resource
    Electronic Resource
    Feeding in adult females of Argyrodiaptomus furcatus (Sars,1901), Copepoda-Calanoida, of Lobo Reservoir (Broa), São Carlos, São Paulo, Brazil (1984)
    Springer
    Hydrobiologia 113 (1984), S. 15-23 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; Copepoda ; feeding ; experiments ; filtration rate ; assimilation rate ; 14C ; algal culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this work was to study the feeding process of Argyrodiaptomus furcatus (Copepoda-Calanoida) in the Lobo Reservoir (São Carlos, SP, Brazil). Non-ovigerous adult females and the 14C technique were used to measure filtration and assimilation rates. The diet contained the following phytoplankton species: Chlamydomonas sp., Ankistrodesmus gracilis, Melosira italica, Scenedesmus quadricauda and Chlorella zoofingensis. The experiments were carried out using unialgal and mixed cultures during 2-, 4- and 6-h periods. The results of the filtration and assimilation rates were compared. The data obtained by statistical tests showed the highest assimilation rate in Argyrodiaptomus furcatus fed Chlamydomonas sp. in both culture types. However, Chlorella zoofingensis and Scenedesmus quadricauda were the most filtered species in unialgal and mixed cultures, respectively. A higher filtration rate was observed for the 2-h period than for the 4- and 6-h periods. Culture agent was also important. Higher assimilation and filtration rates were obtained during the log phase of Chlamydomonas sp. growth than during the stationary phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026591
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  • 3
    Electronic Resource
    Electronic Resource
    The distribution of brackish water Calanoida (Copepoda) along the coasts of Brazil (1984)
    Springer
    Hydrobiologia 113 (1984), S. 147-150 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; estuarine Calanoida ; marine zoogeography ; Brazilian coast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of 18 species of Calanoida Copepoda found in the estuaries of the Brazilian coast is analyzed. A slight tendency of a latitudinal decrease in diversity, from North to South is found. Salinity ranges from the different species are discussed and in some cases interspecific vicariance patterns are found. Two basic types of estuaries of the Brazilian coast are characterized on the basis of environmental parameters and population dynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026601
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  • 4
    Electronic Resource
    Electronic Resource
    An outline of the distribution patterns of the freshwater Copepoda of Israel and surroundings (1984)
    Springer
    Hydrobiologia 113 (1984), S. 151-154 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; freshwater Copepoda ; freshwater zoogeography ; Levantine province ; Israel ; Sinai Peninsula
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of the freshwater Copepoda in the Levantine province is analyzed. The characteristics of the five subprovinces of the freshwater fauna in the area are briefly presented and the representative species of Copepoda, mainly of the Harpacticoida, are mentioned. The presence of a palearctic enclave in the mountains of South Sinai and the presence of Ethiopian species in the Jordan-Dead Sea valley, is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026602
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  • 5
    Electronic Resource
    Electronic Resource
    Zooplankton composition of ten reservoirs in southern Brazil (1984)
    Springer
    Hydrobiologia 113 (1984), S. 137-145 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; reservoirs ; Brazil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The zooplankton of ten reservoirs of Sao Paulo State was analyzed as part of a larger project, ‘Typology of Reservoirs of São Paulo State’. Twenty-four genera of Rotifera, six species of Copepoda and at least nine species of Cladocera were found in samples collected on four occasions in 1979. In general, Rotifera dominated in most reservoirs, although fluctuations occurred during the year. The reservoirs were arranged in four groups, according to zooplankton density, whose range was 10 to 500 i 1−1. The average composition of Crustacea, in number of species at any one time is comparable to those of other water bodies, being a little higher than that of Colorado lakes. The number of species of limnetic Cladocera in Brazil is between those of Holarctic Region and Tropical Asia. Ceriodaphnia cornuta and Bosminopsis deitersi, and a few species of Daphnia are typical of Brazilian zooplankton. Thermocyclops crassus is common in the southern reservoirs but T. minutus seems to be more widely distributed in Brazil. Calanoida occurred in relatively few reservoirs in São Paulo and usually one species at one time. Brachionus and Keratella were more abundant closer to the Equator then to the Tropics, where other genera seem to be more abundant. The range in size of the planktonic Crustacea is relatively small when compared to temperate lakes, being similar to that of other tropical lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026600
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  • 6
    Electronic Resource
    Electronic Resource
    Consumption of zooplanktonic organisms by Astyanax fasciatus Cuvier, 1819 (Osteichthyes, Characidae) in Lobo (Broa) reservoir, São Carlos, SP, Brazil (1984)
    Springer
    Hydrobiologia 113 (1984), S. 171-181 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; predation ; fish ; composition ; preferential ; food
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The consumption of zooplanktonic organisms by young and adult fish of Astyanax fasciatus in Lobo Reservoir was studied from October 1978 to September 1979 by analysing the abundance of zooplankton in the gut of fishes and relating it to the variation of the zooplankton community in the lake. To analyse the diet the following methods were used: numeric frequency of occurrence, and frequency rate. Astyanax fasciatus showed a large spectrum of feeding. The young stage feeds mainly on zooplankton and macroinvertebrates (insect larvae) but the adults also consume algae and detritus. Even in relation to the zooplankton the young stage showed a food preference different from that of the adults, selecting copepods over cladocerans, while the adults consumed more cladocerans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026606
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  • 7
    Electronic Resource
    Electronic Resource
    Physiological responses of the early zoeal stages of Palaemon pandaliformis Stimpson and Palaemon northropi (Rankin) to salinity variation (1984)
    Springer
    Hydrobiologia 113 (1984), S. 165-169 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; crustacean larvae ; Palaemon pandaliformis ; Palaemon northropi ; respiratory metabolism ; palaemonid shrimp ; survival ; salinity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of salinity variation (0, 7, 14, 21, 28 and 35‰S) on survival, moulting and respiratory metabolism of the early zoeal stages of the shrimps Palaemon pandaliformis and P. northropi from the northern coast of the State of São Paulo, Brazil is investigated. Freshly hatched larvae were maintained at 20 °C, in each salinity for a maximum of seven days. Oxygen consumption measurements were made at 20 °C for each salinity using Cartesian diver microrespirometers. In 0‰S, all P. northropi zoeae died after 24 h while 24% of the P. pandaliformis zoeae survived until 4 days. Zoeae of both species survived poorly in 7‰S, the best survival for the two species (90%) being registered in 28%.S. Palaemon northropi zoeae did not survive 35‰S while 45% survival was recorded for P. pandaliformis zoeae in this medium after seven days. Moulting did not occur in zoeae of either species in 0%.S, nor in P. northropi in 7‰S. The metabolism-salinity curve for P. pandaliformis zoea I is very stable over the range 0–21‰S while that for P. northropi exhibits complete salinity independence from 21–35‰ S. Thus, while the early zoeal stages, at least, are conspecific, both developing in the same environment as part of the coastal zooplankton community, they clearly maintain distinct physiological characteristics. The data presented possibly reflect genetic adaptations to the adult biotope already manifested in the first zoeae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026605
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  • 8
    Electronic Resource
    Electronic Resource
    Spatial structure of the zooplankton community in the Cabo Frio region (Brazil) influenced by coastal upwelling (1984)
    Springer
    Hydrobiologia 113 (1984), S. 183-199 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; upwelling ; Brazil ; statistic analysis ; spatial structure ; copepod diversity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cabo Frio area (Central-southern Brazilian littoral) is characterized by a coastal upwelling due to prevailing E-NE winds, mainly during the spring-summer season. The geographic distribution of the zooplankton was described in order to separate ecological areas in terms of specific communities. Cluster analysis by weighted pair-group method (WPGA) and principal component (PC) analysis was performed on the most important hydrological parameters and zooplankton taxa. The first PC, explaining 38% of the total zooplankton variability, represented the influence of the nearshore-offshore gradient. Zooplankton communities and ecological areas were defined as follows: i) nearshore neritic: the richest region with more than 5 000 org. m-3. In this very narrow nearshore region we observed 3 groups of taxa deliminated by upwelling effects and trophic conditions: a) Ctenocalanus vanus, Penilia avirostris, Calanoides carinatus and Copepod larva, all herbivorous species associated with the phytoplankton blooms in the upwelling zone; b) Creseis acicula and Temora stylifera; c) Siphonophora, Chaetognaths and a high diversity of Copepoda dominated by Coryceus amazonicus, C. giesbrechti, Eucalanus pileatus, Clausocalanus acuicornis, all carnivorous or omnivorous feeders representing a high degree of complexity of the ecosystem. ii) offshore neritic: characterized by appendicularians, this region constitutes an intermediate zone between coastal and oceanic waters. iii) oceanic: occupied by the Brazil Current where zooplankton is poor, but diversified, with typical copepods from tropical warm water: Clausocalanus furcatus, Mecynocera clausi, Corycella gracilis, Oithona setigera, Coryceus typicus, Oncea conifera, Undinula vulgaris, Calocalanus pavo, Haloptilus longicornis, Lucicutia flavicornis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026607
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  • 9
    Electronic Resource
    Electronic Resource
    Zooplankton feeding in the fish Trichogaster pectoralis Regan (1984)
    Springer
    Hydrobiologia 113 (1984), S. 217-221 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; Trichogaster ; fish ; fish culturing ; planktivory ; Thailand ; rotifers ; Crustacea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The traditional culture method of Trichogaster pectoralis, using zooplankton produced from fermenting aquatic weeds as a source of food for the fry, leads to productions of ca 1 000 kg ha−1 a−1. If chicken manure is applied at a rate of ca 450 kg ha−1 month−1 instead, much more zooplankton is produced more rapidly, and fish production increases to ca 2 000 kg ha−1 a−1. This results from a higher survival rate of the fry, which feeds on rotifers, ciliates, copepods and cladocera until a size of ca 15.0 mm, when plant material also becomes important in the diet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026609
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  • 10
    Electronic Resource
    Electronic Resource
    Assessment of factors influencing the composition, body size and turnover rate of zooplankton in Parakrama Samudra, an irrigation reservoir in Sri Lanka (1984)
    Springer
    Hydrobiologia 113 (1984), S. 201-215 
    Details
    ISSN: 1573-5117
    Keywords: tropical zooplankton ; flushing ; predation ; food limitation ; metabolism ; rotifers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper considers which of the following factors influenced the taxonomic composition, body size, fecundity and birth rates of the zooplankton inhabiting a tropical irrigation reservoir: (a) wash-out and/or dilution of the population which arose from the water regime to which the reservoir was subjected by management; (b) the size-selective or species-selective predation; (c) the effect of food limitation upon the body size, egg size, post-embryonic duration and fecundities of the planktonic species and (d) the metabolic consequences of high tropical temperatures. Many of these impinge upon the characteristics of tropical zooplankton and it is appropriate that this synthesis of published results on the zooplankton of Parakrama Samudra, Sri Lanka, was prepared for the Symposium on Tropical Zooplankton held at Sao Carlos, Brazil, in December 1982. Daily losses of planktonic rotifers due to wash-out or by dilution were low and not significant compared with their capacity for recruitment but this may be a serious source of loss for the planktonic crustaceans which were virtually absent from this reservoir. Daily death rates (estimated by subtraction) were much higher and were mainly due to predation by a planktonic fish, Ehirava fluviatilis, and by Asplanchnella brightwelli. The main loss occurred during the day and on larger individuals of the brachionid species, Trichocerca spp. and Filinia longiseta, thus resulting in a small-sized rotifer community. This appeared to be due mainly to predation by the fish which was responsible also for the further reduction of rotifer body size in 1980 compared with 1979. Small rotifer body size was not caused by conditions of food deficiency because fecundity and birth rates were relatively high though not optimal. High tropical temperatures aggravate the cost of cumulative respiration resulting from food-limited prolongation of the juvenile phase and will raise the food threshold levels for growth and for reproduction above those adequate for temperate situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026608
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