scholarly journals Effects of algal food concentration on the growth and reproduction of Diaphanosoma dubia

2008 ◽  
Vol 20 (3) ◽  
pp. 344-350
Author(s):  
YIN Juan ◽  
◽  
HAN Bo-ping
Keyword(s):  
Food Concentration ◽  
Algal Food ◽  
Growth And Reproduction

Larval settlement behaviour of the barnacle Balanus reticulatus in the laboratory

2002 ◽  
Vol 82 (4) ◽  
pp. 579-582 ◽  
Author(s):  
V. Thiyagarajan ◽  
K.V.K. Nair ◽  
T. Subramoniam ◽  
V.P. Venugopalan
Keyword(s):  
Dominant Species ◽  
Larval Settlement ◽  
Food Concentration ◽  
Test Material ◽  
Organic Polymers ◽  
Algal Food ◽  
Food Quantity ◽  
Glass Surfaces ◽  
Settlement Behaviour

The effect of algal food concentration, substratum, light, salinity, cyprid density and ‘footprints’, cyprid age, films of organic biopolymers, bacteria and diatoms on the settlement of Balanus reticulatus cyprids were studied. The algal food quantity (from 7×104 to 4×105 cells ml−1) fed to nauplii had a significant effect on the settlement. Cyprids failed to settle on glass surfaces but would settle on polystyrene. Light, cyprid ‘footprints’ and age significantly affected the settlement, however, salinity (from 20 to 40 psu) and cyprid density (from 5 to 200 per 5 ml of seawater) had no effect on the settlement. Films of organic polymers, bacteria, and diatoms inhibited the settlement compared to control. It is suggested that cyprids of B. reticulatus can serve as an appropriate test material for antifouling bioassays in those areas where the former forms a dominant species.

scholarly journals Diel horizontal distribution of microcrustaceans and predators throughout a year in a shallow neotropical lake

2013 ◽  
Vol 73 (1) ◽  
pp. 103-114 ◽  
Author(s):  
MS. Arcifa ◽  
TC. Bunioto ◽  
A. Perticarrari ◽  
WJ. Minto
Keyword(s):  
Dissolved Oxygen ◽  
Shallow Lake ◽  
Food Concentration ◽  
Horizontal Distribution ◽  
Water Mites ◽  
Monthly Basis ◽  
Algal Food ◽  
Horizontal Migration ◽  
Adaptive Value ◽  
Invertebrate Predators

The focus of this study is to investigate if microcrustaceans undergo diel horizontal migration (DHM) in a tropical shallow lake on a yearly basis and analyse the adaptive value regarding predation. Abundance of invertebrate predators, chaoborid larvae and water mites, and microcrustaceans (cladocerans and copepods) were evaluated on a monthly basis in three stations located on a transect during the day and at night. Both invertebrate predators were predominantly pelagic. Cladocerans did not undergo significant DHM, distributing indistinctly onshore and offshore or being mostly pelagic. Nauplii, copepodites of two copepod species and adults of Tropocyclops prasinus meridionalis Kiefer were mostly distributed offshore, and did not perform DHM. The limnological features (temperature, dissolved oxygen, pH, and conductivity) were suitable for the organisms in both zones of the lake. Algal food concentration was a little lower in the littoral than in the limnetic zone during the day, but it seems to be suitable for the organisms. However, as the algae quality was not evaluated, it is not possible to be conclusive concerning its influence. The results indicated that DHM was not performed by the microcrustaceans and is not, therefore, a strategy for decreasing predation by both invertebrates, Chaoborus brasiliensis Theobald and Krendowskia sp., on a yearly basis in this shallow lake.

Sign in / Sign up

Export Citation Format

Share Document