Bacterivory by tropical copepod nauplii: extent and possible significance

Jc, Roff; Turner, JT; Mk, Webber; Hopcroft, RR

doi:10.3354/ame009165

Cited by 125 publications

(65 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nauplii are considered to be an important component of the marine trophic web, because they are the prey of ichthyoplankton and other planktonic consumers (Roff et al, 1995). This result confirms that Oithona osvaldocruzi and E. acutifrons are resident species of the estuary and are present not only because of passive transport in tidal currents but also because of reproduction in the area.…”

Section: Discussionsupporting

confidence: 75%

Zooplankton abundance and biomass in a tropical estuary (Pina estuary-Northeast Brazil).

Sant'Anna¹

2000

TropOcean

View full text Add to dashboard Cite

Abundance and biomass (dry weight) contributions of the holoplankton and meroplankton were determined during diurnal tide cycles (12h) and in different seasonal periods (dry and rainy periods), in the Pina estuary (northeast Brazil). The copepods Oithona oswaldocruzi, O. hebes, Euterpina acutifrons and Parvocalanus crassirostris were the species which dominated by abundance. In the microzooplankton, Favella ehrenbergi and Brachionus plicatilis dominated. Zooplankton biomass was high, (average of 136 mg DW m -3 , with maximum of 717 mg DW m -3 (dry period) and minimum of 4 mg DW m -3 (rainy period). No seasonal variation was observed in biomass although significant alterations related to tides were registered in a short time period, accounting for changes in the zooplankton community. Holoplankton organisms contribuited significantly to the total biomass. Although meroplanktonic organisms occurred in reduced densities, they showed individual high biomass, especially Brachyura zoea (maximum of 52 mg DW m -3 ) and others Decapoda zoea (35 mg DW m -3 ), thus constituting extremely important populations in the energy dynamics of the system.Key Words: estuary, zooplankton, density, biomass, temporal variation, tropical, Brazil. (período seco) e mínimo de 4 mg PS m -3 no período chuvoso). Não foi constatada uma variação sazonal da biomassa, mas foram registradas alterações significativas em curto espaço de tempo, relacionadas com as correntes de marés, evidenciando as mudanças na estrutura da comunidade zooplanctônica. Os organismos holoplanctônicos apresentaram uma contribuição significativa para a biomassa total. Os organismos meroplanctônicos, apesar de ocorrerem em densidades reduzidas, apresentaram biomassa bastante elevada, destacando-se zoea de Brachyura (máximo de 52 mg PS m -3 ) e zoeas de outros Crustacea Decapoda (35 mg PS m -3 ), constituindo-se em populações extremamente importantes na dinâmica energética do sistema. RESUMOPalavras Chave: estuário, zooplâncton, densidade, biomassa, variação temporal, tropical, Brasil. 22

show abstract

Section: Discussionsupporting

confidence: 75%

Zooplankton abundance and biomass in a tropical estuary (Pina estuary-Northeast Brazil).

Sant'Anna¹

2000

TropOcean

View full text Add to dashboard Cite

show abstract

“…Positive correlations were found between bacteria and larvae (nauplii) as well as juvenile (copepodite) stages of Copepoda. Copepod nauplii can ingest pico-and nanophytoplankton (Uye and Kasahara, 1983), and bacterioplankton can also constitute an important food source (Turner and Tester, 1992;Roff et al, 1995). Abundant and 'never-ending' sources of bacteria as food could affect the development of nauplii, of which the highest number endured to copepodite stages.…”

Section: Discussionmentioning

confidence: 99%

Indirect effect of environmental factors on interactions between microbial and classical food webs in freshwater ecosystems

Adamczuk

Mieczan

Nawrot

et al. 2015

Ann. Limnol. - Int. J. Lim.

View full text Add to dashboard Cite

-The role of environmental factors in aquatic ecosystems results from basic lake characteristics, human disturbances ('cultural eutrophication') and climate-related trends in the physical and chemical components of lakes. Although the influence of environmental factors on the abundance of aquatic animals is fairly well documented, less has been done to research their influence on food web interactions. The aim of the study was to evaluate microbial and classical food webs in lakes, with special emphasis placed on the role of environmental factors as influencing strengths. Variation partitioning, based on redundancy analysis, revealed that environmental factors played the most important role in structuring aquatic communities by accounting for 87.5% of their variation. Among all the factors measured, total solids (TS), transparency (Secchi disc) and temperature were most closely related to the variation in trophic communities. The analyses of food web interactions under low and high levels of those factors revealed that they differently influenced strengths among food web components. The strongest relations among distinct trophic levels were found under conditions of low TS, the lowest number of relations was found under conditions of low temperature. Only in low TS did bacteria correlate significantly with biogenes. Under high TS, bacteria positively influenced plenty of higher trophic levels. Top-down control was observed under conditions of high temperature. Conditions of low and high transparency did not diversify food web interactions. The obtained results can broaden our knowledge of the response of food webs to environmental factors in advanced stages of global eutrophication of water bodies and in the early stage of projected trends of global climate change.

show abstract

“…Bacterivory has oeen reported in rotifers (Sacders et al 1989, Ooms-Wilms et al 1995, cladocera (Vaque et al 1992, Burns & Schallenberg 1996, and in copepod nauplii (Roff et al 1995). Some metazoa from Saginaw Bay contained ingested FLB in Expt 4 (Table 3).…”

Section: Direct Effect: Grazing Mortality In Nitrifiersmentioning

confidence: 99%

Cascading trophic effects on aquatic nitrification: experimental evidence and potential implications

Lavrentyev¹,

Gardner²,

Johnson³

1997

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Experiments, using natural plankton collected from a eutrophic site in Saginaw Bay, Lake Huron (USA) and from a hypereutrophic wetland of southern Lake Erie (USA), were conducted to test the hypothesis that bacterivory can control aquatic nitnfication rates. The dynamics of nitrogen and protists in these experiments revealed a consistent pattern: an increase in concentrations of nitrates due to oxidation of NH,' always followed the collapse of bacterivorous nanoplankton populations. This collapse was, in turn, caused by predation pressure of larger ciliates and metazooplankton. Experiments, using enrichment batch cultures maintained at near-ambient concentrations of NH,', indicated that bacterivorous protists can inhibit nitnfication directly by reducing bacterial numbers and indirectly by promoting bacterial aggregation. The latter experiments also suggest that feeding strategies of microbial grazers, e.g. suspension-feeding Spumella sp. versus surface-feeding Bodo saltans, may determine their grazing impacts on nitrifiers. Finally, ingestion rates of fluorescently labeled nitrifying bacteria (FLNB) by the natural planktonic assemblage from Saginaw Bay demonstrated that nanoflagellates were able to efficiently prey on low concentrations of FLNB. Our study suggests that previously neglected trophic factors may be of potential importance for mediating nitrification rates in the pelagic environment.

show abstract

Bacterivory by tropical copepod nauplii: extent and possible significance

Cited by 125 publications

References 22 publications

Zooplankton abundance and biomass in a tropical estuary (Pina estuary-Northeast Brazil).

Zooplankton abundance and biomass in a tropical estuary (Pina estuary-Northeast Brazil).

Indirect effect of environmental factors on interactions between microbial and classical food webs in freshwater ecosystems

Cascading trophic effects on aquatic nitrification: experimental evidence and potential implications

Contact Info

Product

Resources

About