Grazing of two common appendicularians on the natural prey assemblage of a tropical coastal ecosystem

Scheinberg, Rebecca D.; Landry, Michael R.; Calbet, Albert

doi:10.3354/meps294201

Cited by 60 publications

(41 citation statements)

References 39 publications

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“…Their contribution was by far lower in Mersin Bay and coastal Egyptian waters during the relevant seasons or months (Zakaria, 2006;Yilmaz & Besiktepe, 2010), whereas in Iskenderun Bay they represented almost 19% of total abundances in summer (Terbiyik Kurt & Polat, 2013). Appendicularians are able to feed on submicron particles (Scheinberg et al, 2005), and their populations in the Mediterranean have been linked to those of autotrophic picoplankton (Calbet et al, 2001;Yilmaz & Besiktepe, 2010) and water rich in dissolved organic carbon (and therefore microbial populations; Isari et al, 2007). Thus it is possible that the relatively large proportion of appendicularians around Cyprus is related to the dynamics of the microbial loop in these waters.…”

Section: Mesozooplankton Communities Around Cyprus and In The Surrounmentioning

confidence: 99%

Mesozooplankton biomass and abundance in Cyprus coastal waters and comparison with the Aegean Sea (eastern Mediterranean)

Hannides¹,

Siokou²,

Zervoudaki³

et al. 2015

Medit. Mar. Sci.

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Here we conduct the first comprehensive assessment of mesozooplankton abundance, biomass, and taxa composition in Cyprus coastal waters (Levantine Sea). Mesozooplankton abundance and biomass sampled at several locations around the island ranged from 153 -498 individuals m -3 and 0.7 -5.2 mg dry weight m -3 , respectively, with significantly larger biomass observed in winter-early spring (March) than in summer (September). The community was dominated by calanoid and cyclopoid copepods throughout the year (80% of total numbers), with higher abundances of predatory taxa (chaetognaths and medusae) in winter and cladocerans in summer. Overall, we find that coastal mesozooplankton communities around Cyprus appear to be more similar to communities in offshore waters or those around the island of Rhodes than to communities along the mainland Levantine coast. We further highlight regional differences in the Eastern Mediterranean by comparing our data with mesozooplankton in the Western Aegean (Saronikos Gulf) and Northeastern Aegean Sea (NEA). Distinct spatial differences were observed, for example anthropogenic influences in the Saronikos Gulf and the outflow of Modified Black Sea Water in the NEA drove generally greater biomass and abundance in these regions. Overall, our comparison supports the concept of a latitudinal gradient in oligotrophy in the Eastern Mediterranean, with ultra-oligotrophic conditions found in the Levantine Sea.

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Section: Mesozooplankton Communities Around Cyprus and In The Surrounmentioning

confidence: 99%

Mesozooplankton biomass and abundance in Cyprus coastal waters and comparison with the Aegean Sea (eastern Mediterranean)

Hannides¹,

Siokou²,

Zervoudaki³

et al. 2015

Medit. Mar. Sci.

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“…Some copepod species are able to prey on algal cells attached to detritus or attack fecal pellets (Turner, 2004). Finefiltering feeders such as larvaceans and barnacle larvae might be able to capture pico-sized particles (Scheinberg et al, 2005;Vargas et al, 2006), while marine cladocerans and veliger larvae are able to capture the smallest nanoflagellates (Katechakis and Stibor, 2004;Vargas et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variability of Mesozooplankton Feeding Rates on Phytoplankton in Subtropical Coastal and Estuarine Waters

2017

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In order to understand how mesozooplankton assemblages influenced phytoplankton in coastal and estuarine waters, we carried out a monthly investigation on mesozooplankton composition at two contrasting stations of Hong Kong coastal and estuarine waters and simultaneously conducted bottle incubation feeding experiments. The assemblage of mesozooplankton was omnivorous at both stations with varying carnivory degree (the degree of feeding preference of protozoa and animal food to phytoplankton) and the variations of carnivory degree were significantly associated with microzooplankton biomass (ciliates for the coastal station, both ciliates and dinoflagellates for the estuarine stations) and physical environmental parameters (primarily salinity). High carnivory was primarily due to high composition of noctilucales, Corycaeus spp., Oithona spp. and Acartia spp. Results of feeding experiments showed that grazing impacts on phytoplankton ranged from −5.9 to 17.7%, while the mean impacts were just <4% at both stations. The impacts were size-dependent, by which mesozooplankton consumed around 9% of large-sized phytoplankton while indirectly caused an increase of 4% of small-sized phytoplankton. Mesozooplankton clearance rate on phytoplankton, calculated from the log response of chlorophyll a concentrations by the introduction of bulk grazers after 1-day incubation, was significantly reduced by increasing carnivory degree of the mesozooplankton assemblage. The mechanism for the reduction of mesozooplankton clearance rate with increasing carnivory degree was primarily due to less efficient of filtering feeding and stronger trophic cascades due to suppression of microzooplankton. The feeding rates of mesozooplankton on microzooplankton were not obtained in this study, but the trophic cascades indirectly induced by mesozooplankton carnivorous feeding can be observed by the negative clearance rate on small-sized phytoplankton. Overall, the main significance of this study is the empirical relationship between carnivory degree and clearance rate, which allow researchers to potentially predict the herbivory of mesozooplankton in the nature without conducting feeding experiments.

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“…We can compare P. avirostris to another important filter feeder in coastal waters as well. The appendicularians perform similarly well at equivalent food concentrations (Table 4), with the peculiarity that they also can do well in richer waters and ingest bacterioplankton (Scheinberg et al 2005). Having a similar or even better feeding performance than P. avirostris, it is not clear why appendicularians do not dominate summer coastal waters in the NW Mediterranean (Calbet et al 2001).…”

Section: Feeding Performance Of Penilia Avirostrismentioning

confidence: 92%

Feeding ecology of the marine cladoceran Penilia avirostris: natural diet, prey selectivity and daily ration

Atienza

Saiz²,

Calbet³

2006

Mar. Ecol. Prog. Ser.

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Penilia avirostris is an important component of the mesozooplankton of shelf waters during the stratification period. This study investigates the feeding ecology of P. avirostris under natural dietary conditions in the NW Mediterranean during their summer appearance. The results indicate that P. avirostris feeds on particles in a wide size range, mostly on nanoplankton (2 to 20 µm), including larger prey such as dinoflagellates and ciliates. Autotrophic and heterotrophic bacteria were not grazed on, but picoflagellates (< 2 µm) were significant contributors to diet, indicating a narrow threshold of lower prey size. Ciliates were cleared at low rates which, at times, were not significant, probably because of their ability to escape feeding currents. Although this marine cladoceran is considered to behave like a filter feeder, our results indicate that it can display variable selectivity patterns that do not only depend on prey size. During the strict oligotrophic conditions that were present in summer NW Mediterranean waters, daily rations of P. avirostris averaged 82% body C d -1 (range: 26 to 157%). Such feeding rates seem to be an adaptation to allow them to succeed under low food conditions and outcompete other components of the marine zooplankton, such as copepods.

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Grazing of two common appendicularians on the natural prey assemblage of a tropical coastal ecosystem

Cited by 60 publications

References 39 publications

Mesozooplankton biomass and abundance in Cyprus coastal waters and comparison with the Aegean Sea (eastern Mediterranean)

Mesozooplankton biomass and abundance in Cyprus coastal waters and comparison with the Aegean Sea (eastern Mediterranean)

Seasonal Variability of Mesozooplankton Feeding Rates on Phytoplankton in Subtropical Coastal and Estuarine Waters

Feeding ecology of the marine cladoceran Penilia avirostris: natural diet, prey selectivity and daily ration

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