Size‐specific grazing and competitive interactions between large salps and protistan grazers
Size‐specific grazing and competitive interactions between large salps and protistan grazers
复制标题
大型樽海鞘和原生食草动物之间的尺寸特异性放牧和竞争性相互作用
DOI:
10.1002/lno.11770
复制
发表时间:
2021
影响因子:
4.5
通讯作者:
Gutiérrez‐Rodríguez, Andres
中科院分区:
文献类型:
--
作者:
Stukel, Michael R.;Décima, Moira;Selph, Karen E.;Gutiérrez‐Rodríguez, Andres
We investigated competition betweenSalpa thompsoniand protistan grazers during Lagrangian experiments near the Subtropical Front in the southwest Pacific sector of the Southern Ocean. Over a month, the salp community shifted from dominance by large (> 100 mm) oozooids and small (< 20 mm) blastozooids to large (~ 60 mm) blastozooids. Phytoplankton biomass was consistently dominated by nano‐ and microphytoplankton (> 2μm cells). Using bead‐calibrated flow‐cytometry light scatter to estimate phytoplankton size, we quantified size‐specific salp and protistan zooplankton grazing pressure. Salps were able to feed at a > 10,000 : 1 predator : prey size (linear‐dimension) ratio. Small blastozooids efficiently retained cells > 1.4μm (high end of picoplankton size, 0.6–2μm cells) and also obtained substantial nutrition from smaller bacteria‐sized cells. Larger salps could only feed efficiently on > 5.9μm cells and were largely incapable of feeding on picoplankton. Due to the high biomass of nano‐ and microphytoplankton, however, all salps derived most of their (phytoplankton‐based) nutrition from these larger autotrophs. Phagotrophic protists were the dominant competitors for these prey items and consumed approximately 50% of the biomass of all phytoplankton size classes each day. Using a Bayesian statistical framework, we developed an allometric‐scaling equation for salp clearance rates as a function of salp and prey size: where ESD is prey equivalent spherical diameter (µm), TL isS. thompsonitotal length,φ= 5.6 × 10−3± 3.6 × 10−4,ψ= 2.1 ± 0.13,θ= 0.58 ± 0.08, andγ= 0.46 ± 0.03 and clearance rate is L d‐1salp‐1. We discuss the biogeochemical and food‐web implications of competitive interactions among salps, krill, and protozoans.
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影响因子:
2.5
作者:
M. Latasa;Joachim Henjes;R. Scharek;P. Assmy;R. Röttgers;V. Smetácek
通讯作者:
V. Smetácek
DOI:
--
发表时间:
1985
期刊:
影响因子:
--
作者:
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通讯作者:
J. Bradford
DOI:
--
发表时间:
1995
期刊:
影响因子:
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作者:
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作者:
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