Effects of freshwater flow and phytoplankton biomass on growth, reproduction, and spatial subsidies of the estuarine copepod Pseudodiaptomus forbesi

We examined how freshwater flow and phytoplankton biomass affected abundance and population dynamics of the introduced subtropical copepod Pseudodiaptomus forbesi in brackish and freshwater regions of the San Francisco Estuary, California, USA. This copepod is key prey for the endangered and food-li...

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Bibliographic Details
Published in:	Hydrobiologia Vol. 807; no. 1; pp. 113 - 130
Main Authors:	Kimmerer, Wim J., Ignoffo, Toni R., Kayfetz, Karen R., Slaughter, Anne M.
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-02-2018 Springer Springer Nature B.V
Subjects:	Abundance Analysis Aquatic crustaceans Autumn Biomass Biomedical and Life Sciences Brackishwater environment Chlorophyll Chlorophylls Copepoda Developmental stages Dynamics Ecology Estuaries Estuarine dynamics Fish Fishes Flow Food Food supply Foods Fresh water Freshwater Freshwater & Marine Ecology Freshwater environments Hypomesus transpacificus Inland water environment Life Sciences Nauplii Phytoplankton Plankton Population biology Prey Primary Research Paper Pseudodiaptomus forbesi Ratios Saline water Salinity Salinity effects Subsidies Summer Water Zoology USA, California, San Francisco Estuary Food webs Food limitation Reproductive rate Growth rate Development pattern
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Summary:	We examined how freshwater flow and phytoplankton biomass affected abundance and population dynamics of the introduced subtropical copepod Pseudodiaptomus forbesi in brackish and freshwater regions of the San Francisco Estuary, California, USA. This copepod is key prey for the endangered and food-limited delta smelt, Hypomesus transpacificus , in low-salinity water during summer–autumn. Long-term monitoring data showed that P. forbesi was most abundant in fresh water, where summer–autumn abundance was invariant with freshwater flow. Abundance was positively related to freshwater flow in low-salinity water. Reproductive rates in both regions during 2010–2012 were low and unresponsive to chlorophyll or freshwater flow. Development indices, calculated as ratios of laboratory-derived to field-derived stage durations, were lowest for nauplii and highest for late copepodites, but averaged below 0.5 for all stages combined. Development indices were weakly related to chlorophyll for late copepodites only, unrelated to freshwater flow, and slightly higher in low-salinity than fresh water. Thus, the principal mechanism by which flow affects the P. forbesi population is apparently transport of copepods from fresh water to low-salinity water, where copepods are available to delta smelt. This work demonstrates how freshwater flow affects estuarine foodwebs through spatial subsidies of food supply.
ISSN:	0018-8158 1573-5117
DOI:	10.1007/s10750-017-3385-y