Population dynamics and estimates of production for the calanoid copepod Pseudodiaptomus hessei in a warm temperate estuary

Jerling, H.L.; Wooldridge, T.

doi:10.1016/0272-7714(91)90002-s

Cited by 60 publications

(21 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar patterns have been seen in other Pseudodiaptomus species (Uye et al, 1983). The ratio of duration of copepodite to nauplius stages (Dc/ Dn) for P. forbesi (1.49 ± 0.06) fell between values reported for P. hessei (1.15-1.46 at four temperatures; Jerling & Wooldridge, 1991) and P. marinus (1.7, Uye et al, 1983). Other estuarine genera such as Eurytemora have similar ratios (Ban, 1994;Devreker et al, 2007).…”

supporting

confidence: 74%

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

et al. 2017

View full text Add to dashboard Cite

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 summerautumn. 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.

show abstract

supporting

confidence: 74%

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

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Warmer conditions and nutrient inputs boost productivity in estuaries, thereby facilitating increased food availability, faster growth and development of fish larvae during spring and summer (Hays et al 2005, Islam et al 2006, Strydom 2015. Mesohaline or ETM zones at the river-estuary interface are usually highly productive (Jerling andWooldridge 1991, Snow et al 2000) and likely to support a high density of fish larvae, as previously observed by Islam et al (2006) and Strydom (2015), and also evident in the current study. Conversely, low densities of R. holubi larvae were observed in euhaline and hypersaline zones.…”

Section: Discussionsupporting

confidence: 67%

Modelling the occurrence of postflexion stages of a marine estuarine-dependent fish in temperate South African estuaries

et al. 2017

View full text Add to dashboard Cite

Summary:The movement of postflexion larvae of marine estuarine-dependent species into estuaries is critical for the survival of fishes reliant on estuaries as nurseries. However, detailed studies focused on environmental variability experienced by postflexion larvae entering a range of estuary types under varying conditions are rare. This study assessed the in situ conditions (temperature, salinity and water clarity) under which the southern African endemic fish Rhabdosargus holubi (Sparidae) recruits into estuaries. Postflexion larvae were sampled in three biogeographic regions (cool temperate, warm temperate and subtropical boundary), which included three estuary types (permanently open estuaries (POEs), temporarily open/closed estuaries and estuarine lake systems) on a seasonal basis, independent of each other. Rhabdosargus holubi larvae were more abundant in spring and summer, in POEs in the warm temperate region. Models predicted that higher larval occurrence in estuaries is a function of lower salinity (e.g. mesohaline zones of 5-17.9 salinity) and lower water clarity (e.g. 0-0.2 K d , light extinction coefficient), particularly for warm, temperate POEs. This re-emphasizes the importance of freshwater for optimal nursery functioning, which may be compromised by impoundments, abstraction and climate change in water-short countries like South Africa.Keywords: biogeography; fish larvae; recruitment; Rhabdosargus holubi; salinity; turbidity. Modelización de la aparición de larvas en estadio de postflexión de un pez estuárico dependiente en los estuarios templados de SudáfricaResumen: En las especies de peces dependientes de los estuarios marinos como zonas de cría, el movimiento de las larvas en estadio de postflexión hacia el interior de los estuarios es un proceso crítico para su supervivencia. Sin embargo, son raros los estudios detallados que analicen la variabilidad ambiental experimentada por estas larvas en diversos ambientes estuáricos. Este estudio evaluó las condiciones in situ (temperatura, salinidad y claridad del agua) bajo las que Rhabdosargus holubi (Sparidae), pez endémico de África meridional, recluta en los estuarios. Las larvas en postflexión se muestrearon estacionalmente en tres regiones biogeográficas, independientes entre sí, (templada-fría, templada-cálida y subtropical), que incluían tres tipos de estuarios (POE: estuarios permanentemente abiertos, TOC: estuarios temporalmente abiertos/cerrados y ELS: sistemas de lagos estuarinos). Las larvas de Rhabdosargus holubi fueron más abundantes durante la primavera y el verano, en POEs de la región templada-cálida. Los modelos predijeron que la mayor aparición de larvas en los estuarios es función de una menor salinidad (por ejemplo, zonas mesohalinas de 5-17.9 salinidad) y una menor claridad del agua (por ejemplo con coeficiente de extinción de luz de 0-0.2 K d ), particularmente para POEs templado-cálidos. Esto reafirma la importancia del agua dulce para el funcionamiento óptimo como zona de cría, que puede verse comprometida por los embalse...

show abstract

“…As there are no sexspecific data on stage duration of CV males or females we have assumed these are equal in our estimate of mortality. However, the stage duration of CV males is typically somewhat less than females in copepods (Uye et al 1983, Jerling & Wooldridge 1991, Devreker et al 2007, and allowing for such a difference would tend to increase the mortality of CV-adult males relative to CV-adult females.…”

Section: Mortalitymentioning

confidence: 99%

Spring mortality of the cyclopoid copepod Oithona similis in polar waters

Hirst¹,

Ward²

2008

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Population dynamics and estimates of production for the calanoid copepod Pseudodiaptomus hessei in a warm temperate estuary

Cited by 60 publications

References 40 publications

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

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

Modelling the occurrence of postflexion stages of a marine estuarine-dependent fish in temperate South African estuaries

Spring mortality of the cyclopoid copepod Oithona similis in polar waters

Contact Info

Product

Resources

About