The distribution and abundance of benthic cyclopoid copepods in Esthwaite Water, Cumbria

Tinson, Stuart; Laybourn‐Parry, Johanna

doi:10.1007/bf00008858

Cited by 12 publications

(4 citation statements)

References 17 publications

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“…We rarely found Frontonia leucas in either the water column or the benthos, yet this species was relatively common reaching maximum densities of 194 ml-' at 15 metres in 1969 (Goulder, 1974) and around 500 l-' in the plankton in 1977 (Bark, 1981). The present paucity of F. leucas is difficult to explain without physiological data, but the lake has become more eutrophic in recent decades and marked changes have been observed in the abundance of other groups, such as the microcrustacea for example (Tinson & Laybourn-Parry, 1986). We also found large populations of Plagiopyla in both the benthos and the plankton at 15.5 metres during stratification.…”

Section: Discussionmentioning

confidence: 72%

The hypolimnetic protozoan plankton of a eutrophic lake

1990

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The seasonal distribution of benthic species in the water column above and below the thermocline in a small eutrophic lake is described. During summer stratification populations of Spirostomum spp, Loxodes spp., Plagiopyla and Deltopylum become established in the plankton on or below the oxycline/thermocline. At shallow sites no migration occurred and populations of the migratory species in the benthos were sparse, with the exception of Plagiopyla which occurred in high densities in the sediment. Two distinct planktonic populations are established during stratification: an epilimnetic community of obligate planktonic ciliates and a hypolimnetic community of benthic migrants.

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Section: Discussionmentioning

confidence: 72%

The hypolimnetic protozoan plankton of a eutrophic lake

1990

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“…Benthic survey data for M. albidus and M. viridis (as Acanthocyclops viridis) derived from Tinson and Laybourn-Parry (1986) were used to calculate RCP based on maximum field abundances using pooled bootstrapped mean maximum feeding and attack rates across all three temperatures. To calculate RCP using fecundity, we used results from Laybourn-Parry et al (1988) to discern the proportion of total consumed energy devoted to reproduction across corresponding temperatures for the two copepods:…”

Section: Data Manipulation and Statistical Analysesmentioning

confidence: 99%

Biological control agent selection under environmental change using functional responses, abundances and fecundities; the Relative Control Potential (RCP) metric

2018

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We currently lack the capacity to rapidly and reliably predict the efficacy of biological control agents due to inadequate consistency in derivations of functional and numerical responses and potential effects of context-dependencies. Here, we propose and apply a novel metric, Relative Control Potential (RCP), which combines the functional response (FR, per capita effect) with proxies for the numerical response (NR, agent population response) to compare agent efficacies, where RCP = FR × abundance (or other proxies e.g. fecundity). The RCP metric is a comparative ratio between potential biocontrol agents, where values > 1 indicate higher relative control efficacy. Further, RCP can compare the efficacy of agents under environmental contexts, such as temperature change. We thus derived the RCP for two predatory cyclopoid copepods, Macrocyclops albidus (Cyclopoida: Cyclopidae) and Megacyclops viridis (Cyclopoida: Cyclopidae), towards larvae of the mosquito Culex pipiens (Diptera: Culicidae) under temperatures representative of current and future climate. Both copepods exhibited potentially population destabilising Type II FRs, with increasing temperatures inducing greater magnitude FRs through increased attack rates and decreased handling times. Attack rates by M. albidus were higher than M. viridis, yet handling times and maximum feeding rates were similar between the species across all temperatures. The inclusion of abundance data drives an elevated RCP of M. albidus and the integration of fecundity drives greater RCP of M. albidus at peak temperatures. Q10 values are indicative of increased feeding activity by both copepods with temperature increases, however relative feeding level increases of M. viridis slowed towards the peak temperature. We present RCP calculations and biplots that represent the comparative efficacies of the two biological control agents across temperatures. The Relative Control Potential (RCP) metric thus provides a new tool for practitioners to better assess the potential efficacy of biocontrol agents before their integration into management approaches for pests, vectors and invasive species.

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“…School of Pure and Applied Biology, UWCC. PO Box 915, Cardiff CFl 3TL, U.K. bution (Fryer, 1985;Sarvala, 1986;Tinson & Layboum-Parry, 1986) and production (Strayer & Likens, 1986;Rasmussen. 1988) in standing waters are well documented, and they are of major importance in the trophic dynamics of both the littoral and pelagic communities.…”

Section: Introductionmentioning

confidence: 99%

The influence of chemistry and habitat features on the microcrustacea of some upland Welsh streams

Rundle

Ormerod

1991

Freshwater Biology

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1. Microcrustaceans were sampled during September 1990 from three microhabitats (margins, stony riffles and gravel) at thirteen stream sites in mid-Wales.2. Patterns in the distribution, abundance and community structure of microcrustacean taxa were related to stream chemistry, physiography, substratum composition and marginal habitat structure. Patterns of distribution between microhabitats were also assessed.3. Chemical variables were the strongest correlates with microcrustacean parameters. Total numbers of microcrustaceans and harpacticoid copepods were reduced at sites with high aluminium concentrations, and ostracods were scarce or absent at the most acidic sites. In contrast, cyciopoid copepods were more abundant and species rich at low pH.4. Microcrustacean communities were most species rich at sites with a high percentage cover of macrophytes on the substratum. Cladoceran species richness and abundance, and the abundance of several microcrustacean species, were also positively correlated with percentage macrophyte cover. 5. Three site groupings produced by TWINSPAN classification were primarily related to percentage macrophyte cover and marginal habitat structure, with chemistry and land use also of importance.6. Total microcrustacean abundance was highest in margins, but of all the species, only the harpacticoid Bryocamptus cuspidatus showed a strong microhabitat preference.

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The distribution and abundance of benthic cyclopoid copepods in Esthwaite Water, Cumbria

Cited by 12 publications

References 17 publications

The hypolimnetic protozoan plankton of a eutrophic lake

The hypolimnetic protozoan plankton of a eutrophic lake

Biological control agent selection under environmental change using functional responses, abundances and fecundities; the Relative Control Potential (RCP) metric

The influence of chemistry and habitat features on the microcrustacea of some upland Welsh streams

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