Some observations on the populations of Mysis relicta in Lough Neagh

Andrew, T. E.; Woodward, E. Malcolm S.

doi:10.1007/978-94-017-2117-2_16

Cited by 13 publications

(11 citation statements)

References 6 publications

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“…Nonetheless, our results suggest that the significantly greater interaction strengths of the invader compared with the native species in our ponds enabled the former to dominate the competitive interactions despite considerable functional similarity. Unlike the univoltine M. salemaai , the more active H. anomala has multiple broods in a single year and also has a higher brood size (Andrew & Woodward ; Borcherding, Murawski & Arndt ), which implies higher productivity and greater energy requirements. This asymmetry would likely predispose H. anomala to establish abundant populations in lakes that contain M. salemaai or other similar shrimp species (Audzijonyte & Vainola ) throughout the Northern Hemisphere.…”

Section: Discussionmentioning

confidence: 99%

Ecosystem‐level effects of a globally spreading invertebrate invader are not moderated by a functionally similar native

Penk

Irvine

Donohue

2015

Journal of Animal Ecology

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Biological invasions are a key element of human-induced global environmental change. However, lack of knowledge of the indirect consequences of invasions, combined with poor understanding of how their ecological effects depend upon competitive attributes of the receiving community, hinders our ability to manage and predict the effects of invasive species on ecosystems. We established an experiment using a combination of both additive and substitutive experimental designs to explore the effects of the globally spreading mysid shrimp Hemimysis anomala on the biological structure of outdoor pond mesocosms in the absence and presence of a functionally similar native competitor, Mysis salemaai. The naturally smaller H. anomala had considerably stronger effects on primary producers, multiple aspects of consumer assemblages and overall biological structure of the ponds in comparison with the functionally similar native. Moreover, the magnitude of these effects was generally independent of the presence of M. salemaai and even total mysid density. Hemimysis anomala reduced both the abundance and diversity of zooplankton assemblages significantly, triggering a strong trophic cascade on phytoplankton and a simultaneous increase of benthic invertebrate biomass. These findings indicate that invasion by H. anomala may exacerbate the effects of nutrient enrichment on lakes. Our results demonstrate that introduced species can, irrespective of the presence of functionally similar natives, induce complex changes to ecosystems that reach beyond direct consumptive effects. Moreover, the cascading indirect effects of invasion can exacerbate the impacts of other stressors. Disregarding the complexity of indirect effects therefore risks underestimating significantly the global ecological footprint of biological invasions.

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Section: Discussionmentioning

confidence: 99%

Ecosystem‐level effects of a globally spreading invertebrate invader are not moderated by a functionally similar native

Penk

Irvine

Donohue

2015

Journal of Animal Ecology

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“…5) and there were also negative temperature effects on adult survival (Table 1) and the time of embryo release. Tattersall & Tattersall (1951) note that Mysis breed at temperatures below 7 °C, a limit with which Andrew & Woodward (1993) concur, but the timing and duration of such temperatures has shifted over the last decade in L. Neagh. These results suggest the possibility of a cross generation effect: the correlations between these winter temperature variables and YCS supports this but further data are necessary to test such an effect.…”

Section: Discussionmentioning

confidence: 99%

“…There was no correlation between juvenile ( b juv ) and adult ( b ad ) growth rates. t i is the extrapolated date at which Mysis are estimated to be of 1.1‐mm CL, the size of the smallest free‐living juveniles recorded: t i was used as an estimate of the date of embryo release rather than an arbitrary choice of March 1 as the birth date (Andrew & Woodward, 1993). The date at which the last adult disappeared ( t f ) was estimated by extrapolation of the log (abundance + 1) – age regression for catch per net haul, as was the number of adult females remaining at the next embryo release date ( N s ).…”

Section: Methodsmentioning

confidence: 99%

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Effects of climatic change and eutrophication on the glacial relict, Mysis relicta, in Lough Neagh

Griffiths

2007

Freshwater Biology

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1. The glacial relict, Mysis relicta, which occurs mainly in unproductive cold water habitats, shows increased mortality rates in temperatures above 16-18°C. Using a 12-year data set the growth, mortality and fat stores of Mysis in Lough Neagh, an increasingly hypertrophic lake which lacks a thermal refuge and which is subject to warming, were investigated. 2. Mysis showed a significant reduction in fat stores on reaching sexual maturity, contrary to studies elsewhere. 3. The contributions of temperature and eutrophication (total phosphorus, chlorophyll-a concentrations) to growth, mortality and the timing and duration of developmental events were investigated by regression. 4. Water temperatures rose between 1994 and 2005 and the time when temperatures exceeded 16°C doubled over this period. Juvenile and adult growth rates declined and the duration of the juvenile stage increased in warmer years. Eutrophication also affected these variables but, in general, to a lesser extent than temperature. 5. Year class strength (YCS) declined by a factor of 10 over the study period. YCS was independent of temperature up to 2000°C degree days (>4°C) but declined steeply above that point. Temperature was more important than eutrophication in predicting mortality and YCS. YCS was positively correlated with the length of time water temperature was below 7°C, the upper temperature for Mysis breeding.6. An established bioenergetic model predicted that water temperature and the timing of embryo release would have appreciable effects on Mysis viability. It also indicated that Mysis would lose mass at summer temperatures, consistent with the observed fat decline.

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“…Other relevant zooplankton work includes that of Andrew (1992), , Edgar & Andrew (1990), , and Andrew & Woodward (1993).…”

Section: Study Areamentioning

confidence: 99%

Seasonality of Rotifers and Temperature in Lough Neagh, N. Ireland

Andrew¹,

Andrew²

2005

Hydrobiologia

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Long runs of seasonal rotifer population data allow analysis of seasonal occurrence using mathematical tools. The application of Fourier analysis to a 15 year dataset describes seasonality in simple mathematical terms. This facilitates comparison of population expression with potential population driving variables and provides a basic modelling tool. Results show that annual patterns of occurrence and density have linkages with annual maximum and minimum environmental temperature, although the exact relationships are not clear.

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Some observations on the populations of Mysis relicta in Lough Neagh

Cited by 13 publications

References 6 publications

Ecosystem‐level effects of a globally spreading invertebrate invader are not moderated by a functionally similar native

Ecosystem‐level effects of a globally spreading invertebrate invader are not moderated by a functionally similar native

Effects of climatic change and eutrophication on the glacial relict, Mysis relicta, in Lough Neagh

Seasonality of Rotifers and Temperature in Lough Neagh, N. Ireland

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