The effect of mating behavior and temperature variation on the critical population density of a freshwater copepod

Kramer, Andrew M.; Sarnelle, Orlando; Yen, Jeannette

doi:10.4319/lo.2011.56.2.0707

Cited by 13 publications

(14 citation statements)

References 47 publications

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“…Recent copepod-population growth models suggest that small population densities (Choi andKimmerer 2008, 2009) and biased sex ratios (Kiørboe 2007(Kiørboe , 2008 decrease copepod mating success and subsequent population growth by reducing mate-encounter rates (Kiørboe and Bagøien 2005;Visser and Kiørboe 2006;Kramer et al 2011). Here, we show in small (20-mL) vessels, where encounter rates are not limiting, that E. herdmani mating success is significantly reduced by the presence of a predator cue.…”

Section: Discussionsupporting

confidence: 45%

“…Traditionally, population growth experiments have centered on the effects that environmental factors such as temperature and food concentration have on copepod egg production rate (Checkley 1980;Huntley and Lopez 1992;Mauchline 1998). However, more recent theoretical and experimental studies indicate that demographic factors, such as population density and sex ratio, also strongly affect population growth rates for copepods (Choi and Kimmerer 2008;Kiørboe 2008;Kramer et al 2008).…”

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confidence: 99%

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Predation risk suppresses mating success and offspring production in the coastal marine copepod, Eurytemora herdmani

Lasley-Rasher

Yen

2012

Limnology & Oceanography

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We investigated the effects of a common mysid predator, Neomysis americana on the mating success of an estuarine copepod, Eurytemora herdmani. The presence of a mysid predator, or only a predator cue, reduced copulation frequency and spermatophore transfer success of E. herdmani, and led to a substantial decrease in E. herdmani nauplius production. Thus, mysid predators can influence copepod population growth through nonconsumptive processes by reducing the frequency and success of mating events. This highlights the need to look beyond population-level demographic factors (i.e., sex ratio and population density) and consider community-level ecological factors (such as predation risk) when modeling population growth rates of prey species critical to marine food webs.

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Section: Discussionsupporting

confidence: 45%

mentioning

confidence: 99%

Predation risk suppresses mating success and offspring production in the coastal marine copepod, Eurytemora herdmani

Lasley-Rasher

Yen

2012

Limnology & Oceanography

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“…Consistent with many studies (Keitt et al , Wang and Kot , Wang et al ), increasing the Allee parameter slowed the mean rate of spread. These and other studies, however, represented Allee effects using a constant value and our findings, motivated by growing recognition of spatiotemporal variability in Allee effects (Tobin et al , Kramer and Drake , Kramer et al , Walter et al ), add nuance to predictions of range expansion in heterogeneous landscapes. We found that spatial variations in Allee effects, and the structure of the variation, can drive deviations from predictions generated assuming a spatially constant Allee effect (Table , Fig.…”

Section: Discussionmentioning

confidence: 63%

“…Despite difficulties of detecting demographic Allee effects (Gregory et al 2010), these theoretical predictions are supported by a number of empirical studies (Davis et al 2004, Taylor et al 2004, Tobin et al 2007, Lynch et al 2014. There is also growing evidence that Allee effects may vary in time and space (Angulo et al 2007, Tobin et al 2007, Kramer and Drake 2010, Kramer et al 2011, Walter et al 2015), yet theoretical studies have largely considered Allee effects to be constant. The present study investigates how spatial variability in Allee effects influences patterns of range expansion using a theoretical model simulated on different Allee effect landscapes.…”

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confidence: 99%

Spatial variation in Allee effects influences patterns of range expansion

2016

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Allee effects are thought to slow range expansion and contribute to stable range boundaries. Recent studies have shown Allee effects to vary spatiotemporally due to influences of environmental heterogeneity on population processes. Gradients in Allee effects might occur as a species' range approaches suboptimal conditions while expanding into new territory. Allee effects could exhibit patchiness if drivers of positive density dependence (e.g. mate finding rates) are influenced by habitat patchiness. However, theoretical studies have largely assumed Allee effects to be spatially constant. The goal of this study was to evaluate how spatiotemporal patterns of range expansion respond to spatial variations in Allee effects. We simulated spread in landscapes that differed in the spatial configuration and range of Allee thresholds. We compared spread with a constant Allee effect to spread in landscapes where the Allee threshold varied along a gradient or in a patchy fashion. Landscape configuration affected patterns of range expansion when Allee thresholds were near or exceeded the number of colonizing immigrants. In gradient landscapes, spread decelerated as the range edge approached higher Allee thresholds. In patchy landscapes, spread advanced quickly through areas with lower Allee thresholds and stalled in areas with higher Allee thresholds. Both focal and neighboring locations influenced spread. Spatial variation in Allee effects may be an underappreciated source of heterogeneity in patterns of range expansion. When Allee effects vary, spread estimates based on a spatially averaged Allee threshold may not accurately predict realized rates of spread. Our findings suggest that spread can occur despite generally high Allee thresholds if Allee thresholds are low in a subset of patches. This result has negative implications for controlling the spread of invasive species, but it also suggests range shifts by native species in response to climate change may be possible with even sparsely distributed refugia from Allee effects.

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“…The processes associated with reproduction can be disturbed by increasing viscosity. By reducing their ability to accomplish biological processes, lower temperatures may reduce the fitness of the species (Kramer et al 2011). Con sequently, the lower temperature condition could significantly exert selective pressures governing T. longicornis behaviour.…”

Section: Ecological Consequencesmentioning

confidence: 99%

Effect of temperature on Temora longicornis swimming behaviour: illustration of seasonal effects in a temperate ecosystem

Moison¹,

Schmitt²,

Souissi³

2012

Aquat. Biol.

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The present study investigated the effect of temperature on male and female swimming activity of the calanoid copepod Temora longicornis, sampled during winter (February) and summer (August) in the English Channel coastal ecosystem. Video recordings were conducted at 3 temperatures representative of those to which these organisms are normally exposed (13, 16 and 20°C) and one extreme-event temperature (24°C). Examinations of instantaneous velocity and symbolic analysis (i.e. dynamics of swimming states discretized from time series of instantaneous velocity) showed that T. longicornis changed its behaviour when confronted with environmental temperature variations. Swimming speed increased as temperature increased. In warmer water, this copepod displayed higher swimming activity, break periods were less frequent, and the frequency of jumps increased. This phenomenon was amplified when the environmental temperature was increased to 24°C. These observations revealed a considerable tolerance to high temperatures and an ability to adjust to environmental temperature changes. The 'summer population' was less active in the low temperature range, but the swimming speed reached a higher value at higher temperatures than that shown by the 'winter population'. The results of the present study highlighted changes in the individual behaviour of this copepod in response to changing seasonal conditions in the form of swimming activity, and thus its ability to maintain biological processes throughout the year, even in a restrictive environment. KEY WORDS: Copepod · Swimming behaviour · Temperature effect · Seasonal variation · Temora longicornis · Symbolic dynamicsResale or republication not permitted without written consent of the publisher Aquat Biol 16: 149-162, 2012 ronment, copepods have developed a range of strategies, including a wide spectrum of swimming behaviour to search for food (Tiselius 1992, van Duren & Videler 1995 and sexual partners (van Duren & Videler 1996 and to avoid predators (van Duren & Videler 1996, Tiselius et al. 1997. The patterns of zooplankton swimming behaviour may be affected by changing temperature con ditions, i.e. either no change (Metridia longa, Hirche 1987; Calanus finmarchicus, Lenz et al. 2005), or a decrease (Acartia tonsa, and C. glacialis, Hirche 1987, Larsen et al. 2008 or a rise in swimming activity during warmer conditions (Lenz et al. 2005).The effect of seasonal temperature variation on the swimming velocity of copepods, especially Temora longicornis, is not well known, although this variation may be important in the aquatic environment. With rising temperatures in the northern hemisphere (Levitus et al. 2000(Levitus et al. , 2005, there is a need to study behavioural observations in relation to variations in environmental temperature. This, in turn, will give us a better understanding of natural selection processes and their implications on larger-scale mechanisms such as spatial distribution (Beaugrand et al. 2002), demography and dynamic of the populations and co...

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The effect of mating behavior and temperature variation on the critical population density of a freshwater copepod

Cited by 13 publications

References 47 publications

Predation risk suppresses mating success and offspring production in the coastal marine copepod, Eurytemora herdmani

Predation risk suppresses mating success and offspring production in the coastal marine copepod, Eurytemora herdmani

Spatial variation in Allee effects influences patterns of range expansion

Effect of temperature on Temora longicornis swimming behaviour: illustration of seasonal effects in a temperate ecosystem

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