Recruitment patterns, low cannibalism and reduced interspecific predation contribute to high invasion success of two Pacific crabs in northwestern Europe

Geburzi, Jonas C.; Brandis, Dirk; Buschbaum, Christian

doi:10.1016/j.ecss.2017.11.032

Cited by 22 publications

(22 citation statements)

References 63 publications

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“…As it is well described in the literature, invasive species tend to be overall better at enduring disturbances than native species 48,49 , possibly explaining parts of the wide temperature tolerance of H. takanoi (see also 50,51 ). In line with this, recent studies have shown that H. takanoi is a successful invader, and a more competitive species than other crabs such as the European shore crab C. maenas and the Asian shore crab H. sanguineus 45,52 . Overall, this experimental work suggests a wide temperature tolerance of H. takanoi and effective compensation mechanism in place that are partly fuelled through increased feeding, suggesting an increasing invasion success in a future ocean of increased mean temperatures and stronger temperature variability.…”

Section: Discussionmentioning

confidence: 56%

Warming and temperature variability determine the performance of two invertebrate predators

Lugo

Baumeister

Nour

et al. 2020

Sci Rep

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In a warming ocean, temperature variability imposes intensified peak stress, but offers periods of stress release. While field observations on organismic responses to heatwaves are emerging, experimental evidence is rare and almost lacking for shorter-scale environmental variability. for two major invertebrate predators, we simulated sinusoidal temperature variability (±3 °C) around todays' warm summer temperatures and around a future warming scenario (+4 °C) over two months, based on highresolution 15-year temperature data that allowed implementation of realistic seasonal temperature shifts peaking midpoint. Warming decreased sea stars' (Asterias rubens) energy uptake (Mytilus edulis consumption) and overall growth. Variability around the warming scenario imposed additional stress onto Asterias leading to an earlier collapse in feeding under sinusoidal fluctuations. Highpeak temperatures prevented feeding, which was not compensated during phases of stress release (low-temperature peaks). In contrast, increased temperatures increased feeding on Mytilus but not growth rates of the recent invader Hemigrapsus takanoi, irrespective of the scale at which temperature variability was imposed. This study highlights species-specific impacts of warming and identifies temperature variability at the scale of days to weeks/months as important driver of thermal responses. When species' thermal limits are exceeded, temperature variability represents an additional source of stress as seen from future warming scenarios.Global climate change is known to have profound impacts on marine ecosystems that range from distributional shifts and changes in species interactions to shifts in ecosystem function and diversity 1-4 . However, current knowledge on the impacts of climate change is based on experiments testing the effects of mean changes of stressors, rather than considering variability around means, or the role of climate extremes 5 .Environmental variability occurs at a variety of temporal (and spatial scales), from tidal to diurnal, over stochastic weekly to monthly patterns, and seasonal cycles, to large-scale inter-anneal variability. Irrespective of scale, this variability can impact organisms differently than changes in mean temperature (i.e. trends) 5,6 . High peaks of stressful temperatures might be lethal 7,8 , while excursions to below-stressful conditions can allow for stress relaxation 9 . Thus, in a warming ocean with already stressful mean temperature conditions 10 , environmental variability towards lower temperatures might create vital refuge from stress 9,11 . More theoretically, Jensen's inequality hypothesis postulates for non-linear functions (bell-shaped thermal performance curves, with an intermediate optimum), any variation around the mean should rise or lower the performance of an organism, when compared to constant environmental conditions 12 .Coastal waters are amongst the most valuable and productive ecosystems worldwide, providing a wide range of ecosystem services 1,13 . In the context of global climat...

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Section: Discussionmentioning

confidence: 56%

Warming and temperature variability determine the performance of two invertebrate predators

Lugo

Baumeister

Nour

et al. 2020

Sci Rep

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“…First of all, they suggest that the invasive crabs exert predation pressure on the same size classes of native mussels as the native crabs. As the invasive Hemigrapsus species can locally reach much higher densities than the native C. maenas in the areas where they co-occur (Van den Brink et al ., 2012; Landschoff et al ., 2013; Jungblut et al ., 2017; Van den Brink & Hutting, 2017; Geburzi et al ., 2018), this is probably leading to an increased predation pressure on native mussels. This in turn may have effects on local mussel densities with subsequent repercussions for other species depending on mussels.…”

Section: Discussionmentioning

confidence: 99%

“…Adult C. maenas may frequent these habitats occasionally during migrations from subtidal zones onto intertidal areas at high tide (Waser et al ., 2018). Hemigrapsus species seem to be superior to juvenile C. maenas in competition for shelter and adult crabs also predate more heavily on juvenile C. maenas than is the case the other way around (Jensen et al ., 2002; Griffen & Byers, 2006; Geburzi et al ., 2018). The negative effects on native crabs resulting from this interference competition and intra-guild predation may be exacerbated by additional resource competition.…”

Section: Discussionmentioning

confidence: 99%

Prey size selection in invasive (Hemigrapsus sanguineus and H. takanoi) compared with native (Carcinus maenas) marine crabs

et al. 2019

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Introductions of predators can have strong effects on native ecosystems and knowledge of the prey size selection of invasive predators is pivotal to understand their impact on native prey and intraguild competitors. Here, we investigated the prey size selection of two invasive crabs (Hemigrapsus sanguineus and Hemigrapsus takanoi) recently invading European coasts and compared them with native shore crabs (Carcinus maenas) which are known to feed on similar prey species. In laboratory experiments, we offered different size classes of native blue mussels (Mytilus edulis) to different size classes of the crab species in an effort to identify the respective prey size preferences and potential overlap in prey size range of native and invasive crabs. In all three species, the preferred prey size increased with crab size reflecting general predator–prey size relationships. Prey size preference did not differ among the crab species, i.e. crabs showed similar mussel size preference in relation to carapace width. Given that additional morphological measurements showed that both of the invasive crab species have much larger claws relative to their body size compared with the native species, this finding was surprising and may relate to differential claw morphologies or structural strength. These results suggest that the invasive crabs exert predation pressure on the same size classes of native mussels as the native crabs, with potential effects on mussel population dynamics due to the high densities of the invaders. In addition, the overlap in prey size range is likely to result in resource competition between invasive and native crabs.

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“…However, comparisons of data on winter temperatures for E England and S Norway versus sites where populations are present do not support such hypothesis. Winter seawater temperatures in E England and S Norway (> 7°C: Mathis et al ) are higher than those currently experienced by adults in the German Bight (< 4°C), where populations of H. sanguineus persist over the winter (Geburzi et al ). Such difference in winter temperature is likely to result from coastal waters of E England and S Norway being influenced by the inflow of North Atlantic water, bringing water from the warm north–eastern limb of the Atlantic Meridional Overturning Circulation (Otto et al , Huthnance et al ).…”

Section: Discussionmentioning

confidence: 99%

“…In North America, H. sanguineus was found in Delaware Bay (Atlantic coast) in the 1980s and then expanded northwards covering almost 10 degrees of latitude in the subsequent 30 yr (Stephenson et al ). In Europe, H. sanguineus was first recorded in the Dutch delta system in the late 1990s and then spread over the southern North Sea reaching Danish waters by 2012 (Jungblut et al , Geburzi et al ).…”

Section: Introductionmentioning

confidence: 99%

Exploring larval phenology as predictor for range expansion in an invasive species

et al. 2020

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Predicting range expansion of invasive species is one of the key challenges in ecology. We modelled the phenological window for successful larval release and development (WLR) in order to predict poleward expansion of the invasive crab Hemigrapsus sanguineus along the Atlantic coast of North America and north Europe. WLR quantifies the number of opportunities (in days) when larval release leads to a successful completion of the larval phase; WLR depends on the effects of temperature on the duration of larval development and survival. Successful larval development is a necessary requirement for the establishment of self-persistent local populations. WLR was computed from a mechanistic model, based on in situ temperature time series and a laboratory-calibrated curve predicting duration of larval development from temperature. As a validation step, we checked that model predictions of the time of larval settlement matched observations from the field for our local population (Helgoland, North Sea). We then applied our model to the North American shores because larvae from our European population showed, in the laboratory, similar responses to temperature to those of a North American population. WLR correctly predicted the northern distribution limit in North American shores, where the poleward expansion of H. sanguineus appear to have stalled (as of 2015). For north Europe, where H. sanguineus is a recent invader, WLR predicted ample room for poleward expansion towards NE England and S Norway. We also explored the importance of year-to-year variation in temperature for WLR and potential expansion: variations in WLR highlighted the role of heat waves as likely promoters of recruitment subsidising sink populations located at the distribution limits. Overall, phenological windows may be used as a part of a warning system enabling more targeted programs for monitoring.

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Recruitment patterns, low cannibalism and reduced interspecific predation contribute to high invasion success of two Pacific crabs in northwestern Europe

Cited by 22 publications

References 63 publications

Warming and temperature variability determine the performance of two invertebrate predators

Warming and temperature variability determine the performance of two invertebrate predators

Prey size selection in invasive (Hemigrapsus sanguineus and H. takanoi) compared with native (Carcinus maenas) marine crabs

Exploring larval phenology as predictor for range expansion in an invasive species

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