scholarly journals Can heat waves change the trophic role of the world’s most invasive crayfish? Diet shifts in Procambarus clarkii

PLoS ONE ◽  
2017 ◽  
Vol 12 (9) ◽  
pp. e0183108 ◽  
Author(s):  
Bruno M. Carreira ◽  
Pedro Segurado ◽  
Anssi Laurila ◽  
Rui Rebelo
Keyword(s):  
Procambarus Clarkii ◽  
Heat Waves ◽  
Invasive Crayfish ◽  
Diet Shifts ◽  
Trophic Role

scholarly journals Functional traits explain crayfish invasive success in the Netherlands

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tiedo van Kuijk ◽  
Jacobus C. Biesmeijer ◽  
Berry B. van der Hoorn ◽  
Piet F. M. Verdonschot
Keyword(s):  
The Netherlands ◽  
Biological Invasions ◽  
Functional Traits ◽  
Procambarus Clarkii ◽  
Functional Trait ◽  
Temperate Climate ◽  
Negative Effects ◽  
Invasive Crayfish ◽  
Aggression Level

AbstractBiological invasions by nonindigenous species can have negative effects on economies and ecosystems. To limit this impact, current research on biological invasions uses functional traits to facilitate a mechanistic understanding of theoretical and applied questions. Here we aimed to assess the role of functional traits in the progression of crayfish species through different stages of invasion and determine the traits associated with invasive success. A dataset of thirteen functional traits of 15 species currently occurring or available for sale in the Netherlands was evaluated. Six of these crayfish appeared invasive. Important traits distinguishing successful from unsuccessful invaders were a temperate climate in the native range, a medium to high egg count and producing more than one egg clutch per year. The most successful invaders had different functional trait combinations: Procambarus clarkii has a higher reproductive output, can migrate over longer distances and possesses a higher aggression level; Faxonius limosus is adapted to a colder climate, can reproduce parthenogetically and has broader environmental tolerances. Using a suit of functional traits to analyse invasive potential can help risk management and prevention. For example, based on our data Procambarus virginalis is predicted to become the next successful invasive crayfish in the Netherlands.

scholarly journals Recent Decadal Changes in Heat Waves over China: Drivers and Mechanisms

2019 ◽  
Vol 32 (14) ◽  
pp. 4215-4234 ◽  
Author(s):  
Qin Su ◽  
Buwen Dong
Keyword(s):  
Heat Waves ◽  
Asian Summer Monsoon ◽  
Early Period ◽  
Spatial Extent ◽  
Physical Processes ◽  
Southeastern China ◽  
Anthropogenic Aerosol ◽  
Asian Summer ◽  
Frequency Intensity

Abstract Observational analysis indicates significant decadal changes in daytime, nighttime, and compound (both daytime and nighttime) heat waves (HWs) over China across the mid-1990s, featuring a rapid increase in frequency, intensity, and spatial extent. The variations of these observed decadal changes are assessed by the comparison between the present day (PD) of 1994–2011 and the early period (EP) of 1964–81. The compound HWs change most remarkably in all three aspects, with frequency averaged over China in the PD tripling that in the EP and intensity and spatial extent nearly doubling. The daytime and nighttime HWs also change significantly in all three aspects. A set of numerical experiments is used to investigate the drivers and physical processes responsible for the decadal changes of the HWs. Results indicate the predominant role of the anthropogenic forcing, including changes in greenhouse gas (GHG) concentrations and anthropogenic aerosol (AA) emissions in the HW decadal changes. The GHG changes have dominant impacts on the three types of HWs, while the AA changes make significant influences on daytime HWs. The GHG changes increase the frequency, intensity, and spatial extent of the three types of HWs over China both directly via the strengthened greenhouse effect and indirectly via land–atmosphere and circulation feedbacks in which GHG-change-induced warming in sea surface temperature plays an important role. The AA changes decrease the frequency and intensity of daytime HWs over Southeastern China through mainly aerosol–radiation interaction, but increase the frequency and intensity of daytime HWs over Northeastern China through AA-change-induced surface–atmosphere feedbacks and dynamical changes related to weakened East Asian summer monsoon.

Trophic role of ambush-foraging hydromedusae in the White Sea

2013 ◽  
Vol 34 ◽  
pp. 153-164 ◽  
Author(s):  
Andrey A. Prudkovsky
Keyword(s):  
White Sea ◽  
The White Sea ◽  
Ambush Foraging ◽  
Trophic Role

scholarly journals Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

Crustaceana ◽  
2017 ◽  
Vol 90 (4) ◽  
pp. 417-435 ◽  
Author(s):  
R. J. Houghton ◽  
C. Wood ◽  
X. Lambin
Keyword(s):  
Relative Size ◽  
Pacifastacus Leniusculus ◽  
Gut Contents ◽  
Size Distributions ◽  
Signal Crayfish ◽  
Density Dependent ◽  
Invasive Crayfish ◽  
The Relationship ◽  
Best Fit

The role of cannibalism in crayfish populations is not well understood, despite being a potentially key density-dependent process underpinning population dynamics. We studied the incidence of cannibalism in an introduced signal crayfish Pacifastacus leniusculus population in a Scottish lowland river in September 2014. Animals were sampled using six different sampling techniques simultaneously, revealing variable densities and size distributions across the site. Cannibalism prevalence was estimated by analysing the gut contents of crayfish >20 mm CL for the presence of crayfish fragments, which was found to be 20% of dissected individuals. When seeking evidence of relationships between the sizes of cannibals and ‘prey’, the density of conspecifics <56% the size of a dissected individual yielded the best fit. The relationship between cannibalism probability and crayfish size and density was equally well described by three different metrics of crayfish density. Cannibalism increased with crayfish size and density but did not vary according to sex. These results suggest that large P. leniusculus frequently cannibalize smaller (prey) conspecifics, and that the probability of cannibalism is dependent upon the relative size of cannibal-to-prey and the density of the smaller crayfish. We suggest that removing large individuals, as targeted by many traditional removal techniques, may lead to reduced cannibalism and therefore a compensatory increase in juvenile survival.

scholarly journals Temporal fluctuations in the trophic role of large benthic sulfur bacteria in mangrove sediment

Food Webs ◽  
2016 ◽  
Vol 7 ◽  
pp. 20-28 ◽  
Author(s):  
Pierre-Yves Pascal ◽  
Olivier Gros ◽  
Henricus T.S. Boschker
Keyword(s):  
Mangrove Sediment ◽  
Temporal Fluctuations ◽  
Sulfur Bacteria ◽  
Trophic Role

scholarly journals Will climate change worsen your health?

2019 ◽  
Author(s):  
Joan Ballester
Keyword(s):  
Public Health ◽  
Policy Making ◽  
Heat Waves ◽  
Research Topic ◽  
Climate Factors ◽  
Social Differences ◽  
Ongoing Research ◽  
Science And Policy ◽  
Ambient Temperatures

Nearly 8% of deaths in Europe are due to ambient temperatures, and global warming represents an additional threat for public health. Despite the fact that we expect more frequent, intense and persistent heat waves during the present century, it is actually not clear whether the number of attributable deaths will also increase. Here I discuss why the role of early adaptation to temperature rise is a major ongoing research topic in science and policy-making, and how these eventual acclimatization processes depend on a myriad of non-climate factors such as the air quality in cities, social differences within and between societies, demographic changes or the evolution of the economy.

Marine Heat Waves in the Peruvian Upwelling System: from 5-day localized warming to year-long El Niños

2021 ◽  
Author(s):  
Alice Pietri ◽  
François Colas ◽  
Mogollon Rodrigo ◽  
Jorge Tam ◽  
Dimitri Gutierrez
Keyword(s):  
Hot Spots ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Spatial Organization ◽  
Coastal Upwelling ◽  
Heat Waves ◽  
Tropical Eastern Pacific ◽  
Coastal System ◽  
Upwelling System

&lt;p&gt;Extreme climatic events, such as marine heatwaves (MHWs), have been shown to globally increase in frequency and magnitude over the last decades, and can disrupt ecosystems significantly. Coastal upwelling systems, because they are biodiversity hot-spots and socioeconomic hubs, are particularly vulnerable to those rapidly developing anomalously warm marine events. The Peruvian coastal system in particular is highly exposed to climate variability because of its proximity to the equator. As such it is regularly impacted by El Ni&amp;#241;o events whose variability has been related to the longest and most intense MHWs in the region. However the intensively studied El Ni&amp;#241;o events tend to overshadow the MHWs of shorter duration that also have an important impact on the coastal environment as they can trigger other extreme events such as nearshore hypoxias and harmful algal blooms.&amp;#160;&lt;/p&gt;&lt;p&gt;Using 38 years of satellite sea surface temperature data, we investigate the characteristics (spatial variability, frequency, intensity and duration) and evolution of MHWs in the South Tropical Eastern Pacific, with a focus on the Peru Coastal Upwelling System. The separation of events by duration allows to identify a spectrum, from El Ni&amp;#241;o events to shorter scale MHWs. Results show that the statistical &amp;#160;distribution of MHWs properties, their spatial organization and preferential season of occurrence varies significantly in function of their duration. Besides, when removing large El Ni&amp;#241;o events, an increase of occurrences, duration and intensity is observed over the last 38 years, contrary to the reduction that is observed in the region when considering all MHWs. Finally, the possible drivers are discussed to disentangle the role of the local (wind stress) and remote (equatorial variability) forcing in function of the events duration.&lt;/p&gt;

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