scholarly journals Predator–prey interactions between native brine shrimp Artemia parthenogenetica and the alien boatman Trichocorixa verticalis: influence of salinity, predator sex, and size, abundance and parasitic status of prey

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3554 ◽  
Author(s):  
Vanessa Céspedes ◽  
Marta I. Sánchez ◽  
Andy J. Green
Keyword(s):  
Brine Shrimp ◽  
Life Stage ◽  
Predation Rate ◽  
Salt Ponds ◽  
Predator Prey ◽  
Caribbean Islands ◽  
Artemia Parthenogenetica ◽  
Introduced Range ◽  
Cladoceran Zooplankton ◽  
Predation Rates

Trichocorixa verticalis (T. verticalis), native to North America and the Caribbean islands, is an invasive waterboatman species (Corixidae) in the southwest of the Iberian Peninsula. Previous studies in the native range have suggested that predation by T. verticalis can regulate the abundance of Anostracan and Cladoceran zooplankton in saline ecosystems, causing increases in phytoplankton through a trophic cascade. In this experimental study, we tested the predator–prey relationship between the native brine shrimp Artemia parthenogenetica, and T. verticalis from the Odiel salt ponds in SW Spain. In three experiments, we investigated (1) the effects of Artemia life stage (metanauplii, juveniles, and adults), (2) abundance (three, six, and 12 adult Artemia) and (3) parasitic status (Artemia infected with avian cestodes or uninfected) on predation rates by T. verticalis. We also considered how predation rates in all three experiments were influenced by the sex of T. verticalis and by different salinities (25 and 55 g l−1). Experiment 1 showed that predation rates were highest for metanauplii, possibly because their photophilic behavior makes them more prone to predation. In Experiment 2, we found that predation rate was higher for female T. verticalis and the higher salinity, although the strength of the sex effect varied between treatments. Experiment 3 showed that T. verticalis selectively predated adult Artemia infected with cestodes (red in color), as previously reported for predation by avian final hosts. Collectively, these results indicate that T. verticalis are important predators in their introduced range, and are likely to reduce the abundance of Artemia in more salt ponds as they expand their range, thus increasing phytoplankton abundance through trophic cascades.

scholarly journals Lethal, behavioral, growth and developmental toxicities of alkyl-PAHs and non-alkyl PAHs to early-life stage of brine shrimp, Artemia parthenogenetica

2021 ◽  
Vol 220 ◽  
pp. 112302
Author(s):  
Yi Cong ◽  
Ying Wang ◽  
Mingxing Zhang ◽  
Fei Jin ◽  
Jingli Mu ◽  
...  
Keyword(s):  
Early Life ◽  
Brine Shrimp ◽  
Life Stage ◽  
Early Life Stage ◽  
Artemia Parthenogenetica ◽  
Behavioral Growth

The effect of chrysanthemum leaf trichome density and prey spatial distribution on predation of Tetranychus urticae (Acari: Tetranychidae) by Phytoseiulus persimilis (Acari: Phytoseiidae)

2003 ◽  
Vol 93 (4) ◽  
pp. 343-350 ◽  
Author(s):  
M.C. Stavrinides ◽  
D.J. Skirvin
Keyword(s):  
Tetranychus Urticae ◽  
Phytoseiulus Persimilis ◽  
Spatial Arrangement ◽  
Predation Rate ◽  
Trichome Density ◽  
Release Point ◽  
Predator Prey ◽  
Leaf Hairiness ◽  
Leaf Trichome ◽  
Prey Patches

AbstractThe effect of plant architecture, in terms of leaf hairiness, and prey spatial arrangement, on predation rate of eggs of the spider mite, Tetranychus urticae Koch, by the predatory mite Phytoseiulus persimilis Athias-Henriot was examined on cut stems of chrysanthemums. Three levels of leaf hairiness (trichome density) were obtained using two different chrysanthemum cultivars and two ages within one of the cultivars. The number of prey consumed by P. persimilis was inversely related to trichome density. At low prey densities (less than ten eggs per stem), prey consumption did not differ in a biologically meaningful way between treatments. The effect of prey spatial arrangement on the predation rate of P. persimilis was also examined. Predation rates were higher in prey patches on leaves adjacent to the release point of P. persimilis, but significantly greater numbers of prey were consumed in higher density prey patches compared to low density patches. The predators exhibited non-random searching behaviour, spending more time on leaves closest to the release point. The implications of these findings for biological control and predator–prey dynamics are discussed.

Bad news for bobtails: understanding predatory behaviour of a resource-subsidised corvid towards an island endemic reptile

2018 ◽  
Vol 45 (7) ◽  
pp. 595
Author(s):  
W. Oversby ◽  
S. M. Ferguson ◽  
R. A. Davis ◽  
P. W. Bateman
Keyword(s):  
Human Activity ◽  
Large Population ◽  
Camera Traps ◽  
Bad News ◽  
Human Settlement ◽  
Tourism Impacts ◽  
Predatory Behaviour ◽  
Predator Prey ◽  
Island Endemic ◽  
Predation Rates

Context Resource subsidisation as a result of urbanisation and other human activity can have positive impacts for some opportunistic predators. Many species of corvid have benefitted from the expansion of human-dominated habitats; however, their impacts on co-occurring prey fauna are generally poorly understood. Aims We aimed to test the hypothesis that urbanisation associated with tourism impacts the predator–prey relationship between Australian ravens, or wardongs (Corvus coronoides), a ubiquitous corvid of southern Australia, and Rottnest Island bobtails (Tiliqua rugosa konowi), a subspecies of bobtail lizard isolated to a small (19km2) island off the coast of Western Australia. Methods Using clay model lizards and camera traps, we assessed the wardongs’ attack rates by distance from the settlement and by whether the model was in closed or open habitat. Key Results We found that while wardongs preyed upon Rottnest Island bobtails, predation was not affected by proximity to human settlement despite the highest number of wardongs being found there. Models in closed vegetation were attacked by wardong significantly more than were those in open vegetation. Implications Increased predation rates in closed vegetation suggests that current revegetation efforts on the island may be increasing the availability of preferred hunting habitat for the wardong. This finding may influence decisions by management on whether to control the large population of wardongs on the island.

scholarly journals Does human influence on coastal grasslands habitats affect predation pressure on snakes?

2013 ◽  
Vol 13 (1) ◽  
pp. 366-370 ◽  
Author(s):  
Mauricio Beux dos Santos ◽  
Mauro Cesar Lamim Martins de Oliveira ◽  
Tatiane Penteado Gonçalves ◽  
Francis de Mattos Almeida ◽  
Daniel Loebmann ◽  
...  
Keyword(s):  
South America ◽  
Interspecific Interactions ◽  
Predation Rate ◽  
Predation Pressure ◽  
Key Factors ◽  
Human Influence ◽  
Real Effect ◽  
The Real ◽  
Disturbed Areas ◽  
Predation Rates

The loss and modification of habitats by humans have been considered key factors in the decline of diversity of species worldwide. However, the real effect caused by these disturbances on the biota is still poorly understood. The assessment of the changes in the network of interspecific interactions, such as predation rates on the native fauna, can be an important tool to diagnose the functionality of disturbed ecosystems. In this study we evaluate the predation rate on snakes in coastal grasslands in South America under human influence. Predation rate of artificial snakes, unlike that obtained in other studies, was lower in human-altered areas than preserved ones. Our findings may be due to a reduction in the abundance and/or richness of species of native predators in more disturbed areas.

The brine shrimp (Artemia parthenogenetica) as encapsulation organism for prophylactic chemotherapy of fish and prawn

1996 ◽  
Vol 14 (2) ◽  
pp. 183-188 ◽  
Author(s):  
Cao Ji-xiang ◽  
Bian Bo-zhong ◽  
Li Ming-ren
Keyword(s):  
Brine Shrimp ◽  
Artemia Parthenogenetica ◽  
Prophylactic Chemotherapy

Distributions of diploid and pentaploid brine shrimp Artemia parthenogenetica in an illuminated thermal gradient

1991 ◽  
Vol 69 (9) ◽  
pp. 2461-2465 ◽  
Author(s):  
Hugh Lefcort ◽  
Lei Zhang ◽  
Charles E. King
Keyword(s):  
Behavioral Response ◽  
Thermal Gradient ◽  
Brine Shrimp ◽  
Horizontal Gradients ◽  
Light Gradient ◽  
Artemia Parthenogenetica ◽  
Light Intensities

We explored the behavioral response to horizontal gradients of light and heat of sympatric diploid and pentaploid Artemia parthenogenetica. When exposed to a uniformly illuminated thermal gradient, pentaploids had a mean distribution that was oriented toward temperatures 2.9 °C higher than that of diploid animals. In a light gradient, diploids were distributed at higher light intensities than pentaploids. When the distributions in an evenly illuminated thermal gradient were compared with those occurring when thermal and light gradients ran in opposite directions, it was found that diploids tended to occur at lower temperatures, whereas pentaploid distributions were not significantly different for the two conditions. Our findings suggest that pentaploids are not as strongly attracted to light as diploids, in either the presence or the absence of a thermal gradient. We predict that in the field, warmer areas of a pond may be exploited by pentaploids during the day and by diploids during the night.

scholarly journals Ocean acidification alters predator behaviour and reduces predation rate

2017 ◽  
Vol 13 (2) ◽  
pp. 20160797 ◽  
Author(s):  
Sue-Ann Watson ◽  
Jennifer B. Fields ◽  
Philip L. Munday
Keyword(s):  
Ocean Acidification ◽  
Marine Invertebrates ◽  
Marine Invertebrate ◽  
Predation Rate ◽  
Ecosystem Structure ◽  
Cone Snail ◽  
Predator Prey ◽  
Food Web Interactions ◽  
Near Future ◽  
Increased Activity

Ocean acidification poses a range of threats to marine invertebrates; however, the emerging and likely widespread effects of rising carbon dioxide (CO 2 ) levels on marine invertebrate behaviour are still little understood. Here, we show that ocean acidification alters and impairs key ecological behaviours of the predatory cone snail Conus marmoreus . Projected near-future seawater CO 2 levels (975 µatm) increased activity in this coral reef molluscivore more than threefold (from less than 4 to more than 12 mm min −1 ) and decreased the time spent buried to less than one-third when compared with the present-day control conditions (390 µatm). Despite increasing activity, elevated CO 2 reduced predation rate during predator–prey interactions with control-treated humpbacked conch, Gibberulus gibberulus gibbosus ; 60% of control predators successfully captured and consumed their prey, compared with only 10% of elevated CO 2 predators. The alteration of key ecological behaviours of predatory invertebrates by near-future ocean acidification could have potentially far-reaching implications for predator–prey interactions and trophic dynamics in marine ecosystems. Combined evidence that the behaviours of both species in this predator–prey relationship are altered by elevated CO 2 suggests food web interactions and ecosystem structure will become increasingly difficult to predict as ocean acidification advances over coming decades.

Effect of different predation rate on predator-prey model with harvesting, disease and refuge

2015 ◽  
Author(s):  
K. Pusawidjayanti ◽  
A. Suryanto ◽  
R. B. E. Wibowo
Keyword(s):  
Predation Rate ◽  
Predator Prey ◽  
Predator Prey Model ◽  
Prey Model
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