The strike of the dragonfly larvae

2021 ◽  
Vol 6 (50) ◽  
pp. eabf4718
Author(s):  
Hannah M. Wood
Keyword(s):  
Predatory Strike

The predatory strike of dragonfly larvae can inspire the design of fast robotic movement with enhanced control and precision.

Hit distance and the predatory strike of the praying mantis

1967 ◽  
Vol 56 (3) ◽  
pp. 237-257 ◽  
Author(s):  
H. Maldonado ◽  
L. Levin ◽  
J. C. Barros Pita
Keyword(s):  
Praying Mantis ◽  
Predatory Strike

scholarly journals Ground squirrel tail-flag displays alter both predatory strike and ambush site selection behaviours of rattlesnakes

2012 ◽  
Vol 279 (1743) ◽  
pp. 3827-3833 ◽  
Author(s):  
Matthew A. Barbour ◽  
Rulon W. Clark
Keyword(s):  
Empirical Evidence ◽  
Site Selection ◽  
Ground Squirrel ◽  
Ground Squirrels ◽  
Predatory Strike ◽  
Honest Signals ◽  
Northern Pacific ◽  
Ambush Foraging ◽  
California Ground Squirrels

Many species approach, inspect and signal towards their predators. These behaviours are often interpreted as predator-deterrent signals—honest signals that indicate to a predator that continued hunting is likely to be futile. However, many of these putative predator-deterrent signals are given when no predator is present, and it remains unclear if and why such signals deter predators. We examined the effects of one such signal, the tail-flag display of California ground squirrels, which is frequently given both during and outside direct encounters with northern Pacific rattlesnakes. We video-recorded and quantified the ambush foraging responses of rattlesnakes to tail-flagging displays from ground squirrels. We found that tail-flagging deterred snakes from striking squirrels, most likely by advertising squirrel vigilance (i.e. readiness to dodge a snake strike). We also found that tail-flagging by adult squirrels increased the likelihood that snakes would leave their ambush site, apparently by elevating the vigilance of nearby squirrels which reduces the profitability of the ambush site. Our results provide some of the first empirical evidence of the mechanisms by which a prey display, although frequently given in the absence of a predator, may still deter predators during encounters.

scholarly journals Functional morphology of the raptorial forelegs in Mantispa styriaca (Insecta: Neuroptera)

Zoomorphology ◽  
2021 ◽  
Author(s):  
Sebastian Büsse ◽  
Fabian Bäumler ◽  
Stanislav N. Gorb
Keyword(s):  
Morphological Description ◽  
Form And Function ◽  
Predatory Strike ◽  
Actuation System ◽  
Starting Point ◽  
Multifunctional Device ◽  
Biomechanical Investigation ◽  
And Function ◽  
Intrinsic Musculature ◽  
Behavioural Adaptations

AbstractThe insect leg is a multifunctional device, varying tremendously in form and function within Insecta: from a common walking leg, to burrowing, swimming or jumping devices, up to spinning apparatuses or tools for prey capturing. Raptorial forelegs, as predatory striking and grasping devices, represent a prominent example for convergent evolution within insects showing strong morphological and behavioural adaptations for a lifestyle as an ambush predator. However, apart from praying mantises (Mantodea)—the most prominent example of this lifestyle—the knowledge on morphology, anatomy, and the functionality of insect raptorial forelegs, in general, is scarce. Here, we show a detailed morphological description of raptorial forelegs ofMantispa styriaca(Neuroptera), including musculature and the material composition in their cuticle; further, we will discuss the mechanism of the predatory strike. We could confirm all 15 muscles previously described for mantis lacewings, regarding extrinsic and intrinsic musculature, expanding it for one important new muscle—M24c. Combining the information from all of our results, we were able to identify a possible catapult mechanism (latch-mediated spring actuation system) as a driving force of the predatory strike, never proposed for mantis lacewings before. Our results lead to a better understanding of the biomechanical aspects of the predatory strike in Mantispidae. This study further represents a starting point for a comprehensive biomechanical investigation of the convergently evolved raptorial forelegs in insects.

scholarly journals The temperature-dependent predatory strike of Odonata larvae

2020 ◽  
Author(s):  
Alexander Koehnsen ◽  
Hannah-Lena Troeger ◽  
Stanislav N Gorb ◽  
Sebastian Buesse
Keyword(s):  
Ambient Temperature ◽  
Ecological Perspective ◽  
Avoidance Reaction ◽  
Ecological Context ◽  
Temperature Dependent ◽  
Ambient Temperatures ◽  
Predatory Strike ◽  
Previous Assumption ◽  
Prey Items ◽  
Series Elastic

The larvae of Odonata are limnic predators capable of catching their prey using a highly modified mouthpart - the labium. Driven by a unique dual catapult mechanism, the apparatus can reach peak accelerations of up to 114.5m/s2. Yet little is known about the kinematics of the predatory strike in an ecological context. Here we show how different ambient temperatures affect the predatory strike and the avoidance reaction of prey items of Odonata larvae. We found that the extension velocity of the labial mask decreases significantly with the ambient temperature both in dragonflies and damselflies. However, temperature has lesser impact on the predatory strike itself than on directly muscle driven movements in both the predator and prey items. This contradicts the previous assumption that catapult mechanisms in insects are unaffected by temperature. Our results indicate that the prehensile labial mask is driven by a series-elastic catapult; a mechanism similar to the temperature dependent jump of frogs, where muscle and spring action are tightly linked. Our study provides novel insights into the predatory strike of Odonata larvae and offers a new ecological perspective on catapult mechanisms in arthropods in general.

scholarly journals Mutualistic cleaner fish maintains high escape performance despite privileged relationship with predators

2017 ◽  
Vol 284 (1853) ◽  
pp. 20162469 ◽  
Author(s):  
Simon Gingins ◽  
Dominique G. Roche ◽  
Redouan Bshary
Keyword(s):  
Reef Fishes ◽  
Escape Performance ◽  
Cleaner Fish ◽  
Labroides Dimidiatus ◽  
Selective Pressures ◽  
Predatory Strike ◽  
Close Proximity ◽  
Mutualistic Relationship ◽  
Fast Start ◽  
The Cost

Predatory reef fishes regularly visit mutualistic cleaner fish ( Labroides dimidiatus ) to get their ectoparasites removed but show no interest in eating them. The concept of compensated trait loss posits that characters can be lost if a mutualistic relationship reduces the need for a given trait. Thus, selective pressures on escape performance might have relaxed in L. dimidiatus due to its privileged relationship with predators. However, the cost of failing to escape a predatory strike is extreme even if predation events on cleaners are exceptionally rare. Additionally, cleaners must escape from non-predatory clients that regularly punish them for eating mucus instead of parasites. Therefore, strong escape capabilities might instead be maintained in cleaner fish because they must be able to flee when in close proximity to predators or dissatisfied clients. We compared the fast-start escape performance of L. dimidiatus with that of five closely related wrasse species and found that the mutualistic relationship that cleaners entertain with predators has not led to reduced escape performance. Instead, conflicts in cleaning interactions appear to have maintained selective pressures on this trait, suggesting that compensated trait loss might only evolve in cases of high interdependence between mutualistic partners that are not tempted to cheat.

The Predatory Strike of the Rattlesnake: When Things Go Amiss

Copeia ◽  
1986 ◽  
Vol 1986 (3) ◽  
pp. 816 ◽  
Author(s):  
Kenneth V. Kardong
Keyword(s):  
Predatory Strike

scholarly journals The Effects of Temperature on the Kinematics of Rattlesnake Predatory Strikes in Both Captive and Field Environments

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
M D Whitford ◽  
G A Freymiller ◽  
T E Higham ◽  
R W Clark
Keyword(s):  
Body Temperature ◽  
New World ◽  
Environmental Temperature ◽  
Maximum Velocity ◽  
Locomotor Performance ◽  
Body Temperatures ◽  
Predator Prey ◽  
Predatory Strike ◽  
Effects Of Temperature ◽  
The Difference

Abstract The outcomes of predator–prey interactions between endotherms and ectotherms can be heavily influenced by environmental temperature, owing to the difference in how body temperature affects locomotor performance. However, as elastic energy storage mechanisms can allow ectotherms to maintain high levels of performance at cooler body temperatures, detailed analyses of kinematics are necessary to fully understand how changes in temperature might alter endotherm–ectotherm predator–prey interactions. Viperid snakes are widely distributed ectothermic mesopredators that interact with endotherms both as predator and prey. Although there are numerous studies on the kinematics of viper strikes, surprisingly few have analyzed how this rapid movement is affected by temperature. Here we studied the effects of temperature on the predatory strike performance of rattlesnakes (Crotalus spp.), abundant new world vipers, using both field and captive experimental contexts. We found that the effects of temperature on predatory strike performance are limited, with warmer snakes achieving slightly higher maximum strike acceleration, but similar maximum velocity. Our results suggest that, unlike defensive strikes to predators, rattlesnakes may not attempt to maximize strike speed when attacking prey, and thus the outcomes of predatory strikes may not be heavily influenced by changes in temperature.

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