Tail loss, urotomy, in reptiles and amphibians has been the emphasis of many ecological and evolutionary studies, especially in lizards and salamanders; however, less is known about this phenomenon in snakes. In addition, while hypotheses for variation in tail loss across natural populations exist, none have been strongly supported. We conducted much needed research on tail loss in snakes and a...

In the context of global change, emerging risks associated with parasites, invasive species and infectious diseases are an important issue especially for developing countries whose economies are resource-based. Our objective is to provide a mathematical framework to study the response of a harvested predator-prey system to a disease in the predator and proportional harvesting of predator. We co...

Predator is a tool for automated formal verification of sequential C programs operating with pointers and linked lists. The core algorithms of Predator were originally inspired by works on separation logic with higher-order list predicates, but they are now purely graph-based and significantly extended to support various forms of low-level memory manipulation used in system-level code. This pap...

Predator-prey models with Hassell-Varley type functional response are appropriate for interactions where predators form groups and have applications in biological control. Here we present a systematic global qualitative analysis to a general predator-prey model with Hassell-Varley type functional response. We show that the predator free equilibrium is a global attractor only when the predator d...

The current paper deals with the mathematical models of predator-prey system where a transmissible disease spreads among the predator species only. Four mathematical models are proposed and analysed with several popular predator functional responses in order to show the influence of functional response on eco-epidemic models. The existence, boundedness, uniqueness of solutions of all the models...

As predator-prey interactions are inherently size-dependent, predator and prey body sizes are key to understanding their feeding relationships. To describe predator-prey size relationships (PPSRs) when predators can consume prey larger than themselves, we conducted field observations targeting three aquatic hemipteran bugs, and assessed their body masses and those of their prey for each hunting...

We consider a particle predator-swarm model introduced in [1]. In the continuum limit of many prey particles, we develop a numerical method which tracks the boundary of the swarm. We use this method to explore the variety and complexity of swarm shapes. We also consider a special limiting case where the predator is moving inside an infinite sea of prey. Two subcases are studied: one where the p...

This paper deals with the dynamics of a tritrophic food chain model composed of a prey, predator and a super predator. A discrete time delay is introduced to the functional response term involved with the growth equation of predator and super predator to allow for a reaction time. The main content of this paper is divided into two parts. In the first part we consider the model with density depe...

Interactions between individuals of different cetacean species are often observed in the wild. Killer whales (Orcinus orca) can be potential predators of many other cetaceans, and the interception of their vocalizations by unintended cetacean receivers may trigger anti-predator behavior that could mediate predator-prey interactions. We explored the anti-predator behaviour of five typically-soli...