Aggressive interactions between two invasive species: the round goby (Neogobius melanostomus) and the spinycheek crayfish (Orconectes limosus)

Personality‐dependent inter‐ and intraspecific foraging competition in the invasive round goby, Neogobius melanostomus

“…Analysis of prey consumption by treatment fish shows that competitive differences between bold and shy N. melanostomus are not because of differences in the number of prey items consumed by each personality type. Several previous studies of competition in N. melanostomus have shown that the competitive success of this species is often a result of high levels of aggressive and antagonistic behaviours towards competitors (e.g., Balshine et al, 2005;Bergstrom & Mensinger, 2009;Church et al, 2017;Dubs & Corkum, 1996;Janssen & Jude, 2001;Leino & Mensinger, 2017). Although boldness and aggression are often linked within individuals, with bolder individuals being more aggressive than shy individuals (Biro & Stamps, 2008;Sih et al, 2004), Groen et al (2012) detected no association between boldness and aggression at the T A B L E 1 Poisson GLM analyses of "focal fish consumption" and "treatment fish consumption," and negative-binomial GLM analysis of "total interactions," based on factors "focal species," "treatment fish personality," their interaction term and the covariates "focal fish length" and "treatment fish length".…”

Artificial neural networks approach in length-weight relation of crayfish (Astacus leptodactylus Eschscholtz, 1823) in Eğirdir Lake, Isparta, Turkey

“…Morphometric characteristics are greatly influenced by environmental factors such as nutrition, behavior, nutrition efficiency and availability and quality of food resources [6]. Environmental factors may impact crayfish growth by affecting foraging efficiency, feeding behavior, and the availability and [14,[33][34][35][36].…”

“…The characteristics measured in these species are carapace length, body length, total length, body width, and wet weight [5]. Metric measures between individual body parts are used to show the morphological changes between gender of crayfish species [6]. If one of the metric measurements is known and the length-weighted regression can be used to calculate the length from the weight, it may be appropriate to be able to convert it to the desired length measurement [7].…”

Modeling potential impacts of three benthic invasive species on the Lake Erie food web

“…For example, golden mussels may settle on Dreissena mussels and compete for space, which may further decrease the biomass of dreissenids. Also, round goby has demonstrated aggressive behavior towards ruffe and other benthic competitors (Balshine et al 2005;Church et al 2017;Jůza et al 2017), which might restrict ruffe's invasion and establishment. Secondly, positive effects by these three benthic invaders may have been overestimated for some fishes.…”

“…Predicting the potential impacts of an invasive species is challenging. Most studies either make predictions using information on the invasion history of the invasive species and its impacts on invaded environments (Howeth et al 2016;Keller and Drake 2009;Kulhanek et al 2011), or focus on the direct impacts of the invasive species on their prey or competitors (Church et al 2017;Dick et al 2014;Laverty et al 2017). These studies often ignore species interactions and indirect food web effects of the receiving environment, which may affect the population biomass that an invasive species can obtain and which is an important predictor of its ecological impacts (Goudswaard et al 2008;Harrington et al 2009;Lodge 1993;Parker et al 1999).…”