Effects of sampling techniques on population assessment of invasive round goby <i>Neogobius</i><i>melanostomus</i>

Brandner, Joerg; Pander, Joachim; Mueller, Melanie; Cerwenka, Alexander F.; Geist, Juergen

doi:10.1111/jfb.12137

Cited by 46 publications

(34 citation statements)

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“…In line with our findings, Gutowsky and Fox (2011) [8] also caught the largest individuals of each sex at initially invaded areas, but found significantly larger males than females at the edges of upstream expansion areas. This size-specific difference may result from using angling as a sampling method by these authors since angling was found to be selective for larger males [65]. In contrast to our findings, Brownscombe and Fox (2012) [16] caught smaller round gobies at recently invaded areas compared to longer established sites, indicating that local habitat conditions and community structure can strongly influence trait selection.…”

Section: Discussioncontrasting

confidence: 93%

“…This observation is in line with this study, as four out of five first recorded invaders in autumn 2010 (right shoreline) and seven out of thirteen pioneers in autumn 2011 (right shoreline) were female at the IF2010, suggesting that a higher proportion of females may contribute to range expansion in round goby. Despite the sex-selectivity of the different sampling techniques used, which is higher in hook-and-line based sampling than in electrofishing as applied in this study (see Brandner et al, 2013 [65]), migrating adult females appear to be a main driver of range expansion. Among various reasons, inbreeding depression avoidance, asymmetry in the costs of dispersal and mating system characteristics [75] can cause sex-biased dispersal in invasions.…”

Section: Discussionmentioning

confidence: 77%

“…Generally, round goby riverine colonization appears to be driven by ‘stratified dispersal’, a strategy combined of contiguous diffusion over short distances by most individuals and long-distance colonization (jump events) by migrant individuals [26], [30]. Given a low sampling bias [65] and a minimum population doubling time (estimates based on empirical models) of 1.4 to 4.4 years [81], the danubian invasion of N. melanostomus seems to be mainly driven by a high upstream directed propagule pressure from densely populated established areas with strong, large sized individuals, rather than by an increased reproductive success at the invasion front. The anti-cyclical trend between round goby density increase and population decrease of the two most abundant autochthonous fish species (barbel and chub) and EPT observed in this study (Tables 2 and 4), suggests alterations of the food web.…”

Section: Discussionmentioning

confidence: 99%

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Bigger Is Better: Characteristics of Round Gobies Forming an Invasion Front in the Danube River

et al. 2013

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Few studies have systematically investigated differences in performance, morphology and parasitic load of invaders at different stages of an invasion. This study analyzed phenotype-environment correlations in a fish invasion from initial absence until establishment in the headwater reach of the second largest European river, the Danube. Here, the round goby (Neogobius melanostomus) formed 73% of the fish abundance and 58% of the fish biomass in rip-rap bank habitats after establishment. The time from invasion until establishment was only about two years, indicating rapid expansion. Founder populations from the invasion front were different from longer established round goby populations in demography, morphology, feeding behaviour, sex ratio and parasitic load, indicating that plasticity in these traits determines invasion success. Competitive ability was mostly dependent on growth/size-related traits rather than on fecundity. As revealed by stable isotope analyses, specimens at the invasion front had a higher trophic position in the food web and seem to benefit from lower food competition. Somatic performance seems to be more important than investment in reproduction during the early stages of the invasion process and upstream-directed range expansion is not caused by out-migrating weak or juvenile individuals that were forced to leave high density areas due to high competition. This mechanism might be true for downstream introductions via drift. Greater abundance and densities of acanthocephalan endoparasites were observed at the invasion front, which contradicts the expectation that invasion success is determined by lower parasitic pressure in newly invaded areas. Overall, the pronounced changes in fish and invertebrate communities with a dominance of alien species suggest invasional meltdown and a shift of the upper Danube River towards a novel ecosystem with species that have greater resistance to goby predation. This seems to contribute to overcoming biological resistance and improve rapidity of dispersal.

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Section: Discussioncontrasting

confidence: 93%

Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

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Bigger Is Better: Characteristics of Round Gobies Forming an Invasion Front in the Danube River

et al. 2013

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“…The number of available nests and the sex ratio are both important factors affecting reproduction because of round goby's nest guarding strategy (Meunier et al., ). A challenging issue is that the observed sex ratio can be biased by the catch technique (Brandner, Pander, Mueller, Cerwenka, & Geist, ; Thompson & Simon, ) and by invasion stage. Because of a lack of own field data and unclear literature values (N'Guyen et al., ), in our model we assumed equal proportions of removed males and females (Figure in Appendix ).…”

Section: Discussionmentioning

confidence: 99%

A dynamical model for invasive round goby populations reveals efficient and effective management options

N’Guyen

Hirsch

Bozzuto³

et al. 2017

Journal of Applied Ecology

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Abstract1. When prevention of invasive species' introductions fails, society faces the challenge to manage invasive species in an effective and efficient way. The success of this depends on biological aspects and on cooperation between decision makers and scientists.Using the case of the round goby Neogobius melanostomus, one of Europe's "worst invasive species", we propose an approach guiding scientists to co-produce effective and efficient population control measures in collaboration with decision makers.2. We surveyed the effectiveness, urgency and simplicity perceived by decision makers as well as the support of two population control options: removal of eggs and/ or adults. Using a field study and a dynamical population model, we investigated the effectiveness and efficiency for both options in different population contexts.3. Decision makers initially seemed to lack a clear preference for either control option.After being presented with preliminary field and modelling results, decision makers mostly approved measures being developed to implement the two control options.4. Starting population control early after detecting the species requires in total fewer years for eradication than controlling an established population: to reach an eradication success rate of 95%, 13 years for early start vs. 18 years for late start are needed when removing eggs and adults; when removing adults only, 20 vs. 29 years are needed. Removing eggs and adults combined results in a yearly effort of 5.01 h/m 2 , while removing adults only results in a yearly effort of 1.76 h/m 2 . Thus, removing adults only proves to be the most efficient option to eradicate the population. Nonetheless, considerable effort is needed: when removing less than 57% of the adult population, eradication is not feasible, even assuming low survival and fecundity rates for the population. Furthermore, inflow of new propagules renders eradication efforts ineffective. Synthesis and applications.Scientists who aim to support decision makers in finding an optimal control strategy for invasive species need to be able to provide scientific knowledge on effectiveness and efficiency of different options. For round goby and most non-native species, eradication is only feasible if started early in recently arrived populations and if inflow of new propagules can be prevented.

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“…The variety of collection methods used to sample N . melanostomus may introduce gear bias as an analysis covariate (Brandner et al , ). Kick seining has been demonstrated to be useful in wadeable shoreline habitats (Jude et al , ), while bottom trawling has been effective for non‐wadeable areas (Clapp et al , ).…”

Section: Discussionmentioning

confidence: 99%

Age and growth of round goby Neogobius melanostomus associated with depth and habitat in the western basin of Lake Erie

Thompson

Simon

2015

Journal of Fish Biology

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Round goby Neogobius melanostomus were examined from the Bass Islands area in the western basin of Lake Erie, U.S.A., to determine age and growth correlations. A total of 188 specimens were collected and examined during summer 2011 with 90 aged using scale analysis. Fish were grouped by sex, depth of habitat and habitat type (anthropogenically modified shallows, natural shallows and open lake deep water). Fish ranged from 17 to 117 mm total length (L ) and 0+ to 3+ years. Males dominated the population (1·94:1) and backcalculated age showed that both sexes grew exponentially, with male growth rate increasing faster than female. Males were significantly larger than females in L and mass (both P < 0·001). The relative mass index (W ) was low for the sampled population (mean ± s.d. = 32·00 ± 26·87 g), implying that the health of the Bass Island area population is very poor when compared with the species throughout its range. This could be due to a lack of food resources related to population size or that the fish is not optimally utilizing the available food resources. In contradiction to these findings, regression slope coefficient (b), calculated using Fulton's condition factor (K) (mean ± s.d. =1·50 ± 0·20), was very low for each habitat, implying a healthy population throughout. This seemingly opposite effect may be due to more individuals per unit area in shallow waters, which would cause increased competition for resources. Poor condition may indicate that the Lake Erie population has reached saturation or may reflect indirect fitness costs associated with increasing anoxic or hypoxic hypolimnion conditions.

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Effects of sampling techniques on population assessment of invasive round goby Neogobiusmelanostomus

Cited by 46 publications

References 45 publications

Bigger Is Better: Characteristics of Round Gobies Forming an Invasion Front in the Danube River

Bigger Is Better: Characteristics of Round Gobies Forming an Invasion Front in the Danube River

A dynamical model for invasive round goby populations reveals efficient and effective management options

Age and growth of round goby Neogobius melanostomus associated with depth and habitat in the western basin of Lake Erie

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