We arcsine-trans-formed all sex ratio and ovigerous female data prior to the 2-way ANOVA to statistically analyze non-normal proportion data. Worldwide, the introduction and spread of non-native species cause changes in diversity and species interactions in recipient ecosystems (Pyek and Richardson 2010; Lowry et al. 2012). 2). Master-Thesis University of Groningen, The Netherlands, Bouwmeester MM, Waser AM, van der Meer J, Thieltges DW (2020) Prey size selection in invasive (Hemigrapsus sanguineus and H. takanoi) compared with native (Carcinus maenas) marine crabs. Highest barnacle survival rate was detected in the absence of crabs with a mean survival of 99.38%0.62% cage1, and survival rate was significantly lower in the treatments with enclosed native C. maenas (77.40%3.89% cage1, Wilcoxon signed rank test: p=0.004) and non-native H. takanoi (83.14%3.13% cage1, Wilcoxon signed rank test: p=0.004) in the cages, respectively. Histograms of Asian shore crab sizes at survey sites in New England. Additionally, a large part of the adult C. maenas population lives in the subtidal zone and provides a high number of planktonic larvae, which settle in the above-mentioned habitats. 6; Suppl Table 2). https://doi.org/10.3354/meps12245, Jungblut S, Beermann J, Boos K, Saborowski R, Hagen W (2017) Population development of the invasive crab Hemigrapsus sanguineus (De Haan, 1853) and its potential native competitor Carcinus maenas (Linnaeus, 1758) at Helgoland (North Sea) between 2009 and 2014. Does physiological tolerance to acute hypoxia and salinity change explain ecological niche in two intertidal crab species? Comparing the sexes, the consumption of amphipods G. locusta by female and male H. takanoi was significantly different (MannWhitney U-test: p<0.001). They aren't exactly picky eaters and will feast on anything and everything they come across, including seaweed, mussels, barnacles and even smaller . Mia Steinberg, Charles Epifanio, and Shawn McCafferty for sharing their Hemigrapsus sanguineus COI sequences, and Alexandra Ulin for assistance with PCR. Monterey Bay Aquarium Research Institute, Moss Landing, CA 95039, USA, Invasive species, Crab, Population genetics, Range expansion, Asian shore crab, Green crab, Mitochondrial DNA, Gulf of Maine, {"type":"entrez-nucleotide","attrs":{"text":"HQ702865","term_id":"338776868"}}, {"type":"entrez-nucleotide","attrs":{"text":"KX579065","term_id":"1197991165"}}, {"type":"entrez-nucleotide","attrs":{"text":"KX579066","term_id":"1197991167"}}, {"type":"entrez-nucleotide","attrs":{"text":"EU169911.1","term_id":"158634288"}}, {"type":"entrez-nucleotide","attrs":{"text":"EU169902.1","term_id":"158634270"}}, {"type":"entrez-nucleotide","attrs":{"text":"EU169905.1","term_id":"158634276"}}, {"type":"entrez-nucleotide","attrs":{"text":"EU169923.1","term_id":"158634312"}}, {"type":"entrez-nucleotide","attrs":{"text":"EU169910.1","term_id":"158634286"}}, Albins MA. At sites in New Hampshire and southern Maine where H. sanguineus was abundant, C. maenas was found at less than half the densities at which it was found in northern Maine where H. sanguineus was rare. Crab carapace width of both sexes was 1520mm. 6; Suppl Table 2). By contrast, the introduced H. takanoi inhabits intertidal oyster reefs all year round with continuous recruitment that peaks in September (Geburzi et al. Invasive green crabs: If you can't beat them, eat them. Eight-year record of. The strategy of Hemigrapsus takanoi for preying on mussels is different in male (a) and female (b) Asian brush-clawed shore crabs. (2009). Regardless of the factors preventing maximum rates of population expansion, it is clear that H. sanguineus populations have increased substantially in New Hampshire and south-central Maine over the last decade and could extend this upward trajectory, given that H. sanguineus can reach densities of hundreds per square meter in cobble habitats. In addition to the east coast of the USA, H. sanguineus spread to France and the Netherlands by 1999, the Black Sea by 2008, and the UK by 2014, so this crab species is a burgeoning problem in several parts of the world (Breton et al. Mean densities m2 (SE) of juvenile blue mussels Mytilus edulis in a field cage experiment at an intertidal mixed oyster reef after an experimental period of 14weeks in spring/summer 2019. Amer Zool 37:621632. The .gov means its official. Single H. takanoi individuals were separately offered 30 blue mussels (shell length 811mm) and 10 G. locusta (body length 514mm) within one aquarium, respectively. As in Stephenson et al. Site temperatures, locations, and sampling dates are shown in Table 1. The experiment included five treatments with six replicates each: (1) no crabs in the cages, (2) cages with two male C. maenas with a carapace width of 1050mm, and (3) cages with two female and four male H. takanoi with a carapace width of 1040mm. Sites are displayed in order from south to north. This disambiguation page lists articles associated with the title Asian shore crab. . was 4525 individuals m2, while at site B (Puan Klent), amphipod densities were higher with 26138 individuals m2 (Fig. 6; Table 3; Suppl Table 2). Two newly identified haplotypes, named haplotype 29 and haplotype 30, respectively (GenBank {"type":"entrez-nucleotide","attrs":{"text":"KX579065","term_id":"1197991165"}}KX579065, {"type":"entrez-nucleotide","attrs":{"text":"KX579066","term_id":"1197991167"}}KX579066), were also found. To offer a defined number of barnacles and juvenile oysters in the cages, we collected oysters with a maximal shell length of 1215cm, which were overgrown with recently settled A. modestus (size 13mm in diameter) and juvenile M. gigas (shell length 25mm). Lohrer A, Whitlatch R. Relative impacts of two exotic brachyuran species on blue mussel populations in Long Island Sound. At site A in 2020, densities of H. takanoi were finally many times higher than of. Six of these haplotypes were of Asian origin, while two are newly described. The Asian shore crab also occurs on . 2015). Both species show an overlapping food spectrum but with partly different prey preferences. However, despite decreasing densities in oyster reefs, it seems not likely that the occurrence of native shore crabs is endangered by the spread of H. takanoi on a Wadden-Sea wide scale. 2002; Micu et al. The area is located in the cold temperate region with a mean annual water temperature of about 9C, a summer average of 15C, and a winter average of 4C. Densities of Asian shore crabs (H. sanguineus) at all surveyed sites. Mussels' Fast Evolution Turns Scientists' Heads : NPR 2023 Apr 6;11:e15161. The density of H. takanoi, by contrast, increased from a mean density of 185 individuals m2 in 2011 to a maximum of 24849 individuals m2 in 2018 and remained at about 200 individuals m2 until 2020. Cornelius, A., Wagner, K. & Buschbaum, C. Prey preferences, consumption rates and predation effects of Asian shore crabs (Hemigrapsus takanoi) in comparison to native shore crabs (Carcinus maenas) in northwestern Europe. Therefore, the aim of this study was to investigate prey preferences of female and male Asian brush-clawed shore crabs H. takanoi in comparison to the European shore crab C. maenas in the European Wadden Sea (coastal area of the southeastern North Sea). Mussels were fed with algae suspension (Instant Algae Iso 1800TM, Shellfish Diet 1800 TM), crabs were fed with mussel, and oyster flesh and amphipods were fed with fucoid macroalgae. In larger populations that were closer to the original site of invasion, it was expected that genetic variation would be greater as compared to more northern sites where populations were expected to be newer and smaller. Six random samples were taken from each oyster reef by using a 2525cm steel frame (625 cm2). At the beginning of the experiment on 6 September 2018, each cage contained a single oyster with either 4080 attached A. modestus or 5075 attached juvenile M. gigas. It has been documented that green crab devour juvenile king crab as well as juvenile salmon. This was supported by an absence of any significant difference in density, size, or sex ratio of H. sanguineus between different tidal levels at the sites included in this survey, as well as by Lohrer et al. In marine environments, introductions of lionfish in the northwest Atlantic (Albins 2013) and the ctenophore Mnemiopsis leidyi (Shiganova 1998) in the Black Sea have led to drops in the abundance and diversity of native fish species. Ruiz G, Carlton J. Pac Sci 18:333, Kochmann J, Buschbaum C, Volkenborn N, Reise K (2008) Shift from native mussels to alien oysters: Differential effects of ecosystem engineers. Open Access funding enabled and organized by Projekt DEAL. Estuar Coast Shelf Sci 131:4151. For all experiments, we used a control treatment, i.e., aquaria with prey organisms but without crabs. With this experiment, we aimed to imitate natural population structures (density and sex ratio) of both crab species in the cages at the time of the experiment in spring 2017. Although this pattern was also observed at other sites in the northern Wadden Sea (K. Reise, personal communication), this result has to be considered with caution. This study combined a series of small case experiments to provide the most comprehensive overall picture of potential predation effects of the introduced Asian brush-clawed shore crab H. takanoi in comparison to the native C. maenas that may explain the current invasion status of the Asian brush-clawed shore crab. 2011: GenBank {"type":"entrez-nucleotide","attrs":{"text":"HQ702865","term_id":"338776868"}}HQ702865, HQ70286577, HQ70286578, HQ70286583, HQ70286584, and HQ70286590). (2009) and were spaced approximately 30-km apart (Table 1; Fig. To compare consumption rates of introduced H. takanoi on amphipods (Gammarus locusta Linnaeus, 1758) and juvenile blue mussels (M. edulis), we conducted a no-choice experiment. The increased predation pressure may not only affect oyster reef associated organisms but also the habitat-forming species itself. Funding provided by a Bates College startup fund 3457-2025 (to JPL), and a Bates College research reserve fund 38299155 (to LMW). Male crabs consumed about 10 times more blue mussels (14.830.96 blue mussels crab1 d1) than female conspecifics (1.430.22 blue mussels crab1 d1). PATTERNS OF LARVAL RELEASE BY THE ASIAN SHORE CRAB HEMIGRAPSUS - BioOne Site labels correspond to site descriptions and crab densities in Tables 1 and and22, Mean density is the density averaged across all three tidal levels (N = 12), and peak density is the highest density found at that site for that species. A strong impact of the invader on prey populations is supported by low amphipod occurrence at sites where H. takanoi density is high in the study area. Female crabs consumed about twice as many amphipods (8.000.37 amphipods crab1 d1) than male individuals (4.060.47 amphipods crab1 d1). The surveys in this study were designed to estimate density and repeat a previous survey (Stephenson et al. 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Crab size-frequency distributions were fairly similar for sites in New Hampshire and southern Maine (Fig. Comparison of consumption rate of mussels and amphipods by female C. maenas as well as male C. maenas revealed no significant difference between the sexes (MannWhitney U-test: p>0.136, for both comparisons). Description: Adults are small, about an inch and a half in shell width. In: Galil B, Clark P, Carlton J (eds) The Wrong Place - Alien Marine Crustaceans: Distribution, Biology and Impacts.
