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11 results for “Invasive bivalves”
Fig. 2 in The Invasive Caribbean Bivalve Mytilopsis Sallei (Dreissenidae) Introduced To Singapore And Johor Bahru, Malaysia
Fig. 2. Percentage frequency histograms of live (filled bars) and dead (white bars) Mytilopsis size classes at ten localities in Singapore and Johor Bahru and arranged in order of increasing salinity. Size was measured as either shell length (living individuals) or right valves only (dead individuals). The largest individual recorded was 29 mm long. See Table 1 for sample sizes.
Fig. 1 in The Invasive Caribbean Bivalve Mytilopsis Sallei (Dreissenidae) Introduced To Singapore And Johor Bahru, Malaysia
Fig. 1. Occurrence of Mytilopsis sallei in Singapore and Johor Bahru. Open and closed dots represent localities where Mytilopsis was either absent or present, respectively. Location numbers correspond to those provided in Table 1, which are arranged in order of increasing salinity. Open and closed triangles denote locations as reported upon earlier (Sachidhanandam & Chou, 1996) and where Mytilopsis was also either absent or present, respectively. Two other localities where Mytilopsis occurs are represented by a closed square (Punggol Park; see Chan, 1997) and an asterisk (Geylang Canal; pers. obs.). Abbreviations: a–West Johor Straits; b–Sungei Buloh; c–Pulau Tekong; d–Kallang Basin; e–Singapore River; f–Pulau Semakau.
Data from: Physiological effects of interacting native and invasive bivalves under thermal stress
<p>Across many ecosystems in North America and Europe, native freshwater bivalves (Order Unionida) are threatened by fouling and competition for food by the invasive zebra mussel <em>Dreissena polymorpha</em>. In light of climate change, knowledge on the influence of water temperature on these competitive effects is important, yet poorly understood. This study examines the physiological impact of the interaction between <em>D. polymorpha</em> and the native European unionid <em>Anodonta cygnea</em> over a 28-day period in response to water temperatures of 12, 19, and 25 °C by comparing their glycogen, glucose, lipid, and protein concentrations. The laboratory experiment comprised three treatments: (1) fouling of <em>A. cygnea</em> by <em>D. polymorpha</em>, (2) both species present but not fouling; and (3) a control in which <em>A. cygnea</em> and <em>D.</em> <em>polymorpha</em> were placed separately. Increased water temperatures caused physiological stress in <em>D. polymorpha</em> as evident from reduced glycogen, glucose, lipid, and protein concentrations. <em>Dreissena polymorpha</em> benefited from fouling of unionids, as individuals that fouled <em>A. cygnea</em> tended to have increased glycogen, glucose, lipid and protein concentrations. Competitive effects of <em>D. polymorpha</em> over the unionid bivalve species, however, were not intensified by elevated temperatures. Glochidia release, lower infestation intensity, and physiological stress of <em>Dreissena </em>at higher temperatures were likely confounding factors. The results of this study suggest that understanding the physiological consequences of species interactions at changing temperatures can be an important tool to assess future climate change impacts on freshwater bivalves and aquatic community structures.</p>
Data from: Physiological effects of interacting native and invasive bivalves under thermal stress
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Data from: Potential effects of an invasive bivalve, Nuttallia obscurata, on select sediment attributes within the intertidal region of coastal British Columbia
On the west coast of British Columbia, Canada, the varnish clam, Nuttallia obscurata, is a rapidly spreading invasive species that can reach high densities (i.e. 800 individuals m− 2). A field survey (Tier I) and an in situ mesocosm density manipulation experiment (Tier II) were applied to determine the potential effects of this invasive bivalve on select sediment attributes within the intertidal zone. In situ experiments involved seeding 1 m2 mesocosms with varnish clams at four densities; 0 (control), 200 (low), 500 (mid) and 800 (high). Sediment samples were taken 7 times over a three week period and analyzed for organic matter, ammonium and grain size (gravel, coarse silt, fine silt and silt) at three different depths, 0–3 cm (surface), 3–6 cm (intermediate) and 6–9 cm (bottom). Field surveys demonstrated that at natural densities bivalve distribution was best explained by sediment grain size. Contrary to expectations, the in situ manipulations indicated that at high densities varnish clams did not significantly increase sediment organic matter concentrations. Their ability to deposit feed and re-ingest biodeposits may have prevented accumulations. High densities of varnish clams did however result in significantly higher concentrations of sediment ammonium and percent silt, but mostly within the lower sections of the sediment core. Reworking of the surficial sediments due to intense storm activity likely obscured any differences in determined sediment attributes among the 4 treatments. Nitrogen is a limiting nutrient with ammonium preferentially used by phytoplankton and microphytobenthos. These primary producers form the basis of all marine food webs thus increases in amounts of ammonium to shallow coastal seas as a result of high densities of an invasive bivalve within intertidal zones could result in an increased risk of eutrophication within these sensitive regions.
FIGURES 1-8 in Anatomical Study On Myoforceps Aristatus, An Invasive Boring Bivalve In S.E. Brazilian Coast (Mytilidae)
FIGURES 1-8. Myoforceps aristatus shells: 1-4) MZSP 48274 #1 (from Ubatuba, SP), 1) dorsal view; 2) left view; 3) right valve, inner view; 4) left valve, inner view; total length = 14.8 mm; 5-8) MZSP 48275 #1 (from Arraial do Cabo, RJ); 5) right view; 6) left view; 7) ventral view; 8) posterior view, showing characteristic crossed posterior projections; total length = 11.1 mm; 9-10) FMNH 311641 (from Florida), ventral and right views, specimen with contrary crossed posterior projections, total length = 24.1 mm.
FIGURES 16-18 in Anatomical Study On Myoforceps Aristatus, An Invasive Boring Bivalve In S.E. Brazilian Coast (Mytilidae)
FIGURES 16-18. Myoforceps aristatus anatomy: 16) whole right view, semi-diagrammatic representation of digestive tract and topology of main muscles, mucous gland (mg) and pericardium; 17) stomach right view, longitudinal section along gastric right wall; 18) ventral region of posterior adductor muscle (pa), with most integument and right gill removed, and topology of some adjacent structures shown. Scales = 1 mm.
Data from: Potential effects of an invasive bivalve, Nuttallia obscurata, on select sediment attributes within the intertidal region of coastal British Columbia
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Data from: Climate change and body size shift in Mediterranean bivalve assemblages: unexpected role of biological invasions
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Biometric conversion factors as a unifying platform for comparative assessment of invasive freshwater bivalves
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FIGURES 11-15 in Anatomical Study On Myoforceps Aristatus, An Invasive Boring Bivalve In S.E. Brazilian Coast (Mytilidae)
FIGURES 11-15. Myoforceps aristatus anatomy: 11) whole right view, right valve and mantle lobe removed (except for a short portion related to the siphons); 12) transverse section in middle region of gill, with some adjacent structures also shown; 13) posterior region, right view, with special emphasis on siphonal structures, with excurrent siphon sectioned longitudinally and most right structures removed, pallial flap covering siphons removed; 14) right palp, ventral view, both hemipalps deflected to show inner surfaces; 15) whole right view, with most right structures removed, and special emphasis on visceral structures and main muscles seen as in situ. Scales = 1 mm.
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