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1,088 results for “Bivalves”
Nothoscordum bivalve (Liliaceae) - stem - showing leaf bases
Image of Nothoscordum bivalve (Liliaceae) - stem - showing leaf bases
Nothoscordum bivalve (Liliaceae) - inflorescence - frontal view of flower
Image of Nothoscordum bivalve (Liliaceae) - inflorescence - frontal view of flower
Nothoscordum bivalve (Liliaceae) - whole plant - in flower - general view
Image of Nothoscordum bivalve (Liliaceae) - whole plant - in flower - general view
Nothoscordum bivalve (Liliaceae) - inflorescence - lateral view of flower
Image of Nothoscordum bivalve (Liliaceae) - inflorescence - lateral view of flower
Supporting for "Bivalve Resilience to Ocean Acidification: Active H+ Efflux as a Mechanism for Shell Growth Maintenance"
<p><span>Summary: </span></p> <p><span>This dataset encompasses a comprehensive collection of responses from the Manila clam <em>Ruditapes philippinarum</em> to ocean acidification. Key metrics included in this dataset are oxygen consumption rate, Ammonia-N excretion rate, intracellular pH, H⁺ flux, expression and activity of acid-base regulatory genes, and individual growth measurements.</span></p> <p><span> </span><span>The data was systematically compiled from both field mesocosm and laboratory experiments aimed at elucidating the physiological responses and underlying mechanisms by which bivalves adapt to the stressors associated with ocean acidification.</span></p> <p><span> </span><span>Data generation occurred primarily between 2020 and 2023. This dataset serves as a valuable resource for enhancing our mechanistic understanding of the responses and adaptive potential of marine bivalves in the context of escalating ocean acidification.</span></p>
Bivalve body size distribution through the Late Triassic mass extinction event
<p><span>The synergic relationship between physiology, ecology and evolutionary process makes the body size distribution (BSD) an essential component of the community ecology. Body size is highly susceptible to environmental change, and extreme upheavals, such as during a mass extinction event, could exert drastic changes on a taxon's BSD. It has been hypothesized that the Late Triassic mass extinction event (LTE) was triggered by intense global warming, linked to massive volcanic activity associated with the Central Atlantic Magmatic Province. We test the effects of the LTE on the BSD of fossil bivalve assemblages from three study sites spanning the Triassic/Jurassic boundary in the UK.</span> <span>Our results show that the effects of the LTE were rapid and synchronous across sites, and the BSDs of the bivalves record drastic changes associated with species turnover. No phylogenetic signal of size selectivity was recorded, although semi-infaunal species were apparently most susceptible to change. Each size class had the same likelihood of extinction during the LTE, which resulted in a platykurtic BSD with negative skew. The immediate post-extinction assemblage exhibits a leptokurtic BSD although with negatively skewed, where surviving species and newly appearing small-sized colonizers exhibit body sizes near the modal size. Recovery was relatively rapid (~100kyr), and larger bivalves began to appear during the Pre-Planorbis Zone, despite recurrent dysoxic/anoxic conditions. This study demonstrates how a mass extinction acts across the size spectrum in bivalves and shows how BSDs emerge from evolutionary and ecological processes.</span></p>
FIGURE 7 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 7. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, left fifth pereiopod, lateral view; B, idem, distal part propodus and dactylus, medial view. Scale bar: A = 0.5mm; B = 0.125mm.
FIGURE 3 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 3. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, left antennula, dorsal view; B, idem, ventral view; C, left antenna, ventral view; D, left mandible; E, left maxillula (lower lacinia missing); F, left maxilla (proximal part of scaphognathite missing); G, left first maxilliped. Scale bar: = 0.5mm.
FIGURE 6 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 6. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, left third pereiopod, lateral view; B, idem, distal part propodus and dactylus. Scale bar: A = 0.5mm; B = 0.125mm.
FIGURE 8 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 8. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, left first pleopod; B, left second pleopod; C, idem, appendix masculina and appendix interna; D, right exopod of uropod, distolateral part. Scale bars: A, B = 0.5mm; C, D = 0.125mm.
FIGURE 4 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 4. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, left second maxilliped; B, left third maxilliped; C, left first pereiopod. Scale bar: = 0.5mm.
FIGURE 1 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 1. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341, habitus, lateral view (second pereiopods detached, not drawn). Scale bar: = 2mm.
FIGURE 5 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 5. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, right major second pereiopod, dorsomedial view; B, left minor second pereiopod, dorsomedial view; C, fingers of right major second chela, medial view. Scale bar: A, B = 1.25mm; C = 0.125mm.
FIGURE 2 in Odontonia kerangcaris sp. nov., a new bivalve-associated shrimp (Crustacea, Decapoda, Palaemonidae) from East Kalimantan, revealing intrageneric host switching
FIGURE 2. Odontonia kerangcaris sp. nov., holotype male, pocl. 2.1mm, MZB 5341. A, anterior carapace and appendages, dorsal view; B, anterior part of carapace, rostrum and eyes, dorsolateral view; C, tail-fan and sixth abdominal segment, lateral view; D, telson and uropods, dorsal view; E, distal part of telson, dorsal view. Scale bars: A–C = 1mm; D = 0.5mm; E = 0.125mm.
Latitudinal influence on gametogenesis and host-parasite ecology in a marine bivalve model
<p>Reproduction and parasites have significant impacts on marine animal populations globally. This study aimed to investigate the associative effects of host reproduction and a host-parasite interplay on a marine bivalve, along a geographic gradient of latitude. Cockles <i>Cerastoderma edule</i> were sampled from five European sites (54°N to 40°N), between April 2018 and October 2019. A histological survey provided data on trematode (metacercaria and sporocyst life stages), prevalence and cockle stage of gametogenesis to assess the influence of a latitudinal gradient on both interplays. Sex ratios at the northernmost sites were skewed towards females and spawning size was reduced at the lower latitudes. Trematode infection did not follow a latitudinal gradient. Localised site-related drivers, namely: seawater temperature varied spatially, having an impact on cockle-trematode interactions. Spawning was related to elevated temperatures at all sites. Prolonged spawning occurred at southern latitudes, where seawater temperatures were warmer. Trematode prevalence and the impact of trematodes on gametogenesis were found to be spatially variable, but not latitudinally. Therefore it is not possible to determine the likelihood of boom and bust events in cockles, based on the latitudinal location of a population. In terms of sublethal impacts, it appeared that energy was allocated to reproduction rather than somatic growth in southern populations, with less energy allocated to reproduction in the larger, northern cockles. The demonstrated spatial trend of energy allocation indicates the potential of a temporal trend of reduced cockle growth at northern sites, as a result of warming sea temperatures. This awareness of the spatially varying drivers of populations is crucial considering the potential for these drivers/inhibitors to be exacerbated in a changing marine environment.</p>
BIRUG 19231 - Swiftopecten swiftii - Bivalve
BIRUG 19231, a specimen of 'Swift's scallop', was originally identified as '*Pecten swifti* ' when it was donated to the museum. However, the species has since been moved to the genus *Swiftopecten*. This species goes through a unique growth change during November and December, where the shells will increase in volume to prepare for the mating season. What is more interesting, during these months, is that sexual dimorphism (a physical difference between males and females of the same species) is present where the females will grow a larger bulge where the shells connect compared to males to accommodate for the ovary. The shells of this animal can vary from white, orange, pink to yellow. They are only found in the Japan Sea and can grow up to 20cm long. This specimen was collected from Japan by Sowerby in 1906 and given to the Museum in 1916 by Sir George H. Holcroft. Scanning was performed by Sian Miller using an Artec Spider 3D scanner. Description by Jonathan Kimel. Source: Objaverse 1.0 / Sketchfab
Figure 15 in Living together in dead coral rocks: macrosymbiotic communities associated with Bonellia echiuran worms (Annelida: Thalassematidae: Bonelliinae), involving new commensal bivalve and amphipod species
Figure 15. Leucothoe bonelliae holotype (SMBL-V0661): (A) upper lip, dorsal; (B) left mandible, dorsal; (C) right mandible, dorsal; (D) left maxilla 1, ventral; (E) left maxilla 2, ventral; (F) lower lip, dorsal; (G) right maxilliped, dorsal. Scale bar = 100 µm.
Figure 3 in Living together in dead coral rocks: macrosymbiotic communities associated with Bonellia echiuran worms (Annelida: Thalassematidae: Bonelliinae), involving new commensal bivalve and amphipod species
Figure 3. Haplotype network from COI data for Bonellia sp. aff. minor from Kushimoto and Okinawa, Japan. Each connection represents one inferred base-pair change.
Figure 12 in Living together in dead coral rocks: macrosymbiotic communities associated with Bonellia echiuran worms (Annelida: Thalassematidae: Bonelliinae), involving new commensal bivalve and amphipod species
Figure 12. Basterotia bonelliphila (paratype NSMT-Mo 79471). A, B, External view of right and left valves. C, D, Internal view of right and left valves. E, F, Hinge structure of right and left valves. G, H, Prodissoconch II of right and left valves. Abbreviations: ac, anterior cardinal tooth; exl, external ligament; p2, prodissoconch II. Scale bars = 1 mm (A–D), 100 µm (E–H).
Figure 6 in Living together in dead coral rocks: macrosymbiotic communities associated with Bonellia echiuran worms (Annelida: Thalassematidae: Bonelliinae), involving new commensal bivalve and amphipod species
Figure 6. Micro-CT images of two burrows (A and B) of Bonellia sp. aff. minor. Burrow openings are indicated by white arrowheads. The blue and yellow portions indicate sediments occupied in burrows and the burrow cavity, respectively. Scale bars = 5 mm.
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