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7 results for “Limnomysis”
Limnomysis benedeni ingestion rate in different prey
<p>Understanding the diet preferences and food selection of invasive species is crucial to better predict their impact on community structure and ecosystem functioning. <em>Limnomysis benedeni</em>, a Ponto-Caspian invasive mysid shrimp, is one of the most successful invaders in numerous European river and lake ecosystems. While existing studies suggest potentially strong trophic impact due to high predation pressure on native plankton communities, little is known of its food selectivity between phyto- and zooplankton, under different food concentrations. Here, we therefore investigated the feeding selectivity of <em>L</em>. <em>benedeni</em> on two commonly occurring prey organisms in freshwaters, the small rotifer zooplankton <em>Brachionus calyciflorus</em> together with the microphytoplankton <em>Cryptomonas</em> sp. present in increasing densities. Our results demonstrated a clear shift in food selection, with <em>L. benedeni</em> switching from <em>B. calyciflorus</em> to <em>Cryptomonas</em> sp. already when the two prey species were provided in equal biomasses. Different functional responses were observed for the two food types, indicating somewhat different foraging mechanisms for each food type. These findings provide experimental evidence on the feeding flexibility of invasive mysid shrimps and potential implications for trophic interactions in invaded ecosystems.</p>
Limnomysis benedeni ingestion rate in different prey
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FIGURE 19. Limnomysis benedeni Czerniavsky, 1882 in The Mysidae (Crustacea: Peracarida: Mysida) in fresh and oligohaline waters of the Mediterranean. Taxonomy, biogeography, and bioinvasion
FIGURE 19. Limnomysis benedeni Czerniavsky, 1882, from the freshwater reach of the Canal d'Arles à Fos, a tributary of the Rhône River; station is 47 river km from the Mediterranean coast of France; male with body length 6.7 mm (A, C, E–M) and females with 9.0 mm (B) or 8.1 mm (D). A, anterior body region of male, dorsal (pores on carapace not to scale); B, right eye, dorsal; C, male antennula, dorsal; D, antennal scale of female, dorsal; E, male antenna with posterior lobe containing end sac of antennal gland, dorsal; F, tarsus (carpopropodus plus dactylus) of third thoracic endopod; G, third male pleopod, outer = rostral face; H, fourth male pleopod, inner = caudal face; J, fifth male pleopod, outer = rostral face; K, posterior margin of sixth pleonite, lateral; L, uropods, ventral; M, telson, dorsal.
Fig. 4. Adult male L in Filter feeding in the mysid crustacean Limnomysis benedeni: Evidence of the maxillary pump and the ventral filtration current
Fig. 4. Adult male L. benedeni fed with pre-filtered (<7 μm) green fluorescent particles (blue illumination, dorsal view). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 3 in Filter feeding in the mysid crustacean Limnomysis benedeni: Evidence of the maxillary pump and the ventral filtration current
Fig. 3. Frames from the footages of filter feeding L. benedeni (available as Additional files 1–8). A: adult male stirring up deposited particles, B: adult male on the bottom, C: adult female on the side wall, D: adult male leaning on the side wall, E: adult male leaning on the side wall, F: the same as in Fig. 3E in blue illumination, G: adult female on the side wall (close-up), H: adult male leaning on the side wall (close-up). Abbreviations: T-EX thoracic exopods, T1-EP epipod of the first thoracopod, T1 first thoracopod (maxilliped), T2 second thoracopod, MX maxilla, MD mandibula, O oostegite. Green arrows indicate currents; red arrows indicate movements of body parts (only the most noteworthy actions are indicated). The horizontal lines in Fig. 3C and G are notches on a plexi plate positioned next to the side wall the animals can hold on to. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 1 in Filter feeding in the mysid crustacean Limnomysis benedeni: Evidence of the maxillary pump and the ventral filtration current
Fig. 1. Detached right side limbs of L. benedeni (adult male, body length: 8.5 mm) from the ventral viewpoint. A: maxilla, B: first thoracic endopod and protopod, C: second thoracic endopod with the medial part of the basis, D: third thoracic endopod. Abbreviations: ex exopod, en endopod, be basal endites, ce coxal endite, fs filtering setae, pl proximal lobe. The scales are the same for all four pictures.
Fig. 2 in Filter feeding in the mysid crustacean Limnomysis benedeni: Evidence of the maxillary pump and the ventral filtration current
Fig. 2. The maxillae of L. benedeni in their original positions (adult female, body length: 10 mm). A: ventral view after the removal of the maxillipeds. B: close-up of the filtering setae (position indicated by the rectangle in Fig. 2A). The anterior direction points toward the top of the picture.
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