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42 results for “Gammarids”
Fig. 4 in Four new records of the gammarids (Crustacea, Amphipoda) from Korean waters
Fig. 4. Gordonodius zelleri (Berge, Vader and Coleman, 1999), female: A, habitus, lateral view; B, pereonites and pleonites. Scale bars = 0.5 mm (A, B).
Fig. 3. Guernea terelamina Hirayama, 1985 in Four new records of the gammarids (Crustacea, Amphipoda) from Korean waters
Fig. 3. Guernea terelamina Hirayama, 1985; female: A, habitus, lateral view; B, urosomites. Scale bars = 0.3 mm (A), 0.2 mm (B).
Fig. 2 in Four new records of the gammarids (Crustacea, Amphipoda) from Korean waters
Fig. 2. Moolapheonoides acutifalcatus Kobayashi and Ishimaru, 2005; female: A, habitus, lateral view; B, Gnathopod 1; C, Gnathopod 2. Scale bars= 0.5 mm (A), 0.1 mm (B, C).
Fig. 1. Grandidierella fasciata Ariyama, 1996 in Four new records of the gammarids (Crustacea, Amphipoda) from Korean waters
Fig. 1. Grandidierella fasciata Ariyama, 1996, male: A, habitus, lateral view; B, Gnathopod 1. Scale bars = 1 mm (A), 0.5 mm (B).
Fig. 5 in Morphology and zoogeography of the burrower-like gammarid Gammarus koshovi (Bazikalova, 1946) (Crustacea, Amphipoda, Gammaridae) - An overlooked and poorly known species in the Siberian fauna
Fig. 5. Gammarus koshovi (Bazikalova, 1946), DAS 16-013, ♀, 8.0 mm. A. Epimeral plates I–III. B. Urosoma, dorsal view. C–E. Pleopods I–III (part.). F. Uropod I. G. Uropod II. H. Uropod III. I. Telson.
Fig. 3 in Morphology and zoogeography of the burrower-like gammarid Gammarus koshovi (Bazikalova, 1946) (Crustacea, Amphipoda, Gammaridae) - An overlooked and poorly known species in the Siberian fauna
Fig. 3. Gammarus koshovi (Bazikalova, 1946), DAS 16-013, ♀, 8.0 mm. A. Head. B. Antenna I.C. Antenna II. D. Mandible, right. E. Mandible, lacinia mobilis (× 600). F. Mandible, left (part.). G. Lower lip. H. Upper lip. I. Maxilla I, right. J. Maxilla I, outer plate (× 600). K. Palp of maxilla I, left. L. Maxilla II. M. Maxilliped.
Fig. 2 in Morphology and zoogeography of the burrower-like gammarid Gammarus koshovi (Bazikalova, 1946) (Crustacea, Amphipoda, Gammaridae) - An overlooked and poorly known species in the Siberian fauna
Fig. 2. Gammarus koshovi (Bazikalova, 1946), DAS 16-013. A–C. ♀, 8.0 mm. A. Habitus, lateral view. B. Gnathopod I. C. Gnathopod II. — D–G. ♂, 7.5 mm. D. Antenna II. E. Antenna II, calceolus (× 2800). F. Gnathopod I, setation omitted. G. Gnathopod II, setation omitted.
Do alternative resources dampen functional responses of native but not alien gammarids?
<p>While aquatic invasive predators are among the most impactful trophic groups, we lack understanding of whether alternative food resources mediate adverse predatory effects and stabilise native prey communities. Here, we use comparative functional responses to examine the influence of alternative food resources (Fucus sp.) on predator-prey interaction strengths from three gammarid crustaceans, with one native (<em>Gammarus locusta</em>) and two existing and emerging invasive (<em>Gammarus tigrinus, Pontogammarus maeoticus</em>, respectively) species, towards larval chironomid prey. All gammarids exhibited Type II functional responses, irrespective of the presence of alternative seaweed disks. <em>Fucus </em>sp. disks significantly reduced predation rates overall, however, significant reductions in maximum feeding rates (i.e. functional response magnitudes) were only evident in the native species and not for the two invaders. Our results thus may suggest that alternative resources dampen the predatory interaction strength of native but not invasive alien species, concerning these three study organisms. This potentially exacerbates impacts of invasive predators relative to natives in diverse communities. Studies should increasingly consider alternative resources when quantifying ecological impacts of current and future invasive alien species compared to natives.</p>
Invader abundance and contraction of niche breadth during replacement of a native gammarid amphipod
<p>The introduction of non-native species to new locations is a growing global phenomenon with major negative effects on native species and biodiversity. Such introductions potentially bring competitors into contact leading to partial or total species replacements. This creates an opportunity to study novel species interactions as they occur, with the potential to address the strength of inter- and intraspecific interactions, most notably competition. Such potential has often not been realized, however, due to the difficulties inherent in detecting rapid and spatially expansive species interactions under natural field conditions. The invasive amphipod crustacean <i>Gammarus pulex</i> has replaced a native species, <i>Gammarus duebeni celticus</i>, in river and lake systems across Europe. This replacement process is at least partially driven by differential parasitism, cannibalism and intraguild predation, but the role of interspecific competition has yet to be resolved. Here, we examine how abundance of an invasive species may affect spatial niche breadth of a native congeneric species. We base our analyses of niche breadth on ordination and factor analysis of biological community and physical parameters, respectively, constituting a summative, multidimensional approach to niche breadth along environmental gradients. Results derived from biological and environmental niche criteria were consistent, although interspecific effects were stronger using the biological niche approach. We show that the niche breadth of the native species is constrained as abundance of the invader increases, but the converse effect does not occur. We conclude that the interaction between invasive <i>G. pulex </i>and native <i>G. d. celticus</i> under natural conditions is consistent with strong interspecific competition whereby a native, weaker competitor is replaced by a superior invasive competitor. This study indicates a strong role of interspecific competition, alongside other known interactions such as differential intraguild predation, in rapid and expansive species replacements following biological invasions.</p>
Invader abundance and contraction of niche breadth during replacement of a native gammarid amphipod
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Do alternative resources dampen functional responses of native but not alien gammarids?
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FIGURE 2 in To the origin of Lake Baikal endemic gammarid radiations, with description of two new Eulimnogammarus spp.
FIGURE 2 Eulimnogammarus etingovae sp. nov. Holotype, female. A: antenna I* (inset: accessory flagellum enlarged); B: antenna II; C: palpus of mandible; D: maxilla I*; E: maxilla II; F: maxilliped; G: propodus of gnatopod I; H: propodus of gnatopod II; I: basipodit of pereopod VII; J: uropod III; K: telson. * - composite images. Bars = 0.1 mm.
Data from: Synergistic impacts by an invasive amphipod and an invasive fish explain native gammarid extinction
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Data from: The south-western Carpathians as a centre of ancient diversity of freshwater gammarid amphipods: insights from the Gammarus fossarum species complex
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Figure 8 from: Hou Z, Li S (2018) Four new Gammarus species from Tibetan Plateau with a key to Tibetan freshwater gammarids (Crustacea, Amphipoda, Gammaridae). ZooKeys 747: 1-40. https://doi.org/10.3897/zookeys.747.21999
Figure 8 Gammarus kangdingensis sp. n., male holotype. A gnathopod I B pleopod II C pleopod I D propodus of gnathopod I (medial view) E lower lip F antenna II G maxilla II H maxilliped I telson.
Figure 5 from: Hou Z, Li S (2018) Four new Gammarus species from Tibetan Plateau with a key to Tibetan freshwater gammarids (Crustacea, Amphipoda, Gammaridae). ZooKeys 747: 1-40. https://doi.org/10.3897/zookeys.747.21999
Figure 5 Gammarus altus sp. n., male holotype. A pereopod V B pereopod VII C pereopod VI D pleopod I E pleopod II F pleopod III G dactylus of pereopod VI H dactylus of pereopod VII.
Figure 4 from: Hou Z, Li S (2018) Four new Gammarus species from Tibetan Plateau with a key to Tibetan freshwater gammarids (Crustacea, Amphipoda, Gammaridae). ZooKeys 747: 1-40. https://doi.org/10.3897/zookeys.747.21999
Figure 4 Gammarus altus sp. n., male holotype. A antenna I B antenna II C epimeral plates I–III D head E pereopod IV F pereopod III G dactylus of pereopod III H dactylus of pereopod IV.
Figure 18 from: Hou Z, Li S (2018) Four new Gammarus species from Tibetan Plateau with a key to Tibetan freshwater gammarids (Crustacea, Amphipoda, Gammaridae). ZooKeys 747: 1-40. https://doi.org/10.3897/zookeys.747.21999
Figure 18 Gammarus limosus sp. n., male holotype. A antenna I B gnathopod II C gnathopod I D propodus of gnathopod I (medial view) E propodus of gnathopod II (medial view) F pleopod I G pleopod II H pleopod III.
Figure 21 from: Hou Z, Li S (2018) Four new Gammarus species from Tibetan Plateau with a key to Tibetan freshwater gammarids (Crustacea, Amphipoda, Gammaridae). ZooKeys 747: 1-40. https://doi.org/10.3897/zookeys.747.21999
Figure 21 Gammarus limosus sp. n., female paratype. A gnathopod I B gnathopod II C propodus of gnathopod I (medial view) D propodus of gnathopod II (medial view).
Figure 7 from: Hou Z, Li S (2018) Four new Gammarus species from Tibetan Plateau with a key to Tibetan freshwater gammarids (Crustacea, Amphipoda, Gammaridae). ZooKeys 747: 1-40. https://doi.org/10.3897/zookeys.747.21999
Figure 7 Gammarus kangdingensis sp. n., male holotype. A body (lateral view) B head C urosomites (dorsal view) D epimeral plates I–III E urosomites (lateral view) F antenna I G flagellum of antenna I H left mandible I inner face of article III of right palp J incisor of right palp K left maxilla L palp of right maxilla M upper lip.
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