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591 results for “Atyidae”
Enclosure/exclosure experiments in a montane Puerto Rican stream examining direct and indirect effects of two dominant taxa of atyid (Atyidae) shrimp, Atya lanipes Holthius and Xiphocaris elongata Guerin-Meneville (Shrimp/ Algae/ Oecologia (1993))
Freshwater shrimp dominate the faunal biomass of many tropical headwater streams: however, their role in community organization is unclear. Enclosure/exclosure experiments in a montane Puerto Rican stream examined direct and indirect effects of two dominant taxa of atyid (Atyidae) shrimp, Atya lanipes Holthius and Xiphocaris elongata Guerin-Meneville. Both shrimp taxa caused significant reductions in sediment cover on rock substrata, reducing sedimentation and enhancing algal biovolume on clay tiles in cages. When tiles incubated in shrimp exclosures for 2 wks were placed outside of cages, atyid shrimp removed 100% of sediment cover within a 30 min. observation period. Atyid shrimp appear to play an important role in stream recovery after high discharge events in rapidly removing sediments and detritus deposited on benthic substrata in pools. We evaluated the mechanism by which A. lanipes influences algae and benthic insects by comparing patterns of algal biomass, taxonomic composition and shrimp-presence treatments both with and without manual sediment removal. The shrimp exclusion treatment without manual sediment removal had significantly lower algal biomass and greater sedimentation than all other treatments. The treatment in which shrimp were excluded but sediment was manually removed, however, accrued almost the same algal biovolume as the shrimp enclosure treatment, supporting the hypothesis that sediment removal enhances the biovolume of understory algal taxa. Algal community composition was similar between stream bottom bedrock exposed to natural densities of shrimp and all experimental treatments for both Atya and Xiphocaris: a diatom community strongly dominated (78-95%) by the adnate taxon, Achnanthes lanceolata Breb ex. Kutz. Atyid shrimp are important in determining the distribution and abundance of benthic insects through both direct and indirect effects. Sessile, retreat-building chironomid larvae (Chironomidae: Diptera) are negatively affected by bo
Fig. 2 in Caridina variabilirostris (Crustacea: Decapoda: Atyidae), a new species of freshwater shrimp from Pohnpei (Micronesia)
Fig. 2. Neighbour-Joining tree of the 16S sequences of the specimens. Numbers on branches indicate bootstrap values. Letters 'M' indicate specimens firstly identified as Caridina mertoni and letters 'B' indicate specimens firstly identified as Caridina brachydactyla.
Fig. 1 in Caridina variabilirostris (Crustacea: Decapoda: Atyidae), a new species of freshwater shrimp from Pohnpei (Micronesia)
Fig. 1. Map of Pohnpei Island showing sampling stations (black dots) with their number (refers to Table 1).
Fig. 4 in Caridina variabilirostris (Crustacea: Decapoda: Atyidae), a new species of freshwater shrimp from Pohnpei (Micronesia)
Fig. 4. Caridina variabilirostris sp. nov., showing drawings made from different specimens: a. ♂, cl 3.5 mm, general appearance (MNHN-IU-2018-244). c–d. ♀, cl 3.5 mm (MNHN-IU-2018-250). c. Right mandible. d. First maxilla. b, e–h. ♀, cl 4.8 mm, (MNHN-IU-2018-238). b. Left mandible. e. Second maxilla. f. Third maxilliped. g. Second maxilliped. h. First maxilliped.
Fig. 21 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 21. Caridina poarae sp. nov. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. Eggs. k. Cephalothorax. MNHN-IU-2018-2922 (a–k).
Fig. 18 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 18. Caridina piokerai sp. nov. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. Eggs. k. Cephalothorax. MNHN-IU-2018-2900 (a–k).
Fig. 16 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 16. Caridina tupaia de Mazancourt, Marquet & Keith, 2019. Cephalothorax. MNHN-IU-2018 -2884.
Fig. 17 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 17. Caridina maeana sp. nov. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. First male pleopod. k. Second male pleopod. l. Eggs. m. Cephalothorax. MNHN-IU-2018-2889: (a–i, m), MNHN-IU-2018-2891 (j–k) and MNHN-IU-2018-2895 (l).
Fig. 12. Caridina buehleri Roux, 1934. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 12. Caridina buehleri Roux, 1934. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. Pre-anal carina. k. Eggs. l. Cephalothorax. MNHN-IU-2018-2845 (a–i, k), MNHN-IU-2015-20 (j) and MNHN-IU-2018-2846 (l).
Fig. 11 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 11. Caridina turipi sp. nov. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. Eggs. k. Cephalothorax. MNHN-IU-2014-20883 (a–f, h, j–k), MNHN-IU-2014-20882 (g) and MNHN-IU-2014-20878 (i).
Fig. 10. Caridina typus H. Milne Edwards, 1837. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 10. Caridina typus H. Milne Edwards, 1837. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Preanal carina. h. Uropodal diaeresis. i. Telson. j. First male pleopod. k. Second male pleopod. l. Eggs. m. Cephalothorax. MNHN-IU-2018-2825 (a–c, e, h), MNHN-IU-2018-2842 (d, f), MNHN-IU-2018 -2826 (g, j–k), MNHN-IU-2018-2833 (i), MNHN-IU-2018-2832 (l) and MNHN-IU-2018-2824 (m).
Fig. 8. Caridina mertoni Roux, 1911. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 8. Caridina mertoni Roux, 1911. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. First male pleopod. k. Second male pleopod. l. Eggs. m. Cephalothorax. n–o. Rostrum variations. MNHN-IU-2018-2817 (a–f, m), MNHN-IU-2018-2815 (h–i, l), MNHN-IU-2018-2816 (j–k), MNHN-IU-2017-2109 (n) and MNHN-IU-2018-2819 (g, o).
Fig. 3 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 3. Caridina barakoma sp. nov. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. First male pleopod. k. Second male pleopod. l. Eggs. m. Cephalothorax. MNHN-IU-2014-20807 (a–i, l–m) and MNHN-IU-2014-20805 (j–k).
Fig. 6 in Solomon's Gold Mine: Description or redescription of 24 species of Caridina (Crustacea: Decapoda: Atyidae) freshwater shrimps from the Solomon Islands, including 11 new species
Fig. 6. Caridina choiseul sp. nov. a. First pereiopod. b. Second pereiopod. c. Third pereiopod. d. Fifth pereiopod. e. Dactylus of third pereiopod. f. Dactylus of fifth pereiopod. g. Pre-anal carina. h. Uropodal diaeresis. i. Telson. j. First male pleopod. k. Second male pleopod. l. Eggs. m–n. Rostrum variations. o. Cephalothorax. MNHN-IU-2014-20833 (a–g (top, with spine), h, l), MNHN-IU-2014-20836 (g (botom, without spine)), MNHN-IU-2014-20831 (i), MNHN-IU-2014-20829 (j–k), MNHN-IU-2014-20827 (m), MNHN-IU-2014-20837 (n) and MNHN-IU-2014-20826 (o).
Fig. 3 in Caridina Trifasciata, A New Species Of Freshwater Shrimp (Decapoda: Atyidae) From Hong Kong
Fig. 3. Caridina trifasciata, new species, holotype male (cl 3.7 mm) (IZCAS), Tsak Yue Wu, Hong Kong. A, cephalothorax and cephalic appendages; lateral view; B, preanal carina; C, uropodal diaeresis; D. first pereiopod; E. second pereiopod; F. third pereiopod; G, dactylus of third pereiopod; H, fifth pereiopod; I. Dactylus of fifth pereiopod; J, endopod of male first pleopod; K, appendix masculina of male second pleopod. Scales: A = 1 mm; C, G, I - K = 0.2 mm; B, D - F, H = 0.5 mm; G, I, J = 0.1 mm.
Fig. 1 in Caridina Trifasciata, A New Species Of Freshwater Shrimp (Decapoda: Atyidae) From Hong Kong
Fig. 1. Caridina trifasciata, new species, live specimen, showing the characteristic colour pattern.
Fig. 5 in Caridina Trifasciata, A New Species Of Freshwater Shrimp (Decapoda: Atyidae) From Hong Kong
Fig. 5. Caridina trifasciata, new species, A-F, paratype female (cl 3.6 mm) (ZRC.), Tsak Yue Wu, Hong Kong; G, paratype male (cl 3.7 mm) (ZRC), Tsak Yue Wu, Hong Kong. A. first pereiopod; B. second pereiopod; C. third pereiopod; D, dactylus of third pereiopod; E, fifth pereiopod; F. dactylus of fifth pereiopod; G. distal end of telson. Scales: A - C, E = 0.5 mm, D, F = 0.1 mm, G = 0.2 mm.
Fig. 4 in Caridina Trifasciata, A New Species Of Freshwater Shrimp (Decapoda: Atyidae) From Hong Kong
Fig. 4. Caridina trifasciata, new species, paratype female (cl 3.6 mm) (ZRC), Tsak Yue Wu, Hong Kong. A, cephalothorax and cephalic appendages, lateral view; B, telson; C, scaphocerite; paratype female (cl 4.2 mm) D, mandible; E, maxillula; G, maxilla; F, first maxilliped; H, second maxilliped; I, third maxilliped. Scales: A = 1 mm; C - E = 0.5 mm; B, F - I = 1 mm.
FIG. 1 in West Side Story: A molecular and morphological study of Caridina longicarpus Roux, 1926 (Decapoda, Caridea, Atyidae) from New Caledonia reveals a new species
FIG. 1. — Phylogenetic tree of the studied specimens of Caridina typus H. Milne Edwards, 1837, Caridina tupaia de Mazancourt, Marquet & Keith, 2019 and Caridina longicarpus Roux, 1926) obtained by Bayesian Inference method. Numbers above branches indicate Bayesian posterior probabilities; numbers under branches indicate Maximum Likelihood bootstrap numbers.
FIG. 4. — Caridina occidentalis n in West Side Story: A molecular and morphological study of Caridina longicarpus Roux, 1926 (Decapoda, Caridea, Atyidae) from New Caledonia reveals a new species
FIG. 4. — Caridina occidentalis n. sp.: A-G, I, L, M, MNHN-IU-2018-3311: first pereiopod (A), second pereiopod (B), third pereiopod (C), fifth pereiopod (D), dactylus of third pereiopod (E), dactylus of fifth pereiopod (F), telson (G); pre-anal carina (I), eggs (L); cephalothorax (M); H, MNHN-IU-2018-3312: uropodal diaeresis; J, K, holotype MNHN-IU-2018-3309: male first pleopod (J), male second pleopod (K). Scale bars: A-D, G, J-L, 0.5 mm; E, F, 0.1 mm; M, 1 mm.
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