1,721,011 research outputs found
Cladocera of Hainan Island, China
No full textSinev, Artem Y., Gu, Yangliang, Han, Bo-Ping (2015): Cladocera of Hainan Island, China. Zootaxa 4006 (3): 569-585, DOI: 10.11646/zootaxa.4006.3.
FIGURE 1. Cladocera from Hainan island, adult parthenogenetic females. A-C in Cladocera of Hainan Island, China
No full textFIGURE 1. Cladocera from Hainan island, adult parthenogenetic females. A-C, Alona costata Sars, 1862 from Shuisheng reservoir (locality 35). A, lateral view. B, head pores. C, postabdomen. D-K, Coronatella trachistriata (Chen, Zhang, Liu, 1994) from Shuisheng reservoir (locality 35). D, lateral view. E, posteroventral corner of valves. F, head shield. G, head pores. H, labrum. I, postabdomen. J, antenna II, K, outer distal lobe (ODL) and inner distal lobe (IDL) of thoracic limb I. L–Q, Karualona karua (King, 1853) from locality 2. L, lateral view. M–N, posteroventral corner of valves. O-P, postabdomen. Q, outer distal lobe (ODL) and inner distal lobe (IDL) of thoracic limb I.Published as part of Sinev, Artem Y., Gu, Yangliang & Han, Bo-Ping, 2015, Cladocera of Hainan Island, China, pp. 569-585 in Zootaxa 4006 (3) on page 579, DOI: 10.11646/zootaxa.4006.3.9, http://zenodo.org/record/23904
Spatial heterogeneity of spring phytoplankton in a large tropical reservoir: could mass effect homogenize the heterogeneity by species sorting?
No full textReservoirs are river–lake hybrid ecosystems characterized by a marked longitudinal zonation and variable flushing rates depending on the use of stored waters. The structure of their phytoplankton is therefore subjected to the interplay between the environmental conditions of the different zones (species sorting) and the strength of the unidirectional flow (mass effect). The spatial distribution of spring phytoplankton was investigated in a tropical reservoir across its different zones. Phytoplankton displayed heterogeneous spatial patterns from the turbulent, nutrient-rich riverine zones to the relatively stable lacustrine zone. The analysis of this spatial heterogeneity revealed the relative importance of species sorting and mass effect in this morphologically complex reservoir. Different taxonomic groups showed different spatial patterns due to their specific physiological and morphological features, and as a result of the local environmental filtering. In the studied reservoir, the strength of the homogenizing effect of water flow did not smooth the spatial heterogeneity and played a weak role in constraining spring phytoplankton. Actually, water flow contributed to the spatial heterogeneity of phytoplankton by enhancing the local environmental differences caused by an operational drop in water level, and species sorting resulted as the primary forcing in determining spring phytoplankton spatial distribution
Bosminidae
No full textFamily Bosminidae Bosmina (Sinobosmina) fatalis Burckhardt, 1924. Found once in Muse Lake reservoir (loc. 12) in winter. Planktonic species. For description see Tanaka (2000), for description of male see Kotov et al. (2009). East Asian species distributed from Primorskii Area of Russia and Korea to Indonesia, Malaysia and Philippines. For list of records in China see Xiang et al. (2015). Bosmina (Bosmina) longirostris (O. F. Müller, 1776). Found once in a reservoir (loc. 1) in winter. Planktonic species. For description see Alonso (1996); for description of male see Kotov et al. (2009). Recorded worldwide, according to Chatterjee et al. (2013), who refer to unpublished genetical data of Taylor and Kotov, one of the few truly cosmopolitan cladocera. For list of records in China see Xiang et al. (2015). Bosminopsis deitersi (Richard, 1895). Found in reservoirs, ponds and rivers, more frequent in spring. Common planktonic species, presumed to be cosmopolitan, widely distributed in the Oriental region. For detailed description see Kotov (1997 a, b). For list of records in China see Xiang et al. (2015).Published as part of Sinev, Artem Y., Gu, Yangliang & Han, Bo-Ping, 2015, Cladocera of Hainan Island, China, pp. 569-585 in Zootaxa 4006 (3) on page 576, DOI: 10.11646/zootaxa.4006.3.9, http://zenodo.org/record/23904
Ilyocryptidae
No full textFamily Ilyocryptidae Ilyocryptus spinifer Herrick, 1882. Very common, in all types of waters. Benthic, associated with muddy or clay bottom. For detailed description see Kotov & Dumont (2000). Species is cosmopolitan since no evidence of noncosmopolitanism has been found (Kotov & Dumont 2000); common in the Oriental region including China. For list of records in China see Xiang et al. (2015). Ilyocryptus yooni Jeong, Kotov & Lee, 2012. Found in winter only in two ponds (loc. 15, 29) and in a single channel (loc. 16) with slow current. Benthic species, usually found in permanent lakes having broad, shallow water zones with well-developed littoral vegetation (Jeong et al., 2012). For detailed description see Jeong et al. (2012). The species is known from Far East of Russia, Japan, Korea; in China in Xingkai Hu, on border between Russia and China (Jeong et al. 2012), this suggest it can be expected everywhere in East China.Published as part of Sinev, Artem Y., Gu, Yangliang & Han, Bo-Ping, 2015, Cladocera of Hainan Island, China, pp. 569-585 in Zootaxa 4006 (3) on page 576, DOI: 10.11646/zootaxa.4006.3.9, http://zenodo.org/record/23904
Macrothricidae
No full textFamily Macrothricidae Macrothrix spinosa King, 1853. One of the most common species in Hainan, encountered in all types of water bodies. For description, see Smirnov (1992) and Hollwedel et al. (2000), for description of the Indochina populations see Idris (1983). Species presumed to be pantropical (Smirnov 1992), common in the Oriental region. For list of records in China see Xiang et al. (2015). Macrothrix triserialis (Brady, 1896). Common species, encountered in all types of water bodies. For description see Smirnov (1992) and Dumont et al. (2002). Species presumed to be pantropical (Smirnov 1992), but identity of Neotropical and African populations with M. triserialis s. str., described from Sri Lanka, is doubted (Dumont et al. 2002). In East Asia species is penetrating North up to South Korea (Kotov et al. 2012). Morphology of studied specimens fully agrees with that of population from terra typica (see Dumont et al. 2002). For list of records in China see Xiang et al. (2015).Published as part of Sinev, Artem Y., Gu, Yangliang & Han, Bo-Ping, 2015, Cladocera of Hainan Island, China, pp. 569-585 in Zootaxa 4006 (3) on pages 575-576, DOI: 10.11646/zootaxa.4006.3.9, http://zenodo.org/record/23904
Moinidae
No full textFamily Moinidae Moina micrura Kurz, 1874. Common species, encountered in plankton of reservoirs, ponds, and rivers, more frequent in spring. Usually rather numerous. For description see Goulden (1968). The species was described from Czech Republic, recorded in South and Central Europe, tropical Asia, Africa, North and South America (Goulden 1968), but according to Petrusek et al. (2004), M. micrura is a complex of cryptic species. Common species in Oriental region, mostly associated with temporary pools, rice fields and small shallow semi-permanent ponds. Moinodaphnia macleayi (King, 1853). Encountered in spring only, in two reservoirs, one pond and one paddy field. Littoral species, associated with muddy bottom and vegetation, attach itself to the substrate like Simocephalus. For description see Goulden (1968), and for description of the Indochina populations see Idris (1983). The species was described from Australia, and presumed to be pantropical (Goulden 1968); populations from South-East Asia are probably conspecific with Australian ones. Species rare for China, for list of records see Xiang et al. (2015).Published as part of Sinev, Artem Y., Gu, Yangliang & Han, Bo-Ping, 2015, Cladocera of Hainan Island, China, pp. 569-585 in Zootaxa 4006 (3) on page 575, DOI: 10.11646/zootaxa.4006.3.9, http://zenodo.org/record/23904
Cercopagididae Mordukhai-Boltovskoi 1968
No full textFamily Cercopagididae Mordukhai-Boltovskoi, 1968 Bythotrephes longimanus Leydig, 1860. Records: Chiang, 1964: 71 / 2 (the estuary of Kaidu He; the arm of Bosten Hu); cited by Chiang & Du, 1979: 271–273 / 192. Confirmation of its presence would be welcome; Altai lakes might harbour populations.Published as part of Xiang, Xian-Fen, Ji, Gao-Hua, Chen, Shou-Zhong, Yu, Gong-Liang, Xu, Lei, Han, Bo-Ping, Kotov, Alexey A. & Dumont, Henri J., 2015, Annotated Checklist of Chinese Cladocera (Crustacea: Branchiopoda). Part I. Haplopoda, Ctenopoda, Onychopoda and Anomopoda (families Daphniidae, Moinidae, Bosminidae, Ilyocryptidae), pp. 1-27 in Zootaxa 3904 (1) on page 4, DOI: 10.11646/zootaxa.3904.1.1, http://zenodo.org/record/28763
Spatial structure and β-diversity of phytoplankton in Tibetan Plateau lakes: nestedness or replacement?
No full textSpatial patterns and β-diversity of phytoplankton assemblages depend on the relative importance of species dispersal capacity and species-sorting. Variability in species composition, composed by differences in species richness (nestedness) and/or species replacement, may be caused by niche availability and environmental selection. A field survey was carried out in Tibetan plateau on 38 lakes. Tibetan plateau lakes, located at high elevation, are harsh ecosystems characterized by low temperatures, low available nutrients, high UV amount, and strong salinity gradients. Only well-adapted species can survive in these environments. We therefore hypothesized that environmental filtering was the main factor determining phytoplankton assemblage structure in these lakes, and that species nestedness largely contributed to Î2-diversity. Spatial analysis showed that both environmental variables and broad-scale spatial variables accounted for the variation of phytoplankton assemblages. In particular, phytoplankton was mainly shaped by spatially structured environmental heterogeneity, which resulted in low α-diversity and high Î2-diversity. In contrast to our assumption, species turnover contributed to the majority of Î2-diversity of the studied assemblages. Local environments selected species with the corresponding stress-tolerant traits. Within the narrow range of available niches, environmental filtering of phytoplankton traits induced speciesâ replacement along environmental gradients
- …
