Temporal distribution of crustaceans in forested freshwater wetlands: responses to changes in the hydroperiod

Crustaceana ◽  
2017 ◽  
Vol 90 (6) ◽  
pp. 721-734
Author(s):  
Francisco Correa-Araneda ◽  
Patricio De los Ríos-Escalante ◽  
Ricardo Figueroa ◽  
Luciano Parra-Coloma
Keyword(s):  
Temporal Distribution ◽  
Hydrological Regime ◽  
Forested Wetlands ◽  
Species Level ◽  
Freshwater Wetlands ◽  
The Other ◽  
Sampling Techniques ◽  
Southern Chile ◽  
Ephemeral Wetlands ◽  
Hydrological Regimes

Studies on crustacean communities in Chilean wetlands are scarce. The aim of this study was to characterize the crustacean community in forested wetlands from southern Chile and to establish their relation with the variations in the hydrological regime. In total, 540 samples were taken using three complementary sampling techniques in five wetlands during 2011 and 2012. The results show a total of four species of crustaceans, of which the amphipod Hyalella patagonica (Cunningham, 1871) (Hyalellidae) was dominant in ephemeral wetlands and the isopod Heterias exul (Mueller, 1892) (Janiridae) in permanent wetlands. The other species (the decapods Parastacus pugnax (Poeppig, 1835) (Parastacidae) and Aegla araucaniensis (Jara, 1980) (Aeglidae)) showed abundances below 6% in all wetlands. The identified crustaceans presented marked variations, both at a temporal scale and between wetlands with different hydrological regimes, both at the species level and at the crustacean community level. These patterns were mainly explained by changes registered in the annual hydroperiod and our results conform to the existing information that would indicate the importance of the inclusion of hydrological patterns in descriptions of freshwater communities.

scholarly journals Impact of Hydrotechnical Structures on Hydrological Regime of the Gwda and Drawa Rivers

2015 ◽  
Vol 34 (1) ◽  
pp. 99-110 ◽  
Author(s):  
Katarzyna Kubiak-Wójcicka ◽  
Marika Kornaś
Keyword(s):  
Comparative Analysis ◽  
Hydrological Regime ◽  
Entire Length ◽  
The Other ◽  
Other Hand ◽  
Hydropower Plants ◽  
River Profiles ◽  
The Impact ◽  
Hydrological Regimes ◽  
Ice Phenomena

Abstract The work attempts to determine the impact of hydrotechnical structures on regimes of rivers. The aim of the article is to compare hydrological regimes of the rivers Gwda and Drawa due to the differences of hydrotechnical works located on both rivers. The Gwda River is heavily managed by hydrotechnical infrastructure. Presently, there are twelve hydropower plants located along the entire length of the river. The Drawa River, on the other hand, has little hydrotechnical infrastructure. Only two hydropower plants are located on the Drawa River. The study of the hydrological regime was carried out on the basis of the analysis of changes of water stages and ice phenomena. River profiles selected for the analysis were located downstream of hydrotechnical works, i.e. hydropower plants. The conclusions were based on the comparative analysis. The impacts were identified as the differences in processes described by the analyzed parameters

scholarly journals Comparative analysis and phylogenetic investigation of Hong Kong Ilex chloroplast genomes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bobby Lim-Ho Kong ◽  
Hyun-Seung Park ◽  
Tai-Wai David Lau ◽  
Zhixiu Lin ◽  
Tae-Jin Yang ◽  
...  
Keyword(s):  
Hong Kong ◽  
Comparative Analysis ◽  
Phylogenetic Relationships ◽  
Species Level ◽  
The Other ◽  
Trna Genes ◽  
Protein Coding ◽  
Chloroplast Genomes ◽  
Plant Group ◽  
Ilex Rotunda

AbstractIlex is a monogeneric plant group (containing approximately 600 species) in the Aquifoliaceae family and one of the most commonly used medicinal herbs. However, its taxonomy and phylogenetic relationships at the species level are debatable. Herein, we obtained the complete chloroplast genomes of all 19 Ilex types that are native to Hong Kong. The genomes are conserved in structure, gene content and arrangement. The chloroplast genomes range in size from 157,119 bp in Ilex graciliflora to 158,020 bp in Ilex kwangtungensis. All these genomes contain 125 genes, of which 88 are protein-coding and 37 are tRNA genes. Four highly varied sequences (rps16-trnQ, rpl32-trnL, ndhD-psaC and ycf1) were found. The number of repeats in the Ilex genomes is mostly conserved, but the number of repeating motifs varies. The phylogenetic relationship among the 19 Ilex genomes, together with eight other available genomes in other studies, was investigated. Most of the species could be correctly assigned to the section or even series level, consistent with previous taxonomy, except Ilex rotunda var. microcarpa, Ilex asprella var. tapuensis and Ilex chapaensis. These species were reclassified; I. rotunda was placed in the section Micrococca, while the other two were grouped with the section Pseudoaquifolium. These studies provide a better understanding of Ilex phylogeny and refine its classification.

scholarly journals In vivo tracking of transplanted macrophages with near infrared fluorescent dye reveals temporal distribution and specific homing in the liver that can be perturbed by clodronate liposomes

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0242488
Author(s):  
Satoshi Nishiwaki ◽  
Shigeki Saito ◽  
Kyosuke Takeshita ◽  
Hidefumi Kato ◽  
Ryuzo Ueda ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Normal State ◽  
Near Infrared ◽  
Temporal Distribution ◽  
Organ Damage ◽  
The Other ◽  
Acquired Immunity ◽  
Activated Macrophages ◽  
Clodronate Liposomes

Macrophages play an indispensable role in both innate and acquired immunity, while the persistence of activated macrophages can sometimes be harmful to the host, resulting in multi-organ damage. Macrophages develop from monocytes in the circulation. However, little is known about the organ affinity of macrophages in the normal state. Using in vivo imaging with XenoLight DiR®, we observed that macrophages showed strong affinity for the liver, spleen and lung, and weak affinity for the gut and bone marrow, but little or no affinity for the kidney and skin. We also found that administered macrophages were still alive 168 hours after injection. On the other hand, treatment with clodronate liposomes, which are readily taken up by macrophages via phagocytosis, strongly reduced the number of macrophages in the liver, spleen and lung.

scholarly journals On the selection of precipitation products for the regionalisation of hydrological model parameters

2021 ◽  
Vol 25 (11) ◽  
pp. 5805-5837
Author(s):  
Oscar M. Baez-Villanueva ◽  
Mauricio Zambrano-Bigiarini ◽  
Pablo A. Mendoza ◽  
Ian McNamara ◽  
Hylke E. Beck ◽  
...  
Keyword(s):  
Hydrological Model ◽  
Model Performance ◽  
Temporal Distribution ◽  
Hydrological Regime ◽  
Hydrologic Model ◽  
Spatial Proximity ◽  
Model Parameters ◽  
Ungauged Catchments ◽  
Water Balance Components ◽  
Feature Similarity

Abstract. Over the past decades, novel parameter regionalisation techniques have been developed to predict streamflow in data-scarce regions. In this paper, we examined how the choice of gridded daily precipitation (P) products affects the relative performance of three well-known parameter regionalisation techniques (spatial proximity, feature similarity, and parameter regression) over 100 near-natural catchments with diverse hydrological regimes across Chile. We set up and calibrated a conceptual semi-distributed HBV-like hydrological model (TUWmodel) for each catchment, using four P products (CR2MET, RF-MEP, ERA5, and MSWEPv2.8). We assessed the ability of these regionalisation techniques to transfer the parameters of a rainfall-runoff model, implementing a leave-one-out cross-validation procedure for each P product. Despite differences in the spatio-temporal distribution of P, all products provided good performance during calibration (median Kling–Gupta efficiencies (KGE′s) > 0.77), two independent verification periods (median KGE′s >0.70 and 0.61, for near-normal and dry conditions, respectively), and regionalisation (median KGE′s for the best method ranging from 0.56 to 0.63). We show how model calibration is able to compensate, to some extent, differences between P forcings by adjusting model parameters and thus the water balance components. Overall, feature similarity provided the best results, followed by spatial proximity, while parameter regression resulted in the worst performance, reinforcing the importance of transferring complete model parameter sets to ungauged catchments. Our results suggest that (i) merging P products and ground-based measurements does not necessarily translate into an improved hydrologic model performance; (ii) the spatial resolution of P products does not substantially affect the regionalisation performance; (iii) a P product that provides the best individual model performance during calibration and verification does not necessarily yield the best performance in terms of parameter regionalisation; and (iv) the model parameters and the performance of regionalisation methods are affected by the hydrological regime, with the best results for spatial proximity and feature similarity obtained for rain-dominated catchments with a minor snowmelt component.

Two types of reservoir-induced seismicity

1988 ◽  
Vol 78 (6) ◽  
pp. 2025-2040
Author(s):  
D.W. Simpson ◽  
W.S. Leith ◽  
C.H. Scholz
Keyword(s):  
Normal Stress ◽  
Pore Pressure ◽  
Induced Seismicity ◽  
Elastic Stress ◽  
Pore Space ◽  
Temporal Distribution ◽  
The Other ◽  
Elastic Response ◽  
Reservoir Induced Seismicity ◽  
Effective Normal Stress

Abstract The temporal distribution of induced seismicity following the filling of large reservoirs shows two types of response. At some reservoirs, seismicity begins almost immediately following the first filling of the reservoir. At others, pronounced increases in seismicity are not observed until a number of seasonal filling cycles have passed. These differences in response may correspond to two fundamental mechanisms by which a reservoir can modify the strength of the crust—one related to rapid increases in elastic stress due to the load of the reservoir and the other to the more gradual diffusion of water from the reservoir to hypocentral depths. Decreased strength can arise from changes in either elastic stress (decreased normal stress or increased shear stress) or from decreased effective normal stress due to increased pore pressure. Pore pressure at hypocentral depths can rise rapidly, from a coupled elastic response due to compaction of pore space, or more slowly, with the diffusion of water from the surface.

Peonza: new gastropod genus from the middle Tertiary of Patagonia and Chile

1994 ◽  
Vol 68 (2) ◽  
pp. 279-286 ◽  
Author(s):  
Amalia M. Olivera ◽  
William J. Zinsmeister ◽  
S. Graciela Parma
Keyword(s):  
New Species ◽  
Temporal Distribution ◽  
Late Eocene ◽  
Tierra Del Fuego ◽  
Early Miocene ◽  
Late Oligocene ◽  
Southern Chile ◽  
Santa Cruz ◽  
Two New Species

A new Tertiary gastropod genus, Peonza n. gen., is described, along with two new species, P. torquata from southern Argentina and P. benjamina from southern Chile. These muricacean gastropods, of uncertain familial status, occur in the late Eocene San Julián Formation and in the late Oligocene to early Miocene? Monte León Formation, Santa Cruz Province, Argentina. They also were recorded in the (probably) Oligocene Magellanian beds in Tierra del Fuego, Argentina, and in early Miocene deposits of the Tres Montes region in the Chilean Canals. In spite of the small number of specimens, Peonza n. gen. seems to have had a wide geographic and temporal distribution.

Benthic community structure of the Bosphorus and surrounding area

2002 ◽  
Vol 46 (8) ◽  
pp. 37-44 ◽  
Author(s):  
A. Uysal ◽  
A. Yüksek ◽  
E. Okuş ◽  
N. Yilmaz
Keyword(s):  
Black Sea ◽  
Dominant Species ◽  
Lower Layer ◽  
Current System ◽  
Temporal Distribution ◽  
Wide Distribution ◽  
The Other ◽  
The Black Sea ◽  
Sea Of Marmara ◽  
Other Hand

Spatial and temporal distribution of benthic communities around the Strait of Istanbul (Bosphorus) and the effect of lower layer discharge on these communities have been evaluated during studies between FebruaryÐDecember 1999. Mytilus galloprovincialis was the dominant species with fasies at the Black Sea station that is not affected by the strait lower layer current system. On the other hand, another Black Sea station, influenced by the strait lower layer currents, has a similar biota to the strait stations. Species richness and diversity is highest in the strait than other areas. The dominant species is Maera grossimana. However, the station located at the Black Sea exit of the strait has a different biota, and various groups/species appeared to be dominant. Melinna palmata is the dominant species at the Sea of Marmara during the study period. Low dissolved oxygen values of lower layer and soft substratum of sediment resulted in wide distribution of Melinna palmata, adapted to these conditions. The closer stations to the strait in the Sea of Marmara have higher diversity as a result of hydrodynamic processes. On the other hand, coastal stations with low currents and inputs have lower index values, showing the negative effect of discharges and pollution.

scholarly journals The ant genus Tetramorium Mayr (Hymenoptera: Formicidae) in the Malagasy region—taxonomy of the T. bessonii, T. bonibony, T. dysalum, T. marginatum, T. tsingy, and T. weitzeckeri species groups

Zootaxa ◽  
2012 ◽  
Vol 3365 (1) ◽  
pp. 1 ◽  
Author(s):  
FRANCISCO HITA GARCIA ◽  
BRIAN L. FISHER
Keyword(s):  
New Species ◽  
Single Species ◽  
Species Level ◽  
The Other ◽  
Current Status ◽  
Species Status ◽  
The Core ◽  
Core Species ◽  
Species Groups ◽  
Level Identification

The taxonomy of the T. bessonii, T. bonibony, T. dysalum, T. marginatum, T. tsingy, and T. weitzeckeri species groups isrevised. A total of 33 species is treated, of which 27 are newly described and one is raised to species status. The T.weitzeckeri group contains the single species T. humbloti Forel, which is of Afrotropical origin and the only representativeof the group in the Malagasy region. The species T. bessonii Forel, T. dysalum Bolton, T. marginatum Forel, and T. stein-heili Forel, which were originally members of the T. weitzeckeri group, are now placed in other groups. Tetramorium bes-sonii is the core species of the T. bessonii group, which also contains the four newly described species T. artemis sp. n., T.malagasy sp. n., T. ryanphelanae sp. n., T. wardi sp. n., and T. orientale Forel stat. n., which was a junior synonym of T.bessonii but is now raised to species rank. The T. dysalum group is a moderately-sized group with ten species, of whichonly T. dysalum and T. steinheili were previously known; the other eight species are all newly described. The newly described species in this group are: T. ambatovy sp. n., T. macki sp. n., T. mallenseana sp. n., T. orc sp. n., T. robitika sp. n.,T. sargina sp. n., T. yammer sp. n., and T. vohitra sp. n. A lectotype and several paralectotypes of T. steinheili are desig-nated. Tetramorium marginatum is the central species of the T. marginatum group, which also includes the five newly de-scribed species T. valky sp. n., T. hector sp. n., T. norvigi sp. n., T. shamshir sp. n., and T. silvicola sp. n. The T. bonibonyand T. tsingy groups represent completely new groups that consist entirely of previously unknown, undescribed species.The first group holds the new species T. bonibony sp. n., T. kali sp. n., T. sada sp. n., T. nosybe sp. n., T. olana sp. n., T.popell sp. n., and T. trafo sp. n. and T. vony sp. n. The last group, the T. tsingy group, only contains the two species T. tyrionsp. n. and T. tsingy sp. n., both among the rarest Tetramorium species in Madagascar. All groups are fully revised withillustrated species-level identification keys, and all species are described/re-described and illustrated with high qualitymontage images. In addition, the current status of the Malagasy Tetramorium species groups is discussed and further modifications are proposed.

Distribution Characters of Fog in Chongqing and Causes of Fog in November 7, 2006

2013 ◽  
Vol 726-731 ◽  
pp. 1297-1300
Author(s):  
Ting Ting Liu ◽  
Yu Han ◽  
Wen Hua Jiang
Keyword(s):  
Temporal Distribution ◽  
Reanalysis Data ◽  
The Other ◽  
High Humidity ◽  
Ncep Reanalysis ◽  
Anticyclonic Circulation ◽  
The North ◽  
Low Humidity ◽  
Northwest Region ◽  
Fog Days

The paper use the observational data of Chongqing from 1981to 2010, to analyze the spatial and the temporal distribution characters. The results are the follows: (1) Chongqing has two Foggy areas, one is the north by central region with Changshou, Fuling as the center, the other is the northwest region with Hechuan, Beibei as the center. (2) The fog mainly occurs in winter, and especially often occurs in December. (3)The number of the fog days are reduces in most Chongqing areas from 1990s to 2000s. Based on the NCEP reanalysis data, the paper analyze a fog weather, the results indicate that the wind by north at 500 hpa, the anticyclonic circulation at 700 hpa, the precipitation a few days ago, the high humidity at the lower layers and low humidity at higher layers cause the fog in November 7, 2006.

OVIPOSITION PREFERENCES OF LYGUS LINEOLARIS (PALISOT DE BEAUVOIS) (HETEROPTERA: MIRIDAE) ON FOUR BRASSICA AND TWO SINAPIS SPECIES (BRASSICACEAE) IN FIELD CAGES

1997 ◽  
Vol 129 (5) ◽  
pp. 855-858 ◽  
Author(s):  
G.H. Gerber
Keyword(s):  
Host Plant ◽  
Sinapis Alba ◽  
Species Level ◽  
The Other ◽  
Choice Test ◽  
Host Plant Selection ◽  
Lygus Lineolaris ◽  
Plant Selection ◽  
Generic Level ◽  
Oviposition Preferences

AbstractThe oviposition preferences of Lygus lineolaris (Palisot de Beauvois) were studied on Brassica carinata A. Braun, Brassica juncea (L.) Czern, Brassica napus L., Brassica rapa L., Sinapis alba L. (high glucosinolates), Sinapis alba L. (low glucosinolates), and Sinapis arvensis L. in a choice test during a 14-day period in field cages. Host-plant discrimination occurred on at least two levels. The first level occurred at the generic level; ovipositing females first selected species of Sinapis on which to lay eggs and later laid on species of Brassica. On species of Sinapis, 80% or more of the total number of eggs were laid during days 1–6, whereas only 35–58% were laid during this period on species of Brassica. The second level occurred at the species level in both Brassica and Sinapis. In Brassica, significantly more eggs were laid on B. carinata and B. napus than on B. juncea; in Sinapis, significantly more eggs were laid on S. alba (high glucosinolates) than on S. arvensis. The numbers of eggs did not differ significantly among B. carinata, B. napus, and S. alba (high glucosinolates). The numbers of eggs on B. rapa and S. alba (low glucosinolate) were not significantly different from those on the other five Brassica and Sinapis hosts tested. Host-plant selection seemed to be unaffected by glucosinolate levels in the seed of S. alba.

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