Spatial distribution and temporal dynamics of high-elevation forest stands in southern Siberia

2010 ◽  
Vol 19 (6) ◽  
pp. 822-830 ◽  
Author(s):  
Vyacheslav I. Kharuk ◽  
Kenneth J. Ranson ◽  
Sergey T. Im ◽  
Alexander S. Vdovin
Keyword(s):  
Spatial Distribution ◽  
Temporal Dynamics ◽  
High Elevation ◽  
Forest Stands ◽  
Southern Siberia ◽  
High Elevation Forest

scholarly journals Spatial distribution and temporal variation of microcrustaceans assembly (Cladocera and Copepoda) in different compartments of a reservoir in the brazilian semiarid region

2018 ◽  
Vol 30 (0) ◽  
Author(s):  
Josiane Souza Santos ◽  
Nadson Ressyé Simões ◽  
Sérgio Luiz Sonoda
Keyword(s):  
Spatial Distribution ◽  
Spatial Variation ◽  
Temporal Variation ◽  
Aquatic Macrophytes ◽  
Temporal Dynamics ◽  
Lateral Compartment ◽  
Spatial And Temporal Variation ◽  
Semiarid Region ◽  
Brazilian Semiarid ◽  
Significant Spatial Variation

Abstract Aim: The objective of this study was to investigate the spatial and temporal variation of microcrustacean assemblages of a reservoir in the Brazilian semiarid region. Methods Physical and chemical water variables and samples of microcrustaceans were collected at eight sites of the reservoir between July 2013 and November 2014, in a total of seven campaigns. For this study, the reservoir was categorized in two compartments: lateral and central. Results Limnological variables showed significant temporal variation (PERMANOVA, Pseudo-F = 19.51, p = 0.001). Higher turbidity values and suspended solids were observed in the rainiest months, while during the dry months, we measured higher values of transparency, dissolved oxygen, and chlorophyll-a. It was not found significant spatial variation of limnological variables (PERMANOVA, Pseudo-F = 0.96; p = 0.394). During the study period, ten species were recorded: four Cladocera (Ceriodaphnia cornuta, Daphnia gessneri, Diaphanosoma birgei and Diaphanosoma spinulosum ) three Copepoda Calanoida (Argyrodiaptomus azevedoi, Notodiaptomus cearensis and Notodiaptomus iheringi) and three Copepoda Cyclopoida (Macrocyclops albidus, Thermocyclops minutus and Thermocyclops decipiens). The microcrustacean assemblages showed significant temporal variation (PERMANOVA, Pseudo-F = 4.34; p = 0.001) as well as significant spatial variation (PERMANOVA, Pseudo-F = 9.46; p = 0.001). The highest values of abundance and richness were observed in the lateral compartment, this result is mainly related to the presence of aquatic macrophytes in this region, because the analysis of partial RDA indicated that limnological variables explained only 11% of this variation (Pseudo-F = 2.08, p = 0.001). Conclusions The results suggest that the seasonality of the semiarid is an important factor in the temporal dynamics of the limnological variables, while the aquatic macrophytes play an important role in the spatial distribution of the microcrustacean assembly.

­A new species of phytotelm breeding frog (Anura: Rhacophoridae) from the Central Highlands of Vietnam

Zootaxa ◽  
2020 ◽  
Vol 4779 (3) ◽  
pp. 341-354
Author(s):  
JODI J. L. ROWLEY ◽  
DUONG THI THUY LE ◽  
HUY DUC HOANG ◽  
TRUNG TIEN CAO ◽  
VINH QUANG DAU
Keyword(s):  
New Species ◽  
Body Size ◽  
Dorsal Surface ◽  
High Elevation ◽  
Evergreen Forest ◽  
Adult Males ◽  
Central Vietnam ◽  
Hands And Feet ◽  
A New Species ◽  
High Elevation Forest

We describe a new species of phytotelm-breeding rhacophorid frog from central Vietnam. Gracixalus trieng sp. nov. is distinguished from all congeners by a combination of (1) body size medium (37.2–41.4 mm in five adult males), (2) snout rounded in dorsal and lateral views, (3) dorsal surface brown or yellowish with a darker brown interorbital crossbar and inverse-Y shape on the back, (4) throat and chest yellow or yellowish brown with pinkish mottling and belly and ventral surfaces of limbs including hands and feet pinkish, (5) tympanum and supratympanic fold distinct, (6) iris pale gold with darker gold radiating out from anterior and posterior edges of pupil, (7) majority of dorsal body and limb surfaces smooth in adults, with some individuals having sparsely distributed low, irregular tubercles, (8) nuptial pads on fingers I and II in adult males, and (9) eggs deposited as a tightly spaced array of non-pendent eggs on the wall of a phytotelmon. The species occurs in syntopy with G. lumarius. At present, Gracixalus trieng sp. nov. is known only from montane bamboo and evergreen forest (>1700 m) on Mount Ngoc Linh and adjacent peaks; and it is likely to be restricted to high-elevation forest with an estimated geographical distribution of <1000 km2. 

Evaporative water loss simulation improves models’ prediction of habitat suitability for a high-elevation forest skink

Oecologia ◽  
2020 ◽  
Vol 192 (3) ◽  
pp. 657-669 ◽  
Author(s):  
Shu-Ping Huang ◽  
Ruth E. Kearley ◽  
Kuan-Wei Hung ◽  
Warren P. Porter
Keyword(s):  
Water Loss ◽  
Habitat Suitability ◽  
High Elevation ◽  
Evaporative Water Loss ◽  
Evaporative Water ◽  
High Elevation Forest

Seed regeneration of Scots pine in boreal forest stands dominated by lichen and feather moss

1995 ◽  
Vol 25 (5) ◽  
pp. 713-723 ◽  
Author(s):  
Ingeborg Steijlen ◽  
Marie-Charlotte Nilsson ◽  
Olle Zackrisson
Keyword(s):  
Seed Germination ◽  
Scots Pine ◽  
Field Experiments ◽  
Temporal Dynamics ◽  
Ground Cover ◽  
Tree Regeneration ◽  
Ground Vegetation ◽  
Forest Stands ◽  
Pine Seedlings ◽  
Natural Establishment

Six old-growth, late postfire Scots pine (Pinussylvestris L.) dominated forest stands of the Vaccinium–Cladina type were selected along a latitudinal gradient in northern Sweden. In two of the stands, Scots pine seedlings that had naturally regenerated during the last 40 years were surveyed in relation to field- and bottom-layer vegetation. The most abundant forest floor species, viz. Cladina spp., occupied 41% of the ground cover and dominated the microhabitat of Scots pine seedlings <10 years old. The second most common species, Pleuroziumschreberi (Bird.) Mitt., which occupied 10 and 20% of the ground cover at the two sites, was, in contrast, only found to cover less than 3% of the microhabitat of the seedlings < 10 years old. With increasing age of seedlings (>10 years), however, the cover of Cladina spp. significantly decreased and the cover of P. schreberi and various ericaceous species slightly increased. Thus Scots pine seedlings initially establish in lichen-dominated vegetation but as they develop P. schreberi and ericaceous species gradually become more abundant in the ground vegetation. The relationships between natural establishment patterns and microhabitat were further empirically tested by sowing seeds of Scots pine in patches of Cladina spp. and patches of P. schreberi. Seeding was performed in six sites during 3 consecutive years. A significant higher number of established Scots pine seedlings were found in Cladina spp. vegetation than in P. schreberi dominated vegetation, and Scots pine seedlings in P. schreberi experienced a significantly higher mortality. Laboratory studies indicated a negative chemical influence by P. schreberi on Scots pine seed germination but not on radicle growth of pregerminated seeds. The negative influence of P. schreberi on Scots pine seed germination and seedling survival in the field experiments is interpreted as an effect of moisture factors, chemical interference, and barriers of nutrient availability. Age structures of naturally established Scots pine showed evidence of continuous regeneration over the last 40 years. The study emphasizes the importance of biotically mediated regeneration patterns in explaining spatial stand structure and temporal dynamics in northern boreal Scots pine forest ecosystems during prolonged absence of fire. Tree regeneration tends not to be associated with mesoscale characteristics such as gaps and tip-up mounds, but rather with microhabitat conditions. The results have implications for predicting the effect of climatic warming.

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