scholarly journals Patrones de emergencia de Odonata (Insecta) en un hábitat lótico de Cuba oriental

2017 ◽  
Vol 65 (2) ◽  
Author(s):  
Adrian Trapero Quintana ◽  
Bernardo Reyes Tur
Keyword(s):  
Riparian Vegetation ◽  
Species Abundance ◽  
Weekly Basis ◽  
Emergence Pattern ◽  
Section 8 ◽  
Emergence Patterns ◽  
Lotic System ◽  
Santiago De Cuba ◽  
Fixed Section ◽  
Rainy Days

The emergence patterns of tropical odonates (dragonflies and damselflies) are scarcely known. We studied the emergence patterns of odonates in a freshwater lotic system in Giro, Northern Santiago de Cuba, between January and December 2008. We visited the locality between 09:00 and 14:00, on a weekly basis, and collected exuviae from a fixed section (8 x 1 m2) offshore, along the riparian vegetation. We collected data on species composition and, for each species, abundance, relative biomass and emergence pattern. We collected 443 exuviae belonging to 22 species: seven Zygoptera and 15 Anisoptera. Half of the annual Odonata emergence took place in the dry season (December to March) with the highest value in February (25 %). For species for which we found seven or more exuviae per month, Enallagma coecum and Macrothemis celeno tended to be a synchronal emergence. We also found temporal segregation of the emergence pattern between M. celeno and Protoneura capillaris, Neoneura maria, Progomphus integer and Scapanea frontalis. These differences were probably related to the highest annual fluctuations of temperature, relative humidity and number of rainy days per month. We concluded that there is an asynchrony and heterogeneity in Odonata emergence times in the studied freshwater lotic system.

An Emergence Model for Wild Oat (Avena fatua)

Weed Science ◽  
2007 ◽  
Vol 55 (6) ◽  
pp. 584-591 ◽  
Author(s):  
Krishona Martinson ◽  
Beverly Durgan ◽  
Frank Forcella ◽  
Jochum Wiersma ◽  
Kurt Spokas ◽  
...  
Keyword(s):  
Seedling Emergence ◽  
Soil Water Potential ◽  
The United States ◽  
Weibull Function ◽  
Wild Oat ◽  
Degree Days ◽  
Weekly Basis ◽  
Emergence Patterns ◽  
Base Soil ◽  
Permanent Quadrats

Wild oat is an economically important annual weed throughout small grain producing regions of the United States and Canada. Timely and more accurate control of wild oat may be developed if there is a better understanding of its emergence patterns. The objectives of this research were to evaluate the emergence pattern of wild oat and determine if emergence could be predicted using soil growing degree days (GDD) and/or hydrothermal time (HTT). Research plots were established at Crookston, MN, and Fargo, ND, in 2002 and 2003. On a weekly basis, naturally emerging seedlings were counted and removed from six 0.37-m2permanent quadrats randomly distributed in a wild oat–infested area. This process was repeated until no additional emergence was observed. Wild oat emergence began between May 1 and May 15 at both locations and in both years and continued for 4 to 6 wk. Base soil temperature and soil water potential associated with wild oat emergence were determined to be 1 C and −0.6 MPa, respectively. Seedling emergence was correlated with GDD and HTT but not calendar days (P = 0.15). A Weibull function was fitted to cumulative wild oat emergence and GDD and HTT. The models for GDD (n= 22,r2= 0.93, root mean square error [RMSE] = 10.7) and HTT (n= 22,r2= 0.92, RMSE = 11.2) closely fit observed emergence patterns. The latter model is the first to use HTT to predict wild oat emergence under field conditions. Both models can aid in the future study of wild oat emergence and assist growers and agricultural professionals with planning timely and more accurate wild oat control.

scholarly journals CONTRIBUTION Of RIPARIAN VEGETATION TO WATER QUALITY IN SPRING WATER ORAS

2021 ◽  
Vol 2 (1) ◽  
pp. 28-32
Author(s):  
Yulita Iryani Mamulak ◽  
Chatarina Gradict Semiun
Keyword(s):  
Water Quality ◽  
Natural Resources ◽  
Tree Species ◽  
Riparian Vegetation ◽  
Cocos Nucifera ◽  
Mangifera Indica ◽  
Species Abundance ◽  
Tectona Grandis ◽  
Artocarpus Altilis ◽  
Quality Testing

Soba Village, West Amarasi Subdistrict, Kupang Regency is located in East Nusa Tenggara Province with abundant natural resources. One of the natural resources  is  a natural spring with  abundant diversity of riparian vegetation. The diversity of riparian vegetation around water sources plays an important role in water quality. This study aimed to identify the diversity of riparian vegetation around springs and to determine water quality. The method used was plot installation, identification of riparian vegetation types, measurement of environmental factors and water quality testing. The results showed that there were 12 species of tree vegetation with a total of 74 individuals, the most common tree species found was Canangan odorata with a relative abundance of 24.32%, followed by Cocos nucifera 18.92%, and Areca sp. 16.22%. Meanwhile, the least species found were Tectona grandis, Mangifera indica, Artocarpus altilis, and Syzygium aqueum with relative species abundance of 1.35%. The results of quantitative analysis of the relative frequency found tree species Areca sp. and Cocos nucifera had the highest value, namely 19.05%. Meanwhile, the highest relative dominance value was found in thespecies Artocarpus altilis. The results of water quality testing with 3 parameters namely physical, chemical and bacteriological showed a COD value of 85.03 mg / L, a total colifrorm of 45 and a total fecal colliform  of 230

scholarly journals Odonata larvae associated with the root system of eichhornia crassipes (pontederiaceae), in the chalons dam, Santiago de Cuba, Cuba

2015 ◽  
Vol 7 (2) ◽  
pp. 130
Author(s):  
LISBET DEL ROSARIO BARBÁN-A
Keyword(s):  
Root System ◽  
Eichhornia Crassipes ◽  
Species Group ◽  
Taxonomic Composition ◽  
Climatic Variables ◽  
Accumulated Rainfall ◽  
Santiago De Cuba ◽  
The Relationship ◽  
Overflow Channel ◽  
Rainy Days

Were studied the Odonata’s larvae associated with the root system of Eichhornia crassipes (Mart. Solms) in two localities of the “Chalons”, dam overflow channel locate in Santiago de Cuba, from March 2005 to March 2006. For the Odonata’s larvae in the root system was determining the taxonomic composition and the trophic structure. A Spatial-temporal species group was estimated by the density of individuals and taxa, calculating the total volume by the method of root cone volume. In the study were collected 19 species belonging to four families. The temporal variation was correlated with the rainfall and the number of rainy days, according to Spearman Correlation. On the period of homogeneity of climatic variables the taxa’s and individuals’ density remained stable; however, the oscillations in the both densities were associated with the heterogeneity in the precipitation patterns. The densities of individual were different in both the sampled localities. The relationship between climatic variables, root volume and density of individuals suggests that the number of rainy days and accumulated rainfall influence in the abundance of certain taxa and that the roots of Eichhornia crassipes can be appraised as an important habitat for dragonflies larvae and a great place to find food for them.

RHYTHMIC EMERGENCE PATTERNS OF THE MOUNTAIN PINE BEETLE DENDROCTONUS PONDEROSAE (COLEOPTERA: SCOLYTIDAE)

1970 ◽  
Vol 102 (8) ◽  
pp. 1054-1056 ◽  
Author(s):  
J. A. Watson
Keyword(s):  
Mountain Pine Beetle ◽  
Lodgepole Pine ◽  
Dendroctonus Ponderosae ◽  
Fluctuating Temperature ◽  
Emergence Pattern ◽  
Emergence Patterns ◽  
Pine Beetle ◽  
Emergence Rate ◽  
Higher Temperature ◽  
Rate Of Emergence

AbstractLogs of lodgepole pine (Pinus conforta Dougl. var. latifolia Engelm.) supporting immature Dendroctonus ponderosae Hopkins were maintained under conditions of non-fluctuating temperature and light. The rate of emergence of the adult beetles exhibited a rhythmic, possibly circadian, emergence pattern. When the temperatures fluctuated the emergence rate was always greatest in higher temperature.

Phénologie de Tanypodinae de ruisseaux des Laurentides (Diptera; Chironomidae)

1978 ◽  
Vol 56 (5) ◽  
pp. 1129-1139 ◽  
Author(s):  
Louise Cloutier ◽  
P. P. Harper
Keyword(s):  
Weather Conditions ◽  
Emergence Period ◽  
Emergence Pattern ◽  
Emergence Patterns

Emergence of Tanypodinae (Diptera; Chironomidae) was monitored in 1972 and 1973 in several streams in the Laurentides. Only summer species occurred. All species appeared to be univoltine, except perhaps Paramerina fragilis which may be bivoltine. Two types of emergence pattern were observed: four species had a short and synchronous emergence period; eight others emerged over many weeks. Arctopelopia flavifrons and Arctopelopia americana have different emergence patterns when they coexist in the same section and when they occur alone. Considerable variations in emergence patterns between stations were often observed for the same species. Weather conditions most affected the emergence of species with extended emergence periods.

Photoperiodic cercarial emergence patterns of the digeneans Echinoparyphium recurvatum and Plagiorchis sp. from a mixed infection in Lymnaea peregra

1999 ◽  
Vol 73 (1) ◽  
pp. 59-62 ◽  
Author(s):  
A.M. McCarthy
Keyword(s):  
Single Species ◽  
Antagonistic Effect ◽  
Dark Phase ◽  
Host Snail ◽  
Emergence Pattern ◽  
Emergence Patterns ◽  
Photoperiodic Regime ◽  
Lymnaea Peregra ◽  
First Intermediate Host ◽  
Cercarial Emergence

Photoperiodic emergence patterns of the cercariae of two digeneans, Echinoparyphium recurvatum (Echinostomatidae) and Plagiorchissp. (Plagiorchiidae), were studied experimentally using a photoperiodic regime of 12 h light: 12 h dark at a constant 18°C. In single species infections of the first intermediate host snail Lymnaea peregra, the cercariae of E. recurvatum emerged exclusively during the light phase and those of Plagiorchis sp. emerged exclusively during the dark phase. In double infections, each species retained its own discrete photoperiodic emergence pattern. This result demonstrates the absence of interference between the mechanisms responsible for the photoperiodic emergence pattern of each species. A degree of interference between the two parasites in double infections of L. peregra was evident. The presence of E. recurvatum significantly reduced the number of Plagiorchis sp. cercariae emerging in a 24 h period and also delayed the mean peak emergence time of Plagiorchissp. cercariae by 2 h. This result is consistent with the well documented antagonistic effect that the redial stages of echinostomes are known to have against the sporocysts of other digeneans within the same host mollusc.

Spatial Emergence Pattern of Bronze Birch Borer, (Coleoptera: Buprestidae) from European White Birch2

1990 ◽  
Vol 25 (1) ◽  
pp. 150-157 ◽  
Author(s):  
Rodney C. Akers ◽  
David G. Nielsen
Keyword(s):  
Betula Pendula ◽  
Hole Density ◽  
Bark Thickness ◽  
White Birch ◽  
Emergence Pattern ◽  
Betula Pendula Roth ◽  
Emergence Patterns ◽  
Bronze Birch Borer

Spatial emergence patterns of the bronze birch borer, Agrilus anxius Gory, and associated parasite and woodpecker predation in European white birch, Betula pendula Roth, were examined. Beetle and total hole density (beetle + parasite + woodpecker) were significantly lower from stem bolts 6 m above ground, 0.1 to 5.0 cm in circumference, and with 0.1 to 1.5 mm bark thickness than bolts 1 to 3 m above ground, 5.1 to 60.0 cm circumference, and with 1.51 to 3.0 mm bark thickness. Significantly more emergence occurred from the southwestern quadrant of trees than from other quadrants. Beetle emergence and total hole densities were also significantly less from branches than from tree trunks.

Emergence pattern of Palmer amaranth (Amaranthus palmeri) influenced by tillage timings and residual herbicides

2020 ◽  
pp. 1-28
Author(s):  
Parminder S. Chahal ◽  
Ethann R. Barnes ◽  
Amit J. Jhala
Keyword(s):  
Weed Management ◽  
Field Experiments ◽  
Soil Surface ◽  
Palmer Amaranth ◽  
Integrated Weed Management ◽  
Weibull Function ◽  
Ps Ii ◽  
Emergence Pattern ◽  
Herbicide Resistant ◽  
Emergence Patterns

Abstract The evolution of multiple herbicide-resistant weeds, including Palmer amaranth, has necessitated the implementation of an integrated weed management (IWM) program. Understanding weed emergence patterns is critical for developing effective IWM strategies. The objective of this study was to evaluate effect of tillage timings and residual herbicides on cumulative emergence and emergence pattern of Palmer amaranth. Field experiments were conducted in 2015 and 2016 in a field naturally infested with photosystem (PS) II and 4- hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor-resistant Palmer amaranth near Shickley, Nebraska in a bare ground study, with no crop planted in the plots but residues from the preceding corn crop were present on the soil surface. Treatments consisted of shallow tillage timings (early, mid, and late), three premix corn or soybean residual herbicides, and a nontreated control. The Weibull function was fitted to cumulative Palmer amaranth emergence with day of year (DOY) and thermal time (TT) as independent variables. Year by treatment interaction was significant for time to 10%, 25%, 50%, 75%, and 90% Palmer amaranth emergence and cumulative emergence. Majority of Palmer amaranth seedlings emerged early, following early-tillage with 90% cumulative emergence occurring on DOY 172 compared with DOY 210 to 212 for mid- and late-tillage and DOY 194 in nontreated control in 2015. In 2016, 90% of cumulative emergence following early-, mid-, and late-tillage (DOY 201 to 211) were similar, and nontreated control (DOY 188) was similar to early-tillage. Nontreated control and PRE herbicide treatments had similar DOY values for 90% emergence in both years. Number of emerged Palmer amaranth seedlings over the season was higher with shallow tillage than no tillage or with PRE herbicides.

Annual patterns of emergence of some Quebec stoneflies (Insecta: Plecoptera)

1970 ◽  
Vol 48 (4) ◽  
pp. 681-694 ◽  
Author(s):  
P. P. Harper ◽  
Jean-Guy Pilon
Keyword(s):  
Related Species ◽  
Temperature Tolerance ◽  
Closely Related Species ◽  
Emergence Pattern ◽  
Climatic Variations ◽  
Emergence Patterns ◽  
Emergence Traps ◽  
Annual Patterns

Twelve series of collections of adults from emergence traps in four streams and from six different years provide data on the annual emergence patterns of Plecoptera. Of the 24 species collected, 15 were in sufficient number to be studied in detail. Each species has a typical emergence pattern which it maintains year after year despite climatic variations. Two types of pattern are distinguished: a synchronous and an extended emergence. Species with a wide temperature tolerance can, however, present both types. Usually equal numbers of both sexes are collected and the males on the whole often emerge before the females. Closely related species normally have different emergence periods.

Emergence patterns of some Plecoptera in two mountain streams in Alberta

1971 ◽  
Vol 49 (5) ◽  
pp. 657-662 ◽  
Author(s):  
D. S. Radford ◽  
R. Hartland-Rowe
Keyword(s):  
United States ◽  
British Columbia ◽  
Water Temperature ◽  
Seasonal Distribution ◽  
Mountain Streams ◽  
Emergence Pattern ◽  
Emergence Patterns ◽  
General Aspects

The seasonal distribution of Plecoptera in two mountain streams in Alberta is presented and compared with emergence patterns in the northwestern United States and southern British Columbia. Differences between the emergence periods in our study are attributed to differences in the amount of heat the streams accumulated. Some general aspects of the emergence pattern peculiar to the region, and its relation to the interaction between photoperiods and water temperature are discussed.

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