Seasonal variation of arthropod abundance in gaps and the understorey of a lowland moist forest in Panama

2007 ◽  
Vol 23 (2) ◽  
pp. 169-176 ◽  
Author(s):  
Lora A. Richards ◽  
Donald M. Windsor
Keyword(s):  
Rainy Season ◽  
Abiotic Factors ◽  
Food Resources ◽  
Dry Season ◽  
Young Leaf ◽  
Barro Colorado Island ◽  
Plant Densities ◽  
The Difference ◽  
Taxonomic Groups ◽  
Arthropod Abundance

Treefalls gaps contribute to the habitat heterogeneity of tropical forest floors. Previous studies have shown that these gaps play an important role in plant and bird communities, however less is known about their role in arthropod communities. Using eight Malaise traps we investigated the difference in arthropod abundance of 19 taxonomic groups between gaps and understorey for 21 wk during the rainy season and 8 wk in the dry season on Barro Colorado Island, Panama. More (33.8%) arthropods were collected in gaps during the rainy season and 32.2% more in the understorey during the dry season. To assess the possible factors contributing to these differences we measured light, plant densities and young leaf densities, as indicators of abiotic factors and food resources for insect herbivores. Arthropod abundance was negatively correlated with light in the dry season. Thus, abiotic stress may explain the pattern of abundance in the dry season. While there was no correlation with light in the rainy season, predator abundance was positively correlated with herbivore abundance. The plant and young leaf density data suggest that there is significantly higher food availability for herbivores in gaps. Thus, less stressful abiotic conditions and more food resources may contribute to more herbivores followed by more predators in gaps during the rainy season.

scholarly journals Coleopterans prospection associated to forest ecosystems of Swietenia macrophylla (King), Eastern Amazonia

2019 ◽  
Vol 40 (5) ◽  
pp. 1775
Author(s):  
Ruy Guilherme Correia ◽  
Francisco de Assis Oliveira ◽  
Leandro Silva de Souza ◽  
Raphael Lobato Prado Neves ◽  
Jéssy Anni Vilhena Senado ◽  
...  
Keyword(s):  
Functional Groups ◽  
Rainy Season ◽  
Forest Ecosystems ◽  
Dry Season ◽  
Forest Plantations ◽  
Pitfall Traps ◽  
Swietenia Macrophylla ◽  
The Difference

Few research on the entomofauna associated to forest plantations with Swietenia macrophylla (King) in Brazil has been reported. The aim of this study was to analyze the Coleoptera communities in forest ecosystems with S. macrophylla, Brazilian mahogany, with emphasis on the diversity of families and the main functional groups. The insects were collected through pitfall traps in three forest ecosystems: monoculture, consortium and forest enriched with Brazilian mahogany, during dry and rainy periods in two consecutive years. The identification of the captured insects occurred in the entomology laboratory of the Federal Rural University of Amazonia. The analysis was performed through Past Paleontological Statistic 3.14 and ANAFAU, where the difference was considered significant only when p ? 0.05. 11,358 specimens from 21 families were captured, of which 8,058 were sampled in the rainy season and 3,299 in the dry season. There was influence of seasonality and types of forest ecosystems during collection. The families Nitidulidae, Staphylinidae, Carabidae and Meloidae presented greater abundance and richness in the complex ecosystems. Anobiidae, Cerambycidae, Bostrichidae, Brentidae, Buprestidae, Curculionidae, Elateridae, Chrysomelidae and Lagriidae were considered to be pests and common to all studied ecosystems; however, the families Nitidulidae, Scarabaeidae, Tenebrionidae and Passalidae had the function of decomposers; Carabidae, Coccinellidae, Histeridae, Meloidae, Staphylinidae, Cantharidae and Hydrophilidae were the predators.

scholarly journals Hubungan Iklim Terhadap Produksi Serta Pendapatan Petani Karet di Kabupaten Padang Lawas Utara

2019 ◽  
Vol 1 (1) ◽  
pp. 56-67
Author(s):  
Irwansyah Nasution ◽  
Tumpal H.S. Siregar ◽  
Erwin Pane
Keyword(s):  
Rainy Season ◽  
Dry Season ◽  
Climate Variables ◽  
Climatic Variable ◽  
Climate Variable ◽  
The Difference ◽  
Relationship Of ◽  
Farmer Income ◽  
The Relationship ◽  
Rainy Days

This study examines the relationship of Climate Variables with Rubber Yield And Farmer Income In Three Subdistricts of Padang Lawas Utara.  This study aims to (1) to determine the effect of climate variable to rubber yield and, (2) To know the difference of farmer's income in rainy season and dry season. This research was conducted in March until May 2017. The result of research is climatic variable especially rainfall and rainy day very significant for influential  rubber yields in Three Subdistricts in Padang Lawas Utara. This may indicate that increasing rainfall amounts with higher rainy days cause a decrease in tapping days resulting in reduction of rubber productivity. There results also showed that farmers' income in rainy season difference in dry season whereas farmer income in dry season is higher than rainy season

scholarly journals Nelayan Danau Tempe: Strategi Adaptasi Masyarakat dalam Menghadapi Kondisi Perubahan Musim

2019 ◽  
Vol 4 (1) ◽  
pp. 59
Author(s):  
Icha Musywirah Hamka ◽  
Hamka Naping
Keyword(s):  
Informal Sector ◽  
Rainy Season ◽  
Economic Hardship ◽  
Dry Season ◽  
Economic Conditions ◽  
Fishing Communities ◽  
South Sulawesi ◽  
Economic Culture ◽  
The Face ◽  
The Difference

This article aims to describe how the economic culture of fishing communities in the area of Lake Tempe, Wajo Regency, South Sulawesi, in the face of tough times in two seasons. The existence of Lake Tempe made a lot of people who lived around him rely and making the Lake as a place to look for earnings. Its unique characteristics make Lake Tempe utilized in different ways in accordance with the seasons. It makes the community experience different issues between rainy season and dry season. This research used qualitative methods to get the depiction as a whole on the question of research. The results showed that the activity of fishing communities is changing depending on the season. It has resulted in the community get to know two of the famine, with different problems. The difference of the season brings socio-economic conditions of the difference is then also bring the community on different adaptation patterns. In the rainy season, people are faced with the problem of floods, and in the dry season, people should experience times of economic hardship. For that matter, any other uses different patterns. The rainy season, they adapt by designing the House in accordance with the conditions of the flood. They made rakkeang, bale-bale, Pallangga and patto'do. In the dry season, they overcame economic hardship by switching professions to become farmers, builders, and other informal sector jobs.

scholarly journals PROFIL VERTIKAL DAN HORIZONTAL PARAMETER SALINITAS, DHL, DAN TDS BERDASARKAN VARIASI MUSIMAN DI ESTUARI SUNGAI CITARUM

OSEANA ◽  
2021 ◽  
Vol 46 (1) ◽  
pp. 1-12
Author(s):  
Nurul Fahimah ◽  
Annisa Dwi Damayanti ◽  
Venny Ulya Bunga ◽  
Haryo Mubiarto
Keyword(s):  
Electrical Conductivity ◽  
Seasonal Variations ◽  
Rainy Season ◽  
Vertical Profile ◽  
Concentration Level ◽  
Dry Season ◽  
Estuary Mouth ◽  
A Value ◽  
The Difference ◽  
Total Dissolved Solid

Salinity, electrical conductivity (EC), and Total Dissolved Solid (TDS) are parameters that pose an important role in the distributions of environmental pollution substances in the estuary. The difference in salinity, EC, and TDS concentration vertically (based on the depth in the water column) and horizontally (based on the distance from the estuary mouth) will affect the process of pollutant’s transportation and transformation in the estuary. On the other hand, seasonal variations will also affect parameters. Therefore, the information related to the vertical and horizontal profiles of salinity and other parameters based on seasonal variations is necessary to study. The purpose of this study is to analyze the vertical profile and horizontal-vertical of salinity, EC, and TDS concentrations during the rainy season and dry season in the estuary of Citarum River. This research was conducted in April 2018 (rainy season) and August 2018 (dry season) when the low tide. The measurement of salinity, EC, and TDS was directly conducted in the field using a conductivity meter. The results show that the concentration level of salinity, EC, and TDS showed a vertical and horizontal difference in the estuary of the Citarum River. In addition, there are differences in the concentration of salinity, electrical conductivity, TDS in the rainy season and dry season in the estuary of the Citarum River. The level of TDS has a linear relationship between salinity and electrical conductivity, with a value of R2 >95%.

scholarly journals Effects of breeds and seaon on semen quality and fertility pf bucks in a humid tropical environment.

2021 ◽  
Vol 32 (2) ◽  
pp. 327-341
Author(s):  
N. Nwoko ◽  
S. N. Ibe
Keyword(s):  
Electrical Stimulation ◽  
Artificial Insemination ◽  
Rainy Season ◽  
Semen Quality ◽  
Progressive Increase ◽  
Dry Season ◽  
West African ◽  
Four Seasons ◽  
Semen Volume ◽  
The Difference

A breeding programme, which spanned over four seasons (early dry, late dry, and early rainy, late rainy), was carried with one west African Dwarf (WAD) buck, one red sokoto (RS) buck, eight WAD does and eight RS does. The buck were subjected electrical stimulation wiht an electrd-ejaculator and their semen collected and analysed.Fertility rate was significant (P<0.05) higher in WAD than in RS in early dry season. There was no significant eason effect (P,0.05). of season on fertility of WAD. Fertility was least in the early dry season in RS and the difference from other season was significant (P,0.05). The effect of season on both semen volume and concentration was significant (P,0.05). There was a progressive increase in both parameter from early dry season to late rainy season. However, RS showed superiorityover WAD in both parameters in all the seasons. There were no significant effects of breeds or season on allother parameters studied. The indication is that both breeds could be used for all-year-round breeding with adequate feeding in the zone. However, for purpose of artificial insemination, RS bucks, which produce larger quatities of semen with higher concentration, should be preferred.

scholarly journals Phytoplankton community structure changes in Thi Nai lagoon (South - Central Vietnam) from 2004 to 2020

2021 ◽  
Vol 43 (4) ◽  
pp. 75-94
Author(s):  
Huynh Thi Ngoc Duyen ◽  
Tran Thi Minh Hue ◽  
Tran Thi La Van ◽  
Phan Tuan Luom ◽  
Nguyen Ngoc Lam ◽  
...  
Keyword(s):  
Rainy Season ◽  
Dry Season ◽  
Mouth Area ◽  
Species Number ◽  
Phytoplankton Species ◽  
Biodiversity Indices ◽  
Phytoplankton Species Composition ◽  
South Central ◽  
The Difference ◽  
Using Data

Phytoplankton species composition, abundance, biodiversity indices and their influence by environmental conditions were examined in Thi Nai lagoon using data from four surveys in 2004, 2008, 2009 and 2020. A total of 367 taxa of phytoplankton belonging to ten groups was recorded, of which diatoms were dominant with over 60% of the total species. In Thi Nai lagoon, the number of phytoplankton species decreased from the upper lagoon (283 taxa) to the lagoon mouth area (224) and was lowest in river stations (139). The species number was much lower in the rainy season (<95 species) and increased from 2004 to 2020. Among the biodiversity indices, Shannon, ∆, s∆+, Λ+ and sФ+ were lower in the rainy season, whereas ∆*, ∆+ and Ф+ had lower values in the dry season. For long-term analysis, the differences were especially significant at upper and lower lagoon for ∆, ∆*, ∆+, s∆+ and sФ+. In the dry season, the mean density of phytoplankton was lower at the river stations and upper lagoon, but higher at the lower lagoon and the lagoon mouth area. There was a clear difference of species assemblages between the two seasons with average dissimilarities in each area ranging from 94.16% to 95.57%. During 2004–2020, the difference in ratios between the main phytoplankton groups were small over years but there was a complete change in dominance of particular species, assemblage dissimilarities were from 73.4 to 77.9, greatest between 2009 and 2020. The lagoon was low in biodiversity for the whole investigated time indicated by taxonomic index ∆+. Among biodiversity indices, species richness (S), taxonomic indices (∆*, s∆+), and phylogenetic indices (Ф+, sФ+) were more sensitive to the changes of the aquatic environment than other traditional indices.

scholarly journals Micrometeorological environments and biodiversity in a closed forest and at a tree-fall gap in central Amazonia.

2008 ◽  
Vol 18 (4) ◽  
pp. 415
Author(s):  
Akio Tsuchiya ◽  
Akira Tanaka
Keyword(s):  
Forest Inventory ◽  
Rainy Season ◽  
Dry Season ◽  
Shortwave Radiation ◽  
Net Radiation ◽  
Number Of Species ◽  
Closed Forest ◽  
Central Amazonia ◽  
Madeira River ◽  
The Difference

Micrometeorological parameters were measured in a closed forest (CF) and at a tree-fall gap (LG) near Novo Aripuanã, AM, along the Madeira River in dry season (August to September 2003) and rainy season (March 2004), and were compared to the number of species per family and the number of seedlings obtained from forest inventory. The daily averages of net radiation (W/m2) between CF and LG were 9.5:168.0 during dry season and 3.6:125.9 during rainy season, and these averages were influenced by the difference in shortwave radiation between the sites (CFPourouma, Parkia, Tachigalia, and Orbignya, meanwhile genera peculiar to closed forests (Protium, Chrysophyllum, Micropholis) were also found.

scholarly journals Diversity of arbuscular mycorrhizal fungi communities associated with cape gooseberry (Physalis peruviana L.) crops

2019 ◽  
Vol 37 (3) ◽  
pp. 239-254
Author(s):  
Margarita Ramírez-Gómez ◽  
Urley Pérez-Moncada ◽  
Diana Serralde-Ordoñez ◽  
Andrea Peñaranda-Rolón ◽  
Gabriel Roveda-Hoyos ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Rainy Season ◽  
Cultural Practices ◽  
Abiotic Factors ◽  
Arbuscular Mycorrhizal ◽  
Dry Season ◽  
Tropical Andes ◽  
Physalis Peruviana ◽  
Cape Gooseberry

The diversity of arbuscular mycorrhizal fungi (AMF) communities in agricultural systems depends on biotic and abiotic factors as well as on cultural practices. This research aimed to evaluate the diversity of AMF present in an altitudinal transect cultivated with cape gooseberry (Physalis peruviana L.). A set of 13 soil samples from cape gooseberry plantations located in the Colombian Andean mountains in the provinces of Cundinamarca and Boyaca were collected during dry (0-20 mm/month) and rainy (150-330 mm/month) seasons between 1500 and 3000 m a.s.l., in order to establish the relationship between the altitudinal characteristics and AMF diversity. The evaluation of the abundance of spores and species and diversity indexes showed the presence of 46 AMF species in the dry season and 31 in the rainy season. This shows the high diversity of AMF in the tropical Andes with spore abundance between 20 and 120 spores 10 g-1 of soil in the rainy season and between 127 and 1531 spores 10 g-1 of soil in the dry season.

Limitations in assessment of forage intake and diet composition of steers grazing tropical pastures with short-term intake rate and oesophageal fistulated steers

2006 ◽  
Vol 34 ◽  
pp. 41-47
Author(s):  
H. D. Hess ◽  
C.E. Lascano ◽  
M. Kreuzer
Keyword(s):  
Rainy Season ◽  
Daily Intake ◽  
Dry Season ◽  
Intake Rate ◽  
Short Term ◽  
Tropical Pastures ◽  
Arachis Pintoi ◽  
Herbage Intake ◽  
The Difference ◽  
The Relationship

SummaryTwo grazing trials were carried out to compare the grazing selectivity of oesophageal fistulated and intact steers, and to measure short term grazing behaviour and daily intake of steers in pastures (six pasture types) based on Brachiaria humidicola and Arachis pintoi. During the rainy season, the composition of the pasture affected the proportion of legume in the diet selected by the two groups of steers. The property of the pasture best related to legume selected by the intact steers was the legume mass in the forage available. The proportion selected by the fistulated steers was best related to the proportion of legumes in the pasture. The legume proportion selected by the two groups of steers was related to the bulk density of legumes in the forage, but the type of relationship varied between the groups. The relationship for the fistulated steers was linear, and that for the intact steers was exponential with an asymptote. During the dry season the relationships for the fistulated animals were similar to those observed during the rainy season, but the proportion of legume in the diet of the intact animals was not affected by attributes of the pasture. The pattern of intake in the short term was not affected by the height or amount of forage available during the rainy season, but during the dry season the weight per bite, and short-term intake was related to the height and amount of forage available. Daily herbage intake was not related to short-term intake.The results of the first experiment confirmed that the selection of legumes by grazing steers can vary considerably between intact and fistulated steers. Furthermore it was suggested that the difference resulted partially from the different reactions of the two groups of experimental animals to changes in the attributes of the pasture. The second experiment showed that the daily intake of forage is not necessarily related to intake behaviour in the short term.

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