scholarly journals KEANEKARAGAMAN HYMENOPTERA PARASITOID PADA STURUKTUR LANSKAP PERTANIAN BERBEDA DI DAERAH ALIRAN SUNGAI (DAS) CIANJUR, JAWA BARAT

2007 ◽  
Vol 7 (1) ◽  
pp. 10-20
Author(s):  
Yaherwandi Yaherwandi ◽  
S. Manuwoto ◽  
D. Buchori ◽  
P. Hidayat ◽  
L.B. Prasetyo
Keyword(s):  
Biological Control ◽  
Cluster Analysis ◽  
Species Richness ◽  
Natural Enemies ◽  
Landscape Structure ◽  
Rice Field ◽  
Agricultural Landscape ◽  
Diversity Indices ◽  
Complex Problem ◽  
And Cluster Analysis

Diversity of Hymenoptera Parasitoid in Different Agricultural Landscape at Cianjur Watershed, West Java. Understanding how the landscape structure affect the interaction between crops, pests and their natural enemies is a complex problem that can significantly impact on the success or failur of insect biological control. Hymenoptera parasitoid are particularly important natural enemies because of their great diversity and effectiveness as agents of biological control. The objective of this research is to study the diversity of Hymenoptera parasitoid in rice field at Cianjur Watershed. Insects were sampled using three trapping techniques (farmcop, insect net and yellow pan trap). Species accumulative curves, Jackknife-1 estimator, indices of diversity, indices of community similarities and cluster analysis were applied to analyze the data. Results indicated that there were 2750 speciment consist of 26 family and 325 species of Hymenoptera parasitoid in rice fields at Cianjur Watershed. Diversity of Hymenoptera parasitoid were found to be influenced by the landscape structure and seasone of  ricefield. Species richness and diversity were higher in Nyalindung landscape than Gasol and Selajambe landscape.

scholarly journals Struktur Komunitas Hymenoptera Parasitoid Pada Berbagai Lanskap Pertanian Di Sumatra Barat

2016 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Yaherwandi Yaherwandi
Keyword(s):  
Biological Control ◽  
Species Richness ◽  
Natural Enemies ◽  
Landscape Structure ◽  
Complex Problem ◽  
Agricultural Ecosystem ◽  
Species Richness And Diversity ◽  
Ecosystem Diversity ◽  
Rice Ecosystem

Understanding how the landscape structure affect the interaction between crops, pests and their natural enemies is a complex problem that can significantly impact on the success or failure of insect biological control. Hymenoptera parasitoids are particularly important natural enemies because of their great diversity and effectiveness as agents of biological control. The objective of this research is to study the diversity of Hymenoptera parasitoid on some vegetables and rice ecosystem in West Sumatera. Hymenoptera parasitoids were sampled using three trapping techniques (farmcop, insect net and yellow pan trap). Species accumulative curves, Jackknife-1 estimator, and indices of diversity were applied to analyze the data. Results indicated that there were 1522 specimen consist of 22 families and 148 species of Hymenoptera parasitoid on agricultural ecosystem in west Sumatera. Braconidae and Ichneumonidae were dominant Hymenoptera parasitoid family in vegetables ecosystem. Contrast, Mymaridae, Diapriidae, and Eulophidae were dominance of Hymenoptera parasitoid famili in rice ecosystem. Diversity of Hymenoptera parasitoid was influenced by the landscape structure. Species richness and diversity were higher in polyculture ecosystem than monoculture.

Field Margin Weed-Species Diversity in Relation to Landscape Attributes and Adjacent Land Use

Weed Science ◽  
2007 ◽  
Vol 55 (2) ◽  
pp. 129-136 ◽  
Author(s):  
Lynn M. Sosnoskie ◽  
Edward C. Luschei ◽  
Mark A. Fanning
Keyword(s):  
Land Use ◽  
Species Richness ◽  
Agricultural Landscape ◽  
Elevation Gradient ◽  
Shape Index ◽  
Diversity Indices ◽  
Weed Species ◽  
Field Margin ◽  
Local Climate ◽  
Modeling Strategy

The importance of managing weeds in seminatural habitats that are adjacent to farm fields is unclear. Weedy-margin vegetation may harbor pests or pathogens and may ALSo serve as source populations for ongoing immigration of weeds into the field. It is ALSo possible, however, that margin vegetation provides habitat for organisms that consume weed seeds or suppress the likelihood of pest or pathogen outbreak. We examined the nature of margin habitat using spatial-scaling of Weed-Species richness as an ecological assay. In 2003, we recorded the occurrence of weedy species along the perimeters of 63 fields in Wisconsin. The fields were distributed within six counties that differed in topography, geological history, local climate, and soil type and which spanned the range of variability in the agricultural landscape. We identified seven habitats that differed in geology and land use. The relationship between species richness and margin class was estimated using an analog of the power law. Additionally, we investigated broadscale correlates of habitat heterogeneity at the field level, using a modeling strategy that included additional explanatory factors logically connected to plant diversity. Using a model-confrontation approach, the survey supported the inclusion of two topographical diversity indices, elevation gradient and a field-shape index, into our model. Our broadscale survey provides information on one of a suite of important considerations needed to make decisions about the importance of managing weeds in field margins.

scholarly journals Sponge diversity and community composition in Irish bathyal coral reefs

2007 ◽  
Vol 76 (2) ◽  
pp. 121-142 ◽  
Author(s):  
Rob W.M. van Soest ◽  
Daniel F.R. Cleary ◽  
Mario J. de Kluijver ◽  
Marc S.S. Lavaleye ◽  
Connie Maier ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Species Richness ◽  
Coral Reefs ◽  
Community Composition ◽  
Live Coral ◽  
The West ◽  
Sponge Diversity ◽  
And Cluster Analysis ◽  
Pooled Samples ◽  
Reef Mound

Sponge diversity and community composition in bathyal cold water coral reefs (CWRs) were examined at 500-900 m depth on the southeastern slopes of Rockall Bank and the northwestern slope of Porcupine Bank, to the west of Ireland in 2004 and 2005 with boxcores. A total of 104 boxcore samples, supplemented with 10 trawl/dredge attempts, were analyzed for the presence and abundance of sponges, using microscopical examination of (sub)samples of collected coral branches, and semi-quantitative macroscopic examination. Approximate minimum size of identified and counted sponge individuals was 1 mm. Literature data were added to the Porcupine Bank results to compensate for a less intensive sampling program in that location. Species richness and abundance were determined at local (sample diversity, pooled-sample diversity, local reef diversity), between-reef (diversity of two reef areas at 15 km distance), and regional scales (diversity of three reef areas over a distance of 200 km). Abiotic and biotic parameters including depth, the presence and cover of live coral, dead coral and sand, local reef, and orientation towards the nearest reef mound summit, were included in a constrained ordination technique (RDA); a Monte Carlo forward selection procedure was used to obtain significant predictors of variation in composition. The results of this analysis were compared with unconstrained ordination (PCA) and cluster analysis. The presence of live coral, depth and the local reefs C1 and C3 proved to be significant predictors of variation in sponge composition. The PCA and cluster analysis confirmed these results. Sample species richness was consistently heterogeneous from zero species and individuals up to 57 species and 90 individuals per (boxcore) sample. Species richness of local reefs determined from pooled samples showed the three localities studied to have similar species richness, namely 105-122 species in each location. Species richness was highest in samples with relatively low live coral cover. As in the RDA, live coral presence and depth appeared to be responsible for most of the variation observed in the cluster results. Cluster analysis of Bray-Curtis dissimilarity values of the pooled samples of all three reef localities using presence/absence data of all available samples indicated that distance appeared to structure the composition of the sponge assemblages of the three reef mound areas, but much less so within and among local reefs. Bathyal reefs of the regions to the west of Ireland were found to have a combined sponge species richness of 191 species, exceeding the richness of individual reef mound areas by c. 38-45%. Sponge presence in CWRs is clearly structured and controlled by biotic and abiotic factors. In particular, live coral presence appears a significant predictor of CWR sponge composition and diversity.

scholarly journals More pests but less treatments: ambivalent effect of landscape complexity on Conservation Biological Control

2021 ◽  
Author(s):  
Patrizia Zamberletti ◽  
Khadija Sabir ◽  
Thomas Opitz ◽  
Olivier Bonnefon ◽  
Edith Gabriel ◽  
...  
Keyword(s):  
Biological Control ◽  
Landscape Structure ◽  
Agricultural Landscape ◽  
Multiple Scales ◽  
Conservation Biological Control ◽  
Agricultural Landscapes ◽  
Predator Population ◽  
Natural Habitats ◽  
Landscape Complexity ◽  
Spatio Temporal

AbstractIn agricultural landscapes, the amount and organization of crops and semi-natural habitats (SNH) have the potential to promote a bundle of ecosystem services due to their influence on ecological community at multiple spatio-temporal scales. SNH are relatively undisturbed and are often source of complementary resources and refuges, supporting more diverse and abundant natural pest enemies. However, the nexus of SNH proportion and organization with pest suppression is not trivial. It is thus crucial to understand how the behavior of pest and auxiliary species, the underlying landscape structure, and their interaction may influence conservation biological control (CBC). Here, we develop a generative stochastic landscape model to simulate realistic agricultural landscape compositions and configurations of fields and linear elements. Generated landscapes are used as spatial support over which we simulate a spatially explicit predator-prey dynamic model. We find that SNH boost predator population, but predator movement from hedges to fields is fundamental for an efficient pest regulation by auxiliaries and to decrease pesticide treatments. Moreover landscape elements may lead to different effects on pest reduction depending on the considered scale. Integration of species behaviors and traits with landscape structure at multiple scales are needed to provide useful insights for CBC.

scholarly journals Crop Diversity at the Landscape Level Affects the Composition and Structure of the Vegetation-Dwelling Arthropod Communities in Naked Oat (Avena Chinensis) Fields

2020 ◽  
Vol 18 (1) ◽  
pp. 30
Author(s):  
Huan Zhao ◽  
Jiahuan Li ◽  
Lizhu Guo ◽  
Kun Wang
Keyword(s):  
Biological Control ◽  
Species Richness ◽  
Natural Enemies ◽  
Landscape Scale ◽  
Crop Diversity ◽  
Small Scale ◽  
Arthropod Communities ◽  
Planting Pattern ◽  
Naked Oat ◽  
Composition And Structure

The expansion of agriculture and intensive mechanized production have resulted in the loss of habitats and biodiversity, which has led to the loss of ecological services such as the biological control of pests and diseases, and insect-borne pollination. Current studies mainly focus on the impact of small-scale crop diversity (such as intercropping) on ecological service but lack research on the effects of crop diversity at the landscape scale. In this study, vegetation-dwelling arthropods in naked oat (Avena chinensis) fields under different planting patterns were collected at different growth stages by standardized sweep netting sampling, and the differences in arthropod communities and temporal dynamics were analyzed. Taking this information as an example, the effects of crop diversity at the landscape scale caused by different planting patterns on arthropod communities were studied. It was found that herbivores were the most abundant functional group in the arthropod community in naked oat fields, accounting for 70.13% of the total abundance, followed by natural enemies, accounting for 23.45%, and, finally, other insects. The abundance and species richness of natural enemies in naked oat fields under diversified planting pattern were significantly higher than those under intensive planting pattern, while the abundance and species richness of herbivorous pests showed no significant difference between the two planting patterns. Planting patterns significantly affected the composition and structure of arthropod communities in naked oat fields. Significantly higher ratio of natural enemy to pest and more diverse natural enemies under the diversified planting pattern have shown better biological control potential and the significance of biodiversity protection.

scholarly journals The dynamics of Arthropod diversity and abundance in rice field ecosystem in Central Lombok, Indonesia

2020 ◽  
Vol 21 (12) ◽  
Author(s):  
Ruth Stella Petrunella Thei ◽  
Abdul Latief Abadi ◽  
Gatot Mudjiono ◽  
Didik Suprayogo
Keyword(s):  
Species Richness ◽  
Natural Enemies ◽  
Rice Field ◽  
Diversity Index ◽  
Population Control ◽  
Vital Role ◽  
Shannon Index ◽  
Arthropod Diversity ◽  
Arthropod Species ◽  
Field Ecosystem

Abstract. Thei RSP, Abadi AL, Mudjiono G, Suprayogo D. 2020. The dynamics of Arthropod diversity and abundance in rice field ecosystem in Central Lombok, Indonesia. Biodiversitas 21: 5850-5857. Arthropods have roles as pests, decomposers, pollinators, and natural enemies of pests. Natural enemies play a vital role in pest population control by predation or parasitism. A study of the arthropod community in the rice field ecosystem was conducted in Central Lombok, Indonesia from December 2009 to March 2010 in order to elucidate the composition, structure, and dynamic diversity of arthropods present. Arthropod sampling was done by pitfall traps, yellow pan traps, and insect net. Arthropod dynamic diversity, especially of natural enemies, was determined by diversity index, dominance index, evenness analysis, and pictorial analysis. Based on taxonomical perspective, as many as 98 arthropod species were found, including 85 insect species from 59 families and 9 orders; and 13 spider species in 6 families. Based on the ecological functions, predator arthropods were the most common (33 species, dominated by spiders), but the phytophage arthropods had the most species richness (49.34%). A high Shannon index (3.18) and Pilou index (0.7) indicated dominant arthropods in the ecosystem. Arthropod species richness and diversity increased alongside rice development and decreased after harvest.

Ascidian diversity (Chordata: Tunicata) from Andaman and Nicobar Islands, India

2018 ◽  
Vol 47 (2) ◽  
pp. 107-117 ◽  
Author(s):  
Rajaram Murugan ◽  
Gnanakkan Ananthan
Keyword(s):  
Cluster Analysis ◽  
Species Richness ◽  
Hot Spots ◽  
Field Research ◽  
Wiener Index ◽  
Diversity Indices ◽  
Economic Importance ◽  
Andaman And Nicobar Islands ◽  
Nicobar Islands ◽  
The Rich

Abstract Ascidians are filter-feeding sac-like marine urochordates of great evolutionary, ecological and economic importance. Andaman and Nicobar Islands are one of the most important hot spots of biodiversity in India, while the ascidian diversity of this region is very scanty. Ascidians belonging to 29 species were identified at the Andaman and Nicobar Islands during the field research carried out from March 2014 to April 2015. Eight species (Didemnum granulatum, Didemnum molle, Didemnum psammatodes, Diplosoma listerianum, Lissoclinum fragile, Lissoclinum levitum, Lissoclinum patella, Trididemnum Cyclops) from the Didemnidae family were found and identified. Various diversity indices, such as the Shannon -Wiener index (H’), Margalef’s index (D), Pielou’s index (J’), K-dominance curves, Cluster Analysis and Multidimensional Scaling, were used to analyze the diversity, richness and evenness of species, and to compare the diversity between samples and their resemblance in terms of species composition. The maximum species richness was observed in Campbell Bay (2.424) and the minimum in Haddo Wharf (0.910). This finding shows the rich species diversity of ascidian fauna at Andaman and Nicobar Islands.

scholarly journals More pests but less pesticide applications: Ambivalent effect of landscape complexity on conservation biological control

2021 ◽  
Vol 17 (11) ◽  
pp. e1009559
Author(s):  
Patrizia Zamberletti ◽  
Khadija Sabir ◽  
Thomas Opitz ◽  
Olivier Bonnefon ◽  
Edith Gabriel ◽  
...  
Keyword(s):  
Biological Control ◽  
Landscape Structure ◽  
Agricultural Landscape ◽  
Multiple Scales ◽  
Conservation Biological Control ◽  
Agricultural Landscapes ◽  
Dispersal Ability ◽  
Natural Habitats ◽  
Linear Elements ◽  
Pest Density

In agricultural landscapes, the amount and organization of crops and semi-natural habitats (SNH) have the potential to promote a bundle of ecosystem services due to their influence on ecological community at multiple spatio-temporal scales. SNH are relatively undisturbed and are often source of complementary resources and refuges, therefore supporting more diverse and abundant natural pest enemies. However, the nexus of SNH proportion and organization with pest suppression is not trivial. It is thus crucial to understand how the behavior of pest and natural enemy species, the underlying landscape structure, and their interaction, may influence conservation biological control (CBC). Here, we develop a generative stochastic landscape model to simulate realistic agricultural landscape compositions and configurations of fields and linear elements. Generated landscapes are used as spatial support over which we simulate a spatially explicit predator-prey dynamic model. We find that increased SNH presence boosts predator populations by sustaining high predator density that regulates and keeps pest density below the pesticide application threshold. However, predator presence over all the landscape helps to stabilize the pest population by keeping it under this threshold, which tends to increase pest density at the landscape scale. In addition, the joint effect of SNH presence and predator dispersal ability among hedge and field interface results in a stronger pest regulation, which also limits pest growth. Considering properties of both fields and linear elements, such as local structure and geometric features, provides deeper insights for pest regulation; for example, hedge presence at crop field boundaries clearly strengthens CBC. Our results highlight that the integration of species behaviors and traits with landscape structure at multiple scales is necessary to provide useful insights for CBC.

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