scholarly journals Effects of exotic plants in native vegetation on species richness and abundance of birds and mammals

Pest or Guest ◽  
2007 ◽  
pp. 216-221 ◽  
Author(s):  
Brad R. Murray ◽  
Chris R. Dickman ◽  
Tessa Robson ◽  
Adele Haythornthwaite ◽  
Andrew J. Cantlay ◽  
...  
Keyword(s):  
Species Richness ◽  
Exotic Plants ◽  
Native Vegetation ◽  
Species Richness And Abundance

scholarly journals Salinity and freshwater discharge determine rotifer distribution at the Mossoró River Estuary (Semiarid Region of Brazil)

2010 ◽  
Vol 70 (3) ◽  
pp. 551-557 ◽  
Author(s):  
AMA. Medeiros ◽  
JEL. Barbosa ◽  
PR. Medeiros ◽  
RM. Rocha ◽  
LF. Silva
Keyword(s):  
Species Richness ◽  
Rainy Season ◽  
Salinity Gradient ◽  
River Estuary ◽  
Positive Influence ◽  
Freshwater Discharge ◽  
The Other ◽  
Semiarid Region ◽  
Inverse Estuary ◽  
Species Richness And Abundance

The present study aimed at evaluating differences in rotifer distribution in three estuarine zones in an inverse estuary located in the Semiarid Region of Brazil. Zones were chosen based on their proximity to the ocean and river border as a means of reflecting a horizontal salinity gradient. High freshwater discharge during the rainy season was the major determinant of rotifer composition. On the other hand, due to higher salinity values during the dry season, very low values of species richness and abundance were observed in all zones. Therefore, the study highlights the constraints of salinity and the positive influence of seasonality and river proximity on rotifer species in a semiarid estuarine environment.

scholarly journals Impact of greenspaces in city on avian species richness and abundance in Northern Africa

2017 ◽  
Vol 340 (8) ◽  
pp. 394-400
Author(s):  
Hani Amir Aouissi ◽  
Julien Gasparini ◽  
Adnène Ibrahim Belabed ◽  
Zihad Bouslama
Keyword(s):  
Species Richness ◽  
Northern Africa ◽  
Avian Species ◽  
Species Richness And Abundance

scholarly journals Insetos como Bioindicadores de Áreas Degradadas ou em Processo de Restauração no Bioma Caatinga

2021 ◽  
Vol 24 (5-esp.) ◽  
pp. 630-635
Author(s):  
Ariane Costa Agra ◽  
Welber Da Costa Pina
Keyword(s):  
Higher Education ◽  
Species Richness ◽  
Environmental Degradation ◽  
Native Vegetation ◽  
Environmental Restoration ◽  
Insect Order ◽  
Management Capacity ◽  
Caatinga Biome ◽  
Education Personnel ◽  
Regeneration Processes

O bioma Caatinga tem sofrido com grandes processos de degradação ambiental, que leva a fragmentação, perda do habitat e a uma crescente preocupação por uma restauração deste ambiente. Os insetos respondem de diferentes maneiras ao habitar gradientes sucessionais, sendo importantes na detecção de ambientes alterados. Por isso, o objetivo foi construir uma pesquisa bibliográfica acerca dos estudos desenvolvidos na Caatinga com foco na utilização dos insetos em avaliação de processos de restauração, regeneração ou sucessão de áreas degradadas neste bioma. O acesso à bibliografia foi feito eletronicamente, buscou-se por artigos científicos, no portal Google Acadêmico e de periódicos da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES, as buscas foram feitas entre 12/06/17 a 10/09/17 e em abril de 2020. As palavras chaves utilizadas foram em inglês e português e com relação ao tema proposto.  Dos 112 artigos selecionados, apenas 18 estudos foram foco da revisão. A ordem de inseto mais estudada em áreas degradadas e/ou processo de regeneração é Isoptera, seguidos pela ordem Coleoptera e Hymenoptera. Todos os estudos apontaram grupos de insetos como bioindicadores, mas os resultados sobre assembleias, composição e riqueza de espécies foram divergentes para determinados grupos. Os trabalhos são pontuais em algumas ordens de insetos, mas aparentemente estão em legítima expansão e, assim, o bioma carece urgentemente de um maior aporte de pesquisas científicas, que permitirá um maior entendimento dos processos que catalisam a regeneração da vegetação nativa e a melhoria na capacidade de manejo de áreas degradadas.   Palavras-chave: Degradação Ambiental. Insetos da Caatinga. Restauração Ambiental.   Abstract The Caatinga biome has undergone major processes of environmental degradation, which leads to fragmentation, loss of habitat and a growing concern for the restoration of this environment. Insects respond in different ways to inhabit successional gradients, being important in detecting altered environments. Therefore, the objective was to build a bibliographic research about the studies developed in the Caatinga with a focus on the use of insects in the evaluation of restoration, regeneration or succession of degraded areas in this biome. Access to the bibliography was carried out electronically, scientific articles were searched on the google academic and of periodics of the Coordination for the Improvement of Higher Education Personnel - CAPES, the searches were made between 06/12/17 to 09/10/17 and in April 2020. The keywords used were in English and Portuguese and in relation to the proposed theme. Of the 112 selected articles, only 18 studies were the focus of the review. The most studied insect order in degraded areas and / or regeneration processes is Isoptera, followed by Coleoptera and Hymenoptera. All studies pointed out groups of insects as bioindicators, but the results on assemblages, composition and species richness were divergent for certain groups. The works are punctual in some orders of insects, but it seems that they are in legitimate expansion and, thus, the biome urgently needs a greater contribution of scientific research, which will allow a greater understanding of the processes that catalyze the regeneration of native vegetation and improve the management capacity of degraded areas.  Keywords: Environmental Degradation. Caatinga Insects. Environmental Restoration.

scholarly journals Effects of cover crops on beetle assemblages in tea plantations

2021 ◽  
Author(s):  
Li-Lin Chen ◽  
Gabor Pozsgai ◽  
Xiang-Yu Li ◽  
Lei Li ◽  
Gadi V.P. Reddy ◽  
...  
Keyword(s):  
Species Richness ◽  
Pest Management ◽  
Cover Crops ◽  
Ground Cover ◽  
Paspalum Notatum ◽  
Bare Ground ◽  
Tea Plantations ◽  
Beetle Assemblages ◽  
Potential Benefits ◽  
Species Richness And Abundance

AbstractBeetles are visible members of food webs in tea plantations, with high species richness and abundance. Many tea pests, as well as natural enemies, are members of this order, so a knowledge of how groundcovers affect beetles can aid pest management. We collected beetles in a replicated field experiment in the Wuyi Mountains, Fujian Province China. Tea was intercropped with Paspalum notatum or Chamaecrista rotundifolia, or rows were cleared to bare ground, or in the control they were left unmanaged to allow weeds to grow naturally. Sampling, done by sweep netting and vegetation beating, was conducted monthly, between May 2006 and April 2008, and Coleoptera abundance, biomass, species richness and assemblage structures were compared between groundcover treatments. Total beetle abundance and species richness were significantly higher in tea intercropped with C. rotundifolia and bare ground than in naturally grown weedy control. Whilst there was no difference between predator assemblages among treatments for any measure, herbivores were more abundant, weighed more, and were more diverse in C. rotundifolia treatments than in weedy control. Biomass and species richness were also greater in plots with P. notatum groundcover than those in weedy control. We found that beetle assemblages varied both seasonally and with ground cover treatment, but the potential pest control impact of more species-rich beetle assemblages was mixed, and further work is needed to gain information on trophic groups with potential benefits for use in non-insecticidal pest management.

Spatial distribution of chaetodontid fish in coral reefs of the Ryukyu Islands, southern Japan

1999 ◽  
Vol 79 (4) ◽  
pp. 725-735 ◽  
Author(s):  
L. Cadoret ◽  
M. Adjeroud ◽  
M. Tsuchiya
Keyword(s):  
Species Richness ◽  
Coral Reefs ◽  
Reef Slope ◽  
Data Matrix ◽  
Ryukyu Islands ◽  
Southern Japan ◽  
The Ryukyu Islands ◽  
The World ◽  
Species Richness And Abundance ◽  
Reef Edge

The spatial patterns of butterflyfish assemblages (Chaetodontidae) were examined within and between five islands of the Ryukyu Archipelago, southern Japan. Despite being the northernmost reef communities in the world and despite the severe natural and human-induced disturbances that have affected them since the 1970s, the coral reefs of the Ryukyu Islands have one of the most diversified assemblages of chaetodontids in the world. A total of 30 species were identified, and species richness per island ranged from 20 to 25 species. On each of the 45 stations prospected, between four and 17 species were recorded, and between 0.75 and 21.75 ind 250 m−2 were counted. Variation in species composition, species richness and abundance between islands was less pronounced than the variation within islands, where assemblages of the major reef environments (i.e. the reef flat, the reef edge, and the reef slope) were distinguished. The highest species richness and abundance were found on the reef slope and the reef edge. Canonical correspondence analysis revealed that depth, substrate complexity, and live coral cover influenced the distribution of chaetodontid fishes. These factors accounted for 20% of the variation in the species data matrix.

Effect of indaziflam on native species in natural areas and rangeland

2019 ◽  
Vol 12 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Shannon L. Clark ◽  
Derek J. Sebastian ◽  
Scott J. Nissen ◽  
James R. Sebastian
Keyword(s):  
Species Richness ◽  
Weed Management ◽  
Native Species ◽  
Species Abundance ◽  
Unintended Consequences ◽  
Ecological Impacts ◽  
Limited Information ◽  
Perennial Species ◽  
Temporary Reduction ◽  
Species Richness And Abundance

AbstractMinimizing the negative ecological impacts of exotic plant invasions is one goal of land management. Using selective herbicides is one strategy to achieve this goal; however, the unintended consequences of this strategy are not always fully understood. The recently introduced herbicide indaziflam has a mode of action not previously used in non-crop weed management. Thus, there is limited information about the impacts of this active ingredient when applied alone or in combination with other non-crop herbicides. The objective of this research was to evaluate native species tolerance to indaziflam and imazapic applied alone and with other broadleaf herbicides. Replicated field plots were established at two locations in Colorado with a diverse mix of native forbs and grasses. Species richness and abundance were compared between the nontreated control plots and plots where indaziflam and imazapic were applied alone and in combination with picloram and aminocyclopyrachlor. Species richness and abundance did not decrease when indaziflam or imazapic were applied alone; however, species abundance was reduced by treatments containing picloram and aminocyclopyrachlor. Species richness was only impacted at one site 1 yr after treatment (YAT) by these broadleaf herbicides. Decreases in abundance were mainly due to reductions in forbs that resulted in a corresponding increase in grass cover. Our data suggest that indaziflam will control downy brome (Bromus tectorumL.) for multiple years without reduction in perennial species richness or abundance. IfB. tectorumis present with perennial broadleaf weeds requiring the addition of herbicides like picloram or aminocyclopyrachlor, forb abundance could be reduced, and in some cases there could be a temporary reduction in perennial species richness.

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