Seasonal variation in algal species richness and abundance in the presence of molluscan herbivores on a tropical rocky shore

1993 ◽  
Vol 167 (2) ◽  
pp. 261-275 ◽  
Author(s):  
Gray A. Williams
Keyword(s):  
Species Richness ◽  
Seasonal Variation ◽  
Rocky Shore ◽  
Algal Species ◽  
Species Richness And Abundance

scholarly journals Species richness and abundance of monogonont rotifers in relation to environmental factors in the UNESCO Sakaerat Biosphere Reserve, Thailand

2019 ◽  
Vol 11 (9) ◽  
pp. 14087-14100
Author(s):  
Nattaporn Plangklang ◽  
Chaichat Boonyanusith ◽  
Sujeephon Athibai
Keyword(s):  
Species Richness ◽  
Seasonal Variation ◽  
Aquatic Ecosystems ◽  
Physicochemical Parameters ◽  
Biosphere Reserve ◽  
Terrestrial Habitats ◽  
Monogonont Rotifers ◽  
Species Richness And Abundance ◽  
Total Species ◽  
Incomplete Picture

 The UNESCO Sakaerat Biosphere Reserve plays an important role in nature conservation and environmental protection.  Previous focus on terrestrial habitats and neglect of aquatic ecosystems has resulted in an incomplete picture of biodiversity of the area.  Based on the first investigation of planktonic diversity, rotifers were collected seasonally at five localities from September 2013 to May 2014 using a Schindler-Patalas plankton trap and a plankton net.  Fifteen families, 25 genera and 71 species of rotifers were identified.  The most diverse families were Lecanidae, Brachionidae, Lepadellidae, and Trichocercidae, accounting for 80% of the total species count.  The maximum species richness was reported at the reservoir, with 57 species (80% of the total), while the minimum species richness (34) was observed at the ponds.  The rainy season had the highest density, followed by winter and summer, with 149.15 N/l from an intermittent stream, and 95.43 and 50.68 N/l from a pond, respectively.  Most of the sampling sites at the three seasonal occasions were dominated by a planktonic species Polyarthra vulgaris.  The results indicate that the seasonal variation of the rotifer assemblage is related to the seasonal variation of physicochemical parameters. 

scholarly journals Seasonal variation in species richness and abundance of waterbirds in Mole National Park, Ghana: Implication for conservation and ecotourism

Koedoe ◽  
2018 ◽  
Vol 60 (1) ◽  
Author(s):  
Timothy K. Aikins ◽  
Francis Gbogbo ◽  
Erasmus H. Owusu
Keyword(s):  
Species Richness ◽  
Seasonal Variation ◽  
National Park ◽  
Dry Season ◽  
Wet Season ◽  
Bird Abundance ◽  
Number Of Species ◽  
Waterbird Species ◽  
Significant Difference ◽  
Species Richness And Abundance

Mole National Park is the largest and the oldest national park in Ghana and an important bird area, yet its waterbird fauna is poorly documented because it is situated in the northern ecological zone far away from the coast of Ghana. Information on the seasonal variation in the park’s bird abundance and diversity is generally patchy but necessary for effective birdwatching planning and management of the park’s birds. Therefore, as a guide to potential ecotourists interested in waterbirds, this study described the seasonal variation in waterbird species diversity and abundance at Mole National Park. As waterbirds mostly congregate around open wetlands and their abundance is more appropriately determined by counting all individuals in the congregant, data were collected using the total area count of waterbirds from August 2015 to October 2015 (the wet season) and from December 2015 to February 2016 (the dry season). Secondary data on arrival of tourists in the park were also analysed. The park’s waterbird species richness was 29 in the dry season compared to 18 in the wet season. There was significant difference (p < 0.05) in the abundance of waterbirds in the dry season in which 4014 waterbirds were encountered compared to 646 in the wet season. The yearly tourist arrival data at Mole National Park shows an increasing trend with peak visitation period occurring during the wet season. The chances of tourists encountering more species and numbers of waterbirds in the park are higher in the dry season compared to the wet season.Conservation implications: Species richness and abundance of waterbirds in Mole National Park varied according to the wet and dry seasons with both the number of species and abundance higher in the dry season than the wet season. It is therefore indicative that most birdwatchers who visit the park in the wet season miss out on a number of species and numbers of waterbirds. To achieve effective birdwatching, management should schedule birdwatching activities to coincide with the dry season as the chances of encountering more species and numbers of waterbirds are higher.

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 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.

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