Drivers of species richness and abundance of marine macrophytes on shallow tropical reefs of north‐western Australia

2018 ◽  
Author(s):  
Ylva S. Olsen ◽  
Lydiane Mattio ◽  
Andrea Zavala Perez ◽  
Russ C. Babcock ◽  
Damian Thompson ◽  
...  
Keyword(s):  
Species Richness ◽  
Western Australia ◽  
Tropical Reefs ◽  
Marine Macrophytes ◽  
Species Richness And Abundance ◽  
North Western

Corrigendum to: Impacts of level of utilisation by grazing on an Astrebla (Mitchell grass) grassland in north-western Queensland between 1984 and 2010. 2. Plant species richness and abundance

2014 ◽  
Vol 36 (3) ◽  
pp. 309
Author(s):  
D. M. Orr ◽  
D. G. Phelps
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Plant Species Richness ◽  
Seasonal Rainfall ◽  
Yearly Variation ◽  
Rainfall Variation ◽  
Species Richness And Abundance ◽  
North Western ◽  
Sampling Times

The occurrence of interstitial species in Astrebla grasslands in Australia are influenced by grazing and seasonal rainfall but the interactions of these two influences are complex. This paper describes three studies aimed at determining and explaining the changes in plant species richness and abundance of the interstitial species in a long-term sheep utilisation experiment in an Astrebla grassland in northern Queensland. In the first study, increasing utilisation increased the frequency of Dactyloctenium radulans (Button grass) and Brachyachne convergens (Downs couch) and reduced that of Streptoglossa adscendens (Mint bush). In the second study, seasonal rainfall variation between 1984 and 2009 resulted in large annual differences in the size of the seed banks of many species, but increasing utilisation consistently reduced the seed bank of species such as Astrebla spp. and S. adscendens and increased that of species such as B. convergens, D. radulans, Amaranthus mitchellii (Boggabri) and Boerhavia sp. (Tar vine). In the third study, the highest species richness occurred at the lightest utilisation because of the presence of a range of palatable forbs, especially legumes. Species richness was reduced as utilisation increased. Species richness in the grazing exclosure was low and similar to that at the heaviest utilisation where there was a reduction in the presence of palatable forb species. The pattern of highest species richness at the lightest grazing treatment was maintained across three sampling times, even with different amounts of seasonal rainfall, but there was a large yearly variation in both the density and frequency of many species. It was concluded that the maintenance of highest species richness at the lightest utilisation was not aligned with other data from this grazing experiment which indicated that the maximum sustainable wool production occurred at moderate utilisation.

Impacts of level of utilisation by grazing on an Astrebla (Mitchell grass) grassland in north-western Queensland between 1984 and 2010. 2. Plant species richness and abundance

2013 ◽  
Vol 35 (1) ◽  
pp. 17 ◽  
Author(s):  
D. M. Orr ◽  
D. G. Phelps
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Plant Species Richness ◽  
Seasonal Rainfall ◽  
Yearly Variation ◽  
Rainfall Variation ◽  
Species Richness And Abundance ◽  
North Western ◽  
Sampling Times

The occurrence of interstitial species in Astrebla grasslands in Australia are influenced by grazing and seasonal rainfall but the interactions of these two influences are complex. This paper describes three studies aimed at determining and explaining the changes in plant species richness and abundance of the interstitial species in a long-term sheep utilisation experiment in an Astrebla grassland in northern Queensland. In the first study, increasing utilisation increased the frequency of Dactyloctenium radulans (Button grass) and Brachyachne convergens (Downs couch) and reduced that of Streptoglossa adscendens (Mint bush). In the second study, seasonal rainfall variation between 1984 and 2009 resulted in large annual differences in the size of the seed banks of many species, but increasing utilisation consistently reduced the seed bank of species such as Astrebla spp. and S. adscendens and increased that of species such as B. convergens, D. radulans, Amaranthus mitchellii (Boggabri) and Boerhavia sp. (Tar vine). In the third study, the highest species richness occurred at the lightest utilisation because of the presence of a range of palatable forbs, especially legumes. Species richness was reduced as utilisation increased. Species richness in the grazing exclosure was low and similar to that at the heaviest utilisation where there was a reduction in the presence of palatable forb species. The pattern of highest species richness at the lightest grazing treatment was maintained across three sampling times, even with different amounts of seasonal rainfall, but there was a large yearly variation in both the density and frequency of many species. It was concluded that the maintenance of highest species richness at the lightest utilisation was not aligned with other data from this grazing experiment which indicated that the maximum sustainable wool production occurred at moderate utilisation.

scholarly journals Large‐scale eDNA metabarcoding survey reveals marine biogeographic break and transitions over tropical north‐western Australia

2021 ◽  
Author(s):  
Katrina West ◽  
Michael J. Travers ◽  
Michael Stat ◽  
Euan S. Harvey ◽  
Zoe T. Richards ◽  
...  
Keyword(s):  
Western Australia ◽  
Large Scale ◽  
North Western

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

Bysmatrum teres sp. nov., a new sand-dwelling dinoflagellate from north-western Australia

Phycologia ◽  
2006 ◽  
Vol 45 (2) ◽  
pp. 161-167 ◽  
Author(s):  
Shauna Murray ◽  
Mona Hoppenrath ◽  
Jacob Larsen ◽  
David J. Patterson
Keyword(s):  
Western Australia ◽  
North Western
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