scholarly journals Species composition of phyto-and zoo-plankton communities in fertilized and non-fertilized paddy fields.

1987 ◽  
Vol 48 (2) ◽  
pp. 77-83 ◽  
Author(s):  
Makoto TAIRA ◽  
Kinji HOGETSU
Keyword(s):  
Species Composition ◽  
Paddy Fields ◽  
Plankton Communities

Crustacean Plankton of 146 Alpine and Subalpine Lakes and Ponds in Western Canada

1971 ◽  
Vol 28 (3) ◽  
pp. 311-321 ◽  
Author(s):  
R. Stewart Anderson
Keyword(s):  
Species Composition ◽  
National Parks ◽  
Copepod Species ◽  
Physical Factors ◽  
Western Canada ◽  
Cladoceran Species ◽  
Subalpine Lakes ◽  
Crustacean Plankton ◽  
Large Predators ◽  
Plankton Communities

Investigations of crustacean plankton communities in 146 alpine and subalpine waters in some western Canadian national parks and environs showed that species composition varied little from year to year and that there was a mean of 2.93 species per community Diaptomus arcticus occurred in 60% of the communities. More cladoceran species than copepod species were found, but there were usually more copepod than cladoceran species in a community. Many of the species found in subalpine waters did not occur in alpine waters, where they were probably limited more by physical factors — such as temperature and morphometry — and the presence of large predators than by altitude. Except for anostracans, few species seemed to be restricted to either lakes or ponds in the study area. Congeneric occurrences of large cladocerans or nonpredaceous diaptomid copepods were uncommon, as were co-occurrences of large cladocerans and nonpredaceous diaptomids.

scholarly journals Effects of Human Activities on the Diversity of Waterbirds Wintering in a Shallow Lake of the Middle and Lower Yangtze River Floodplain, China

Diversity ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 302
Author(s):  
Xinjian Wang ◽  
Jinyun Chen ◽  
Lizhi Zhou
Keyword(s):  
Species Composition ◽  
Human Activity ◽  
Shallow Lakes ◽  
Shallow Lake ◽  
Yangtze River ◽  
Paddy Fields ◽  
Aquaculture Ponds ◽  
Lower Yangtze ◽  
Lake Wetlands ◽  
Wetland Habitats

Human activity is the major factor driving the wetland degradation in shallow lakes. Human exploitation of lake wetlands alters the habitats of wintering waterbirds, and, in turn, waterbird diversity in the shallow lakes. In the present study, we surveyed species composition, abundance, and habitat characteristics of waterbirds in three types of wetland habitats (natural lakeside wetlands, paddy fields, and aquaculture ponds) at Caizi Lake, a shallow lake in the middle and lower Yangtze River during the wintering period, and investigated the effects of habitat change driven by human activity on the diversity of wintering waterbirds. There were significant differences in species composition and abundance among the three wetland habitats (natural lakeside wetlands, aquaculture ponds, and artificial paddy fields); however, there were no significant differences among the habitats with respect to the number of waterbirds. The numbers of overwintering waterbird species and waterbird individuals in aquaculture ponds and lakeside wetlands were significantly higher than the numbers in the paddy fields, indicating that wintering waterbirds prefer natural lake wetlands and aquaculture ponds. Principal component analysis of the three wetland habitat types revealed that factors influencing waterbird diversity include wetland area, vegetation cover, water level, and degree of human interference. Therefore, minimizing human interference and ensuring suitable habitats at specific periods could facilitate the maintenance of waterbird diversity.

scholarly journals Estimation of River Utroya Ecological State in Intensive Organic Pollution Area Using Plankton Communities ’ Characteristics (Pskov Region)

2015 ◽  
Vol 3 ◽  
pp. 62
Author(s):  
Diana Sudnitsina ◽  
Anna Cherevichko
Keyword(s):  
Species Composition ◽  
Organic Pollution ◽  
Ecological State ◽  
River Stretch ◽  
Pskov Region ◽  
Structural Indicators ◽  
Pollution Area ◽  
Zooplankton Communities ◽  
Plankton Communities

The changes in characteristics of phytoplankton and zooplankton communities in the river Utroya stretch with the active organic pollution were discussed. The paper shows the effects of pollution on the structural indicators of the communities (species composition, abundance, and biomass). Saprobical analysis was held. Assessment of ecological state of the river stretch was made.

Norfloxacin pollution alters species composition and stability of plankton communities

2020 ◽  
Vol 385 ◽  
pp. 121625 ◽  
Author(s):  
Ying Pan ◽  
Jinyan Dong ◽  
Lingling Wan ◽  
Shucun Sun ◽  
Hugh J. MacIsaac ◽  
...  
Keyword(s):  
Species Composition ◽  
Plankton Communities

Species Composition, Distribution and Management of Trees in Rice Paddy Fields in Central Lao, PDR

2006 ◽  
Vol 67 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Y. Kosaka ◽  
S. Takeda ◽  
S. Prixar ◽  
S. Sithirajvongsa ◽  
K. Xaydala
Keyword(s):  
Species Composition ◽  
Lao Pdr ◽  
Rice Paddy ◽  
Paddy Fields ◽  
Composition Distribution ◽  
Rice Paddy Fields

scholarly journals Diversity and temporal variation of the bird community in paddy fields of Kadhiramangalam, Tamil Nadu, India

2019 ◽  
Vol 11 (10) ◽  
pp. 14279-14291
Author(s):  
Chaithra Shree Jayasimhan ◽  
Pramod Padmanabhan
Keyword(s):  
Species Composition ◽  
Community Composition ◽  
Tamil Nadu ◽  
Bird Species ◽  
Bird Community ◽  
Paddy Fields ◽  
Common Myna ◽  
Short Period ◽  
Community Data ◽  
Paddy Cultivation

Paddy, a major food crop of India, provides a variety of habitats in a short period of time and supports diverse organisms.  Paddy fields also harbour many birds with varying species composition across the different cultivation phases of paddy.  This study, conducted in the paddy fields of Kadhiramangalam, Tamil Nadu, India, recorded the bird community composition there during the various cultivation phases of paddy.  The bird community data was analysed and a total of 87 bird species were recorded from the study area belonging to 41 families and 13 orders.  The growth phase (PS 3) is the most diverse phase.  The bird composition showed a significant variation across the paddy cultivation phases with overall average dissimilarity of 71.41%.  The patterns shown by graphs of bird species composition across the paddy cultivation phases is based on guild, habitat usage and order overlap and elucidates that the change in bird community composition temporally can be attributed to the niche variability across the paddy cultivation phases.  The major species contributing to these changes observed are Black-headed Munia, Baya Weaver, Common Sandpiper, Barn Swallow, Common Myna, and Black Drongo in this region.   

scholarly journals Effects of field margins and other uncultivated fields on Orthoptera assemblages in the mountainous paddy field area of northeast Japan

2019 ◽  
Vol 29 (1) ◽  
pp. 52-64
Author(s):  
Masatoshi Takeuchi ◽  
Teruaki Irie
Keyword(s):  
Species Composition ◽  
Community Composition ◽  
Paddy Field ◽  
Habitat Heterogeneity ◽  
Forest Cover ◽  
Spatial Scales ◽  
Community Diversity ◽  
Paddy Fields ◽  
Field Margins ◽  
The Impact

To understand how farmlands help maintain biodiversity, we investigated the relationship between habitat heterogeneity and Orthoptera community composition on multiple spatial scales. First, we determined the impact of 12 environmental variables on the Orthoptera community diversity by sampling 37 quadrats in uncultivated fields over a broad spatial scale. Canonical correspondence analysis (CCA) demonstrated that environmental parameters influenced species composition. The first two canonical axes were associated with forest cover, grass (including harvested dried grass in some cases), bare or paddy fields, and plants with tall stems. Secondly, we conducted a local-scale survey of Orthoptera assemblages in an operational farm unit consisting of paddy fields, fallow fields, marginal grass fields, and secondary forests. Eleven Orthoptera species (46%) were found exclusively on specific vegetation types. Thirdly, we carried out a habitat-scale survey to elucidate the correspondence between consecutive spatial changes in vegetation and Orthoptera community composition in a paddy field and surrounding marginal fields. Even within narrower ranges, the compositional habitat heterogeneity induced changes in the dominant Orthoptera species composition. These results indicate that a high degree of habitat segregation occurs among Orthoptera species in field margins and in uncultivated fields, and that farmland management significantly affects spatial distribution of Orthoptera.

Sign in / Sign up

Export Citation Format

Share Document