Distribution, biomass and community structure of demersal fishes of the Gulf of Carpentaria, Australia

1994 ◽  
Vol 45 (3) ◽  
pp. 375 ◽  
Author(s):  
SJM Blaber ◽  
DT Brewer ◽  
AN Harris
Keyword(s):  
Community Structure ◽  
Abiotic Factors ◽  
Fish Fauna ◽  
Distribution Patterns ◽  
Demersal Fish ◽  
Fish Distribution ◽  
Sediment Type ◽  
Principal Coordinates Analysis ◽  
Main Site ◽  
Principal Coordinates

The demersal fish fauna of the Gulf of Carpentaria was surveyed during November and December 1990. Over 300 species from 85 families were caught by trawling a systematic grid of 107 stations. The absolute mean biomass was 124.8 kg ha-1 (s.e. =44.1) for day trawls and 53.7 kg ha-1 (s.e. =6.0) for night trawls. The overall mean catch rates were 421.3 kg h-1 (s.e. = 128.5) for day trawls and 198.6 kg h-1 (s.e. =21.5) for night trawls. Biomasses were twice as high in the prawn-trawling grounds of Albatross Bay, the south-eastern gulf and Groote Eylandt as they were elsewhere in the gulf. Twenty-five species made up 75% of the biomass; the dominant families were Haemulidae, Carangidae, Leiognathidae and Nemipteridae. Community-structure and distribution patterns were analysed by numerical classification techniques and principal-coordinates analysis. These indicated six main site groups and 15 fish community groups, based on fish species occurrences and biomasses. There was a relationship between fish distribution patterns and depth of water but not other abiotic factors recorded (sediment type, salinity, temperature and turbidity).

Diversity, relative abundance, new locality records, and updated fish fauna of the Ross Sea region

2013 ◽  
Vol 25 (5) ◽  
pp. 619-636 ◽  
Author(s):  
Stuart M. Hanchet ◽  
Andrew L. Stewart ◽  
Peter J. McMillan ◽  
Malcolm R. Clark ◽  
Richard L. O'Driscoll ◽  
...  
Keyword(s):  
Ross Sea ◽  
Fish Fauna ◽  
Demersal Fish ◽  
Fish Distribution ◽  
Distribution Data ◽  
Mesopelagic Fish ◽  
Species List ◽  
The North ◽  
Evenness Indices ◽  
Total Species

AbstractTwo surveys were carried out in the Ross Sea region during February and March 2004 and 2008 from the New Zealand RVTangaroa. Fishes were sampled on the continental shelf and slope of the Ross Sea, and on adjacent seamounts to the north, mainly using a large demersal fish trawl and a large mesopelagic fish trawl. Parts of the shelf and slope were stratified by depth and at least three random demersal trawls were completed in each stratum, enabling biomass estimates of demersal fish to be calculated. Fish distribution data from these two surveys were supplemented by collections made by observers from the toothfish fishery. A diverse collection of over 2500 fish specimens was obtained from the two surveys representing 110 species in 21 families. When combined with previous documented material this gave a total species list of 175, of which 135 were from the Ross Sea shelf and slope (to the 2000 m isobath). Demersal species-richness, diversity and evenness indices all decreased going from the shelf to the slope and the seamounts. In contrast, indices for pelagic species were similar for the slope and seamounts/abyss but were much lower for the shelf.

scholarly journals Edge effect on carabid assemblages along forest-grass transects

Web Ecology ◽  
2001 ◽  
Vol 2 (1) ◽  
pp. 7-13 ◽  
Author(s):  
T. Magura ◽  
B. Tóthmérész ◽  
T. Molnár
Keyword(s):  
Edge Effect ◽  
Abiotic Factors ◽  
Canopy Cover ◽  
Distinct Species ◽  
Forest Edge ◽  
Principal Coordinates Analysis ◽  
Forest Interior ◽  
Principal Coordinates ◽  
Significant Edge ◽  
Characteristic Species

Abstract. During 1997 and 1998, we have tested the edge-effect for carabids along oak-hornbeam forest-grass transects using pitfall traps in Hungary. Our hypothesis was that the diversity of carabids will be higher in the forest edge than in the forest interior. We also focused on the characteristic species of the habitats along the transects and the relationships between their distribution and the biotic and abiotic factors. Our results proved that there was a significant edge effect on the studied carabid communities: the Shannon diversity increased significantly along the transects from the forest towards the grass. The diversity of the carabids were significantly higher in the forest edge and in the grass than in the forest interior. The carabids of the forest, the forest edge and the grass are separated from each other by principal coordinates analysis and by indicator species analysis (IndVal), suggesting that each of the three habitats has a distinct species assemblages. There were 5 distinctive groups of carabids: 1) habitat generalists, 2) forest generalists, 3) species of the open area, 4) forest edge species, and 5) forest specialists. It was demonstrated by multiple regression analyses, that the relative air moisture, temperature of the ground, the cover of leaf litter, herbs, shrubs and canopy cover, abundance of the carabids’ preys are the most important factors determining the diversity and spatial pattern of carabids along the studied transects.

scholarly journals INFLUÊNCIA DOS FORÓFITOS Dicksonia sellowiana e Araucaria angustifolia SOBRE A COMUNIDADE DE EPÍFITOS VASCULARES EM FLORESTA COM ARAUCÁRIA

FLORESTA ◽  
2015 ◽  
Vol 45 (4) ◽  
pp. 781 ◽  
Author(s):  
Diego Fedrizzi Petry Becker ◽  
Andressa Müller ◽  
Jairo Lizandro Schmitt
Keyword(s):  
Community Structure ◽  
Araucaria Angustifolia ◽  
Principal Coordinates Analysis ◽  
Araucaria Forest ◽  
Vascular Epiphytes ◽  
Principal Coordinates ◽  
Tree Ferns ◽  
Conifer Tree ◽  
Ombrophilous Forest ◽  
Epiphyte Community

Foi verificada a influência da umidade e do pH do substrato de Araucaria angustifolia (Bertol.) Kuntze e de Dicksonia sellowiana Hook. sobre a riqueza, composição e estrutura comunitária dos epífitos vasculares no interior da Floresta Ombrófila Mista. Para o estudo da comunidade epifítica foram selecionados 20 forófitos de A. angustifolia e de D. sellowiana, inseridos em um hectare de Floresta Ombrófila Mista. Os forófitos foram divididos igualmente em quatro intervalos de um metro de altura cada. A. angustifolia apresentou 20 espécies, enquanto que D. sellowiana 11. A média de espécies por forófito foi significativamente maior em D. sellowiana que em A. angustifolia. Os valores de umidade e pH diferiram estatisticamente entre os tipos forofíticos e a maior relação foi observada entre umidade e riqueza de samambaias epifíticas. A análise de coordenadas principais evidenciou agrupamentos bem definidos para os tipos forofíticos e heterogeneidade florística entre os intervalos de altura. Blechnum acutum (Desv.) Mett. ocupou ambos os forófitos e apresentou os maiores valores de importância, demonstrando alta tolerância ecológica. Os resultados indicam que a umidade foi o fator que apresentou maior influência na estrutura da comunidade epifítica, especialmente para as samambaias.AbstractDicksonia sellowiana and Araucaria angustifolia phorophyte influence on the vascular epiphyte community in Araucaria Forest. We analyzed the influence of moisture and pH substrate of Araucaria angustifolia (Bertol.) Kuntze e Dicksonia sellowiana Hook. on the richness, composition and community structure of vascular epiphytes within the Araucaria Forest. In order to study the epiphytic community, 20 phorophytes of A. angustifolia and D. sellowiana were selected in one hectare of Araucaria Forest. The phorophytes were divided equally into four intervals of one meter each. Araucaria angustifolia showed 20 species, while D. sellowiana 11. Means of species per host tree were significantly higher in D. sellowiana than for A. angustifolia. The moisture and pH of phorophyte types differ statistically and the most relation was observed between moisture and epiphytic ferns richness. Principal coordinates analysis showed well-defined groupings for phorophyte types and floristic heterogeneity among height intervals. Blechnum acutum (Desv.) Mett. occupied both phorophytes and had the highest importance values, demonstrating high ecological tolerance. The results show that moisture was the factor with the highest influence in the epiphytic community structure, especially for the ferns.Keywords: Epiphytism; Mixed Ombrophilous Forest; conifer; tree ferns.

scholarly journals Comparative Analysis of Gut Microbiota in Captive and Wild Oriental White Storks: Implications for Conservation Biology

2021 ◽  
Vol 12 ◽  
Author(s):  
Hong Wu ◽  
Fang-Ting Wu ◽  
Qi-Hai Zhou ◽  
Da-Peng Zhao
Keyword(s):  
Community Structure ◽  
Comparative Analysis ◽  
Gut Microbiota ◽  
Species Composition ◽  
Illumina Miseq ◽  
Rrna Gene ◽  
Principal Coordinates Analysis ◽  
Principal Coordinates ◽  
Α Diversity ◽  
White Storks

The oriental white stork (Ciconia boyciana) is considered an endangered species based on the International Union for Conservation of Nature (IUCN) Red List. This study presents the first evidence on comparative analysis of gut microbial diversity of C. boyciana from various breeding conditions. To determine the species composition and community structure of the gut microbiota, 24 fecal samples from Tianjin Zoo and Tianjin Qilihai Wetland were characterized by sequencing 16S rRNA gene amplicons using the Illumina MiSeq platform. Firmicutes was found to be the predominant phylum. Analysis of community structure revealed significant differences in the species diversity and richness between the populations of the two breeding conditions. The greatest α-diversity was found in wild C. boyciana, while artificial breeding storks from Tianjin Zoo had the least α-diversity. Principal coordinates analysis showed that the microbial communities were different between the two studied groups. In conclusion, this study reveals the species composition and structure of the gut microbiota of oriental white storks under two breeding conditions, and our findings could contribute to the integrative conservation of this endangered bird.

scholarly journals Environmental Determinants Influencing Fish Community Structure and Diversity in Two Distinct Seasons among Wetlands of Northern Region (Ghana)

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Collins Ayine Nsor ◽  
Edward Adzesiwor Obodai
Keyword(s):  
Community Structure ◽  
Fish Community ◽  
Nitrate Nitrogen ◽  
Grazing Intensity ◽  
Distribution Patterns ◽  
Northern Region ◽  
Fish Distribution ◽  
Fish Diversity ◽  
Fish Community Structure ◽  
Dca Ordination

Fish community structure was assessed in six wetlands using cast nets, to correlate with environmental variables with diversity and distribution patterns, from 2010 to 2012. A total of 2,239 individuals belonging to 44 species and 1,938 individuals belonging to 40 species were sampled in the dry and wet seasons. Mochokid and Mormyrid families dominated fish community and constituted 14.8%, respectively, followed by Alestids (12.9%) and Chlariids (11.1%). Rarer taxons were centropomids, channids, malapteruds, and oesteoglossids and represented 1.9%, respectively. Overall, CPUE per net did not vary significantly (Tukey HSD test,p=0.27) in the dry and wet seasons. Wuntori marsh consistently showed dominance in mean monthly CPUE per net (dry =115±4.5; wet =107±7.7seasons), while Bunglung constructed wetland was the least recorded (dry =56.5±6.2; wet =58.3±4.1seasons). Fish diversity and richness differed significantly (F=0.11,p=0.03) among seasons. Environmental disturbances were season-specific and did not differ significantly (F=0.16,df=14,p=0.97) among sites. A DCA ordination explained 69% variability in fish distribution patterns, while PCA showed that 81.8% of nitrate-nitrogen, phosphate, and grazing intensity on axis 1 and conductivity, temperature, and turbidity on axis 2 influenced fish community structure. Wetland conservation must be promoted to sustain fish abundance and overall ecosystem stability.

Demersal fish and cephalopod communities of an unexploited coastal environment in northern Australia

1982 ◽  
Vol 33 (6) ◽  
pp. 1039 ◽  
Author(s):  
SF Rainer ◽  
ISR Munro
Keyword(s):  
Distribution Patterns ◽  
Demersal Fish ◽  
Common Species ◽  
Tropical Fish ◽  
Distribution Data ◽  
Sediment Type ◽  
Physical Factors ◽  
Trawl Fishery ◽  
Bottom Depth ◽  
Trawl Fisheries

Fish communities in the south-eastern Gulf of Carpentaria were surveyed before the development of a demersal trawl fishery for prawns. Distribution data for fish and cephalopods were examined to determine community composition and species-distribution patterns in an unexploited shallow-water tropical fish community. Common species were mostly Indo-west Pacific in affinity, and included many species important in demersal trawl fisheries. Three clusters of site groups were present, comprising site groups from nearshore (~2-5 m), shallow offshore, and deep offshore (~15-35 m) areas, respectively. Site groups did not correspond to clearly defined communities. Species overlaps were frequent. Limits to the distribution of common species seemed to be related more to physical factors (bottom depth, salinity and sediment type) than to other biotic factors (distribution of species). The overall picture was of a rich assemblage of fish species in an environment characterized by gradients rather than by sharp changes.

scholarly journals Genetic Structure and Eco-Geographical Differentiation of Wild Sheep Fescue (Festuca ovina L.) in Xinjiang, Northwest China

2017 ◽  
Author(s):  
Chenglin Zhang ◽  
Jianbo Zhang ◽  
Yan Fan ◽  
Ming Sun ◽  
Wendan Wu ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Abiotic Factors ◽  
Northwest China ◽  
Group Method ◽  
Principal Coordinates Analysis ◽  
High Genetic Diversity ◽  
Festuca Ovina ◽  
Principal Coordinates ◽  
Genetic Diversity And Structure

Glaciation and mountain orogeny have generated new ecologic opportunities for plants, favoring an increase in the speciation rate. Moreover, they also act as corridors or barriers for plant lineages and populations. High genetic diversity ensures that species are able to survive and adapt. Gene flow is one of the most important determinants of the genetic diversity and structure of out-crossed species, and it is easily affected by biotic and abiotic factors. The aim of this study was to characterize the genetic diversity and structure of an alpine species, Festuca ovina L., in Xingjiang, China. A total of 100 individuals from 10 populations were analyzed using six amplified fragment length polymorphism (AFLP) primer pairs. A total of 583 clear bands were generated, of which 392 were polymorphic; thus, the percentage of polymorphic bands (PPB) was 67.24%. The total and average genetic diversities were 0.2722 and 0.2006 (0.1686-0.2225), respectively. The unweighted group method with arithmetic mean (UPGMA) tree, principal coordinates analysis (PCoA) and STRUCTURE analyses revealed that these populations or individuals could be clustered into two groups. The analysis of molecular variance analysis (AMOVA) suggested that most of the genetic variance existed within a population, and the genetic differentiation (Fst) among populations was 20.71%. The Shannon differentiation coefficient (G’st) among populations was 0.2350. Limited gene flow (Nm = 0.9571) was detected across all sampling sites. The Fst and Nm presented at different levels under the genetic barriers due to fragmentation. The population genetic diversity was significant relative to environmental factors such as temperature, altitude and precipitation.

Distribution patterns of the demersal fish fauna on the inner continental shelf of Suriname

2015 ◽  
Vol 2 ◽  
pp. 177-188 ◽  
Author(s):  
Tomas Willems ◽  
Annelies De Backer ◽  
Jan H. Mol ◽  
Magda Vincx ◽  
Kris Hostens
Keyword(s):  
Continental Shelf ◽  
Fish Fauna ◽  
Distribution Patterns ◽  
Demersal Fish ◽  
Inner Continental Shelf

scholarly journals Distribution of blue-green algae (Cyanophyta) in streams of Mt. Stara planina: Serbia

2002 ◽  
Vol 54 (3-4) ◽  
pp. 141-148
Author(s):  
Snezana Simic
Keyword(s):  
Green Algae ◽  
Flow Rate ◽  
Current Flow ◽  
Abiotic Factors ◽  
Principal Coordinates Analysis ◽  
Bottom Type ◽  
Blue Green Algae ◽  
Principal Coordinates ◽  
First Time ◽  
Tolypothrix Distorta

Distribution of blue-green algae was studied at 14 sites along five streams in the Stara Planina mountains. Algological samples were taken from the community of benthos and periphyton in the spring (March-May 1991), summer (June-August 1991, August 1996, July 1997), and autumn (September-November 1991, September 1997). Algae of the classes Chamaesiphonophyceae (species of the genus Chamaesiphon) and Hormogoniophyceae (species of the genera Symploca, Phormidium, Oscillatoria, Schizothrix, Nostoc, Rivularia Homoeothrix, Tolypothrix, and Plectonema) were recorded. The species Chamaesiphon cylindricus, Symploca radians, Phormidium coutinhoi, Nostoc coeruleum, Homoeothrix janthina, Plectonema thomasinianum, and Tolypothrix distorta were registered herein first time in Serbia. Occurrence of blue-green algae in highland brooks and rivers of the Stara Planina mountains was monitored in relation to a large number of abiotic factors e.g. altitude above level, stream dimensions (width and depth), substrate bottom type (%), current flow rate, water temperature and pH oxygen concentration, concentrations of nitrates and phosphates, and BOD5, using Principal Coordinates analysis (PCX)).

Sign in / Sign up

Export Citation Format

Share Document