Factors influencing community structure and distribution of different life-cycle categories of fishes in shallow waters of a large Australian estuary

1990 ◽  
Vol 106 (1) ◽  
pp. 25-37 ◽  
Author(s):  
N. R. Loneragan ◽  
I. C. Potter
Keyword(s):  
Community Structure ◽  
Life Cycle ◽  
Shallow Waters ◽  
Factors Influencing ◽  
Australian Estuary

Life cycle of the western school prawn, Metapenaeus dalli Racek, in a Western Australian estuary

1986 ◽  
Vol 37 (1) ◽  
pp. 95 ◽  
Author(s):  
IC Potter ◽  
JW Penn ◽  
KS Brooker
Keyword(s):  
Life Cycle ◽  
Western Australia ◽  
Sexual Maturity ◽  
Second Year Of Life ◽  
Second Year ◽  
Australian Estuary ◽  
Western Australian

The absence of marine records for M. dalli below latitude 31�S., together with data on gonadal stages and spermatophore deposition on females of this species in the Swan estuary, provide very strong indications that the western school prawn typically breeds in estuarine environments in south-western Australia. The 0 + recruits, which first appeared in samples in February, remained in the estuary during the following months and by November had reached a size suitable for exploitation. At this time they were approaching sexual maturity and were starting to move from the shallows to the deeper waters of the estuary where they remained for their second year of life. In contrast to Australian Penaeus species, M. dalli mates during the intermoult period when the shell is hard rather than immediately after moulting.

Factors influencing community structure in a South American tank bromeliad fauna

Oikos ◽  
2002 ◽  
Vol 96 (2) ◽  
pp. 225-234 ◽  
Author(s):  
Peter Armbruster ◽  
Robert A. Hutchinson ◽  
Peter Cotgreave
Keyword(s):  
Community Structure ◽  
South American ◽  
Factors Influencing ◽  
Tank Bromeliad

Factors influencing prokaryotic community structure composition in sub-surface coastal sediments

2012 ◽  
Vol 97 ◽  
pp. 141-148 ◽  
Author(s):  
Massimiliano Molari ◽  
Donato Giovannelli ◽  
Giuseppe d’Errico ◽  
Elena Manini
Keyword(s):  
Community Structure ◽  
Coastal Sediments ◽  
Prokaryotic Community ◽  
Factors Influencing

Research on Quality Evaluation System of Dynamic Alliance Based on Life-Cycle

2010 ◽  
Vol 97-101 ◽  
pp. 4355-4358 ◽  
Author(s):  
Shao Jie Zhang ◽  
Chun Li Yang
Keyword(s):  
Life Cycle ◽  
Evaluation System ◽  
Manufacturing Industry ◽  
Quality Evaluation ◽  
Quality Level ◽  
Multiple Factor Analysis ◽  
Dynamic Alliance ◽  
Factors Influencing ◽  
Exploratory Stage ◽  
Quality Evaluation System

Dynamic Alliance is becoming more and more important in manufacturing industry. Based on previous studies, a five-stage life-cycle of Dynamic Alliance is proposed in this paper. On the basis of life-cycle, taking into account both the entire life-cycle and each stage; the quality evaluation system was built. In this paper, the methods of Delphi and Multiple Factor Analysis were used to study the factors influencing the quality level at each stage, then quantitative conclusion was drew in the end. In addition, as the researches on Dynamic Alliance are still at the exploratory stage in manufacturing industry, this paper tries to provide references for further study.

scholarly journals Hydrozoan diversity on hard bottom in Kongsfjorden, Svalbard

2010 ◽  
Vol 90 (7) ◽  
pp. 1337-1352 ◽  
Author(s):  
Andrey Voronkov ◽  
Sofia D. Stepanjants ◽  
Haakon Hop
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Environmental Conditions ◽  
Depth Range ◽  
Factors Influencing ◽  
Main Factors ◽  
Abundance And Distribution ◽  
First Time

Hydroids in Kongsfjorden, Svalbard, were studied on five hard-bottom transects along gradients of environmental conditions from the glacier at the fjord's head to the fjord's mouth at depth-range 0–30 m. Hydrozoa colonies are widely distributed on rock and gravel substrata in Kongsfjorden. In general, however, hydroids are not dominant or subdominant in zoobenthic communities. The exception isSymplectoscyphus tricuspidatusvar.acuminatus, colonies of which were sometimes abundant enough to determine the community structure and characteristics of benthic diversity. Of the 23 species recorded in this study,Laomedea flexuosa,Phialella quadrataandHalecium tenellumas well as representatives of family Stylasteridae were recorded from Svalbard waters for the first time. Hydroid diversity was highest in the zoobenthic community structured by branched bryozoans. The abundance and distribution of hydroids were reduced, to some extent, in the inner part of the fjord compared to the outer fjord. Species richness of hydroids was high at shallow depths, decreased at around 15 m and then increased again to 30 m depth. Species with Low-boreal–Arctic and Panoceanic distributional ranges were the most frequently occurring species. Depth, type of background substratum and amount of silt on its surface were the main factors influencing hydroid distribution. Description of all recorded taxa distributions together with data on their habitat and associations in zoobenthic communities are presented in an Appendix.

scholarly journals Defining Moults in Migratory Birds: A Sequence-based Approach

2021 ◽  
Author(s):  
Peter Pyle
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Migratory Birds ◽  
Autumn Migration ◽  
Evolutionary Approach ◽  
Breeding Period ◽  
P System ◽  
Migratory Species ◽  
Cycle System ◽  
Factors Influencing

Two broad nomenclatures have emerged to describe moult strategies in birds, the "life-cycle" system which describes moults relative to present-day breeding and other life-history events and the Humphrey-Parkes (H-P) system which reflects the evolution of moults along ancestral lineages. Using either system, challenges have arisen defining strategies in migratory species with more than one moult per year. When all or part of two moults occur in non-breeding areas they may fail to be recognized as two moults or have been discriminated temporally, whether feathers are replaced in fall, winter, or spring. But in some cases feather replacement can span the non-breeding period, and this has resulted in an inability to identify inserted moults and to compare moult strategies between species. Furthermore, recent analyses on factors influencing the extent of the postjuvenile or preformative moults have either confined this moult to the summer grounds or presumed that it can be suspended and resumed on winter grounds, which has lead to quite divergent results. Evolutionarily, the timing, extent, and location of moults are very plastic whereas the sequence in which feathers are replaced is comparatively fixed. As, such, I propose taking an evolutionary approach to define moults on the basis of feather-replacement sequences as opposed to timing or location of replacement, including strategies in which moults can overlap temporally. I provide examples illustrating the functionality of a sequence-based definition in three migratory North American passerines that can undergo feather replacement twice in non breeding areas, and I demonstrate how this system can effectively apply to moults in many other passerine and non-passerine species. I recommend that authors studying the evolutionary drivers of moult strategies in migratory birds adopt a sequence-based approach or carefully consider replacement strategies both prior to and following autumn migration.

scholarly journals Cultivated and wild pearl millet display contrasting patterns of abundance and co-occurrence in their root mycobiome

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Marie-Thérèse Mofini ◽  
Abdala G. Diedhiou ◽  
Marie Simonin ◽  
Donald Tchouomo Dondjou ◽  
Sarah Pignoly ◽  
...  
Keyword(s):  
Community Structure ◽  
Pearl Millet ◽  
Relative Abundance ◽  
Fungal Community ◽  
Management Practices ◽  
Pennisetum Glaucum ◽  
Fungal Communities ◽  
Fungal Community Structure ◽  
The Core ◽  
Factors Influencing

AbstractFungal communities associated with roots play a key role in nutrient uptake and in mitigating the abiotic and biotic stress of their host. In this study, we characterized the roots mycobiome of wild and cultivated pearl millet [Pennisetum glaucum (L.) R. Br., synonym: Cenchrus americanus (L.) Morrone] in three agro-ecological areas of Senegal following a rainfall gradient. We hypothesized that wild pearl millet could serve as a reservoir of endophytes for cultivated pearl millet. We therefore analyzed the soil factors influencing fungal community structure and whether cultivated and wild millet shared the same fungal communities. The fungal communities associated with pearl millet were significantly structured according to sites and plant type (wild vs cultivated). Besides, soil pH and phosphorus were the main factors influencing the fungal community structure. We observed a higher fungal diversity in cultivated compared to wild pearl millet. Interestingly, we detected higher relative abundance of putative pathotrophs, especially plant pathogen, in cultivated than in wild millet in semi-arid and semi-humid zones, and higher relative abundance of saprotrophs in wild millet in arid and semi-humid zones. A network analysis based on taxa co-occurrence patterns in the core mycobiome revealed that cultivated millet and wild relatives had dissimilar groups of hub taxa. The identification of the core mycobiome and hub taxa of cultivated and wild pearl millet could be an important step in developing microbiome engineering approaches for more sustainable management practices in pearl millet agroecosystems.

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