Factors influencing invertebrate drift in small forest streams, south-eastern Queensland

1995 ◽  
Vol 46 (8) ◽  
pp. 1101 ◽  
Author(s):  
BM Kerby ◽  
SE Bunn ◽  
JM Hughes
Keyword(s):  
Invertebrate Drift ◽  
Chironomid Larvae ◽  
South Eastern ◽  
Factors Influencing ◽  
Gut Fullness ◽  
Disproportionate Number ◽  
Forest Streams ◽  
Number Of Individuals ◽  
Low Drift ◽  
Small Forest

Aspects of invertebrate drift were investigated in four small rainforest streams in south-eastern Queensland. Hourly sampling in two streams revealed low drift rates and no distinct diel patterns. This may have been a consequence of the low flows experienced during the study period. The drift was dominated by Simuliidae, Chironomidae and to a lesser extent Tasmanocoenis sp. (Caenidae) and Cheumatopsyche sp. 6 (Hydropsychidae). Additional studies were undertaken to examine why some individuals of particular taxa drift while others (of the same taxa) remain in or on the substratum. Analysis of the relative gut fullness of simuliid and chironomid larvae showed that a higher proportion of non-drifting individuals had full or nearly full guts compared with those in the drift. Hungrier individuals of these two taxa may enter the drift as a food searching mechanism. An analysis of limb loss of hexapod nymphs indicated that a disproportionate number of individuals in the drift had one or more limbs missing compared with those that remained in the benthos. These data support the hypothesis that invertebrates present in the drift are less fit than non-drifters.

scholarly journals Habitat-specific production of aquatic and terrestrial invertebrate drift in small forest streams: implications for drift-feeding fish

2017 ◽  
Vol 74 (8) ◽  
pp. 1208-1217 ◽  
Author(s):  
Sean M. Naman ◽  
Jordan S. Rosenfeld ◽  
Laura C. Third ◽  
John S. Richardson
Keyword(s):  
Prey Availability ◽  
Channel Structure ◽  
Invertebrate Drift ◽  
Entry Rate ◽  
Terrestrial Invertebrates ◽  
Drift Feeding ◽  
Drift Flux ◽  
Forest Streams ◽  
Channel Unit ◽  
Small Forest

The influence of stream channel structure on the production of prey for drift-feeding fish is not well understood. We quantified drift production, the entry rate per streambed area, and drift flux, the total export rate per channel unit, in three second-order, forested streams in southwest British Columbia, Canada. We tested whether (1) drift production was higher in riffles than in pools, (2) drift flux increased with riffle length, and (3) prey body size was larger from riffles relative to pools and from terrestrial drop relative to aquatic drift. Total and aquatic-derived drift production (mg·m−2·h−1) was ∼3.5 times higher in riffles relative to pools; however, terrestrial drift did not differ between channel types. Total drift flux (mg·h−1) was positively related to riffle length. Terrestrial invertebrates were approximately three times larger than aquatics, and invertebrates from riffles were approximately three times larger on average than those from pools. These results suggest that channel structure directly affects prey availability and prey quality for drift-feeding fish and that long riffles may be key areas of prey generation.

scholarly journals The Role of Gender and Situational Factors in Wine Consumption of Generation Y

2013 ◽  
Vol 8 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Jasmina Dlačić ◽  
Selma Kadić-Maglajlić
Keyword(s):  
Eastern Europe ◽  
Generation Y ◽  
Situational Factors ◽  
Wine Consumption ◽  
South Eastern ◽  
Factors Influencing ◽  
Research Findings ◽  
South Eastern Europe ◽  
Practical Implications

Abstract The purpose of this study is to analyze the factors influencing wine consumption of Generation Y consumers in the context of two countries from South-Eastern Europe (Bosnia -Herzegovina, and Croatia). Analysis reveals that self-expression, sociability, tradition and food are significant predictors of wine consumption. Multivariate regressions have been applied in order to explain the influences of the abovementioned factors on wine consumption. Research findings show that specific gender and situational differences exist in the wine consumption behaviour of Generation Y. This paper discusses theoretical, empirical and practical implications, and offers ideas for further research

Life on the edge: the ecology and life history of the tropidurine iguanid lizard Uranoscodon superciliosum

1990 ◽  
Vol 68 (7) ◽  
pp. 1366-1373 ◽  
Author(s):  
Jeffrey M. Howland ◽  
Laurie J. Vitt ◽  
Pamela T. Lopez
Keyword(s):  
Life History ◽  
Social Interaction ◽  
Sexual Dimorphism ◽  
Small Diameter ◽  
Habitat Specialization ◽  
Large Size ◽  
Tropical Wet Forest ◽  
History Of ◽  
Forest Streams ◽  
Small Forest

An Amazonian population of the iguanid lizard Uranoscodon superciliosum was studied in lowland tropical wet forest in central Pará, Brazil. These nonheliothermic lizards are restricted to densely vegetated habitats near (often over) water, particularly riverbanks and small forest streams, where they utilize small-diameter perches and feed on a wide variety of invertebrates, apparently at the water's edge. They mature at moderate to large size at an age of about 1.5 years. Production of moderate-sized clutches of eggs is seasonal, and reproduction and fat storage both cycle in association with rainfall and flooding. Although they occur in fairly high densities, social interaction is uncommon and sexual dimorphism is not pronounced. The ecology and life history of this lizard seem to be strongly influenced by the unusual habitat specialization.

On the subsistence practices of the Shi’erqiao Culture: focused on zooarchaeology

2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Kunyu He
Keyword(s):  
Early Stage ◽  
Subsistence Strategies ◽  
Chengdu Plain ◽  
Factors Influencing ◽  
Animal Remains ◽  
Different Types ◽  
Minimum Number ◽  
Minimum Number Of Individuals ◽  
Archaeological Cultures ◽  
Number Of Individuals

AbstractThrough the analyses of the number of identified specimens (NISP), minimum number of individuals (MNI) and estimation of meat available from the animal remains unearthed from representative sites of the Chengdu Plain Type and Eastern Chongqing Type of the Shi’erqiao Culture, this paper discusses the subsistence strategy of this culture. The results show that the meat resources of the Chengdu Plain Type were mainly domesticated animals, while those of the Eastern Chongqing Type were mainly hunted animals. This paper draws the conclusion that in the early stage of human civilization, the subsistence strategies of different types of the same archaeological culture might be different, while those of different archaeological cultures might be similar; the factors influencing the subsistence strategies are mainly the natural environment, regional economic traditions, and population pressures.

1. Ageing, a brief history

2016 ◽  
pp. 1-21
Author(s):  
Nancy A. Pachana
Keyword(s):  
Life Expectancy ◽  
Developing World ◽  
Ancient World ◽  
Human Beings ◽  
Historical Trends ◽  
Factors Influencing ◽  
Number Of Individuals ◽  
Over Time

How has the construct of ageing, and attitudes towards it, changed over time? How have human beings from various historical epochs, cultures, and perspectives viewed ageing? What impact have these views about ageing had on individuals and our broader society? ‘Ageing, a brief history’ considers these questions and shows that from the ancient world to the modern there have been conflicting views on ageing. It examines historical trends in longevity and lifespan, and factors influencing life expectancy and ageing. We are now at a point in history where the number of individuals over the age of 65 will surpass those aged 5 and under, across the developed and developing world.

Morphological traits and vertical distribution of hyporheic chironomid larvae in Atlantic Forest streams

2019 ◽  
Vol 32 (3) ◽  
pp. 119-134
Author(s):  
Riccardo Mugnai ◽  
Arlindo Serpa-Filho ◽  
Jorge Luiz Nessimian ◽  
Adriano Brilhante Kury ◽  
Silvia Vendruscolo Milesi
Keyword(s):  
Vertical Distribution ◽  
Atlantic Forest ◽  
Morphological Traits ◽  
Chironomid Larvae ◽  
Forest Streams

scholarly journals Factors Influencing The Use Of Episiotomy During Vaginal Delivery In South Eastern Nigeria

2008 ◽  
Vol 85 (5) ◽  
Author(s):  
B Chigbu ◽  
S Onwere ◽  
C Aluka ◽  
C Kamanu ◽  
E Adibe
Keyword(s):  
Vaginal Delivery ◽  
South Eastern ◽  
Factors Influencing

Brachyuran crabs (Decapoda, Brachyura) associated with the green sponge Amphimedon viridis (Demospongiae) from Itaguá Beach, south-eastern coast of Brazil

Crustaceana ◽  
2012 ◽  
Vol 85 (4-5) ◽  
pp. 497-512 ◽  
Author(s):  
Douglas F. R. Alves ◽  
Marcelo C. R. Carvalho ◽  
Samara De P. Barros-Alves ◽  
Valter J. Cobo
Keyword(s):  
Eastern Coast ◽  
Biological Parameters ◽  
The South ◽  
Volume Number ◽  
South Eastern ◽  
Species Recruitment ◽  
Brachyuran Crabs ◽  
Number Of Individuals ◽  
Rocky Bottoms ◽  
Over Time

This study provides information on the community structure of brachyuran crabs associated with the green sponge, Amphimedon viridis Duchassaing & Michelotti, 1864, from a beach on the south-eastern coast of Brazil. Monthly collections from May 2002 through August 2003 were carried out on the rocky bottoms off Itaguá Beach (23°27′07″S 45°02′49″W). Crabs on the green sponge banks were hand-caught during snorkelling sessions, and 638 crabs belonging to 31 species, 19 genera, and 10 families were obtained. Biological parameters, including sponge volume, number of individuals, density, richness, diversity, evenness, and dominance changed considerably over time. Species recruitment and foraging habit are some of the factors that drive the richness, dominance, and diversity patterns of this community. The green sponge banks are important sites for recruitment, refuge, and feeding of many species of brachyurans. Therefore, they are also important for the conservation of this group on the south-eastern coast of Brazil.

scholarly journals Impact of resistance to fenitrotion and esfenvalerate on the control of Rhyzopertha dominica (Coleoptera: Bostrichidae) in stored wheat

2020 ◽  
Vol 46 (2) ◽  
pp. e7612
Author(s):  
Javier Alberto Vásquez-Castro ◽  
Gilberto Casadei De Baptista ◽  
Casimiro Dias Gadanha Jr. ◽  
Julio Cesar Bracho-Pérez
Keyword(s):  
Rhyzopertha Dominica ◽  
Application System ◽  
Stored Wheat ◽  
Control Programs ◽  
Insecticidal Effect ◽  
Factors Influencing ◽  
Number Of Individuals ◽  
Residual Action ◽  
Brazilian Populations

Insecticides resistance can significantly compromise the control programs of Rhyzopertha dominica (Coleoptera: Bostrichidae), one of the main wheat pests in warehouses. The objectives of this work were to study the occurrence of resistance to fenitrothion and esfenvalerate in two Brazilian populations of R. dominica from Santa Rosa (SR lineage) and Campo Grande (CG lineage), as well as the insecticidal effect and residual action of these insecticides when used alone or as a mixture in stored wheat. The application system was calibrated to provide grain treatment at theoretical concentrations of 10 and/or 0.5 mg kg-1 fenitrothion and esfenvalerate, respectively. By comparing the fitted mortality curves for lineages within insecticides, as well as insecticides within lineages significant differences were observed in all cases. Esfenvalerate was ineffective in controlling R. dominica. The SR lineage of R. dominica was more resistant to the insecticides tested than the CG lineage. The number of individuals in the F1 offspring of R. dominica was dependent on the lineage, insecticide, and on the time after the application of insecticide. In the untreated grains (control), the CG lineage had a greater number of progeny than the SR lineage, while the opposite was verified in the grains treated. Fenitrothion and esfenvalerate are not useful for the control of R. dominica. Factors influencing control of R. dominica are discussed in this work.

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