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Population Density (0):
Recent article
Population Density
Abstract
The mussel Mytilus galloprovincialis is a common aquaculture species, and also a major fouling organism that has negative economic impacts. There are no standard assay conditions for this important species and therefore, this study quantified the effect of key factors on the settlement of pediveliger...
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PMID: 21827335
PDF is available here.
PDF is available here.
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Abstract
The mussel Mytilus galloprovincialis is a common aquaculture species, and also a major fouling organism that has negative economic impacts. There are no standard assay conditions for this important species and therefore, this study quantified the effect of key factors on the settlement of pediveliger...
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PMID: 21827335
PDF is available here.
PDF is available here.
Scientific American (305)3 2011
Abstract
Scientific American (305)3 2011
Abstract
Scientific American (305)3 2011
Abstract
Abstract
We applied capture-mark-recapture analysis to 25 years of monthly trapping data from a fluctuating prairie vole Microtus ochrogaster population in Illinois, USA, to estimate realized population growth rates and associated vital rates (survival and recruitment) and modeled them as a function of vole...
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PMID: 21905434
PDF is available here.
PDF is available here.
Abstract
Mosquito were surveyed (Nov. 2009 - March 2010) in El Ismailia Governorate. Nine species were reported: Culex pipiens, Cx. perexiguus, Cx. antennatus, Anopheles tenebrosus, An. pharoensis, An. multicolor, Ochlerotatus detritus, Oc. caspius and Culiseta longiareolata. Culex pipiens wa...
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PMID: 21980773
PDF is available here.
PDF is available here.
Abstract
The introduction of pathogens into populations of animals with no previous exposure to them and, therefore, no immunologic protection, can result in epizootics. Predicting the susceptibility of populations to infectious diseases is crucial for their conservation and management. Australian fur seals (...
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PMID: 21719820
PDF is available here.
PDF is available here.
Abstract
We performed laboratory studies to determine whether a T. infestans nymph that comes into contact with a deltamethrin-treated surface horizontally transfers the insecticide to subsequent triatomines. We found that a triatomine that walks on a deltamethrin-treated surface for a short period of time h...
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PMID: 21845956
PDF is available here.
PDF is available here.
Abstract
The decision-making processes used for out-of-hospital trauma triage and hospital selection in regionalized trauma systems remain poorly understood. The objective of this study was to assess the process of field triage decision making in an established trauma system.
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PMID: 21817971
PDF is available here.
PDF is available here.
Abstract
Abstract
The poplar petiolegall aphid, Pemphigus populitransversus Riley (Hemiptera: Pemphigidae), is a gall-forming aphid attacking leaf petioles of Populus spp., its primary hosts. Its secondary hosts are the roots of cruciferous (Brassicaceae) plants, where it is also commonly known as the "cabbage root ap...
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PMID: 21735937
PDF is available here.
PDF is available here.
Abstract
We demonstrate that Nicaraguan cabbage (Brassica spp.) farmers may suffer economically by using insecticides as they get more damage by the main pest diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae), at the same time as they spend economic resources on insecticides. Replicated s...
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PMID: 21735894
PDF is available here.
PDF is available here.
Abstract
Healthy hemlock trees, Tsuga canadensis (L.) Carrière, and hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), populations should favor retention and population growth of adelgid predators such as Laricobius nigrinus Fender (Coleoptera: Derodontidae) and Sasajiscymnus tsugae (Sasaj...
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PMID: 21735906
PDF is available here.
PDF is available here.
Abstract
The banana aphid, Pentalonia nigronervosa Coquerel (Hemiptera: Aphididae), is the most economically important pest of banana (Musa spp.) fields in Hawaii. Recently, there has been a concerted effort in Hawaii to learn more about the biology and ecology of this pest. However, limited work has been dir...
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PMID: 21735915
PDF is available here.
PDF is available here.
Abstract
Hull split date, shell seal, and navel orangeworm, Amyelois transitella (Walker) (Lepidoptera: Pyralidae), infestation data for 19 varieties of almonds, Prunus dulcis (Mill.) D.A. Webb, were analyzed to determine the relationship of shell seal and hull split date on A. transitella infestation. Data f...
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PMID: 21735917
PDF is available here.
PDF is available here.
Abstract
We used wheat lacking H genes to compare the survival and growth of a nonadapted strain to two H-adapted strains. The two adapted strains differed in that one had been selected for adaptation to H9, whereas the other strain had been selected for adaptation to H13. Tests showed that two H-adapted str...
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PMID: 21735929
PDF is available here.
PDF is available here.
Abstract
We investigated the dusk to dawn anopheline mosquito activity patterns, host-seeking and resting locations in coastal plain, hilly and highland areas in West Timor and Java. Adult mosquitoes were captured landing on humans or resting in houses or animal barns. Data analyzed were: mosquito night-time...
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PMID: 21706933
PDF is available here.
PDF is available here.
Abstract
Understanding the epidemiology of human H5N1 cases in Indonesia is important. The question of whether cases are clustered or not is unclear. An increase in clustered cases suggests greater transmissibility. In the present study, 107 confirmed and 302 suspected human H5N1 cases in Indonesia during 200...
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PMID: 21706937
PDF is available here.
PDF is available here.
Abstract
Abstract
Although it is crucial to examine the environmental correlates of physical activity (PA) for developing more effective interventions for overweight populations, limited studies have investigated differences in the environmental correlates on body mass index (BMI). The purpose of the...
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PMID: 21695022
PDF is available here.
PDF is available here.
Tropical biomedicine (28)1 2011
Abstract
Ovitrap surveillance was conducted in methodically selected areas in Bentong, Pahang, Malaysia from June 2008 till December 2009 in order to identify insular sites with stable Aedes aegypti population. Eleven sites were surveyed in Bentong district, Pahang, and one of these locations (N3º33' E101º5...
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PMID: 21602768
PDF is available here.
PDF is available here.
Zoological Research (32)2 2011
Abstract
To provide initial value for population restoration and management of wolves (Canis lupus) in the wild, line transect survey and fecal analysis method were used to study the population ecology of wolf at Saihanwula National Nature Reserve, Inner Mongolia. The results revealed that the population numb...
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PMID: 21509971
PDF is available here.
PDF is available here.
Abstract
Abstract
I use a model system of stream biofilms to show that niche partitioning among species of algae can increase the uptake and storage of nitrate, a nutrient pollutant of global concern. I manipulated the number of species of algae growing in the biofilms of 150 stream mesocosms that had been set up to...
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PMID: 21475199
PDF is available here.
PDF is available here.
Abstract
We controlled for variables such as vehicle volumes, income levels, and proximity to limited access highways and to the downtown area. Street network characteristics that were considered in the analysis included street network density and street connectivity along with street network pattern. Our fi...
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PMID: 21376865
PDF is available here.
PDF is available here.
Abstract
In the current study, research was conducted in five cities in China to examine seatbelt use and to explore Chinese drivers' attitudes toward using seatbelts. Multiple data collection methods consisted of 35 initial semi-structured interviews to create questions for an in-person survey and 500 driver...
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PMID: 21376880
PDF is available here.
PDF is available here.
Abstract
We would then be able to implement remedial actions before hotspots develop....
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PMID: 21376926
PDF is available here.
PDF is available here.
Abstract
We evaluate the statistical performance of Msvar, a full-likelihood Bayesian method that infers past demographic change from microsatellite data. Our simulation tests show that Msvar is very efficient at detecting population declines and expansions, provided the event is neither too weak nor too rec...
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PMID: 21385729
PDF is available here.
PDF is available here.
Abstract
We used bootstrapped logistic regression and boosted regression trees (BRT) with cross-validation to identify the weight of each variable, to assess the predictive power of the models, and to map the distribution of HPAI H5N1 risk. HPAI H5N1 clinical disease outbreak occurrence in domestic poultry w...
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PMID: 21408202
PDF is available here.
PDF is available here.
Pest Management Science (67)3 2011
Abstract
Two-spotted spider mites (Tetranychus urticae Koch) oviposit near leaf veins or in leaf folds on the undersides of cotton (Gossypium hirsutum L.) leaves where the humid boundary layer offers protection from desiccation. The authors predicted that the boundary layer of glabrous cotton...
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PMID: 21308962
PDF is available here.
PDF is available here.
Ecological Applications (21)2 2011
Abstract
We carried out a search experiment to measure the detection-effort curve for the invasive species orange hawkweed (Hieracium aurantiacum) in Victoria, Australia. The probability that hawkweed was detected increased with increasing search effort and the number of plants at the location. While detecti...
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PMID: 21563589
PDF is available here.
PDF is available here.
Ecological Applications (21)2 2011
Abstract
We found their A. petiolata study population to exhibit complex dynamics (two-point cycling) at lower efficacies of either rosette or adult management, and stable equilibria at higher management efficacies. This could have important implications for A. petiolata management techniques such as biologi...
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PMID: 21563590
PDF is available here.
PDF is available here.
Ecological Applications (21)2 2011
Abstract
We tested conventional (modified Whittaker plots and Daubenmire and point-line intercept transects) and novel (strip adaptive cluster sampling [SACS]) approaches to sampling understory plants to determine their efficacy for quantifying abundance on control and thinned-and-burned treatment units in P...
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PMID: 21563576
PDF is available here.
PDF is available here.
Ecological Applications (21)2 2011
Abstract
The contributions of biodiversity to ecosystem functioning are increasingly recognized by ecologists, with biodiversity loss considered a significant threat to the maintenance of life-supporting ecosystem goods and services. Although ecologists have increased the amount of realism in biodiversity-eco...
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PMID: 21563573
PDF is available here.
PDF is available here.
Ecological Applications (21)2 2011
Abstract
We test this hypothesis with a data set from 140 subsistence farms in the Andes and find the inverse correlation. Infestations by the Andean potato weevil (Premnotrypes spp.), the most important pest in Andean potato agriculture, decrease with increasing amounts of potato in the landscape. A statist...
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PMID: 21563583
PDF is available here.
PDF is available here.
Abstract
We synthesize recent theory and identify six general mechanisms by which trait variation changes the outcome of ecological interactions. These mechanisms include several direct effects of trait variation per se and indirect effects arising from the role of genetic variation in trait evolution....
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PMID: 21367482
PDF is available here.
PDF is available here.
Abstract
Diversity and microstructure of quitons (Mollusca: Polyplacophora) from the Caribbean of Costa Rica. The polyplacophorans of the coral reef on the Caribbean coast of Costa Rica have been insufficiently studied. The examination of coral rubble accumulated in the shallow sublitoral waters on four colle...
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PMID: 21516641
PDF is available here.
PDF is available here.
Abstract
Information on changes over time in the biodiversity and ecology of tropical systems is of increasing importance against the background of local, regional, and global dynamics. This study aimed to contribute with long-term data on the abundance fluctuations of two species of echinoderms from a tropic...
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PMID: 21513196
PDF is available here.
PDF is available here.
Abstract
We present here latitudinal and bathymetric distribution of the most abundant and frequent bycatch species from the Gulf of California. The samples were obtained from a total of 111 hauls taken during seven research cruises of the closed shrimp season (2002-2005-2007), and also, from research cruise...
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PMID: 21516649
PDF is available here.
PDF is available here.
Abstract
Brycon henni is a native species in Magdalena's River basin, and because of its cultural and economic importance, is strongly overexploited. This study aimed to describe the genetic variability and population structure of this species from Nare and Guatapé rivers basins. A total of 195 individuals w...
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PMID: 21516650
PDF is available here.
PDF is available here.
Abstract
We collected disperse data from museum records (national and international) and explored the possible association between collection records and precipitation data available for the Henri Pittier National Park (PNHP). Likewise, we carried out a systematic population monitoring of G. ovifera in histo...
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PMID: 21516654
PDF is available here.
PDF is available here.
Abstract
Diverse reproductive strategies shown by ferns and lycophytes allow them to colonize a variety of habitats, particularly after the incidence of natural or anthropogenic disturbances. This study assessed the presence, abundance and reproductive strategies of ferns growing in soils of temperate forests...
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PMID: 21516659
PDF is available here.
PDF is available here.
Abstract
We studied fish community composition in Playa Blanca Marine Reserve (9 degrees 40' N - 84 degrees 40' W), a rocky shore site on the central Pacific coast of Costa Rica. We conducted visual surveys of fishes along six strip transects soon after the area was designated a marine reserve in 1995, then...
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PMID: 21513198
PDF is available here.
PDF is available here.
Abstract
Twenty nine cetacean species occur in Costa Rican waters but extensive research has been conducted only for three species. The latter shows there is a lack of general and local information about these mammals, even when the country, has shown a remarkable growth in whale watching activities. The incr...
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PMID: 21516651
PDF is available here.
PDF is available here.
Abstract
Urbanization is one of the most important threats for biodiversity. Among many different organisms, butterflies are useful indicators of environment diversity and quality. The aim of this study was to investigate the Lepidoptera from Corrientes city. Random samplings were performed at two sites: a na...
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PMID: 21516652
PDF is available here.
PDF is available here.
Abstract
Mountain ecosystems have shown slow mineralization activity due to weather conditions, and to some groups with arthropods with special roles. The Collembola is an important group for litter fragmentation, showing different distribution patterns. The objective of the present study was to determine the...
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PMID: 21516653
PDF is available here.
PDF is available here.
Abstract
We used camera-traps to obtain the index of relative abundance and to establish activity pattern of medium and large mammals in Sierra Nanchititla, Mexico. The study was conducted from December 2003 to May 2006, with a total sampling effort of 4 305 trap-days. We obtained 897 photographs of 19 diffe...
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PMID: 21516657
PDF is available here.
PDF is available here.
Abstract
We used two images, one of 1988 (Gilberto) and another of 1995 (Roxanne); other three data sets (2003, 2005 and 2007) were also used to describe the study area without major weather effects. Six categorial maps were obtained and subjected to analysis by 8 Landscape Ecology indexes, that describe the...
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PMID: 21516658
PDF is available here.
PDF is available here.
Abstract
We calculated it spatial-temporal distribution, population parameters (based on size and weight) and diet in the Orinoco Delta ecoregion (Venezuela). The ecoregion was divided in three sections: Golfo de Paria, Boca de Serpiente and Plataforma Deltana. Samples for the rainy and dry seasons came from...
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PMID: 21516638
PDF is available here.
PDF is available here.
Abstract
We estimated sex ratio, reproduction period and feeding habits. To assess growth parameters and infer on the degree of exploitation, the standard length frequency data were analysed using the FISAT (ELEFAN I) computer program. Data revealed a sex ratio of 0.8:1 (M:F), that reproduction occurs all ye...
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PMID: 21513193
PDF is available here.
PDF is available here.
Abstract
The clam Megapitaria squalida is a fishing resource with increasing importance in Northwestern Mexico. Nevertheless, this fishery has shown important variations that could be related to environmental factors. To assess this, monthly landings of M. squalida were analyzed during 2002-2005 for Bahía de...
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PMID: 21516643
PDF is available here.
PDF is available here.
Abstract
To set up a sterile male technique program to control Aedes albopictus (Skuse) in areas in northern Italy, a pilot mass-rearing facility is under development. For this purpose, experiments were carried out to find the optimal larval density for the optimization of the rearing parameters, i.e., to obt...
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PMID: 21404867
PDF is available here.
PDF is available here.
Abstract
Our results demonstrated that increasing female density from one to two or five individuals did not result in the expected two- or five-fold increase in progeny, despite ample food resources available. Instead, decreased fecundity was observed with increasing density for all experiments. The mechani...
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PMID: 21404844
PDF is available here.
PDF is available here.
Abstract
Methyl salicylate, an herbivore-induced plant volatile, has been shown to attract natural enemies and affect herbivore behavior. In this study, methyl salicylate was examined for its attractiveness to natural enemies of the soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), and for its d...
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PMID: 21404848
PDF is available here.
PDF is available here.
Abstract
The density of colonies of leaf-cutting ants, Atta cephalotes L. (Hymenoptera: Formicidae), was measured and compared among coffee (Coffea arabica L.) plantations in five management categories: monoculture conventional, diversified conventional, diversified organic, highly diversified conventional, a...
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PMID: 21404854
PDF is available here.
PDF is available here.