Sentences with phrase «in species abundance»

For this study, Passy developed a novel conceptual framework explaining the variability in species abundance distribution as a function of two gradients — environmental favorability and species stress tolerance.

They believe that the fluctuations in species abundance may herald an overall transformation of the lake ecosystem.

Notable differences in species abundance were found between the three groups, including — caries - free: Streptococcus intermedius and Capnocytophaga; restored disease: Actinomyces odontolyticus and Streptococcus australis; and «untreated» disease: Streptococcus mutans.

I think this paper, and a few others like it that have been published in recent years, indicate that the response of differernt coccolithophore species to changing CO2 is species dependent and more studies will be required to determine how these responses from different species might cause a shift in species abundances in the oceans and the ecosystem as a whole.

Not exact matches

There have also been significant increases in waterbird species diversity and total abundance at sites that received environmental water in Gwydir river system.

The main findings were that there was an increased abundance and species richness of native fish compared to drought years (2005 - 2009) and Commonwealth environmental water contributed to increased base flows in the river channel, increasing hydraulic diversity for native fish.

Many investigations in Europe and North America provide evidence that generally, organically managed soils exhibit a higher abundance and species number than conventionally - managed plots or farms43 (see Figure 2).

Researchers have also found greater diversity and abundance of many other invertebrate species in organic agriculture systems (see Table 4).

A study in California comparing conventional with organic tomato fields showed a higher abundance of natural enemies and greater richness of species in organic tomato fields.

Based on this effective model, the Dragonfly Monitoring Network was created with the aim of gaining a greater knowledge of the distribution and abundance of dragonfly and damselfly species in the Chicago region and, eventually, to expand the network across Illinois and beyond.

While Focus on Feeders is a great event for families, first timers, and veteran bird enthusiasts alike, these observations and lists also contribute to a growing knowledge of birdlife and potential changes in species and abundance.

You can visit Mark at the Forsyth Nature Center on Lucas Avenue in Kingston to pick up copies of Where to Bird in Ulster County and the recently updated companion checklist of species seasonal abundance and occurrence; or just ask questions and talk birds.

Mnemiopsis is a voracious predator, it cuts the food supply for other predators, triggering changes in abundance, species diversity and ecosystem functioning all the way down to bacteria and viruses.

The decline in phosphorus is expected to reduce the abundance of phytoplankton (microscopic plants) and fish that feed on them, species that make up 40 percent of commercial fish yield.

In contrast, if the abundance of species varies asynchronously, the abundance of the community is very stable.

The junk food diet also reduced the abundance of microbial species capable of metabolising flavonoids, which have been suggested to not only assist in weight loss but also exert neuro - protective functions within the brain.

The more asynchronous the species in an ecosystem fluctuate in their abundances, the less likely it becomes unstable.

Launched in 2002 by the Cornell Lab of Ornithology and National Audubon Society, eBird documents the presence or absence of species, as well as bird abundance through checklist data.

Species undergo major changes in distribution and abundance, but show no evolution of morphological characteristics despite major environmental changes.

In the U.S. Upper Midwest, quicker - warming lakes are experiencing shifts in the relative abundance of fish species that support a billion - dollar - plus recreational industrIn the U.S. Upper Midwest, quicker - warming lakes are experiencing shifts in the relative abundance of fish species that support a billion - dollar - plus recreational industrin the relative abundance of fish species that support a billion - dollar - plus recreational industry.

Not surprisingly, each treatment yielded different alterations in the communities, with different bacterial species increasing or decreasing in abundance.

Such studies have concluded that species» ranges shift northwards as the climate warms, but looking at density shifts provides more detailed information about changes in the abundance of species.

Although abundant species enjoy safety in numbers, factors other than abundance could help protect certain frogs after the deadly skin fungus hits their homes.

Species are listed in order of abundance, and isotopic data separate species by what they ate and their envirSpecies are listed in order of abundance, and isotopic data separate species by what they ate and their envirspecies by what they ate and their environment.

Scanning electron microscopy illustrates the difference in the abundance of cell wall - associated galactosaminogalactan (arrows) between the opportunistic fungal pathogen Aspergillus fumigatus and the minimally pathogenic species Aspergillus nidulans.

Sequencing data revealed that while the BaAka and Bantu gut microbes were from similar bacterial species, the abundance of traditional bacterial groups was diminished in the Bantu.

«Prior to the 2016 mass bleaching event, we observed significant variation in the number of fish species, total fish abundance and functional diversity among different fish communities.

By comparing the relative abundance of species of tiny organisms preserved in the deep - sea cores, PRISM scientists could roughly map how cold - loving organisms gave way to warm ones (and vice versa) at different times in the past.

Although bee abundance decreased with an increasing level of urbanization, the number of species present was at its peak in periurban areas, and 60 species — a considerable number — were found at the most urban site.

The researchers were surprised to find that the diversity of invasive species — the total number of non-native species — and the total abundance (or land cover) of invasive plants stayed the same in areas where deer grazed and where they were excluded.

Surveyors counted 324,592 individual trees and shrubs, and sorted them by species — ranking these in turn according to their abundance The above graph shows relative abundance on a logarithmic scale and arrayed from commonest to rarest.

Improvements in eDNA sampling and analysis methods over the past decade «have increased our ability to determine if a species is present or not, and its relative abundance, in aquatic habitats by analyzing a single water sample,» said Baldigo.

Fish surveys at these depths around the northernmost atolls revealed an extremely high abundance of species found only in the Hawaiian Islands.

A new study, the most comprehensive ever on seasonal distribution patterns and historic trends in abundance of white sharks (Carcharodon carcharias) in the western North Atlantic Ocean, used records compiled over more than 200 years to update knowledge and fill in gaps in information about this species.

Using their concept, all fish — regardless of species, size or gender — would be fished in proportion to their abundance and replenishment rate, thereby better preserving the makeup of the ecosystem.

The eDNA probe can detect genetic material from all three manatee species: the West Indian manatee (Trichecus manatus) of Florida and the Caribbean; the less well understood African manatee (Trichecus senegalensis); and the Amazonian manatee (Trichecus inunguis) of South America, so difficult to detect in dark river waters that its abundance, range and behavior are largely unknown.

They found that species origin matters — where exotic species thrive on added nutrients (e.g. fertilizers), native species decline in abundance and diversity.

The nine plant species in Williams's current experimental mix are drought - tolerant, native, and selected to maintain diversity and abundance throughout the season.

In their recent publication, Douglas McCauley, an ecologist at UCSB, and his colleagues argue for three criteria to consider when choosing de-extinction candidates: Select target species with unique functions, concentrate on species that went extinct recently, and only work with species that can be restored to levels of abundance that meaningfully restore ecological function.

Deer clearly avoid certain invasive plants that are increasing in abundance in natural areas, suggesting that the herbivores are indirectly contributing to the growth and spread of unpalatable invasive plant species, noted lead author Kristine Averill, who spearheaded the research while pursuing her doctoral degree in Ecology at Penn State.

Their work found an association between the presence of these European - introduced invertebrates and reductions in the abundance of certain tree and other plant species in the understory of sugar maple forests in southern Québec (Canada).

Such data is a valuable resource to scientists, allowing us to describe the changes in distribution and abundance of species and to understand why these changes are taking place.»

When Robert Paine introduced it in 1969, he envisioned its mechanisms as a dominant predator consuming and controlling the abundance of a particular prey species and a prey species competing with other species in its trophic class and excluding them from the community.

Conversely, other species, such as the grizzled skipper butterfly (Pyrgus malvae), the September thorn moth (Ennomos erosaria) and the mouse moth (Amphipyra tragopoginis), have experienced deteriorating climates resulting in declines in abundance and distribution size.

Results show that species such as the treble brown spot moth (Idaea trigeminata) and the speckled wood butterfly (Pararge aegeria) which are sensitive to climate, and for which the climate has improved the most, have experienced the greatest increases in their distribution size and abundance.

Nearly two - thirds of the changes in abundance can be explained by these species - specific differences.

Populations of the remaining species show a 25 percent average decline in abundance.

Though many species appear to have trivial niches (in terms of total biomass, numerical abundance or relative role in ecosystem metabolism), we should remember that the relative effects of various organisms in biological systems are seldom static, and minor species can sometimes become very important as systems fluctuate.

Dr Tom Oliver, Co-author and Associate Professor in Landscape Ecology at the University of Reading, said: «Climate appears to have a key role in determining the distributions and abundances of species.

«In mutualism, we see that first, the abundances of each species become equal, 50 - 50, and then the overall size of the populations reach equilibrium, whereas in the competitive regime it's the other way around,» Gore explainIn mutualism, we see that first, the abundances of each species become equal, 50 - 50, and then the overall size of the populations reach equilibrium, whereas in the competitive regime it's the other way around,» Gore explainin the competitive regime it's the other way around,» Gore explains.