Sentences with phrase «abundance of species»

In every case, except for P. delicatissima in the initial experiment, temperature was a much stronger influence on the final abundance of each species than pCO2 (table 4).

eDNA also gives a picture of how the relative abundance of species differs from one habitat to another.

For example, reductions in seasonal sea ice cover and higher surface temperatures may open up new habitat in polar regions for some important fish species, such as cod, herring, and pollock.128 However, continued presence of cold bottom - water temperatures on the Alaskan continental shelf could limit northward migration into the northern Bering Sea and Chukchi Sea off northwestern Alaska.129, 130 In addition, warming may cause reductions in the abundance of some species, such as pollock, in their current ranges in the Bering Sea131and reduce the health of juvenile sockeye salmon, potentially resulting in decreased overwinter survival.132 If ocean warming continues, it is unlikely that current fishing pressure on pollock can be sustained.133 Higher temperatures are also likely to increase the frequency of early Chinook salmon migrations, making management of the fishery by multiple user groups more challenging.134

Historical fluctuations in the abundance of this species have been described on the basis of a centuries - long time - series of tuna trap catches, starting in the seventeenth century, and suggested to be linked to climate fluctuations [269].

Rising temperatures are associated with decreased snowpack, and many ecosystems are experiencing climate - induced shifts in the activity, range, or abundance of the species that inhabit them.

This aquarium is home to an abundance of species of shark, including ragged tooth sharks and nurse sharks.

Day 5 Full - day safari in the Kruger, one of the world's largest and best managed game reserves with an abundance of species including elephant, rhino, buffalo, lion and leopard, zebra, cheetah and hippo.

The area is also known for its marine life and boasts an abundance of species, such as abalone and crayfish.

PCR is used to amplify a barcode region, such as the 16S or 12S ribosomal RNA genes, and NGS reads are used to identify the variety and abundance of species in samples.

The abundance of each species was compared between warmer and cooler sites.

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.»

«We found that the local presence and abundance of a species reflect not only its need for particular temperatures and environmental conditions but also its ecological interactions.

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

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.

THE MATHEMATICAL FORMULA associated with a radical theory of ecology exactly predicts both the diversity and abundance of the species that make up a community.

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.

Genetic diversity indicates the past abundance of a species because large populations tend to accumulate diversity through random DNA mutations and breeding, while small populations lose it through inbreeding.

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

Many studies on land have located regions that are home to a remarkable abundance of species; that knowledge has been a great boon to conservation efforts.

Research carried out on tomato plots on the effects of weed control on surface - dwelling arthropod species found the abundance of species is clearly influenced by weed biomass.

For the past three years, the company has partnered with the national Blue Ocean Institute to educate customers about the methods used to catch fish and the abundance of the species they carry.

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 explains.

«The aim of neutral theory is to explain diversity and the relative abundances of species within ecosystems.

Not exact matches

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.

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.

Breast milk sugars may mediate the relative abundances of different bacterial species [24].

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.

The selected stationary phases fully leverage the separation power of sub-2-µm particle technology, delivering the efficiency and selectivity required for complex separations such as discovery of low - abundance species, peptide mapping, protein identification, and biomarker discovery.

The study, «Response of understory vegetation to salvage logging following a high - severity wildfire,» reports a modest difference between logged and unlogged areas for some shrubs, but researchers with the agency's Pacific Southwest Research Station conclude the diversity of plant species and their abundance, as a whole, differed little between logged and unlogged sites.

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.

What matters to most bee species is the abundance and quality of pollen — and if an introduced plant, such as the red vetch, offers more protein - rich food than the natives around it, the bees will collect its pollen.

«We measure growth rate of certain tundra species and the vegetation composition and abundance.

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 model can help us plan for restoration and management actions to increase survival and abundance of many of the sea - run fish species, including those that are endangered or threatened.»

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.

Fishing communities can survive — and even thrive — as fish abundance and market prices shift if they can catch a variety of species and nimbly move from one fishery to the next.

We highlight episodes of climate change that have disrupted ecosystems and trophic interactions over time scales ranging from years to millennia by changing species» relative abundances and geographic ranges, causing extinctions, and creating transient and novel communities dominated by generalist species and interactions.

The ambitious census was born 3 years ago, after marine biologists realized that new technologies — from sensors that can track individual fish and whales to genetic «bar code» readers that can speedily separate microscopic species — could revolutionize efforts to document the diversity, distribution, and abundance of ocean animals.

One of the most popular explanations for species abundance holds that seemingly homogeneous habitats consist of many niches.

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 industry.

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.

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.