Little evidence of native and non-native species influencing one another's abundance and distribution in the herb layer of an oak woodland

2015 ◽  
Vol 26 (5) ◽  
pp. 1005-1012 ◽  
Author(s):  
Mark A. Davis ◽  
Michael D. Anderson ◽  
Lilly Bock-Brownstein ◽  
Anna Staudenmaier ◽  
Melena Suliteanu ◽  
...  
Keyword(s):  
Native Species ◽  
Herb Layer ◽  
Oak Woodland ◽  
Abundance And Distribution

scholarly journals Herb-Layer Dynamics in an Old-Growth Forest: Vegetation–Environment Relationships and Response to Invasion-Related Perturbations

Forests ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1069
Author(s):  
Taylor M. Buskey ◽  
Margaret E. Maloney ◽  
Julia I. Chapman ◽  
Ryan W. McEwan
Keyword(s):  
North America ◽  
Native Species ◽  
Alliaria Petiolata ◽  
Agrilus Planipennis ◽  
Permanent Plots ◽  
Individual Species ◽  
Herb Layer ◽  
Old Growth ◽  
Old Growth Forest ◽  
Forest Remnant

Temperate forests of eastern North America are subject to multiple invasions from non-native species that have the potential to drive long-term dynamics in biodiversity. Garlic mustard (Alliaria petiolata (M. Bieb.) Cavara and Grande) is an invasive plant in many deciduous forests, and management efforts often focus on removing this species to initiate native species restoration. Agrilus planipennis Fairmaire (emerald ash borer; Coleoptera: Buprestidae) is a non-native insect pest that has caused substantial loss of ash trees (Fraxinus spp. L.) in North America. Our goal was to understand how the herbaceous layer in an old-growth forest responded to the removal of a significant invasion of A. petiolata and the loss of Fraxinus spp. due to A. planipennis. Herbaceous diversity and environmental parameters were measured in 32 permanent plots (1 m2 each) from 2012 to 2020 in an old-growth forest remnant that had experienced A. petiolata invasion and subsequent removal as well as mortality of Fraxinus spp. due to A. planipennis. Near-total loss of Fraxinus spp. as a canopy tree was not associated with changes in the understory light environment, possibly due to rapid canopy closure by adjacent trees not susceptible to the insect. Alliaria petiolata removal was associated with changes in herbaceous species richness and possibly shifts in individual species importance. Vegetation–environment relationships remained stable throughout the sampling period, suggesting that resource-related factors that structure the herb layer prevailed throughout the changes associated with Fraxinus spp. mortality and A. petiolata management. From a natural area management perspective, our data offer support for the idea that A. petiolata removal influences herb-layer diversity and indicate that in stands with a diverse tree community, the loss of Fraxinus spp. may not directly influence understory biodiversity.

scholarly journals Evidence of change in a low-elevation forest bird community of Hawai'i since 1979

2003 ◽  
Vol 13 (3) ◽  
pp. 175-187 ◽  
Author(s):  
Michelle H. Reynolds ◽  
Richard J. Camp ◽  
Bonnie M. B. Nielson ◽  
James D. Jacobi
Keyword(s):  
Native Species ◽  
Bird Species ◽  
Bird Community ◽  
Natural Area ◽  
Present Evidence ◽  
Forest Bird ◽  
Bird Survey ◽  
Elevational Range ◽  
Abundance And Distribution ◽  
Avian Disease

We evaluated the abundance and distribution of low-elevation forest birds on windward Hawai'i Island during August 1993-February 1994, and present evidence of changes in the species composition of the forest bird community since 1979. Endemic Hawaiian birds occurred in native-dominated forests as low as 120 m elevation. Non-native species were detected at all survey locations. We observed non-native Saffron Finch Sicalis flaveola, previously unrecorded in Puna. Variable circular plot surveys of Kahauale'a Natural Area Reserve indicated the disappearance of two native species ('I'iwi Vestiaria coccinea and 'O'u Psittitostra psittacea), and two non-native additions (Red-billed Leiothrix Leiothrix lutea and Kalij Pheasant Lophura leucomelana) to the study area since the Hawai'i Forest Bird Survey conducted in 1979. We present evidence that native 'Elepaio Chasiempsis sandwichensis has experienced a decrease in population density and an elevational range contraction since 1979. Surveys indicate Puna's forest bird community has had increasing aliens and declining native species since 1979. The persistence of some native bird species within the range of avian disease vectors such as Culex quinquefasciatus in forests below 1,000 m elevation presents an important enigma that requires additional study.

scholarly journals Custodianship of wildlife on private land to support conservation – an Australian model

2020 ◽  
Vol 42 (5) ◽  
pp. 309
Author(s):  
George Wilson ◽  
Melanie Edwards ◽  
Neil Byron
Keyword(s):  
National Parks ◽  
Financial Incentives ◽  
Native Species ◽  
Economic Value ◽  
Sustainable Use ◽  
Sharing Economy ◽  
Private Land ◽  
Species Lists ◽  
Abundance And Distribution ◽  
Do So

A large proportion of the world’s extinctions have occurred in Australia, and threatened species lists continue to grow, notwithstanding government and philanthropic efforts. Most losses have been on private land, so relying on national parks and reserves is not enough to reverse trends and meet Australia’s responsibilities. This paper proposes a model that could increase abundance and distribution of Australia’s biodiversity, while providing financial incentives to private landholders to do so. It addresses the question, can landholder management of wildlife, and a form of private ownership, remedy shortfalls in government funding for biodiversity conservation and the resulting consequences of vast biodiversity losses? Landholders currently invest in propagating introduced livestock species, but they are prevented by current regulations from investing in a similar manner in threatened Australian native species. Market-based incentives could increase the distribution and abundance of species on private land and help protect the habitat of other biodiversity. The enabling changes would be contentious to some people but are consistent with the International Union for the Conservation of Nature’s Sustainable Use policy. Different versions of wildlife privatisation have been successfully applied internationally: there is urgency for Australia to draw on these experiences and develop its own model to encourage and support wildlife on private freehold land. The model proposed in this paper focuses on: identifying locally overabundant populations or captive-bred populations as sources of supply; finding landholders and philanthropists who would like to have custodianship of species; enabling entrepreneurs to respond to demand; and bringing the two together where there is scope for a market-based sharing economy. Encouraging wildlife custodianship on private freehold land would be mutually beneficial, as it would not only result in an increase in biodiversity, but the economic value of wildlife could provide an income to landholders as well as enhancing Australia’s conservation system.

Recovery of herb‐layer vegetation and soil properties after pile burning in a Midwestern oak woodland

2021 ◽  
Author(s):  
Matthew A. Albrecht ◽  
Noah D. Dell ◽  
Megan J. Engelhardt ◽  
J. Leighton Reid ◽  
Michael L. Saxton ◽  
...  
Keyword(s):  
Soil Properties ◽  
Herb Layer ◽  
Oak Woodland

scholarly journals Dynamics and predicted distribution of an irrupting ‘sleeper’ population: fallow deer in Tasmania

2021 ◽  
Author(s):  
Calum Cunningham ◽  
George L W Perry ◽  
David Bowman ◽  
David M Forsyth ◽  
Michael M Driessen ◽  
...  
Keyword(s):  
Range Expansion ◽  
Habitat Suitability ◽  
Native Species ◽  
Population Change ◽  
Fold Increase ◽  
Fallow Deer ◽  
Fine Grained ◽  
Island State ◽  
Remote Camera ◽  
Abundance And Distribution

Abstract Sleeper populations of non-native species can remain at low abundance for decades before irrupting. For over a century, fallow deer ( Dama dama ) in the island state of Tasmania, Australia, remained at low abundance and close to the region in which they were released. Recently, there are indications the population has increased in abundance and distribution. Here, we spatially quantify the population change using a time series of annual spotlight counts from 1985 to 2019 (total of 5,761 counts). Next, we predict the potential for further range expansion, using global occurrences to characterise the species’ climatic niche, and remote-camera surveys (n = 3,225) to model fine-grained habitat suitability. Spotlight counts of fallow deer increased by 11.5% annually, resulting in a 40-fold increase from 1985 to 2019. The core distribution increased 2.9-fold during this 35-year period, and now spans c. 27% of Tasmania’s land area. Satellite populations have established in locations where farmed deer have escaped or been released, suggesting that humans have facilitated some of the range expansion via new introduction events. Based on climate and habitat suitability, our models predict that 56% of Tasmania is suitable under the current climate. This suggests range expansion is likely to continue unless the population is actively managed, which could include the eradication of satellite populations and containment of core populations. This case study cautions that despite over a century of slow population growth, sleeper populations of non-native species can abruptly increase.

scholarly journals The fish fauna of streams from the upper rio Tocantins basin, Goiás State, Brazil

Check List ◽  
2013 ◽  
Vol 9 (1) ◽  
pp. 28 ◽  
Author(s):  
Alexander Claro-García ◽  
Oscar Akio Shibatta
Keyword(s):  
Habitat Loss ◽  
Fish Species ◽  
Native Species ◽  
Poecilia Reticulata ◽  
Fish Fauna ◽  
Dry Season ◽  
Undescribed Species ◽  
Number Of Species ◽  
Abundance And Distribution

This study aimed to provide a list of fish species from tributaries of rio das Almas and rio Maranhão basins, in the upper rio Tocantins basin, Goiás State, Brazil. For this study 21 stream stretches were sampled during the dry season in July 2010. A total of 2,279 individuals of 67 species, 19 families and five orders were collected. The most representative families in number of species were Characidae, Loricariidae, and Crenuchidae respectively. The genus Knodus, Hypostomus and Characidium showed the greatest abundance and distribution among the samplings. Poecilia reticulata was considered the only non-native species. The presence of a large number of endemic and undescribed species or with undefined taxonomic situation, in addition to the rapid habitat loss in this region, juts the need for the development of further studies in this basin.

Summer bird abundance and distribution on set-aside fields on intensive arable farms in England

Ecography ◽  
2000 ◽  
Vol 23 (1) ◽  
pp. 50-59 ◽  
Author(s):  
Ian G. Henderson ◽  
Juliet A. Vickery ◽  
Robert J. Fuller
Keyword(s):  
Bird Abundance ◽  
Abundance And Distribution

Ice-free area expansion compounds the non-native species threat to Antarctic terrestrial biodiversity

2019 ◽  
Author(s):  
Grant Duffy ◽  
Jasmine R Lee
Keyword(s):  
Human Activity ◽  
Native Species ◽  
Climate Scenario ◽  
Climatic Environment ◽  
Species Establishment ◽  
Suitable Habitats ◽  
Terrestrial Biodiversity ◽  
A Site ◽  
Area Expansion ◽  
Free Area

Warming across ice-covered regions will result in changes to both the physical and climatic environment, revealing new ice-free habitat and new climatically suitable habitats for non-native species establishment. Recent studies have independently quantified each of these aspects in Antarctica, where ice-free areas form crucial habitat for the majority of terrestrial biodiversity. Here we synthesise projections of Antarctic ice-free area expansion, recent spatial predictions of non-native species risk, and the frequency of human activities to quantify how these facets of anthropogenic change may interact now and in the future. Under a high-emissions future climate scenario, over a quarter of ice-free area and over 80 % of the ~14 thousand km2 of newly uncovered ice-free area could be vulnerable to invasion by one or more of the modelled non-native species by the end of the century. Ice-free areas identified as vulnerable to non-native species establishment were significantly closer to human activity than unsuitable areas were. Furthermore, almost half of the new vulnerable ice-free area is within 20 km of a site of current human activity. The Antarctic Peninsula, where human activity is heavily concentrated, will be at particular risk. The implications of this for conservation values of Antarctica and the management efforts required to mitigate against it are in need of urgent consideration.

ESTIMATION OF THE ABUNDANCE AND DISTRIBUTION OF RARE EARTH ELEMENTS IN SOIL AROUND KADUNA REFINING AND PETROCHEMICAL COMPANY USING NUCLEAR TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 599-604
Author(s):  
Michael A. Onoja ◽  
P. H. Bukar ◽  
C. U. Omeje ◽  
A. M. Adamu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Nuclear Technique ◽  
Flood Plains ◽  
Economic Exploitation ◽  
Rare Elements ◽  
Petrochemical Company ◽  
The Moment ◽  
Abundance And Distribution ◽  
Natural Pattern

Instrumental neutron activation analysis (INAA) technique was used to investigate the abundance and distribution of rare earth elements (REE) in soil around Kaduna Refinery. The aim of the study is to assess the rare elements potential of Nigeria for economic exploitation. Five REEs (La, Dy, Eu, Yb, and Lu) were detected in varying concentrations ranging from a minimum of 0.6 µg/g (Lu) to a maximum of 249.0 µg/g (La). The elements existed with trends consistent with the natural pattern of REEs in soil, showing significant Eu and Dy anomalies which characterize upper plains and flood plains. The levels of REEs in soil in the study area were generally slightly above background levels, with minimal (La, Dy, and Eu), moderate (Yb), and significant (Lu) enrichments and trending: Lu ˃Yb ˃ Eu ˃ Dy ˃ La. The abundance of the REEs investigated cannot establish a potential of Nigeria for economic exploitation of the mineral, hence, rare earth project in the study area is not viable at the moment.

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