scholarly journals Road effects on species abundance and population trend: a case study on tawny owl

2019 ◽  
Vol 65 (6) ◽  
Author(s):  
Shirley van der Horst ◽  
Fernando Goytre ◽  
Ana Marques ◽  
Sara Santos ◽  
António Mira ◽  
...  
Keyword(s):  
Species Abundance ◽  
Population Trend ◽  
Tawny Owl ◽  
Road Effects

scholarly journals Variations in Total Species Richness and the Unevenness of Species Abundance Distribution between Two Distant Conus Communities (Neogastropoda): A Case Study in Mannar Gulf (India)

2019 ◽  
pp. 1-18
Author(s):  
Jean Béguinot
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Species Abundance ◽  
Species Abundance Distribution ◽  
Abundance Distribution ◽  
Marine Gastropods ◽  
Total Species Richness ◽  
Species Recruitment ◽  
Total Species

The genus Conus forms a conspicuous and rather homogeneous group within marine Gastropods. This makes it all the more interesting to focus on the sub-communities formed by Conus species and to analyze the potential specificities in the internal organization of species in these communities, in particular species richness, species abundance distribution and the effect of geographical distance between communities on differences in their respective species composition. Accordingly, two Conus communities along the coast in Mannar Gulf (India), separated by 80 km, are considered. Reliable analysis requires, first, to treat exhaustive data from complete samplings or, else – as here – to implement an appropriate extrapolation procedure to complete numerically the partial samplings. After numerical completion, substantial differences were highlighted between the two communities, not only in terms of true (total) species richness but, even more, as regards the profile and the average unevenness of the distributions of species abundance. Also, significant dissimilarity in species composition was found between the two communities, that may be tentatively attributed to either deterministic distance decay in similarity of species composition or, alternatively, to the persistence in the stochastic process of species recruitment from the regional stock of Conus planktonic larvae. This preliminary study yet requests to be complemented by other similar case studies, before drawing any safer interpretative conclusions.

scholarly journals Dispersal ability determines the scaling properties of species abundance distributions: a case study using arthropods from the Azores

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Luís Borda-de-Água ◽  
Robert J. Whittaker ◽  
Pedro Cardoso ◽  
François Rigal ◽  
Ana M. C. Santos ◽  
...  
Keyword(s):  
Species Abundance ◽  
Dispersal Ability ◽  
Scaling Properties ◽  
Species Abundance Distributions

The tawny owl Strix aluco as a material collector in faunistic investigations: the case study of small mammals in NE Poland

2011 ◽  
Vol 21 (3) ◽  
pp. 185-191 ◽  
Author(s):  
Michał Żmihorski ◽  
Jakub Gryz ◽  
Dagny Krauze-Gryz ◽  
Anna Olczyk ◽  
Grzegorz Osojca
Keyword(s):  
Small Mammals ◽  
Tawny Owl ◽  
Strix Aluco ◽  
Ne Poland

scholarly journals Colonization of Urban Habitats: Tawny Owl Abundance Is Conditioned by Urbanization Structure

Animals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2954
Author(s):  
Nerea Pagaldai ◽  
Juan Arizaga ◽  
María V. Jiménez-Franco ◽  
Iñigo Zuberogoitia
Keyword(s):  
Large Scale ◽  
Basque Country ◽  
Species Abundance ◽  
Population Level ◽  
Landscape Scale ◽  
Local Scale ◽  
Urban Structure ◽  
Northern Spain ◽  
Natural Habitats ◽  
Tawny Owl

Natural habitats are being altered and destroyed worldwide due to urbanization, leading to a decrease in species abundance and richness. Nevertheless, some species, including tawny owls, have successfully colonized this novel habitat. Consequences at the population level have not been described; thus, our main objective was to describe the effects that urban structure have on the tawny owl population at local and landscape levels. Data were obtained from 527 survey points over 7 months in a large-scale owl survey in the Basque Country (northern Spain) in 2018. At the local scale, the interaction between forest and urban cover affected tawny owl abundance, the optimum being in medium forested areas. The interaction between urban cover and clumpiness index (urban patch distribution) showed a generally negative effect. At the landscape scale, its abundance decreased in complex-shaped urban patches and when distance between them was greater. In conclusion, at the local scale, when a minimal forest structure is present in urbanized areas, the species can exploit it. At the landscape scale, it prefers smaller urban towns to cities. Thinking ahead, the current tendency toward “green capitals” should benefit tawny owl populations.

scholarly journals The importance of isolated patches for maintaining local bird biodiversity and ecosystem function: a case study from the Pernambuco Center of Endemism, Northeast Brazil

2018 ◽  
Vol 108 (0) ◽  
Author(s):  
Leila F. A. S. Campos ◽  
Bruno P. Teixeira ◽  
Márcio A. Efe
Keyword(s):  
Species Abundance ◽  
Bird Species ◽  
Bird Community ◽  
Northeastern Brazil ◽  
Ecosystem Functions ◽  
Forest Fragment ◽  
Human Disturbances ◽  
Highly Sensitive

ABSTRACT The Atlantic Forest has been highly fragmented, with the Pernambuco Center of Endemism (PCE) one of the priority areas for conservation. The Mata do Cedro forest, located in Alagoas state, northeastern Brazil, is a forest fragment within the PCE surrounded by a matrix of sugarcane that acts as a refuge for several threatened bird species, some of which are endemic to the region. Here, we characterize the bird community in Mata do Cedro using measures of species abundance, frequency of occurrence, habitat use and sensitivity to human disturbance. The functional role of species was investigated with a functional dendrogram. We registered 111 species, most resident and forest dependent. The most representative trophic categories were insectivores followed by frugivores. Of the species found, 11 are highly sensitive to human disturbances and 11 are endemic to the PCE. The bird community of the fragment is highly diversified, with endemic taxa and balanced trophic categories typical of preserved tropical forests. This community structure together with the occurrence of threatened species reinforces the importance of Mata do Cedro for the maintenance of local biodiversity and ecosystem functions.

Designing marine reserves to reduce bycatch of mobile species: a case study using juvenile red snapper (Lutjanus campechanus)

2010 ◽  
Vol 67 (8) ◽  
pp. 1335-1349 ◽  
Author(s):  
Sandra L. Diamond ◽  
Kristin M. Kleisner ◽  
Daisy Englert Duursma ◽  
Yuning Wang
Keyword(s):  
Hot Spots ◽  
Marine Reserves ◽  
Species Abundance ◽  
Red Snapper ◽  
Lutjanus Campechanus ◽  
Mobile Species ◽  
Trade Offs ◽  
Over Time ◽  
Specific Conservation

Marine reserves have not been widely used to conserve mobile species because species abundance levels can be highly variable over space and time. Here we explore the potential for marine reserves to reduce bycatch of mobile species using red snapper ( Lutjanus campechanus ) as a case study. Bycatch in Gulf of Mexico shrimp trawls is a major source of juvenile red snapper mortality, and marine reserves may be mandated if bycatch reduction targets are not met. Using geographic information system (GIS) analyses of fishery-independent data, we investigated whether red snapper juveniles concentrate in “hot spots” and examined the trade-offs between abundance within hot spots (intensity) and predictability over time (persistence). These trade-offs allow fishery managers to tailor marine reserves to meet specific conservation goals. For red snapper, hot spots were primarily located around the 30 m isobath, with hot spots spread along the Texas coast in fall and clustered around the Texas–Louisiana border in summer. Increased intensity of hot spots led to lower persistence due to the smaller spatial area of higher intensity hot spots. Hot spots moved annually but generally persisted in the same locations over time, indicating that marine reserves could reduce red snapper bycatch. This approach provides a foundation for making informed decisions about design and placement of reserves for mobile species.

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