Distribution, Density, Diet and Habitat Use of the Otter in Relation to Land Use in the Araglin Valley, Southern Ireland

2004 ◽  
Vol 104B (1) ◽  
pp. 1-17
Author(s):  
Paola Ottino ◽  
Paul Giller
2019 ◽  
Vol 12 ◽  
pp. 194008291882259 ◽  
Author(s):  
Vinod Krishnan ◽  
Mavatur Ananda Kumar ◽  
Ganesh Raghunathan ◽  
Sreedhar Vijayakrishnan

Understanding the impacts of land-use mosaics on elephant distribution and the patterns of habitat use is essential for their conservation in modified landscapes. We carried out a study in 205 villages, covering 610 km2 of plantation–agriculture–forest mosaic of Hassan–Madikeri divisions in southern India, an area of intense human–elephant interactions. We monitored elephant movements, crop damage incidents, and human casualties on a daily basis for a 2-year period (2015–2017) to understand the patterns of elephant distribution across the landscape and habitat-use patterns, resulting in 1,117 GPS locations across six major habitats. Elephants were distributed across the landscape in the first year, but a high concentration of locations were noticed toward northern part of the study area during the second year, owing to clear felling of trees and installation of barriers around coffee plantations, causing an overall shift in their distribution. Investigations into habitat use by elephants revealed that during the day, elephants preferred monoculture refuges of acacia, eucalyptus, and so on, and forest fragments, avoiding reservoir, coffee, roads, and habitations. At night, agricultural lands were used more frequently while moving between refuges compared with forest fragments and habitations. Seasonally, forest fragments and agriculture were used significantly more during dry and wet, respectively. Across years, use of monoculture refuges and coffee increased with a corresponding decrease in the use of forest fragments and agriculture. In areas devoid of forest habitats, retention of monoculture refuges which provide shelter for elephants and facilitating free movement through open habitats may help minimize human–elephant conflict and promote coexistence in such land-use mosaics.


2005 ◽  
Vol 11 (6) ◽  
pp. 856-868 ◽  
Author(s):  
Gilles Gauthier ◽  
Jean-Francois Giroux ◽  
Austin Reed ◽  
Arnaud Bechet ◽  
Luc Belanger

2009 ◽  
Vol 87 (5) ◽  
pp. 422-432 ◽  
Author(s):  
D. Gallant ◽  
L. Vasseur ◽  
M. Dumond ◽  
E. Tremblay ◽  
C. H. Bérubé

Habitat preferences of river otters ( Lontra canadensis (Schreber, 1777)) are well known, but because most studies were conducted in regions with markedly low or high levels of anthropogenic disturbances, it is not well known how their habitat usage is affected by varied anthropogenic disturbances and land-use regimes on a regional scale. We studied habitat use by otters in eastern New Brunswick, Canada, in an area having both protected and disturbed riparian habitats. Using long-range winter riparian transects, we documented activity-sign distribution along riverbanks in relation to 12 habitat factors and 9 categories of anthropogenic disturbances. We documented variables at site with activity signs and at habitat stations along riverbanks at 500 m intervals. We used logistical regressions and Akaike’s information criterion in an information–theoretic approach to compare models and determine the important factors involved. Habitat-related factors were more important than anthropogenic ones in describing habitat use. The best performing models were those incorporating both habitat and anthropogenic factors. Beaver ( Castor canadensis Kuhl, 1820) ponds were the most important habitat factor, while fields were the most important anthropogenic factor. Our results indicate that otters responded mostly to the presence of habitat features they use and secondarily to the presence of anthropogenic structures or activities in an area.


2012 ◽  
Vol 29 (9) ◽  
pp. 577-584 ◽  
Author(s):  
Risa Naito ◽  
Michimasa Yamasaki ◽  
Ayumi lmanishi ◽  
Yosihiro Natuhara ◽  
Yukihiro Morimoto

Oryx ◽  
2002 ◽  
Vol 36 (2) ◽  
pp. 161-169 ◽  
Author(s):  
R. K. B. Jenkins ◽  
G. R. Corti ◽  
E. Fanning ◽  
K. Roettcher

High cattle densities, expanding human settlements and the conversion of miombo woodland into farms and teak plantations are threatening wildlife populations in the Kilombero Valley, Tanzania, and conservation research on this internationally important wetland is required as part of an integrated approach to its future management. The effect of land-use change on antelopes (family Bovidae) was investigated by surveying tracks and dung during three seasons over 1999–2000 in an area of mixed land-use. Use of miombo woodland, grassland and farmland habitats by antelopes was highest during the wet season (April–May), probably representing the movements of animals away from the floodplain. Duiker, puku Kobus vardoni and reedbuck Redunca spp. predominantly used the farmland during the wet season, at which time buffalo Syncerus caffer were more common in the miombo woodland. The findings of this study have three main implications for the conservation of the valley. Firstly, the inadvertent provision of suitable wet season habitats for puku and other small-medium antelopes by rice farmers could lead to higher levels of illegal hunting, and may increase the potential for conflict between agriculture and wildlife. Secondly, the loss of miombo vegetation will most strongly affect the larger species of antelope (sable Hippotragus niger and waterbuck Kobus ellipsiprymnus), which favour open-woodland habitats; future work should therefore determine levels of habitat use by antelopes in and around maturing teak plantations. Thirdly, any management prescriptions to conserve the Kilombero Valley should include the land on the edge of the floodplain.


2019 ◽  
Vol 8 (2) ◽  
pp. 96 ◽  
Author(s):  
Michele Melchiorri ◽  
Martino Pesaresi ◽  
Aneta Florczyk ◽  
Christina Corbane ◽  
Thomas Kemper

The Global Human Settlement Layer (GHSL) produces new global spatial information, evidence-based analytics describing the human presence on the planet that is based mainly on two quantitative factors: (i) the spatial distribution (density) of built-up structures and (ii) the spatial distribution (density) of resident people. Both of the factors are observed in the long-term temporal domain and per unit area, in order to support the analysis of the trends and indicators for monitoring the implementation of the 2030 Development Agenda and the related thematic agreements. The GHSL uses various input data, including global, multi-temporal archives of high-resolution satellite imagery, census data, and volunteered geographic information. In this paper, we present a global estimate for the Land Use Efficiency (LUE) indicator—SDG 11.3.1, for circa 10,000 urban centers, calculating the ratio of land consumption rate to population growth rate between 1990 and 2015. In addition, we analyze the characteristics of the GHSL information to demonstrate how the original frameworks of data (gridded GHSL data) and tools (GHSL tools suite), developed from Earth Observation and integrated with census information, could support Sustainable Development Goals monitoring. In particular, we demonstrate the potential of gridded, open and free, local yet globally consistent, multi-temporal data in filling the data gap for Sustainable Development Goal 11. The results of our research demonstrate that there is potential to raise SDG 11.3.1 from a Tier II classification (manifesting unavailability of data) to a Tier I, as GHSL provides a global baseline for the essential variables called by the SDG 11.3.1 metadata.


2007 ◽  
Vol 87 (Special Issue) ◽  
pp. 225-233 ◽  
Author(s):  
S K Javorek ◽  
R. Antonowitsch ◽  
C. Callaghan ◽  
M. Grant ◽  
T. Weins

Agricultural land in Canada comprises cultivated land, hayland and grazing land with associated riparian areas, wetlands, woodlands, and natural grasslands. Although these agro-ecosystems support many species of Canada’s native fauna, agricultural land use is dynamic, and changes in agricultural practices can have important implications for biodiversity. We report on Agriculture and Agri-Food Canada’s National Agri-environmental Health Analysis and Reporting Program’s assessment of wildlife habitat on farmland in Canada. Habitat use matrices were developed for 493 species of birds, mammals, reptiles and amphibians associated with farm land habitat in Canada. We derived patterns of land use from Statistics Canada’s Census of Agriculture data and applied them at the soil landscape polygon scale. We developed a proportionally weighted Habitat Capacity index to relate habitat use and land use. A 5% decrease in Habitat Capacity occurred on Canada’s agricultural land from 1981 to 2001, associated with an expansion in cropland and a decline in pasture. A regional pattern of small decline in Habitat Capacity is evident in the Prairie Provinces, where dramatic declines in the use of summerfallow had a positive impact on Habitat Capacity. In eastern Canada, greater decreases in Habitat Capacity occurred, associated with an increase in agricultural intensification. Policies and programs designed to sustain biodiversity should not be developed independently of socioeconomic factors or policies favouring agricultural intensification. We recommend a holistic approach to making policy decisions relevant to environmental and economic sustainability in the Canadian agricultural landscape. Key words: Biodiversity, land use change, agroecosystems, wildlife habitat, indicators


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