scholarly journals Modeling habitat suitability of vulnerable Mollucan Babirusa Babyrousa babyrussa in small island of Buru, Indonesia

2021 ◽  
Author(s):  
Andri A Wibowo
Keyword(s):  
Habitat Suitability ◽  
Iucn Red List ◽  
Small Island ◽  
Primary Forest ◽  
Suitable Habitat ◽  
Suitability Analysis ◽  
The South ◽  
Soil Elevation ◽  
Barren Soil ◽  
Suitable Habitats

Babirusa is a mammal belongs to Suidae family. This mammal belongs to Babyrousa genus is known endemic to Indonesia. Recently there are 3 species of Babyrousa, one species is Babyrousa babyrussa, listed as Vulnerable on the IUCN Red List of Threatened Species. Babyrousa occurs in Indonesia on Sulawesi island, Togian, Sula islands, and Taliabu, Mangole and Buru islands in the Molucca regions. The Moluccan Babirusa is now restricted to upland forests and mountainous terrain. Then this study aims to assess the suitability of Buru island as habitat for Moluccan Babirusa. The suitability analysis was based on GIS analysis using 4 determinant environmental variables required by B. babyrussa species including NDVI, barren soil, elevation, and river network. The particular location was a Batabual landscape sizing 292.60 km2 located in the east parts of Buru island. Based on NDVI, less vegetation covers were observed in north and east parts of Batabual. In contrast, NDVI values were higher in the central, west, and south indicating that half of the landscape was covered by intact primary forest. Batabual has a hilly landscape surrounded by coastal areas with hilly areas were observed in the south and west. There were 2 river streams in the east parts. The analysis has divided the landscape into several parts based on the habitat suitability levels. About one third of the landscape located in north was considered less and not suitable for Babirusa. Some areas in west were also considered moderate to be inhabited by Babirusa considering a presence of hilly landscape that may limit the vertical distribution of Babirusa. Most suitable habitats were estimated in central parts of the landscape spanning to the south. South parts of the landscape were characterized by high NDVI values and forest covers then these areas were considered as suitable habitats for Babirusa. The size of this suitable habitat was estimated around 188.62 km2 or more than half of the size (64.46%) of Batabual landscape.

scholarly journals Predicting Impacts of Climate Change on Northward Range Expansion of Invasive Weeds in South Korea

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1604
Author(s):  
Sun Hee Hong ◽  
Yong Ho Lee ◽  
Gaeun Lee ◽  
Do-Hun Lee ◽  
Pradeep Adhikari
Keyword(s):  
Climate Change ◽  
South Korea ◽  
Habitat Suitability ◽  
Management Strategies ◽  
Southern Region ◽  
Suitable Habitat ◽  
Invasive Weeds ◽  
Northern Regions ◽  
Suitable Habitats ◽  
Control And Management

Predicting the distribution of invasive weeds under climate change is important for the early identification of areas that are susceptible to invasion and for the adoption of the best preventive measures. Here, we predicted the habitat suitability of 16 invasive weeds in response to climate change and land cover changes in South Korea using a maximum entropy modeling approach. Based on the predictions of the model, climate change is likely to increase habitat suitability. Currently, the area of moderately suitable and highly suitable habitats is estimated to be 8877.46 km2, and 990.29 km2, respectively, and these areas are expected to increase up to 496.52% by 2050 and 1439.65% by 2070 under the representative concentration pathways 4.5 scenario across the country. Although habitat suitability was estimated to be highest in the southern regions (<36° latitude), the central and northern regions are also predicted to have substantial increases in suitable habitat areas. Our study revealed that climate change would exacerbate the threat of northward weed invasions by shifting the climatic barriers of invasive weeds from the southern region. Thus, it is essential to initiate control and management strategies in the southern region to prevent further invasions into new areas.

scholarly journals The Extent of Seasonally Suitable Habitats May Limit Forage Fish Production in a Temperate Estuary

2021 ◽  
Vol 8 ◽  
Author(s):  
Mary C. Fabrizio ◽  
Troy D. Tuckey ◽  
Aaron J. Bever ◽  
Michael L. MacWilliams
Keyword(s):  
Chesapeake Bay ◽  
Habitat Suitability ◽  
Reference Points ◽  
Suitable Habitat ◽  
Habitat Conditions ◽  
Forage Production ◽  
Forage Fishes ◽  
Annual Variations ◽  
Suitable Habitats ◽  
Bay Anchovy

The sustained production of sufficient forage is critical to advancing ecosystem-based management, yet factors that affect local abundances and habitat conditions necessary to support aggregate forage production remain largely unexplored. We quantified suitable habitat in the Chesapeake Bay and its tidal tributaries for four key forage fishes: juvenile spotted hake Urophycis regia, juvenile spot Leiostomus xanthurus, juvenile weakfish Cynoscion regalis, and bay anchovy Anchoa mitchilli. We used information from monthly fisheries surveys from 2000 to 2016 coupled with hindcasts from a spatially interpolated model of dissolved oxygen and a 3-D hydrodynamic model of the Chesapeake Bay to identify influential covariates and construct habitat suitability models for each species. Suitable habitat conditions resulted from a complex interplay between water quality and geophysical properties of the environment and varied among species. Habitat suitability indices ranging between 0 (poor) and 1 (superior) were used to estimate seasonal and annual extents of suitable habitats. Seasonal variations in suitable habitat extents in Chesapeake Bay, which were more pronounced than annual variations during 2000–2016, reflected the phenology of estuarine use by these species. Areas near shorelines served as suitable habitats in spring for juvenile spot and in summer for juvenile weakfish, indicating the importance of these shallow areas for production. Tributaries were more suitable for bay anchovy in spring than during other seasons. The relative baywide abundances of juvenile spot and bay anchovy were significantly related to the extent of suitable habitats in summer and winter, respectively, indicating that Chesapeake Bay habitats may be limiting for these species. In contrast, the relative baywide abundances of juvenile weakfish and juvenile spotted hake varied independently of the spatial extent of suitable habitats. In an ecosystem-based approach, areas that persistently provide suitable conditions for forage species such as shoreline and tributary habitats may be targeted for protection or restoration, thereby promoting sufficient production of forage for predators. Further, quantitative habitat targets or spatial thresholds may be developed for habitat-limited species using estimates of the minimum habitat area required to produce a desired abundance or biomass; such targets or thresholds may serve as spatial reference points for management.

scholarly journals Sea pens in the Mediterranean Sea: habitat suitability and opportunities for ecosystem recovery

2018 ◽  
Vol 75 (5) ◽  
pp. 1722-1732 ◽  
Author(s):  
Azzurra Bastari ◽  
Daniela Pica ◽  
Francesco Ferretti ◽  
Fiorenza Micheli ◽  
Carlo Cerrano
Keyword(s):  
Mediterranean Sea ◽  
Habitat Suitability ◽  
Generalized Additive Models ◽  
Additive Models ◽  
Suitable Habitat ◽  
Ecosystem Recovery ◽  
The Mediterranean ◽  
Suitable Habitats ◽  
Vulnerable Habitats ◽  
Available Information

Abstract The aim of this study is to synthesize available information on sea pens in the Mediterranean Sea and fill existing knowledge gaps through modelling of suitable habitat, with the overarching goal of informing strategies for protecting sea pen habitats from trawling impacts and facilitating their recovery. A review spanning the last 30 years was conducted to map the distribution of Mediterranean sea pen species. In the Adriatic Sea, presence–absence data were modelled with generalized additive models (GAMs) to identify potentially suitable habitats for Funiculina quadrangularis, Virgularia mirabilis, and Pennatula spp. Results show that sea pen distribution in the Mediterranean is mainly limited to continental northern shelves. Six species have been recorded throughout the Adriatic basin, where habitat suitability models confirm that its soft bottoms yield favourable conditions for sea pen assemblages. This information can help guide strategies for diminishing and reversing the impacts of bottom trawling on these vulnerable habitats.

scholarly journals Facilitating Adaptive Forest Management under Climate Change: A Spatially Specific Synthesis of 125 Species for Habitat Changes and Assisted Migration over the Eastern United States

Forests ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 989 ◽  
Author(s):  
Louis R. Iverson ◽  
Anantha M. Prasad ◽  
Matthew P. Peters ◽  
Stephen N. Matthews
Keyword(s):  
Climate Change ◽  
United States ◽  
Tree Species ◽  
Habitat Suitability ◽  
Analysis Data ◽  
Suitable Habitat ◽  
Eastern United States ◽  
Data Set ◽  
The Face ◽  
Suitable Habitats

We modeled and combined outputs for 125 tree species for the eastern United States, using habitat suitability and colonization potential models along with an evaluation of adaptation traits. These outputs allowed, for the first time, the compilation of tree species’ current and future potential for each unit of 55 national forests and grasslands and 469 1 × 1 degree grids across the eastern United States. A habitat suitability model, a migration simulation model, and an assessment based on biological and disturbance factors were used with United States Forest Service Forest Inventory and Analysis data to evaluate species potential to migrate or infill naturally into suitable habitats over the next 100 years. We describe a suite of variables, by species, for each unique geographic unit, packaged as summary tables describing current abundance, potential future change in suitable habitat, adaptability, and capability to cope with the changing climate, and colonization likelihood over 100 years. This resulting synthesis and summation effort, culminating over two decades of work, provides a detailed data set that incorporates habitat quality, land cover, and dispersal potential, spatially constrained, for nearly all the tree species of the eastern United States. These tables and maps provide an estimate of potential species trends out 100 years, intended to deliver managers and publics with practical tools to reduce the vast set of decisions before them as they proactively manage tree species in the face of climate change.

scholarly journals Potential habitat connectivity for Malayan gaur (Bos gaurus) in a fragmented forest area in Peninsular Malaysia

2021 ◽  
Vol 42 (3(SI)) ◽  
pp. 798-805
Author(s):  
N.A.T. Ariffin ◽  
◽  
M.A. Mustapha ◽  
T.M. Taher ◽  
N.F. Khodri ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Peninsular Malaysia ◽  
Forest Area ◽  
Suitable Habitat ◽  
Habitat Suitability Model ◽  
Fragmented Forest ◽  
Auc Value ◽  
Bos Gaurus ◽  
Suitable Habitats ◽  
Fragmented Forest Area

Aim: To predict the distribution of suitable habitats for Malayan gaur (Bos gaurus) at a highly fragmented forest area in Peninsular Malaysia and to identify the potential connectivity between suitable habitat patches. Methodology: Maximum entropy (MaxEnt) approach was used to predict the distribution of suitable habitats of the Malayan gaur. Gaur presence-only data and six environmental variables were collated for the habitat suitability modeling, and area under curve (AUC) value was used to estimate the performance of the model. The resulting model was then used to derive a potential connectivity map through least-cost analysis using Corridor Designer toolbox in ArcGIS 10.4. Results: The AUC value of the habitat suitability model was 0.84. Distance from urban areas indicated the highest relative contribution to the model (26.9%), followed by distance from water body (24.2%) land use (18.0%) elevation (14.3%), slope (14.0%) and lithology (2.6%). Predicted suitable habitats for gaur were found mostly in lowland forest areas, especially in the vicinity of rivers within forest reserves. A total of five wildland blocks were derived from the habitat suitability model, and several potential corridor swaths were identified connecting the wildland blocks. Interpretation: The absence of gaur occurrence in suitable habitats suggest that fragmented habitats greatly affected gaur distribution and population. Road network and agricultural lands are the major barriers of gaur movement as they are very sensitive towards disturbances and conflict. Thus, this research proposes potential connectivity at a regional scale for Malayan gaur for use in future planning in conservation, management and development.

scholarly journals Suitable Habitat Modeling of Prehistoric Antelope-like Bovid Duboisia Santeng in Java Island in The Early Pleistocene

2020 ◽  
Author(s):  
Andri Wibowo
Keyword(s):  
River Basin ◽  
Habitat Suitability ◽  
Potential Distribution ◽  
Habitat Modeling ◽  
Early Pleistocene ◽  
Suitable Habitat ◽  
Migration Routes ◽  
Suitable Habitats ◽  
Surrounding Areas ◽  
Asian Mainland

The migration routes have facilitated the distribution of mammals from south east Asian mainland to the Sundaland including Java island in the early Pleistocene. One of species that has migrated through that route is antelope-like bovid Duboisia santeng. In the present study, the potential distribution areas and the suitable habitats of D. santeng have been projected and modeled. The modeled habitat was a forest river basin sizing 302.91 Ha in the central of Java island. The model has classified and reconstructed the habitat suitability ranged from low to high back to Pleistocene. The surrounding areas of forest were mostly classified as medium and low related to the limited tree covers. Most suitable habitats were identified in the middle of forest river basin where the tree covers were presented

Niche modelling of the potential distribution of the Egyptian Vulture Neophron percnopterus during summer and winter in Iran, to identify gaps in protected area coverage

2018 ◽  
Vol 29 (03) ◽  
pp. 423-436 ◽  
Author(s):  
AZITA FARASHI ◽  
MOHAMMAD ALIZADEH-NOUGHANI
Keyword(s):  
Protected Areas ◽  
Species Distribution Modelling ◽  
Iucn Red List ◽  
Suitable Habitat ◽  
Niche Modelling ◽  
Mammal Species ◽  
Egyptian Vulture ◽  
The North ◽  
Neophron Percnopterus ◽  
Suitable Habitats

SummaryAn analysis of the extent of overlap between habitats of the Egyptian Vulture Neophron percnopterus during summer and winter in Iran, and Iranian protected areas, discovered slight overlap between the two. Our study aimed to survey suitable habitats of the Egyptian Vulture during summer and winter in Iran using MaxEnt, a species distribution modelling method, and compare the results with the locations and span of protected areas. Model fitness was assessed using the area under the ROC-plot and True Skill Statistics. We found that habitat suitability in Iran varies for the Egyptian Vulture during summer and winter. Summer visitors are scattered in the north and west of Iran, concentrated along the Zagros and Alborz mountain ranges. Winter visitors and residents are scattered in coastal areas in the south. Habitat protection for winter visitors was the greatest, with 10% of suitable habitat covered, while less than 10% of suitable habitat for residents and summer visitors fell within protected areas. The Egyptian Vulture is categorised as ‘Endangered’ on the IUCN Red List. Different environmental factors influence the suitability of habitat for the species. While some factors such as NDVI and anthropogenic disturbance influence all visitors in a similar way, the effects of others such as elevation and distance from protected areas vary for summer and winter visitors. Since designation of protected areas in Iran is mainly determined by the distribution of mammal species, protection of bird habitats is often overlooked. Suitable habitat for the species should be considered when selecting protected areas in future.

scholarly journals Habitat of the Vulnerable Formosan sambar deerRusa unicolor swinhoiiin Taiwan

Oryx ◽  
2013 ◽  
Vol 48 (2) ◽  
pp. 232-240 ◽  
Author(s):  
Shih-Ching Yen ◽  
Ying Wang ◽  
Heng-You Ou
Keyword(s):  
Habitat Suitability ◽  
Wildlife Conservation ◽  
Population Decline ◽  
Iucn Red List ◽  
Line Transect ◽  
Suitable Habitat ◽  
Mountain Range ◽  
Rule Set ◽  
Sambar Deer ◽  
Niche Factor

AbstractThe sambar deerRusa unicoloris categorized as Vulnerable on the IUCN Red List because of continuous population decline across its native range. In Taiwan the Formosan sambar deerR. unicolor swinhoiiis listed as a protected species under the Wildlife Conservation Act because of human overexploitation. However, its population status remains unclear. We used presence and absence data from line transect and camera-trap surveys to identify key habitat variables and to map potential habitats available to this subspecies in Taiwan. We applied five habitat-suitability models: logistic regression, discriminant analysis, ecological-niche factor analysis, genetic algorithm for rule-set production, and maximum entropy. We then combined the results of all five models into an ensemble-forecasting model to facilitate a more robust prediction. This model indicated the existence of 7,865 km2of suitable habitat for the sambar deer. Distance from roads and elevation were identified as the most important environmental variables for habitat suitability, and deer preferred areas far from roads and > 1,500 m altitude. The results predicted that suitable deer habitat is mainly located in Taiwan's Central Mountain Range and Xue Mountain Range, with c. 70% of this suitable habitat in protected areas. However, the habitat predicted to be suitable is in five areas separated by mountain highways. We recommend that deer habitats close to the highways should be monitored for the future establishment of corridors between Formosan sambar deer sub-populations.

scholarly journals Modeling habitat suitability of the Red-backed Shrike (Lanius collurio) in the Irano-Anatolian biodiversity hotspot

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Sayyad Sheykhi Ilanloo ◽  
Sohrab Ashrafi ◽  
Afshin Alizadeh Shabani
Keyword(s):  
Population Size ◽  
Habitat Suitability ◽  
Anthropogenic Activities ◽  
Important Variable ◽  
Biodiversity Hotspot ◽  
Mean Annual Temperature ◽  
Suitable Habitat ◽  
Suitable Model ◽  
Western Palearctic ◽  
Suitable Habitats

Identifying suitable habitats of species is essential knowledge to conserve them successfully. Human activities causes the reduction of population size and habitat suitability of many species. Red-backed Shrike is a widespread in western Palearctic. However, the population of this specie has declined in its geographical range due to the loss of suitable habitats. Therefore, it is necessary to identify its suitable habitats and factors affecting species habitat suitability and to protect its reduction population size. The aim of the present study was to identify the suitable habitat of the Red-backed Shrike and determine the most important predictors of its suitable habitat in Irano-Anatolian biodiversity hotspot. To achieve this goal, species presence points were first collected and seven environmental variables related to climate, topography and anthropogenic activities, were used to construct the species habitat suitable model. Models were built using five distribution modeling methods: Maxent, GAP, GLM, RF and GBM in sdm package. Then the models were Ensemble from 5 different models and the final model was constructed. The results of this study showed that the most suitable habitats of this species are in the western and northern parts of the area of study. The mean annual temperature with 41% contribution was the most important variable in constructing the habitat suitability model for this specie. In addition, climate variables with 75% contribution were identified as the most important habitat suitability factor for this specie. Also in relation to conservation of the Red-backed Shrike species in the Irano-Anatolian region, it can be stated that the extent of distribution and presence of this specie has been extended to the northern latitudes due to climate change. As a result, the temperature and climate factor should be given special attention in the management of bird habitats in this area. 

Sign in / Sign up

Export Citation Format

Share Document