Effects of habitat loss and fragmentation on amphibians: A review and prospectus

Cushman, Samuel A.

doi:10.1016/j.biocon.2005.09.031

Cited by 1,162 publications

(912 citation statements)

References 89 publications

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“…Hence the reduction of species observed in the monoculture sites compared to the forest in this study. Similar observations were made by (Young et al, 2001;Green, 2003;Cushman, 2006) who revealed that the replacement of natural environments by man-made habitats is one of the major causes of change in population and community structure of amphibians around the world. Humaninduced impacts can influence amphibian population by modifying the physical structure of the habitat, the frequency and distribution of reproductive sites such as streams, lakes and temporary ponds (Metts et al, 2001).…”

Section: Fig 3 Mean Abundance Of Individuals Across Sitessupporting

confidence: 79%

“…cocoa agroecosystems results in habitat loss, degradation, fragmentation and the creation of monoculture habitats which does not support anuran diversity. Habitat loss lowers anuran species diversity by reducing natural habitats (Cushman, 2006), and increasing population isolations (Arens et al, 2007), inbreeding (Anderson et al, 2004), edge effects (Urbina-Cardona et al, 2006) and discontinuity between terrestrial and aquatic habitats (Becker et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cocoa (<i>Theobroma cacao</i>) Plantation Types on the Distribution of Anuran Communities in Ore, Ondo State, Nigeria

Onadeko¹

2016

Journal of Applied Sciences and Environmental Management

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Anuran species diversity and abundance were evaluated in different farming status of cocoa plantation in Ore, Ondo State, Nigeria. Applying the combination of visual encounter survey (VES) and acoustical survey (AES), the different farms surveyed were categorized as; 1) pure cocoa farms with pesticides applied (PCWP); 2) pure cocoa farms without pesticides application; 3) intercropped cocoa farms with pesticides applied (ICWP); and 4) intercropped cocoa farms without pesticides application (ICNP). The surrounding primary/secondary forest (PSFV) was sampled applying the transect method. A mean total of 690±2.6 anurans belonging to 28 species, 14 genera and 9 families were recorded during the study. Out of these, 10, 19, 17, 22 and 26 species were recorded respectively from PCWP, PCNP, ICWP, ICNP and PSFV. The anuran species richness was significantly different between the different cocoa plantation status and the forest sites (F 4, 10 = 20.55, P< 0.01). The highest mean number of individuals (190±9.5) was observed at ICNP followed by PSFV (183±5.7), while the least was at PCWP (77±8.0). There was also significant difference (F 4, 10 = 150.48, P< 0.01) between the abundance of anuran species at the various sites. Diversity indices (Shannon and Margalef) showed that the forest sites had the greatest (3.204 and 4.799) respectively while the pesticide using pure cocoa farms had the least (1.853 and 2.072). Generally, the result of the study clearly indicated that pesticide use cocoa farms were significantly lower compared to other sites. Farmers are encouraged to engage in intercropping (polyculture) especially with food and economic crops in a biodiversity friendly manner which could have similar characteristics of a natural ecosystem, thereby enhancing the biological diversity of agro-ecosystems. © JASEM http://dx.doi.org/10.4314/jasem.v20i1.2

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Section: Fig 3 Mean Abundance Of Individuals Across Sitessupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Effect of Cocoa (<i>Theobroma cacao</i>) Plantation Types on the Distribution of Anuran Communities in Ore, Ondo State, Nigeria

Onadeko¹

2016

Journal of Applied Sciences and Environmental Management

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“…One of the main impacts of fragmentation is limiting species movement between patches of suitable habitat, due to the presence of a hostile landscape matrix that generates isolation (Weinsheimer et al, 2010). Previous studies show the negative impact of fragmentation on the persistence of amphibian populations by limiting their ability to disperse (Funk et al, 2005) and increasing demographic stochasticity (Cushman, 2006). The effects of the agroforestry expansion on the fragmentation of M. sanmartini habitat are still unknown.…”

Section: Discussionmentioning

confidence: 99%

Climate and land-use changes effects on the distribution of a regional endemism: Melanophryniscus sanmartini (Amphibia, Bufonidae)

Rosenstock

Toranza

Brazeiro

2015

Iheringia, Sér. Zool.

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ABSTRACT. Amphibians are the most threatened vertebrate group according to the IUCN. Land-use and land cover change (LULCC) and climate change (CC) are two of the main factors related to declining amphibian populations. Given the vulnerability of threatened and rare species, the study of their response to these impacts is a conservation priority. The aim of this work was to analyze the combined impact of LULCC and CC on the regionally endemic species Melanophryniscus sanmartini Klappenbach, 1968. This species is currently categorized as near threatened by the IUCN, and previous studies suggest negative effects of projected changes in climate. Using maximum entropy methods we modeled the effects of CC on the current and mid-century distribution of M. sanmartini under two IPCC scenarios -A2 (severe) and B2 (moderate). The effects of LULCC were studied by superimposing the potential distribution with current land use, while future distribution models were evaluated under the scenario of maximum expansion of soybean and afforestation in Uruguay. The results suggest that M. sanmartini is distributed in eastern Uruguay and the south of Brazil, mainly related to hilly and grasslands systems. Currently more than 10% of this species' distribution is superimposed by agricultural crops and exotic forest plantations. Contrasting with a recent modelling study our models suggest an expansion of the distribution of M. sanmartini by mid-century under both climate scenarios. However, despite the rise in climatically suitable areas for the species in the future, LULCC projections indicate that the proportion of modified habitats will occupy up to 25% of the distribution of M. sanmartini. Future change in climate conditions could represent an opportunity for M. sanmartini, but management measures are needed to mitigate the effects of habitat modification in order to ensure its survival and allow the eventual expansion of its distribution.KEYWORDS. Species distribution modeling, global change, conservation, threatened species. RESUMEN. Efectos de los cambios climáticos y del uso de la tierra en la distribución de un endemismo regional: Melanophryniscus sanmartini (Amphibia, Bufonidae). Los anfibios son el grupo de vertebrados más amenazado en la actualidad según la UICN. El cambio en el uso y cobertura del suelo (CUCS) y el cambio climático (CC) son dos de los principales factores involucrados en el fenómeno de declinación de anfibios. Por lo tanto, investigar sus impactos sobre especies amenazadas o raras es fundamental dado que su vulnerabilidad las convierte en prioridades de conservación. El objetivo de este trabajo fue evaluar conjuntamente el impacto potencial del CUCS y del CC sobre la distribución del endemismo regional Melanophryniscus sanmartini Klappenbach, 1968. Esta especie está categorizada como casi amenazada por UICN y estudios anteriores sugieren efectos negativos del CC en su distribución. Utilizando modelos de máxima entropía modelamos la distribución actual y futura (2050) de M. sanmartini, bajo dos escenarios d...

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“…Deforestation and habitat fragmentation are two of the main reasons for declines in herpetofaunal species [114,155]. Fragmenting natural habitats alters the shape, size, and arrangement of habitat types, which in turn may exacerbate local extinction rates and impact dispersal patterns.…”

Section: Habitat Loss and Fragmentationmentioning

confidence: 99%

“…Fragmenting natural habitats alters the shape, size, and arrangement of habitat types, which in turn may exacerbate local extinction rates and impact dispersal patterns. Habitat fragmentation can act as a barrier that separates subpopulations [155,156]. Because their populations are both spatially and temporally dynamic, amphibians may be particularly prone to local extinction events.…”

Section: Habitat Loss and Fragmentationmentioning

confidence: 99%

Environmental and Anthropogenic Factors Influencing Salamanders in Riparian Forests: A Review

Clipp

Anderson

2014

Forests

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Salamanders and riparian forests are intimately interconnected. Salamanders are integral to ecosystem functions, contributing to vertebrate biomass and complex food webs in riparian forests. In turn, these forests are critical ecosystems that perform many environmental services, facilitate high biodiversity and species richness, and provide habitat to salamander populations. Due to the global decline of amphibians, it is important to understand, as thoroughly and holistically as possible, the roles of environmental parameters and the impact of human activities on salamander abundance and diversity in riparian forests. To determine the population responses of salamanders to a variety of environmental factors and anthropogenic activities, we conducted a review of published literature that compared salamander abundance and diversity, and then summarized and synthesized the data into general patterns. We identify stream quality, leaf litter and woody debris, riparian buffer width, and soil characteristics as major environmental factors influencing salamander populations in riparian forests, describe and explain salamander responses to those factors, and discuss the effects of anthropogenic activities such as timber harvest, prescribed fires, urbanization, road construction, and habitat fragmentation. This review can assist land and natural resource managers in anticipating the consequences of human activities and preparing strategic conservation plans. OPEN ACCESSForests 2014, 5 2680

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Effects of habitat loss and fragmentation on amphibians: A review and prospectus

Cited by 1,162 publications

References 89 publications

Effect of Cocoa (<i>Theobroma cacao</i>) Plantation Types on the Distribution of Anuran Communities in Ore, Ondo State, Nigeria

Effect of Cocoa (<i>Theobroma cacao</i>) Plantation Types on the Distribution of Anuran Communities in Ore, Ondo State, Nigeria

Climate and land-use changes effects on the distribution of a regional endemism: Melanophryniscus sanmartini (Amphibia, Bufonidae)

Environmental and Anthropogenic Factors Influencing Salamanders in Riparian Forests: A Review

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