scholarly journals Inverse edge effect on nest predation in a Kenyan forest fragment: an experimental case study

2009 ◽  
Vol 19 (04) ◽  
pp. 367 ◽  
Author(s):  
TOON SPANHOVE ◽  
VALÉRIE LEHOUCK ◽  
LUC LENS
Keyword(s):  
Edge Effect ◽  
Nest Predation ◽  
Forest Fragment

scholarly journals The effects of forest edge and nest height on nest predation in a U.K. deciduous forest fragment

2020 ◽  
Author(s):  
Noah Atkin ◽  
Cris Banks-Leite
Keyword(s):  
Edge Effect ◽  
Nest Predation ◽  
Deciduous Forest ◽  
Forest Edge ◽  
Forest Edges ◽  
Forest Fragment ◽  
Artificial Nests ◽  
Conservation Implications ◽  
Mixed Deciduous Forest ◽  
Nest Height

It has been previously hypothesised that nest predation is higher at forest edges. This has important conservation implications for the increasingly fragmented U.K. climax community. I aimed to test the generality of this edge effect in a mixed deciduous forest fragment which borders open grassland. Artificial nests containing a combination of quail and plasticine eggs were used, at ground and arboreal levels. I found an overall edge effect on nest predation rates, however this effect was not specifically seen in ground nests. Ground nests experienced significantly higher levels of predation than arboreal nests. I suggest this edge effect is due in part to the steep productivity gradient over the ecotone.

scholarly journals Evidence for an Edge Effect on Avian Nest Predation in Fragmented Afromontane Forests in the Bamenda-Banso Highlands, NW Cameroon

2014 ◽  
Vol 7 (4) ◽  
pp. 720-732 ◽  
Author(s):  
Ondřej Sedláček ◽  
Martin Mikeš ◽  
Tomáš Albrecht ◽  
Jiří Reif ◽  
David Hořák
Keyword(s):  
Edge Effect ◽  
Nest Predation ◽  
Afromontane Forests ◽  
Avian Nest

scholarly journals Dynamics and Edge Effect of an Atlantic Forest Fragment in Brazil

2016 ◽  
Vol 23 (3) ◽  
pp. 340-349 ◽  
Author(s):  
Poliana Gabriella Araújo Mendes ◽  
Maria Amanda Menezes Silva ◽  
Tassiane Novacosque Feitosa Guerra ◽  
Ana Carolina Borges Lins-e-Silva ◽  
Airton de Deus Cysneiros Cavalcanti ◽  
...  
Keyword(s):  
Species Richness ◽  
Atlantic Forest ◽  
Edge Effect ◽  
Woody Plants ◽  
Response Times ◽  
Forest Edge ◽  
Northeastern Brazil ◽  
Forest Fragment ◽  
Canopy Tree ◽  
Forest Interior

ABSTRACT The woody plants in an edge area formed approximately 35 years ago in an Atlantic Forest fragment in northeastern Brazil were examined, and three environments defined: edge, intermediate, and interior. Canopy tree densities and basal areas were found to be similar in all three environments, and also similar to previous published studies in the same region; species richness was greatest at the forest edge. The understory showed greater species richness in the forest interior, but greater diversity and equitability in the intermediate environment. Understory environments close to the forest edge demonstrated larger stem diameters than in the forest interior, although at lesser densities and with smaller total basal areas. Our results indicated the existence of distinct patterns in canopy and understory that most likely reflect differences in the response times of these two vegetation layers, with the understory being more sensitive to alterations in environmental structure.

scholarly journals Fertilidade do solo como indicador do efeito de borda em fragmento florestal, Vitória da Conquista, Bahia

2016 ◽  
Vol 11 (4) ◽  
pp. 185
Author(s):  
Danilo Brito Novais ◽  
Joilson Silva Ferreira ◽  
Patrícia Anjos Bittencourt Barreto
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Soil Fertility ◽  
Edge Effect ◽  
Base Saturation ◽  
Forest Fragment ◽  
Chemical Attributes ◽  
The One ◽  
Composite Samples

Com a expansão da agricultura as florestas têm sido fragmentadas, modificando a dinâmica dos seus processos refletindo na fertilidade do solo. Esse estudo teve como objetivo avaliar o efeito de borda na fertilidade do solo em um fragmento florestal na região Sudoeste da Bahia. Para isso a área foi dividida em faixas verticais iniciando 50 metros após a borda, adentrando até 300 metros no fragmento. Em cada uma das faixas foram tomadas 3 amostras compostas nas profundidades de 0-5, 5-10, 10-20 cm. Analisando os atributos químico e calculando a soma de bases, CTC a pH7 e a saturação por bases (V%). Também foram quantificados os teores de carbono orgânico (COT) nas áreas de estudo. Foram observadas diferenças na fertilidade do solo da borda para o interior do fragmento.  Verificou-se que os atributos Ca2+, H++Al3+, S, T, COT foram os mais sensíveis em relação ao efeito de borda. A área semi-interna (SI) distando 150-200 metros, de maneira geral foi a que apresentou os maiores valores de fertilidade do solo, possivelmente devido aos maiores teores de matéria orgânica acumulada.  Soil fertility as edge effect indicator in a forest fragment, Vitória da Conquista, BahiaAbstract: With the expansion of agriculture forests have been fragmented, changing the dynamics of their processes reflecting soil fertility. This study aimed to evaluate the edge effect on soil fertility in a forest fragment in the Southwest Bahia region. For this area was divided into vertical strips starting 50 meters after the border, entering up to 300 meters in the fragment. In each of the tracks were taken 3 composite samples at depths of 0-5, 5-10, 10-20 cm. Analyzing the chemical attributes and calculating the sum of bases, CTC at pH 7 and base saturation (V%). Also the organic carbon levels were quantified (COT) in the study areas. Differences were observed at the edge of soil fertility into the fragment. It was found that attributes, Ca2+, H++Al3+, S, T, COT were the most sensitive in relation to the edge effect. The semi-internal area (SI) 150-200 meters distant in general was the one with the highest soil fertility values, possibly due to higher levels of accumulated organic matter.

scholarly journals HYDRO-MICROBIOLOGICAL ATTRIBUTES OF THE SOIL IN EDGE OF SEASONAL SEMIDECIDUOUS FOREST FRAGMENT

2020 ◽  
Vol 7 (1) ◽  
pp. 18-24
Author(s):  
Karolayne Lemes D'Abadia ◽  
Ane Gabriele Vaz Souza ◽  
Gabriela Gomes da Silva Gomes da Silva ◽  
Murilo Silva Machado ◽  
Vagner Santiago do Vale Santiago do Vale ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Edge Effect ◽  
Rainy Season ◽  
Microbial Biomass Carbon ◽  
Basal Respiration ◽  
Metabolic Efficiency ◽  
Forest Fragment ◽  
Semideciduous Forest ◽  
Carbon Release ◽  
Seasonal Semideciduous Forest

Native forests have been suffering changes, such as fragmentation and edge effect, and these have implications for the dynamics of carbon within the same fragment, differentiating vegetation and soil. In this way, the work aimed to evaluate the hydro-microbiological attributes of the soil in rainy and dry periods, as well as to indicate if there is an edge effect in a seasonal semideciduous forest fragment. The study was carried out in a forest fragment in the area of the State University of Goiás, Ipameri Campus, consisting of three transects divided into three blocks from the edge. Sampling was performed in two periods of the year, rainy and dry, to determine the gravimetric soil water content (UG), microbial biomass carbon (MBC), basal respiration (BR), and the metabolic quotient (qCO2). The data were subjected to analysis of variance (F test), and when significant, the means were evaluated by the Tukey test at 5% probability. Response variations of microorganisms are closely related to the periods studied; the rainy season benefits the carbon incorporation activity, and the dry season stimulates the carbon release. Consequently, metabolic efficiency is more pronounced in the rainy season. The edge of the fragment only influenced the MBC, evidencing that disturbances caused at the extremity of fragment interfere with the C input in the microbial biomass.

Bird nest predation in a southern Tunisian oasis habitat: No evidence of “edge effect”

2009 ◽  
Vol 35 (2) ◽  
pp. 174-181 ◽  
Author(s):  
Jihen Boukhriss ◽  
Slaheddine Selmi ◽  
Saïd Nouira
Keyword(s):  
Edge Effect ◽  
Nest Predation ◽  
Bird Nest

scholarly journals Nesting associations between Chartergus globiventris Saussure (Hymenoptera: Vespidae) and Tolmomyias sulphurescens Spix (Passeriformes: Tyrannidae) in southeastern Brazil

2017 ◽  
Vol 10 (1) ◽  
pp. 51-53 ◽  
Author(s):  
Marcos Magalhães Souza ◽  
Ângela Gomes Brunismann ◽  
Epifânio Porfiro Pires
Keyword(s):  
Nest Predation ◽  
Social Wasp ◽  
Social Wasps ◽  
Southeastern Brazil ◽  
Nest Construction ◽  
Forest Fragment ◽  
The Social ◽  
De Se ◽  
Potential Benefits ◽  
First Time

Abstract. The success of social wasps is highly dependent on nest construction and colony maintenance. Species use different strategies to avoid nest predation, including forming associations with other insects and vertebrates. This study describes for the first time the association between the social wasp Chartergus globiventris Saussure and the yellow-olive flycatcher Tolmomyias sulphurescens Spix in a deciduous seasonal forest fragment in southeastern Brazil. We located eight active C. globiventris colonies in the study site, three of which were associated with active T. sulphurescens nests. Bird-wasp associations in previous studies have been regarded as commensalism because only birds seem to benefit. However, further studies are needed to better understand the potential benefits of this relationship for both taxa.Associações de nidificação entre Chartergus globiventris Saussure (Hymenoptera: Vespidae) e Tolmomyias sulphurescens Spix (Passeriformes: Tyrannidae) no sudeste do BrasilResumo. O sucesso das espécies de vespas sociais está relacionado tanto a construção quanto a manutenção das colônias. Várias espécies utilizam de diversas estratégias para evitar a predação de seus ninhos, como a associação com outros insetos e vertebrados. O presente estudo descreve o primeiro registro da associação da vespa social Chartergus globiventris Saussure com a ave Tolmomyias sulphurescens Spix em fragmento de Floresta Estacional Decidual no Sudeste do Brasil. Foram registradas oito colônias de C. globiventris ativas em diferentes espécies arbóreas, das quais três estavam associadas a ninhos ativos de T. sulphurescens. A associação entre a ave e a vespa tem sido tratada como comensalismo, pois apenas a ave obtém vantagens aparente, como discutido na literatura. Contudo, é necessário realizar experimentações ou análises mais aprofundadas a fim de se obter afirmações sobre os benefícios dessa relação.</p

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.

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