How to measure the urban‐wildland ecotone: redefining ‘peri‐urban’ areas

MacGregor-Fors, Ian

doi:10.1007/s11284-010-0717-z

Cited by 64 publications

(36 citation statements)

References 18 publications

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“…This suggests that larger areas that are connected with the non-urban matrix can offer an important array of resources. Thus, by providing supplementary or complementary resources that may compensate for limited resource availability in greenspaces, they could allow the influx of individuals from the non-urban matrix, and enable the temporal establishment of populations of species of moderate sensibility to urbanization [64][65][66]. It is noteworthy to state that both Natura and Santuario have native ecosystem remnants and/or elements, which could be also driving our species richness results.…”

Section: Discussionmentioning

confidence: 89%

“…This result could be given by the low species richness recorded in the studied greenspaces (average of about three to nine species per greenspace), which could be a result of the semi-permeable filtering of species from the non-urban matrix [9,65]. This was particularly true for copro-necrophagous beetles, amphibians, and bats, with contrastingly different assemblages in large peri-urban greenspaces.…”

Section: Discussionmentioning

confidence: 90%

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City “Green” Contributions: The Role of Urban Greenspaces as Reservoirs for Biodiversity

MacGregor-Fors

Escobar

Rueda‐Hernández

et al. 2016

Forests

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Urbanization poses important environmental, social, and ecological pressures, representing a major threat to biodiversity. However, urban areas are highly heterogeneous, with some greenspaces (e.g., urban forests, parks, private gardens) providing resources and a refuge for wildlife communities. In this study we surveyed 10 taxonomic groups to assess their species richness and composition in six greenspaces that differ in size, location, management, and human activities. Species richness differed among taxonomic groups, but not all differed statistically among the studied greenspaces (i.e., sac fungi, bats). Plants, basidiomycetous and sac fungi, and birds showed intermediate assemblage composition similarity (<54%). The composition of assemblages of copro-necrophagous beetles, grasshoppers, amphibians, and bats was related to the specific traits of greenspaces, mainly size and location. The species richness contribution of each greenspace considering all studied taxonomic groups was highest in the largest greenspace that is located at the southeastern border of the city, while the lowest contribution was recorded in the smallest ones, all of them closer to the city's center. Our results shed some light on the way in which different taxonomic groups respond to an array of neotropical urban greenspaces, providing an important basis for future studies.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 90%

City “Green” Contributions: The Role of Urban Greenspaces as Reservoirs for Biodiversity

MacGregor-Fors

Escobar

Rueda‐Hernández

et al. 2016

Forests

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“…We established a ~50% built cover threshold to differentiate between sites with low and high urbanization, i.e., 0-50% = low urbanization; 51-100% = high urbanization. To distinguish between intra-and peri-urban areas, we used methods to delineate the limit of the peri-urban area of an urban agglomeration (MacGregor-Fors 2010). Briefly, this method calculates the representative area in which the urban core intermingles with adjacent nonurban systems, representing an ecologically meaningful ecotone for birds (Puga-Caballero et al 2014).…”

Section: Focal Land Classes Within Urban-agricultural Landscapesmentioning

confidence: 99%

Space invaders: House Sparrow densities along three urban-agricultural landscapes

MacGregor-Fors

Quesada²,

Lee

et al. 2017

ACE

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ABSTRACT. One of the most successful avian urban invaders is the House Sparrow (Passer domesticus). Here, we examine House Sparrow numbers in the urban-agricultural landscape of three cities, one where the sparrow is native (Barcelona) and two where it is nonnative (Los Angeles, Mexico City), comparing between five different land classes based on land-use, location relative to urban center, and urbanization intensity. We estimated sparrow densities using distance-sampling corrected procedures and compared sparrow numbers between the three cities and between the land classes within each city. This two-year survey showed the highest density of sparrows occurring in Mexico City and the lowest in Los Angeles. In both cities where the sparrow is nonnative, we recorded the greatest abundances in highly urbanized areas. In Barcelona, where the sparrow is native, abundances did not differ among land classes. We also related sparrow numbers to specific environmental variables, describing vegetation structure, urban infrastructure, and human activity, using classification and regression trees. We found several variables related to differences in House Sparrow abundances among the three cities. For Los Angeles and Mexico City, the most important variables explaining House Sparrow numbers were urban infrastructure (i.e., maximum building height, high urbanization) and/or human activity (i.e., pedestrians), all of which related positively with sparrow abundance. For Barcelona, sparrow numbers showed both positive and negative relationships with vegetation (i.e., tree abundance, maximum tree height, maximum herbaceous plant height) and human-related variables (i.e., cars, pedestrians). Although the scope of this study is geographically limited to three cities, our results suggest that House Sparrow numbers between cities and land classes areas vary considerably, and are likely determined by a complex array of variables. Our study provides some insight to the growth and decline of House Sparrow populations in their nonnative and native ranges, respectively. Alerte aux envahisseurs: Densités de moineaux domestiques au long de trois paysages agrico-urbainsRÉSUMÉ. Un des envahisseurs aviaires ayant le plus de succès est le Moineau Domestique (Passer domesticus). Ici, nous examinons les densités dans les zones agrico-urbaines de trois villes, une où le moineau est natif (Barcelone) et deux où l'espèce est considérée envahissante (Los Angeles, Mexico), en comparant entre cinq classifications terrestres établit selon l'utilisation du territoire, localisation relative au centre urbain, et l'intensité d'urbanisation. Nous avons estimé les densités de moineaux en utilisant la méthode d'échantillonnage selon la distance corrigée et avons comparé le nombre de moineau entre les trois villes, ainsi qu'entre les classifications terrestres dans chaque ville. Cet échantillonnage de deux ans a démontré la plus grande densité à Mexico et la plus basse à Los Angeles. Chez les deux villes où le moineau est considéré comme envahissant, les densité...

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“…En la última década se han generado, sobre México, estudios de ecología urbana que sustentan cambios en la composición, estructura y funcionamiento de la avifauna, los cuales son atribuidos a los humanos que modifican el hábitat de la avifauna (Ortega-Ál-varez y MacGregor- Fors 2009, MacGregor-Fors et al 2009, 2010, Chávez-Zichinelli et al 2010, Ortega-Álvarez y MacGregor-Fors 2011, Rodríguez-Ruíz et al 2011, Villegas-Patraca et al 2012, Malagamba-Rubio et al 2013, Chávez-Zichinelli et al 2013 Rodríguez-Ruiz et al…”

Section: Discussionunclassified

Translocación de la urraca-hermosa cara negra Calocitta colliei (Passeriformes: Corvidae) a Ciudad Victoria, Tamaulipas, México

Rodríguez-Ruiz

Hernández-Jasso

Drouaillet

et al. 2017

Huitzil Rev. Mex. Ornitol.

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ResumenAunque la expansión del área de distribución de las especies ocurre naturalmente, la translocación ejercida por el humano puede resultar en una amenaza para otras especies. En este estudio hacemos referencia a los primeros registros de Calocitta colliei en Ciudad Victoria, Tamaulipas, noreste de México. La presencia de esta especie podría obedecer al traslado en cautiverio, liberación o escape y permanencia en la zona. Los registros fueron obtenidos de forma ocasional del 2009 al 2015. La incidencia de individuos de C. colliei en el área urbana hace suponer que existe una asociación positiva de tipo comensal con el humano, donde la especie se adapta al área urbana local, preferentemente en áreas de perturbación intermedia, entre densidad humana y área verde urbana con presencia de árboles frutales exóticos. Esto puede funcionar como una barrera ecológica que la aísla del entorno natural. Sugerimos medidas de prevención a escala local, además de generar información base sobre la distribución de C. colliei para evaluar sus efectos sobre especies nativas a corto plazo (competencia, desplazamiento y otras interacciones ecológicas), y preferencias del hábitat dentro de áreas urbanas con el fin de diseñar planes de manejo y programas de educación ambiental en la región.Palabras clave: Ave de ornato, especie introducida, distribución, competencia, translocación, cautiverio. AbstractAlthough the expansion of the distributional range of species occurs naturally, translocation exerted by the humans may result in a threat to other species. In this study, we report the first records of the black-throated magpie-jay (Calocitta colliei) in Ciudad Victoria, Tamaulipas, northeastern Mexico whose presence may be due to the transfer in captivity, release or escape and permanence in the area. Records were obtained occasionally from 2009 to 2015. The incidence of C. colliei individuals in urban areas assumes a positive association of commensalism with humans, in which the species adapts to the local urban area, preferably in areas of intermediate disturbance between human density and green areas with exotic fruit trees. This may act as an ecological barrier that isolates the species from the natural environment. We suggest taking action on preventive measures at the local scale, and generating basic information on the distribution of C. colliei for assessing short-term effects on native species (competition, displacement and other ecological interactions) and habitat preferences in urban areas, to design management plans and environmental education programs in the region.

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How to measure the urban‐wildland ecotone: redefining ‘peri‐urban’ areas

Cited by 64 publications

References 18 publications

City “Green” Contributions: The Role of Urban Greenspaces as Reservoirs for Biodiversity

City “Green” Contributions: The Role of Urban Greenspaces as Reservoirs for Biodiversity

Space invaders: House Sparrow densities along three urban-agricultural landscapes

Translocación de la urraca-hermosa cara negra Calocitta colliei (Passeriformes: Corvidae) a Ciudad Victoria, Tamaulipas, México

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