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Papers by Patricia Koleff

Beta-diversity is a term used to refer to the heterogeneity in the composition of species through... more Beta-diversity is a term used to refer to the heterogeneity in the composition of species through space or time. Despite a consensus on the advantages of measuring β-diversity using data on species abundances through Hill numbers, we still lack a measure of temporal β-diversity based on this framework. In this paper, we present the mathematical basis for a temporal β-diversity measure, based on both signal processing and Hill numbers theory through the partition of temporal ƴ-diversity. The proposed measure was tested in four hypothetical simulated communities with species varying in temporal concurrence and abundance and two empirical data sets. The values of each simulation reflected community heterogeneity and changes in abundance over time. In terms of ƴ-diversity,q-values are closely related to total richness (S) and show a negative exponential pattern when they increase. For α-diversity,q-value profiles were more variable than ƴ-diversity, and different decaying patterns in α-...

PLOS ONE

The Baja California Pacific Islands (BCPI) is a seabird hotspot in the southern California Curren... more The Baja California Pacific Islands (BCPI) is a seabird hotspot in the southern California Current System supporting 129 seabird breeding populations of 23 species and over one million birds annually. These islands had a history of environmental degradation because of invasive alien species, human disturbance, and contaminants that caused the extirpation of 27 seabird populations. Most of the invasive mammals have been eradicated and colonies have been restored with social attraction techniques. We have recorded the number of breeding pairs annually for most of the colonies since 2008. To assess population trends, we analyzed these data and show results for 19 seabird species on ten island groups. The maximum number of breeding pairs for each nesting season was used to estimate the population growth rate (λ) for each species at every island colony. We performed a moving block bootstrap analysis to assess whether seabird breeding populations are increasing or decreasing. San Benito, ...

Restoration Ecology, Apr 3, 2022

Environmental restoration success depends on the involvement of local communities, from the co‐de... more Environmental restoration success depends on the involvement of local communities, from the co‐design of projects to their execution and follow‐up. Nonetheless, community‐based restoration has been poorly assessed and is frequently not incorporated into planning of institutional programs. Based on an online questionnaire addressing rural and indigenous communities involved in restoration projects across Mexico, we explored the local perceptions of restoration efforts, the main characteristics of actors' responsibilities in projects, benefits, and limitations of activities, and recommendations for performing community‐based programs. Results showed that communities have an active participation from the assessment of goals to implementation of activities. Restoration is an important activity to generate revenues, recover the use of natural resources, and foster conservation. Most projects considered local knowledge, but were performed for a short term and constrained by funding. Restoration activities mainly focused on vegetation recovery, while animals were widely used for monitoring progress of actions. Our results suggest that communities are no longer involved as mere labor forces, but have an active role as critical decision makers in all process stages and in providing recommendations to enhance joint efforts with other stakeholders. Still, according to the literature review of Mexican restoration projects that contextualized our findings, less than 6% of the publications reported the incorporation of communities into restoration projects. This highlights the relevance of our work to portray community‐restoration and emphasizes the importance to promote collective responses to sustainably manage natural resources, while strengthening a collaborative restoration agenda with communities, which is critical to enhance restoration success worldwide.

Biodiversity Information Science and Standards, Jul 17, 2019

PLANTS, PEOPLE, PLANET, 2021

Societal Impact StatementCrop wild relatives (CWR) are plant taxa closely related to crops and ar... more Societal Impact StatementCrop wild relatives (CWR) are plant taxa closely related to crops and are a source of high genetic diversity that can help adapt crops to the impacts of global change, particularly to meet increasing consumer demand in the face of the climate crisis. CWR provide vital ecosystem services and are increasingly important for food and nutrition security and sustainable and resilient agriculture. They therefore are of major biological, social, cultural and economic importance. Assessing the extinction risk of CWR is essential to prioritise in situ and ex situ conservation strategies in Mesoamerica to guarantee the long‐term survival and availability of these resources for present and future generations worldwide.Summary Ensuring food security is one of the world's most critical issues as agricultural systems are already being impacted by global change. Crop wild relatives (CWR)—wild plants related to crops—possess genetic variability that can help adapt agricu...

127, 2006

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 ... more 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 ... ANÁLISIS DE VACÍOS Y OMISIONES EN CONSERVACIÓN EN MÉXICO ... Autores responsables del capítulo: Patricia Koleff 1 , Marcia Tambutti 1 , ...

Journal of Biogeography, May 1, 2004

Global Ecology and Biogeography, Sep 1, 2002

... PATRICIA KOLEFF and KEVIN J. GASTON ... being determined between spatial units that may be sm... more ... PATRICIA KOLEFF and KEVIN J. GASTON ... being determined between spatial units that may be small or large in area, and may be relatively homogeneous in habitat or very heterogeneous (eg Harrison et al., 1992; Blackburn & Gaston, 1996; Gregory et al., 1998; Lennon et al ...

Ecology Letters, Nov 27, 2003

Journal of Animal Ecology, Nov 1, 2001

Journal of Animal Ecology, May 1, 2003

Global Ecology and Biogeography, Oct 17, 2003

ABSTRACTAim To examine the effect on the observed relationship between spatial turnover and lati... more ABSTRACTAim To examine the effect on the observed relationship between spatial turnover and latitude of both the measure of beta diversity used and the method of analysis.Location The empirical analyses presented herein are for the New World.Methods We take the spatial distributions of the owls of the New World as an exemplar data set to investigate the patterns of beta diversity across latitudes revealed by different analytical methods. To illustrate the strengths and weaknesses of alternative measures of beta diversity and different analytical approaches, we also use a simple random distribution model, focusing in particular on the influence of richness gradients and landmass geometry.Results Our simple spatial model of turnover demonstrates that different combinations of analytical approach and measure of beta diversity can give rise to strikingly different relationships between turnover and latitude. The analyses of the bird data for the owls of the New World demonstrate that this observation extends to real data.Conclusions For the particular assemblage considered, we present strong evidence that species richness declines at higher latitudes, and there is also some evidence that species turnover is greater nearer the equator, despite conceptual and practical difficulties involved in analysing spatial patterns of species turnover. We suggest some ways of overcoming these difficulties.

Ciencia y desarrollo, 2010

Ecography, Jun 1, 2001

Mid‐domain models have been argued to provide a default explanation for the best known spatial pa... more Mid‐domain models have been argued to provide a default explanation for the best known spatial pattern in biodiversity, namely the latitudinal gradient in species richness. These models assume no environmental gradients, but merely a random latitudinal association between the size and placement of the geographic ranges of species. A mid‐domain peak in richness is generated because when the latitudinal extents of species in a given taxonomic group are bounded to north and south, perhaps by a physical constraint such as a continental edge or perhaps by a climatic constraint such as a critical temperature or precipitation threshold, then the number of ways in which ranges can be distributed changes systematically between the bounds. In addition, such models make predictions about latitudinal variation in the latitudinal extents of the distributions of species, and in beta diversity (the spatial turnover in species identities). Here we test how well five mid‐domain models predict observed latitudinal patterns of species richness, latitudinal extent and beta diversity in two groups of birds, parrots and woodpeckers, across the New World. Whilst both groups exhibit clear gradients in richness and beta diversity and the general trend in species richness is acceptably predicted (but not accurately, unless substantial empirical information is assumed), the fit of these models is uniformly poor for beta diversity and latitudinal range extent. This suggests either that, at least for these data, as presently formulated mid‐domain models are too simplistic, or that in practice the mid‐domain effect is not significant in determining geographical variation in diversity.

This synopsis has been produced to highlight the core aspects of the first three volumes of Natur... more This synopsis has been produced to highlight the core aspects of the first three volumes of Natural Capital of Mexico, which gives us an overview to identify priorities for future attention, new research areas and options for the conservation and sustainable management of biodiversity in Mexico. The synopsis provides a significant amount of supporting information which, within a conceptual framework can be adopted by different orders of government to help define public policies with an appropriate balance between two key axes in order to progress toward sustainability: the social welfare of Mexicans and best management practices and conservation of Mexico's natural heritage. The framework used was based in part on the "Millennium Ecosystem Assessment", but was adapted to the particular circumstances and characteristics of Mexico.