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White JG, Sparrius J, Robinson T, Hale S, Lupone L, Healey T, Cooke R, Rendall AR. Can NDVI identify drought refugia for mammals and birds in mesic landscapes? THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158318. [PMID: 36037901 DOI: 10.1016/j.scitotenv.2022.158318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/23/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Refugia within landscapes are increasingly important as climate change intensifies, yet identifying refugia, and how they respond to climatic perturbations remains understudied. We use Normalized Difference Vegetation Index (NDVI) developed during extreme drought to identify drought refugia. We then utilise camera trapping to understand the ecological role and importance of these refugia under fluctuating rainfall conditions. Ground foraging mammals and birds were surveyed annually from 2016 to 2019 whereby 171 remote-sensing cameras were deployed in the southern section of the Grampians, Australia. NDVI values were calculated during Australia's millennium drought, allowing the assessment of how NDVI calculated during extreme drought predicts drought refugia and the response of biodiversity to NDVI under rainfall fluctuations. Site occupancy of bird and mammal assemblages were dependent on NDVI, with areas of high NDVI during drought exhibiting characteristics consistent with refugia. Rainfall pulses increased site occupancy at all sites with colonisation probability initially associated with higher NDVI sites. Extinction probabilities were greatest at low NDVI sites when rainfall declined. Within mesic systems, remotely sensed NDVI can identify areas of the landscape that act as drought refugia enabling landscape management to prioritise species conservation within these areas. The protection and persistence of refugia is crucial in ensuring landscapes and their species communities therein are resilient to a range of climate change scenarios.
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Affiliation(s)
- John G White
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia.
| | - Jacinta Sparrius
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
| | - Tomas Robinson
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
| | - Susannah Hale
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
| | - Luke Lupone
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
| | - Tom Healey
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
| | - Raylene Cooke
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
| | - Anthony R Rendall
- Deakin University, Geelong, School of Life and Environmental Sciences, Faculty of Science, Engineering and the Built Environment, 221 Burwood Hwy, Burwood 3125, VIC, Australia
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Hansen NA, Scheele BC, Driscoll DA, Lindenmayer DB. Amphibians in agricultural landscapes: the habitat value of crop areas, linear plantings and remnant woodland patches. Anim Conserv 2018. [DOI: 10.1111/acv.12437] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- N. A. Hansen
- Fenner School of Environmental and Society The Australian National University Acton ACT Australia
| | - B. C. Scheele
- Fenner School of Environmental and Society The Australian National University Acton ACT Australia
| | - D. A. Driscoll
- School of Life and Environmental Sciences Deakin University Melbourne Vic Australia
| | - D. B. Lindenmayer
- Fenner School of Environmental and Society The Australian National University Acton ACT Australia
- Sustainable Farms, Fenner School of Environmental and Society The Australian National University Acton ACT Australia
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3
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Garcés-Restrepo MF, Pauli JN, Peery MZ. Natal dispersal of tree sloths in a human-dominated landscape: Implications for tropical biodiversity conservation. J Appl Ecol 2018. [DOI: 10.1111/1365-2664.13138] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Jonathan N. Pauli
- Department of Forest and Wildlife Ecology; University of Wisconsin-Madison; Madison WI USA
| | - M. Zachariah Peery
- Department of Forest and Wildlife Ecology; University of Wisconsin-Madison; Madison WI USA
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4
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Pulsford SA, Driscoll DA, Barton PS, Lindenmayer DB. Remnant vegetation, plantings and fences are beneficial for reptiles in agricultural landscapes. J Appl Ecol 2017. [DOI: 10.1111/1365-2664.12923] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stephanie A. Pulsford
- Fenner School of Environment and Society; Australian National University; Canberra ACT 2601 Australia
| | - Don A. Driscoll
- Centre for Integrative Ecology; School of Life and Environmental Sciences; Deakin University; Burwood Vic. Australia
| | - Philip S. Barton
- Fenner School of Environment and Society; Australian National University; Canberra ACT 2601 Australia
| | - David B. Lindenmayer
- Fenner School of Environment and Society; Australian National University; Canberra ACT 2601 Australia
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5
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Almeida-Gomes M, Rocha CFD, Vieira MV. Local and Landscape Factors Driving the Structure of Tropical Anuran Communities: Do Ephemeral Ponds have a Nested Pattern? Biotropica 2016. [DOI: 10.1111/btp.12285] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mauricio Almeida-Gomes
- Departamento de Ecologia; Laboratório de Vertebrados; Universidade Federal do Rio de Janeiro; Avenida Carlos Chagas Filho, 373 Cidade Universitária CEP 21941-902 Rio de Janeiro RJ Brazil
| | - Carlos F. D. Rocha
- Departamento de Ecologia; Universidade do Estado do Rio de Janeiro; Rua São Francisco Xavier, 524 CEP 20550-900 Rio de Janeiro RJ Brazil
| | - Marcus V. Vieira
- Departamento de Ecologia; Laboratório de Vertebrados; Universidade Federal do Rio de Janeiro; Avenida Carlos Chagas Filho, 373 Cidade Universitária CEP 21941-902 Rio de Janeiro RJ Brazil
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Driscoll DA, Banks SC, Barton PS, Lindenmayer DB, Smith AL. Conceptual domain of the matrix in fragmented landscapes. Trends Ecol Evol 2013; 28:605-13. [DOI: 10.1016/j.tree.2013.06.010] [Citation(s) in RCA: 229] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 06/02/2013] [Accepted: 06/20/2013] [Indexed: 10/26/2022]
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7
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Coulon A, Fitzpatrick JW, Bowman R, Lovette IJ. Mind the gap: genetic distance increases with habitat gap size in Florida scrub jays. Biol Lett 2012; 8:582-5. [PMID: 22357936 DOI: 10.1098/rsbl.2011.1244] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Habitat gap size has been negatively linked to movement probability in several species occupying fragmented landscapes. How these effects on movement behaviour in turn affect the genetic structure of fragmented populations at local scales is less well known. We tested, and confirmed, the hypothesis that genetic differentiation among adjacent populations of Florida scrub jays--an endangered bird species with poor dispersal abilities and a high degree of habitat specialization--increases with the width of habitat gaps separating them. This relationship was not an artefact of simple isolation-by-distance, as genetic distance was not correlated with the Euclidean distance between geographical centroids of the adjacent populations. Our results suggest that gap size affects movement behaviour even at remarkably local spatial scales, producing direct consequences on the genetic structure of fragmented populations. This finding shows that conserving genetic continuity for specialist species within fragmented habitat requires maintenance or restoration of preserve networks in which habitat gaps do not exceed a species-specific threshold distance.
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Affiliation(s)
- Aurélie Coulon
- Cornell Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, NY 14850, USA.
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Jürgens N, Schmiedel U, Haarmeyer DH, Dengler J, Finckh M, Goetze D, Gröngröft A, Hahn K, Koulibaly A, Luther-Mosebach J, Muche G, Oldeland J, Petersen A, Porembski S, Rutherford MC, Schmidt M, Sinsin B, Strohbach BJ, Thiombiano A, Wittig R, Zizka G. The BIOTA Biodiversity Observatories in Africa--a standardized framework for large-scale environmental monitoring. ENVIRONMENTAL MONITORING AND ASSESSMENT 2012; 184:655-678. [PMID: 21448628 DOI: 10.1007/s10661-011-1993-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Accepted: 02/23/2011] [Indexed: 05/30/2023]
Abstract
The international, interdisciplinary biodiversity research project BIOTA AFRICA initiated a standardized biodiversity monitoring network along climatic gradients across the African continent. Due to an identified lack of adequate monitoring designs, BIOTA AFRICA developed and implemented the standardized BIOTA Biodiversity Observatories, that meet the following criteria (a) enable long-term monitoring of biodiversity, potential driving factors, and relevant indicators with adequate spatial and temporal resolution, (b) facilitate comparability of data generated within different ecosystems, (c) allow integration of many disciplines, (d) allow spatial up-scaling, and (e) be applicable within a network approach. A BIOTA Observatory encompasses an area of 1 km(2) and is subdivided into 100 1-ha plots. For meeting the needs of sampling of different organism groups, the hectare plot is again subdivided into standardized subplots, whose sizes follow a geometric series. To allow for different sampling intensities but at the same time to characterize the whole square kilometer, the number of hectare plots to be sampled depends on the requirements of the respective discipline. A hierarchical ranking of the hectare plots ensures that all disciplines monitor as many hectare plots jointly as possible. The BIOTA Observatory design assures repeated, multidisciplinary standardized inventories of biodiversity and its environmental drivers, including options for spatial up- and downscaling and different sampling intensities. BIOTA Observatories have been installed along climatic and landscape gradients in Morocco, West Africa, and southern Africa. In regions with varying land use, several BIOTA Observatories are situated close to each other to analyze management effects.
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Affiliation(s)
- Norbert Jürgens
- Biodiversity, Evolution and Ecology of Plants, Biocentre Klein Flottbek and Botanical Garden, University of Hamburg, Ohnhorststr. 18, 22609 Hamburg, Germany
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Chiappero MB, Panzetta-Dutari GM, Gómez D, Castillo E, Polop JJ, Gardenal CN. Contrasting genetic structure of urban and rural populations of the wild rodent Calomys musculinus (Cricetidae, Sigmodontinae). Mamm Biol 2011. [DOI: 10.1016/j.mambio.2010.02.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Ruiz-Gutiérrez V, Zipkin EF, Dhondt AA. Occupancy dynamics in a tropical bird community: unexpectedly high forest use by birds classified as non-forest species. J Appl Ecol 2010. [DOI: 10.1111/j.1365-2664.2010.01811.x] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Wasiolka B, Jeltsch F, Henschel J, Blaum N. Space use of the spotted sand lizard (Pedioplanis l. lineoocellata) under different degradation states. Afr J Ecol 2010. [DOI: 10.1111/j.1365-2028.2009.01085.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Meyer J, Kohnen A, Durka W, Wöstemeyer J, Blaum N, Rossmanith E, Brandl R. Genetic structure and dispersal in a small South African rodent. Is dispersal female-biased? Mamm Biol 2009. [DOI: 10.1016/j.mambio.2008.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Wasiolka B, Blaum N, Jeltsch F, Henschel J. Behavioural responses of the lizard Pedioplanis l. lineoocellata to overgrazing. ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 2009. [DOI: 10.1016/j.actao.2008.09.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Wichmann MC, Alexander MJ, Soons MB, Galsworthy S, Dunne L, Gould R, Fairfax C, Niggemann M, Hails RS, Bullock JM. Human-mediated dispersal of seeds over long distances. Proc Biol Sci 2009; 276:523-32. [PMID: 18826932 DOI: 10.1098/rspb.2008.1131] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Human activities have fundamental impacts on the distribution of species through altered land use, but also directly by dispersal of propagules. Rare long-distance dispersal events have a disproportionate importance for the spread of species including invasions. While it is widely accepted that humans may act as vectors of long-distance dispersal, there are few studies that quantify this process. We studied in detail a mechanism of human-mediated dispersal (HMD). For two plant species we measured, over a wide range of distances, how many seeds are carried by humans on shoes. While over half of the seeds fell off within 5m, seeds were regularly still attached to shoes after 5 km. Semi-mechanistic models were fitted, and these suggested that long-distance dispersal on shoes is facilitated by decreasing seed detachment probability with distance. Mechanistic modelling showed that the primary vector, wind, was less important as an agent of long-distance dispersal, dispersing seeds less than 250 m. Full dispersal kernels were derived by combining the models for primary dispersal by wind and secondary dispersal by humans. These suggest that walking humans can disperse seeds to very long distances, up to at least 10 km, and provide some of the first quantified dispersal kernels for HMD.
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Affiliation(s)
- Matthias C Wichmann
- Centre for Ecology and Hydrology, CEH Wallingford, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB, UK.
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15
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Gauffre B, Estoup A, Bretagnolle V, Cosson JF. Spatial genetic structure of a small rodent in a heterogeneous landscape. Mol Ecol 2009; 17:4619-29. [PMID: 19140985 DOI: 10.1111/j.1365-294x.2008.03950.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Gene flow in natural populations may be strongly influenced by landscape features. The integration of landscape characteristics in population genetic studies may thus improve our understanding of population functioning. In this study, we investigated the population genetic structure and gene flow pattern for the common vole, Microtus arvalis, in a heterogeneous landscape characterised by strong spatial and temporal variation. The studied area is an intensive agricultural zone of approximately 500 km(2) crossed by a motorway. We used individual-based Bayesian methods to define the number of population units and their spatial borders without prior delimitation of such units. Unexpectedly, we determined a single genetic unit that covered the entire area studied. In particular, the motorway considered as a likely barrier to dispersal was not associated with any spatial genetic discontinuity. Using computer simulations, we demonstrated that recent anthropogenic barriers to effective dispersal are difficult to detect through analysis of genetic variation for species with large effective population sizes. We observed a slight, but significant, pattern of isolation by distance over the whole study site. Spatial autocorrelation analyses detected genetic structuring on a local scale, most probably due to the social organisation of the study species. Overall, our analysis suggests intense small-scale dispersal associated with a large effective population size. High dispersal rates may be imposed by the strong spatio-temporal heterogeneity of habitat quality, which characterises intensive agroecosystems.
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Affiliation(s)
- B Gauffre
- INRA, UMR CBGP (INRA/IRD/Cirad/Montpellier SupAgro), Campus international de Baillarguet, CS 30016, F-34988 Montferrier-sur-Lez cedex, France.
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16
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Topping CJ, Dalkvist T, Forbes VE, Grimm V, Sibly RM. The Potential for the Use of Agent-Based Models in Ecotoxicology. ECOTOXICOLOGY MODELING 2009. [DOI: 10.1007/978-1-4419-0197-2_8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Blaum N. Seasonal differences in spatial distribution of small carnivores in fragmented savannah landscapes. Afr J Ecol 2008. [DOI: 10.1111/j.1365-2028.2008.00977.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Schwager M, Covas R, Blaum N, Jeltsch F. Limitations of population models in predicting climate change effects: a simulation study of sociable weavers in southern Africa. OIKOS 2008. [DOI: 10.1111/j.0030-1299.2008.16464.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Blaum N, Engeman RM, Wasiolka B, Rossmanith E. Indexing small mammalian carnivores in the southern Kalahari, South Africa. WILDLIFE RESEARCH 2008. [DOI: 10.1071/wr07023] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Monitoring animal populations in changing environments is crucial to wildlife conservation and management, but restrictions in resources are a recurring problem for wildlife managers and researchers throughout Africa. Land-use-induced shrub encroachment in Kalahari savannah rangelands has led to fragmentation of the landscape. Mammalian carnivores are particularly vulnerable to local extinction in fragmented landscapes, but their low numbers and their often nocturnal and secretive habits make them difficult to monitor. In this study, we tested the applicability of a passive tracking method and compared two measurement methods and index calculations for monitoring small carnivores across a grazing gradient in the southern Kalahari. During the four years of monitoring in a five-year period, we used the knowledge of indigenous Khoisan Bushmen for the identification of carnivore tracks on 640 sand transects (5 m × 250 m). Our results showed that this simple and inexpensive observation method enabled detailed monitoring of 10 small carnivore species across the grazing gradient. A binary index calculated an index based on presence/absence of a species’ tracks on each transect, whereas the track intrusion index used the number of track intrusions to each transect for each species in its calculations. For less common species, the two indices were similar in trend and magnitude, because the number of intrusions to each transect was typically 1 or 0. Usually, the two indices showed relatively strong correlations. However, species with patchy distributions of higher numbers presented difficulties for the binary index to monitor trends, but not for the track intrusion index.
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Wilson GA, Rannala B. Bayesian inference of recent migration rates using multilocus genotypes. Genetics 2003; 163:1177-1191. [PMID: 12663554 DOI: 10.1111/fwb.12079] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
A new Bayesian method that uses individual multilocus genotypes to estimate rates of recent immigration (over the last several generations) among populations is presented. The method also estimates the posterior probability distributions of individual immigrant ancestries, population allele frequencies, population inbreeding coefficients, and other parameters of potential interest. The method is implemented in a computer program that relies on Markov chain Monte Carlo techniques to carry out the estimation of posterior probabilities. The program can be used with allozyme, microsatellite, RFLP, SNP, and other kinds of genotype data. We relax several assumptions of early methods for detecting recent immigrants, using genotype data; most significantly, we allow genotype frequencies to deviate from Hardy-Weinberg equilibrium proportions within populations. The program is demonstrated by applying it to two recently published microsatellite data sets for populations of the plant species Centaurea corymbosa and the gray wolf species Canis lupus. A computer simulation study suggests that the program can provide highly accurate estimates of migration rates and individual migrant ancestries, given sufficient genetic differentiation among populations and sufficient numbers of marker loci.
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Affiliation(s)
- Gregory A Wilson
- Department of Medical Genetics, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
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