bioRxiv (Cold Spring Harbor Laboratory), Aug 22, 2022
1. One of the central challenges in ecology and animal behaviour is to generate animal home range... more 1. One of the central challenges in ecology and animal behaviour is to generate animal home range estimations. Kernel density estimate for home range has been one of the most widely used estimates these last few decades, despite its limitations. More recently a network-based kernel density (NKDE) approach has been proposed, which uses Delaunay triangulation. 2. Here we show that NKDE has a discontinuous kernel density. We then develop a new network-based method that emphasises entirely on the edges, instead of the nodes in the network. We call this Edge-Focused Network-based Kernel Density Estimation (EFNKDE). In this method, a unit weight is distributed uniformly along each edge of the network and Euclidean distance is used to compute the contribution of each segment of the edge to the kernel density at a given point. 3. This is a network based method that leads to a continuous and differentiable kernel density. An analytical expression for the same is obtained for the Gaussian kernel. By taking concrete examples and studying different methods and through different perspectives across a range of bandwidths, we show that EFNKDE has many advantages over other methods. We present a model that provides a theoretical basis to the effectiveness of EFNKDE in linear regimes. 4. EFNKDE is easy to apply, can work with minimal data, provides a smooth kernel density that highlights the network and does not overemphasise the data. This method is most suitable for estimating home ranges with narrow corridors and forbidden regions.
The value of urban and peri-urban conservation efforts within a global biodiversity hotspot', Bot... more The value of urban and peri-urban conservation efforts within a global biodiversity hotspot', Bothalia 46(2), a2106.
1. One of the central challenges in ecology and animal behaviour is to generate animal home range... more 1. One of the central challenges in ecology and animal behaviour is to generate animal home range estimations. Kernel density estimate for home range has been one of the most widely used estimates these last few decades, despite its limitations. More recently a network-based kernel density (NKDE) approach has been proposed, which uses Delaunay triangulation. 2. Here we show that NKDE has a discontinuous kernel density. We then develop a new network-based method that emphasises entirely on the edges, instead of the nodes in the network. We call this Edge-Focused Network-based Kernel Density Estimation (EFNKDE). In this method, a unit weight is distributed uniformly along each edge of the network and Euclidean distance is used to compute the contribution of each segment of the edge to the kernel density at a given point. 3. This is a network based method that leads to a continuous and differentiable kernel density. An analytical expression for the same is obtained for the Gaussian ker...
Proceedings of the National Academy of Sciences of the United States of America, Jul 8, 2014
We are particularly grateful to J. Kattge for helping us access the data, and to J. Dickie, M. Kl... more We are particularly grateful to J. Kattge for helping us access the data, and to J. Dickie, M. Kleyer (and other LEDA authors), P. Reich, and J. Peñuelas for contributing especially large quantities of trait data." In addition, the authors note that the Materials and Methods section should have clearly indicated that the original references for the TRY data are included in the Supporting Information. Finally, the authors note that a reference to an article by Niinemets included in the Supporting Information should have been located in the Materials and Methods section. The citation should appear on page 744, left column, second full paragraph, line 9. The complete reference appears below.
Demographic data for the 222 species included in the analysis. Accompanying species trait means c... more Demographic data for the 222 species included in the analysis. Accompanying species trait means can be requested from the TRY database (http://www.try-db.org)
To better match plant materials to ecological sites for the purpose of rangeland seedling establi... more To better match plant materials to ecological sites for the purpose of rangeland seedling establishment, we examined the relationship between seed size and growth and morphological traits in young seedlings of bluebunch wheatgrass (BBWG) (Pseudoroegneria spicata [Pursh.] Á. Löve), a perennial Triticeae bunchgrass native to the Intermountain West. Traits examined included onset of germination, seedling biomass traits, and seedling surfacearea traits. We grew seeds of nine BBWG populations that varied for seed size and were produced in a common environment under 2 contrasting d/n temperature regimes (20/15°C; 10/5°C). Lighter-seeded populations germinated and initiated shoots earlier. Heavier-seeded populations displayed high levels of biomass-related traits (e.g., shoot and root biomass and shoot length), while lighter-seeded populations displayed high levels of surface area−related traits (e.g., specific leaf area and specific root length [SRL]). Correlations between seed size and young-seedling traits were mostly similar under the two temperature regimes. However, root length−related traits showed more positive correlations with seed size under the low-temperature regime, which is more similar to actual field-emergence conditions during early spring. P-24, a light-seeded population, originated from the most arid site and exhibited the highest SRL at low temperature, while T-17t, a heavy-seeded population, originated from the most mesic site and exhibited moderate SRL. Three populations used for rangeland revegetation, "Whitmar," "Goldar," and Anatone Germplasm, all exhibited low seed mass and high SRL. However, only Anatone displayed high root-to-shoot length ratio under both temperature regimes, perhaps explaining its wide and successful use in rangeland seedings. Published by Elsevier Inc. on behalf of The Society for Range Management.
bioRxiv (Cold Spring Harbor Laboratory), Aug 22, 2022
1. One of the central challenges in ecology and animal behaviour is to generate animal home range... more 1. One of the central challenges in ecology and animal behaviour is to generate animal home range estimations. Kernel density estimate for home range has been one of the most widely used estimates these last few decades, despite its limitations. More recently a network-based kernel density (NKDE) approach has been proposed, which uses Delaunay triangulation. 2. Here we show that NKDE has a discontinuous kernel density. We then develop a new network-based method that emphasises entirely on the edges, instead of the nodes in the network. We call this Edge-Focused Network-based Kernel Density Estimation (EFNKDE). In this method, a unit weight is distributed uniformly along each edge of the network and Euclidean distance is used to compute the contribution of each segment of the edge to the kernel density at a given point. 3. This is a network based method that leads to a continuous and differentiable kernel density. An analytical expression for the same is obtained for the Gaussian kernel. By taking concrete examples and studying different methods and through different perspectives across a range of bandwidths, we show that EFNKDE has many advantages over other methods. We present a model that provides a theoretical basis to the effectiveness of EFNKDE in linear regimes. 4. EFNKDE is easy to apply, can work with minimal data, provides a smooth kernel density that highlights the network and does not overemphasise the data. This method is most suitable for estimating home ranges with narrow corridors and forbidden regions.
The value of urban and peri-urban conservation efforts within a global biodiversity hotspot', Bot... more The value of urban and peri-urban conservation efforts within a global biodiversity hotspot', Bothalia 46(2), a2106.
1. One of the central challenges in ecology and animal behaviour is to generate animal home range... more 1. One of the central challenges in ecology and animal behaviour is to generate animal home range estimations. Kernel density estimate for home range has been one of the most widely used estimates these last few decades, despite its limitations. More recently a network-based kernel density (NKDE) approach has been proposed, which uses Delaunay triangulation. 2. Here we show that NKDE has a discontinuous kernel density. We then develop a new network-based method that emphasises entirely on the edges, instead of the nodes in the network. We call this Edge-Focused Network-based Kernel Density Estimation (EFNKDE). In this method, a unit weight is distributed uniformly along each edge of the network and Euclidean distance is used to compute the contribution of each segment of the edge to the kernel density at a given point. 3. This is a network based method that leads to a continuous and differentiable kernel density. An analytical expression for the same is obtained for the Gaussian ker...
Proceedings of the National Academy of Sciences of the United States of America, Jul 8, 2014
We are particularly grateful to J. Kattge for helping us access the data, and to J. Dickie, M. Kl... more We are particularly grateful to J. Kattge for helping us access the data, and to J. Dickie, M. Kleyer (and other LEDA authors), P. Reich, and J. Peñuelas for contributing especially large quantities of trait data." In addition, the authors note that the Materials and Methods section should have clearly indicated that the original references for the TRY data are included in the Supporting Information. Finally, the authors note that a reference to an article by Niinemets included in the Supporting Information should have been located in the Materials and Methods section. The citation should appear on page 744, left column, second full paragraph, line 9. The complete reference appears below.
Demographic data for the 222 species included in the analysis. Accompanying species trait means c... more Demographic data for the 222 species included in the analysis. Accompanying species trait means can be requested from the TRY database (http://www.try-db.org)
To better match plant materials to ecological sites for the purpose of rangeland seedling establi... more To better match plant materials to ecological sites for the purpose of rangeland seedling establishment, we examined the relationship between seed size and growth and morphological traits in young seedlings of bluebunch wheatgrass (BBWG) (Pseudoroegneria spicata [Pursh.] Á. Löve), a perennial Triticeae bunchgrass native to the Intermountain West. Traits examined included onset of germination, seedling biomass traits, and seedling surfacearea traits. We grew seeds of nine BBWG populations that varied for seed size and were produced in a common environment under 2 contrasting d/n temperature regimes (20/15°C; 10/5°C). Lighter-seeded populations germinated and initiated shoots earlier. Heavier-seeded populations displayed high levels of biomass-related traits (e.g., shoot and root biomass and shoot length), while lighter-seeded populations displayed high levels of surface area−related traits (e.g., specific leaf area and specific root length [SRL]). Correlations between seed size and young-seedling traits were mostly similar under the two temperature regimes. However, root length−related traits showed more positive correlations with seed size under the low-temperature regime, which is more similar to actual field-emergence conditions during early spring. P-24, a light-seeded population, originated from the most arid site and exhibited the highest SRL at low temperature, while T-17t, a heavy-seeded population, originated from the most mesic site and exhibited moderate SRL. Three populations used for rangeland revegetation, "Whitmar," "Goldar," and Anatone Germplasm, all exhibited low seed mass and high SRL. However, only Anatone displayed high root-to-shoot length ratio under both temperature regimes, perhaps explaining its wide and successful use in rangeland seedings. Published by Elsevier Inc. on behalf of The Society for Range Management.
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Papers by Jayanti Ray-Mukherjee