@article{KellerLenzSchmidtetal.2019, author = {Keller, Matthias and Lenz, Daniel and Schmidt, Marcel and Schwarz, Michael}, title = {Boundary representation of Dirichlet forms on discrete spaces}, series = {Journal de Math{\´e}matiques Pures et Appliqu{\´e}es}, volume = {126}, journal = {Journal de Math{\´e}matiques Pures et Appliqu{\´e}es}, publisher = {Elsevier}, address = {Amsterdam}, issn = {0021-7824}, doi = {10.1016/j.matpur.2018.10.005}, pages = {109 -- 143}, year = {2019}, abstract = {We describe the set of all Dirichlet forms associated to a given infinite graph in terms of Dirichlet forms on its Royden boundary. Our approach is purely analytical and uses form methods. (C) 2018 Elsevier Masson SAS.}, language = {en} } @article{KellerLenzMuenchetal.2016, author = {Keller, Matthias and Lenz, Daniel and M{\"u}nch, Florentin and Schmidt, Marcel and Telcs, Andras}, title = {Note on short-time behavior of semigroups associated to self-adjoint operators}, series = {Bulletin of the London Mathematical Society}, volume = {48}, journal = {Bulletin of the London Mathematical Society}, publisher = {Oxford Univ. Press}, address = {Oxford}, issn = {0024-6093}, doi = {10.1112/blms/bdw054}, pages = {935 -- 944}, year = {2016}, abstract = {We present a simple observation showing that the heat kernel on a locally finite graph behaves for short times t roughly like t(d), where d is the combinatorial distance. This is very different from the classical Varadhan-type behavior on manifolds. Moreover, this also gives that short-time behavior and global behavior of the heat kernel are governed by two different metrics whenever the degree of the graph is not uniformly bounded.}, language = {en} } @misc{RibeiroMartinsFickelLeetal.2017, author = {Ribeiro Martins, Renata Filipa and Fickel, J{\"o}rns and Le, Minh and Nguyen, Thanh van and Nguyen, Ha M. and Timmins, Robert and Gan, Han Ming and Rovie-Ryan, Jeffrine J. and Lenz, Dorina and F{\"o}rster, Daniel W. and Wilting, Andreas}, title = {Phylogeography of red muntjacs reveals three distinct mitochondrial lineages}, series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, journal = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe}, number = {973}, issn = {1866-8372}, doi = {10.25932/publishup-43078}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-430780}, pages = {14}, year = {2017}, abstract = {Background The members of the genus Muntiacus are of particular interest to evolutionary biologists due to their extreme chromosomal rearrangements and the ongoing discussions about the number of living species. Red muntjacs have the largest distribution of all muntjacs and were formerly considered as one species. Karyotype differences led to the provisional split between the Southern Red Muntjac (Muntiacus muntjak) and the Northern Red Muntjac (M. vaginalis), but uncertainties remain as, so far, no phylogenetic study has been conducted. Here, we analysed whole mitochondrial genomes of 59 archival and 16 contemporaneous samples to resolve uncertainties about their taxonomy and used red muntjacs as model for understanding the evolutionary history of other species in Southeast Asia. Results We found three distinct matrilineal groups of red muntjacs: Sri Lankan red muntjacs (including the Western Ghats) diverged first from other muntjacs about 1.5 Mya; later northern red muntjacs (including North India and Indochina) and southern red muntjacs (Sundaland) split around 1.12 Mya. The diversification of red muntjacs into these three main lineages was likely promoted by two Pleistocene barriers: one through the Indian subcontinent and one separating the Indochinese and Sundaic red muntjacs. Interestingly, we found a high level of gene flow within the populations of northern and southern red muntjacs, indicating gene flow between populations in Indochina and dispersal of red muntjacs over the exposed Sunda Shelf during the Last Glacial Maximum. Conclusions Our results provide new insights into the evolution of species in South and Southeast Asia as we found clear genetic differentiation in a widespread and generalist species, corresponding to two known biogeographical barriers: The Isthmus of Kra and the central Indian dry zone. In addition, our molecular data support either the delineation of three monotypic species or three subspecies, but more importantly these data highlight the conservation importance of the Sri Lankan/South Indian red muntjac.}, language = {en} } @article{MartinsFickelMinhLeetal.2017, author = {Martins, Renata F. and Fickel, J{\"o}rns and Minh Le, and Thanh Van Nguyen, and Nguyen, Ha M. and Timmins, Robert and Gan, Han Ming and Rovie-Ryan, Jeffrine J. and Lenz, Dorina and F{\"o}rster, Daniel W. and Wilting, Andreas}, title = {Phylogeography of red muntjacs reveals three distinct mitochondrial lineages}, series = {BMC evolutionary biology}, volume = {17}, journal = {BMC evolutionary biology}, number = {34}, publisher = {BioMed Central}, address = {London}, issn = {1471-2148}, doi = {10.1186/s12862-017-0888-0}, pages = {12}, year = {2017}, abstract = {Background: The members of the genus Muntiacus are of particular interest to evolutionary biologists due to their extreme chromosomal rearrangements and the ongoing discussions about the number of living species. Red muntjacs have the largest distribution of all muntjacs and were formerly considered as one species. Karyotype differences led to the provisional split between the Southern Red Muntjac (Muntiacus muntjak) and the Northern Red Muntjac (M. vaginalis), but uncertainties remain as, so far, no phylogenetic study has been conducted. Here, we analysed whole mitochondrial genomes of 59 archival and 16 contemporaneous samples to resolve uncertainties about their taxonomy and used red muntjacs as model for understanding the evolutionary history of other species in Southeast Asia. Results: We found three distinct matrilineal groups of red muntjacs: Sri Lankan red muntjacs (including the Western Ghats) diverged first from other muntjacs about 1.5 Mya; later northern red muntjacs (including North India and Indochina) and southern red muntjacs (Sundaland) split around 1.12 Mya. The diversification of red muntjacs into these three main lineages was likely promoted by two Pleistocene barriers: one through the Indian subcontinent and one separating the Indochinese and Sundaic red muntjacs. Interestingly, we found a high level of gene flow within the populations of northern and southern red muntjacs, indicating gene flow between populations in Indochina and dispersal of red muntjacs over the exposed Sunda Shelf during the Last Glacial Maximum. Conclusions: Our results provide new insights into the evolution of species in South and Southeast Asia as we found clear genetic differentiation in a widespread and generalist species, corresponding to two known biogeographical barriers: The Isthmus of Kra and the central Indian dry zone. In addition, our molecular data support either the delineation of three monotypic species or three subspecies, but more importantly these data highlight the conservation importance of the Sri Lankan/South Indian red muntjac.}, language = {en} } @article{FoersterBullLenzetal.2018, author = {F{\"o}rster, Daniel W. and Bull, James K. and Lenz, Dorina and Autenrieth, Marijke and Paijmans, Johanna L. A. and Kraus, Robert H. S. and Nowak, Carsten and Bayerl, Helmut and K{\"u}hn, Ralph and Saveljev, Alexander P. and Sindicic, Magda and Hofreiter, Michael and Schmidt, Krzysztof and Fickel, J{\"o}rns}, title = {Targeted resequencing of coding DNA sequences for SNP discovery in nonmodel species}, series = {Molecular ecology resources}, volume = {18}, journal = {Molecular ecology resources}, number = {6}, publisher = {Wiley}, address = {Hoboken}, issn = {1755-098X}, doi = {10.1111/1755-0998.12924}, pages = {1356 -- 1373}, year = {2018}, abstract = {Targeted capture coupled with high-throughput sequencing can be used to gain information about nuclear sequence variation at hundreds to thousands of loci. Divergent reference capture makes use of molecular data of one species to enrich target loci in other (related) species. This is particularly valuable for nonmodel organisms, for which often no a priori knowledge exists regarding these loci. Here, we have used targeted capture to obtain data for 809 nuclear coding DNA sequences (CDS) in a nonmodel organism, the Eurasian lynx Lynx lynx, using baits designed with the help of the published genome of a related model organism (the domestic cat Felis catus). Using this approach, we were able to survey intraspecific variation at hundreds of nuclear loci in L. lynx across the species' European range. A large set of biallelic candidate SNPs was then evaluated using a high-throughput SNP genotyping platform (Fluidigm), which we then reduced to a final 96 SNP-panel based on assay performance and reliability; validation was carried out with 100 additional Eurasian lynx samples not included in the SNP discovery phase. The 96 SNP-panel developed from CDS performed very successfully in the identification of individuals and in population genetic structure inference (including the assignment of individuals to their source population). In keeping with recent studies, our results show that genic SNPs can be valuable for genetic monitoring of wildlife species.}, language = {en} } @article{PatelWutkeLenzetal.2017, author = {Patel, Riddhi P. and Wutke, Saskia and Lenz, Dorina and Mukherjee, Shomita and Ramakrishnan, Uma and Veron, Geraldine and Fickel, J{\"o}rns and Wilting, Andreas and F{\"o}rster, Daniel W.}, title = {Genetic Structure and Phylogeography of the Leopard Cat (Prionailurus bengalensis) Inferred from Mitochondrial Genomes}, series = {Journal of Heredity}, volume = {108}, journal = {Journal of Heredity}, number = {4}, publisher = {Oxford Univ. Press}, address = {Cary}, issn = {0022-1503}, doi = {10.1093/jhered/esx017}, pages = {349 -- 360}, year = {2017}, abstract = {The Leopard cat Prionailurus bengalensis is a habitat generalist that is widely distributed across Southeast Asia. Based on morphological traits, this species has been subdivided into 12 subspecies. Thus far, there have been few molecular studies investigating intraspecific variation, and those had been limited in geographic scope. For this reason, we aimed to study the genetic structure and evolutionary history of this species across its very large distribution range in Asia. We employed both PCR-based (short mtDNA fragments, 94 samples) and high throughput sequencing based methods (whole mitochondrial genomes, 52 samples) on archival, noninvasively collected and fresh samples to investigate the distribution of intraspecific genetic variation. Our comprehensive sampling coupled with the improved resolution of a mitochondrial genome analyses provided strong support for a deep split between Mainland and Sundaic Leopard cats. Although we identified multiple haplogroups within the species' distribution, we found no matrilineal evidence for the distinction of 12 subspecies. In the context of Leopard cat biogeography, we cautiously recommend a revision of the Prionailurus bengalensis subspecific taxonomy: namely, a reduction to 4 subspecies (2 mainland and 2 Sundaic forms).}, language = {en} } @article{PatelFoersterKitcheneretal.2016, author = {Patel, Riddhi P. and F{\"o}rster, Daniel W. and Kitchener, Andrew C. and Rayan, Mark D. and Mohamed, Shariff W. and Werner, Laura and Lenz, Dorina and Pfestorf, Hans and Kramer-Schadt, Stephanie and Radchuk, Viktoriia and Fickel, J{\"o}rns and Wilting, Andreas}, title = {Two species of Southeast Asian cats in the genus Catopuma with diverging histories: an island endemic forest specialist and a widespread habitat generalist}, series = {Royal Society Open Science}, volume = {3}, journal = {Royal Society Open Science}, publisher = {Royal Society}, address = {London}, issn = {2054-5703}, doi = {10.1098/rsos.160350}, pages = {741 -- 752}, year = {2016}, abstract = {Background. The bay cat Catopuma badia is endemic to Borneo, whereas its sister species the Asian golden cat Catopuma temminckii is distributed from the Himalayas and southern China through Indochina, Peninsular Malaysia and Sumatra. Based onmorphological data, up to five subspecies of the Asian golden cat have been recognized, but a taxonomic assessment, including molecular data and morphological characters, is still lacking. Results. We combined molecular data (whole mitochondrial genomes), morphological data (pelage) and species distribution projections (up to the Late Pleistocene) to infer how environmental changes may have influenced the distribution of these sister species over the past 120 000 years. The molecular analysis was based on sequenced mitogenomes of 3 bay cats and 40 Asian golden cats derived mainly from archival samples. Our molecular data suggested a time of split between the two species approximately 3.16 Ma and revealed very low nucleotide diversity within the Asian golden cat population, which supports recent expansion of the population. Discussion. The low nucleotide diversity suggested a population bottleneck in the Asian golden cat, possibly caused by the eruption of the Toba volcano in Northern Sumatra (approx. 74 kya), followed by a continuous population expansion in the Late Pleistocene/Early Holocene. Species distribution projections, the reconstruction of the demographic history, a genetic isolation-by-distance pattern and a gradual variation of pelage pattern support the hypothesis of a post-Toba population expansion of the Asian golden cat from south China/Indochina to PeninsularMalaysia and Sumatra. Our findings reject the current classification of five subspecies for the Asian golden cat, but instead support either a monotypic species or one comprising two subspecies: (i) the Sunda golden cat, distributed south of the Isthmus of Kra: C. t. temminckii and (ii) Indochinese, Indian, Himalayan and Chinese golden cats, occurring north of the Isthmus: C. t. moormensis.}, language = {en} } @article{TanskiBergstedtBevingtonetal.2019, author = {Tanski, George and Bergstedt, Helena and Bevington, Alexandre and Bonnaventure, Philip and Bouchard, Frederic and Coch, Caroline and Dumais, Simon and Evgrafova, Alevtina and Frauenfeld, Oliver W. and Frederick, Jennifer and Fritz, Michael and Frolov, Denis and Harder, Silvie and Hartmeyer, Ingo and Heslop, Joanne and Hoegstroem, Elin and Johansson, Margareta and Kraev, Gleb and Kuznetsova, Elena and Lenz, Josefine and Lupachev, Alexey and Magnin, Florence and Martens, Jannik and Maslakov, Alexey and Morgenstern, Anne and Nieuwendam, Alexandre and Oliva, Marc and Radosavljevi, Boris and Ramage, Justine Lucille and Schneider, Andrea and Stanilovskaya, Julia and Strauss, Jens and Trochim, Erin and Vecellio, Daniel J. and Weber, Samuel and Lantuit, Hugues}, title = {The Permafrost Young Researchers Network (PYRN) is getting older}, series = {Polar record}, volume = {55}, journal = {Polar record}, number = {4}, publisher = {Cambridge Univ. Press}, address = {New York}, issn = {0032-2474}, doi = {10.1017/S0032247418000645}, pages = {216 -- 219}, year = {2019}, abstract = {A lasting legacy of the International Polar Year (IPY) 2007-2008 was the promotion of the Permafrost Young Researchers Network (PYRN), initially an IPY outreach and education activity by the International Permafrost Association (IPA). With the momentum of IPY, PYRN developed into a thriving network that still connects young permafrost scientists, engineers, and researchers from other disciplines. This research note summarises (1) PYRN's development since 2005 and the IPY's role, (2) the first 2015 PYRN census and survey results, and (3) PYRN's future plans to improve international and interdisciplinary exchange between young researchers. The review concludes that PYRN is an established network within the polar research community that has continually developed since 2005. PYRN's successful activities were largely fostered by IPY. With >200 of the 1200 registered members active and engaged, PYRN is capitalising on the availability of social media tools and rising to meet environmental challenges while maintaining its role as a successful network honouring the legacy of IPY.}, language = {en} } @article{PatelLenzKitcheneretal.2017, author = {Patel, Riddhi P. and Lenz, Dorina and Kitchener, Andrew C. and Fickel, Jorns and Foerster, Daniel W. and Wilting, Andreas}, title = {Threatened but understudied: supporting conservation by understanding the genetic structure of the flat-headed cat}, series = {Conservation genetics}, volume = {18}, journal = {Conservation genetics}, publisher = {Springer}, address = {Dordrecht}, issn = {1566-0621}, doi = {10.1007/s10592-017-0990-2}, pages = {1423 -- 1433}, year = {2017}, language = {en} }