#seminar alert! ⏰
Next Tuesday, Frank Hilker from the University of Osnabrück will give a talk in our Ecology Colloquium entitled
"To connect or not connect isolated patches: Total population abundance and failed rescue effects in fragmented landscapes".
Everyone welcome, either in person or via Zoom, the more the merrier! 😀
#Theoretical Ecology #YoMos
#EcologicalModelling #ecoevo #metapopulation
How moving – or not – as conditions change keeps species alive
Summary & Analysis by Jeremy Summers of "Partitioning the impacts of spatial-temporal variation in demography and dispersal on metapopulation growth rates" by Schreiber
https://www.amnat.org/an/newpapers/Feb-2025-Schreiber.html
Olusanya et al. study genetic load and extinction in a metapopulation. Their analysis is based on a novel theoretical framework that tracks the co-evolution of load and population sizes and gives a nuanced picture of the genetic and demographic factors that affect extinction. Now available ahead of print! https://www.journals.uchicago.edu/doi/10.1086/735562
#genetic #geneticLoad #extinction #metapopulation #coevolution #population
Good reviews on "Gene flow and habitat heterogeneity shape coexistence dynamics of Arctic charr morphs in connected lakes" at Molecular Ecology
Rejected but encouraged resubmission (which I hate, its plain metric-playing)
The main result being #GeneticStructure of four sympatric morphs in #thingvallavatn #Iceland
#AcademicChatter #rejectResubmit #evolution #genetics #popgen #divergence #ArcticCharr #sympatry #ecology #metapopulation #SourceSink
Gene flow and habitat heterogeneity shape coexistence dynamics of Arctic charr morphs in connected lakes. Han Xiao, et al
Submitted to Molecular Ecology,
preprint on Authorea.
#ecology #Evolution #popgen #charr #salmonid #diversity #geneticdiversity #metapopulation #speciation #geometricMorphometrics
Why does one metapopulation decline while another grows? Differences in habitat quality? Movement patterns? Schreiber quantifies the relative contributions of spatial & temporal variation in demography & dispersal to metapopulation growth rates.
https://www.journals.uchicago.edu/doi/10.1086/733434
In a new Special Feature, Kortessis et al. show the conceptual link between traditional metapopulation models and patch dynamic models of population growth in spatiotemporally varying environments. Read now ahead of print!
https://www.journals.uchicago.edu/doi/10.1086/733896
Gene flow and habitat heterogeneity shape coexistence dynamics of Arctic charr morphs in connected lakes
Han Xiao, Palsson, Jónsson, Snorrason
December 27, 2024.
DOI: 10.22541/au.173531304.47377188/v1
#evolution #popgen #metapopulation #fish #gbs #charr #Salmonid
New article just came out :
"Modelling the Dynamics of Outbreak Species: The Case of Ditrupa arietina (O.F. Müller), Gulf of Lions, NW Mediterranean Sea"
https://www.mdpi.com/2077-1312/12/2/350
Thanks to an impressive 10 yr observation series collected by one of our co-authors (F. Charles) @CNRS, the article shows what great data and a little mathematical modelling can do for prediction in marine ecology.
#metapopulation #marinebiology #outbreak #historicalecology #modelling
#predictive #ecology
An outbreak species exhibits extreme, rapid population fluctuations that can be qualified as discrete events within a continuous dynamic. When outbreaks occur they may appear novel and disconcerting because the limiting factors of their dynamics are not readily identifiable. We present the first population hybrid dynamic model that combines continuous and discrete processes, designed to simulate marine species outbreaks. The deterministic framework was tested using the case of an unexploited benthic invertebrate species: the small, serpulid polychaete Ditrupa arietina. This species is distributed throughout the northeast Atlantic Ocean and Mediterranean Sea; it has a life cycle characterised by a pelagic dispersive larval stage, while juveniles and adults are sedentary. Sporadic reports of extremely high, variable densities (from <10 to >10,000 ind.m−2) have attracted attention from marine ecologists for a century. However, except for one decade-long field study from the Bay of Banyuls (France, Gulf of Lions, Mediterranean Sea), observations are sparse. Minimal formulations quantified the processes governing the population dynamics. Local population continuous dynamics were simulated from a size-structured model with a null immigration–emigration flux balance. The mathematical properties, based on the derived hybrid model, demonstrated the possibilities of reaching an equilibrium for the population using a single number of recruits per reproducer. Two extrapolations were made: (1) local population dynamics were simulated over 180 years using North Atlantic Oscillation indices to force recruitment variability and (2) steady-state population densities over the Gulf of Lions were calculated from a connectivity matrix in a metapopulation. The dynamics reach a macroscopic stability in both extrapolations, despite the absence of density regulating mechanisms. This ensures the persistence of D. arietina, even when strong, irregular oscillations characteristic of an outbreak species are observed. The hybrid model suggests that a macroscopic equilibrium for a population with variable recruitment conditions can only be characterised for time periods which contain several outbreak occurrences distributed over a regional scale.
Dr. Korinna Allhoff
American Naturalist
charrvein
Charrvein
Dr. Jennifer
Corey Bradshaw (Kaurna Land)