On territorial behavior and other factors influencing habitat distribution in birds
TLDR
In this article, the Dickcissel sex ratio is employed as an indirect index of suitability and a sex ratio index was found to be correlated positively with density, consistent with the hypothesis that territorial behavior in males of this species limits their density.Abstract:
This example is provided so that non-theorists may see actual applications of the theory previously described. The Dickcissel sex ratio is employed as an indirect index of suitability. A sex ratio index was found to be correlated positively with density. This is consistent with the hypothesis that territorial behavior in the males of this species limits their density. This study provides a valid example of how the problem can be approached and offers a first step in the eventual identification of the role of territorial behavior in the habitat distribution of a common species.read more
Citations
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Protected polymorphisms and evolutionary stability of patch-selection strategies in stochastic environments.
TL;DR: It is shown that adding environmental stochasticity results in an ESS that, when compared to the ESS for the corresponding model without stochasticsity, spends less time in patches with larger carrying capacities and possibly makes use of sink patches, thereby practicing a spatial form of bet hedging.
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Prevalence and Mechanisms of Partial Migration in Ungulates
Jodi E. Berg,Jodi E. Berg,Jodi E. Berg,Mark Hebblewhite,Colleen Cassady St. Clair,Evelyn H. Merrill +5 more
TL;DR: What types of long-term data are needed to demonstrate empirically which factors determine the relative costs and benefits to using migratory versus resident tactics and those studying migration are urged to meet these challenges in the interest of conserving partially migratory populations.
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Geographical expansion of Northeast Atlantic mackerel (Scomber scombrus) in the Nordic Seas from 2007 to 2016 was primarily driven by stock size and constrained by low temperatures
Anna H. Olafsdottir,Kjell Rong Utne,Jan Arge Jacobsen,Teunis Jansen,Guðmundur J. Óskarsson,Leif Nøttestad,Bjarki Þór Elvarsson,Cecilie Broms,Aril Slotte +8 more
TL;DR: In this article, the authors explored how spawning stock biomass and environmental conditions influenced the expansion of mackerel distribution in Nordic Seas from 1997 to 2016 using data from scientific surveys conducted in the Nordic Seas, and concluded that geographical expansion of Mackerel during the summer feeding season was driven by increasing mackefish stock size and constrained by availability of preferred temperature and abundance of mesozooplankton.
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Baleen whale distributions and prey associations in the Barents Sea
TL;DR: Ecosystem-scale associations indicated that krill was the predominant prey species in the Barents Sea in this season, but contrasting mesoscale associations with their prey in 50 km grid cells and a preference for shallow northern banks suggests that these whales have a diverse diet within a pre- ferred habitat.
References
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Principles and Procedures of Statistics.
Book
Animal dispersion in relation to social behaviour
TL;DR: Wynne-Edwards has written this interesting and important book as a sequel to his earlier (1962) Animal Dispersion in Relation to Social Behaviour, and reviewing it has proven to be a valuable task for one who normally is only at the periphery of the group selection controversy.