The Experts below are selected from a list of 28440 Experts worldwide ranked by ideXlab platform
D J Ross - One of the best experts on this subject based on the ideXlab platform.
-
mating patterns and reversed size dimorphism in southern skuas stercorarius skua lonnbergi
The Auk, 2002Co-Authors: Richard A Phillips, Deborah A Dawson, D J RossAbstract:Abstract Numerous explanations exist for the evolution of reversed size dimorphism in raptorial species. A recent study concluded that reversed size dimorphism in skuas and jaegers was probably not attributable to breeding-Role Specialization, but that there was evidence for sexual selection, and in particular intrasexual competition by females for males. Our study tested the applicability of those conclusions for Southern (or Brown) Skuas (Stercorarius skua lonnbergi) breeding in South Georgia. Clutch volume was related positively to size and condition of females and negatively to condition of males, but there was no evidence of assortative mating for size or condition within pairs. Potential explanations for the discrepancy between this and previous studies are that size is less closely correlated with individual quality because of highly diverse foraging strategies, territory quality is a confounding factor, or because lower aggression in Southern Skuas reduces the necessity for small females to avoid ...
-
Mating Patterns and Reversed Size Dimorphism in Southern Skuas (Stercorarius skua lonnbergi)
The Auk, 2002Co-Authors: Richard A Phillips, Deborah A Dawson, D J RossAbstract:Abstract Numerous explanations exist for the evolution of reversed size dimorphism in raptorial species. A recent study concluded that reversed size dimorphism in skuas and jaegers was probably not attributable to breeding-Role Specialization, but that there was evidence for sexual selection, and in particular intrasexual competition by females for males. Our study tested the applicability of those conclusions for Southern (or Brown) Skuas (Stercorarius skua lonnbergi) breeding in South Georgia. Clutch volume was related positively to size and condition of females and negatively to condition of males, but there was no evidence of assortative mating for size or condition within pairs. Potential explanations for the discrepancy between this and previous studies are that size is less closely correlated with individual quality because of highly diverse foraging strategies, territory quality is a confounding factor, or because lower aggression in Southern Skuas reduces the necessity for small females to avoid large males.
Richard A Phillips - One of the best experts on this subject based on the ideXlab platform.
-
Seasonal sexual segregation in two Thalassarche albatross species: competitive exclusion, reproductive Role Specialization or foraging niche divergence?
Proceedings of The Royal Society B: Biological Sciences, 2004Co-Authors: Richard A Phillips, Janet R. D. Silk, Ben Phalan, Paulo Catry, John P. CroxallAbstract:Sexual segregation by micro- or macrohabitat is common in birds, and usually attributed to size-mediated dominance and exclusion of females by larger males, trophic niche divergence or reproductive Role Specialization. Our study of black-browed albatrosses, Thalassarche melanophrys, and grey-headed albatrosses, T. chrysostoma, revealed an exceptional degree of sexual segregation during incubation, with largely mutually exclusive core foraging ranges for each sex in both species. Spatial segregation was not apparent during brood-guard or post-guard chick rearing, when adults are constrained to feed close to colonies, providing no evidence for dominance-related competitive exclusion at the macrohabitat level. A comprehensive morphometric comparison indicated considerable species and sexual dimorphism in wing area and wing loading that corresponded, both within and between species, to broad-scale habitat preferences relating to wind strength. We suggest that seasonal sexual segregation in these two species is attributable to niche divergence mediated by differences in flight performance. Such sexual segregation may also have implications for conservation in relation to sex-specific overlap with commercial fisheries.
-
mating patterns and reversed size dimorphism in southern skuas stercorarius skua lonnbergi
The Auk, 2002Co-Authors: Richard A Phillips, Deborah A Dawson, D J RossAbstract:Abstract Numerous explanations exist for the evolution of reversed size dimorphism in raptorial species. A recent study concluded that reversed size dimorphism in skuas and jaegers was probably not attributable to breeding-Role Specialization, but that there was evidence for sexual selection, and in particular intrasexual competition by females for males. Our study tested the applicability of those conclusions for Southern (or Brown) Skuas (Stercorarius skua lonnbergi) breeding in South Georgia. Clutch volume was related positively to size and condition of females and negatively to condition of males, but there was no evidence of assortative mating for size or condition within pairs. Potential explanations for the discrepancy between this and previous studies are that size is less closely correlated with individual quality because of highly diverse foraging strategies, territory quality is a confounding factor, or because lower aggression in Southern Skuas reduces the necessity for small females to avoid ...
-
Mating Patterns and Reversed Size Dimorphism in Southern Skuas (Stercorarius skua lonnbergi)
The Auk, 2002Co-Authors: Richard A Phillips, Deborah A Dawson, D J RossAbstract:Abstract Numerous explanations exist for the evolution of reversed size dimorphism in raptorial species. A recent study concluded that reversed size dimorphism in skuas and jaegers was probably not attributable to breeding-Role Specialization, but that there was evidence for sexual selection, and in particular intrasexual competition by females for males. Our study tested the applicability of those conclusions for Southern (or Brown) Skuas (Stercorarius skua lonnbergi) breeding in South Georgia. Clutch volume was related positively to size and condition of females and negatively to condition of males, but there was no evidence of assortative mating for size or condition within pairs. Potential explanations for the discrepancy between this and previous studies are that size is less closely correlated with individual quality because of highly diverse foraging strategies, territory quality is a confounding factor, or because lower aggression in Southern Skuas reduces the necessity for small females to avoid large males.
Afshin Mehrpouya - One of the best experts on this subject based on the ideXlab platform.
-
Between Regulatory Field Structuring and Organizational Roles: Intermediation in the Field of Sustainable Urban Development
Regulation & Governance, 2018Co-Authors: Joel Bothello, Afshin MehrpouyaAbstract:Recent contributions in the domains of governance and regulation elucidate the importance of rule-intermediation (RI), the Role that organizations adopt to bridge actors playing regulatory or “rule-making” (RM) Roles, and those adopting target or “rule-taking” (RT) Roles. Intermediation not only enables diffusion and translation of regulatory norms, but also allows for the representation of different actors in policy-making arenas. While prior studies have explored the Roles that such RIs adopt to facilitate their intermediation functions, we have yet to consider how field-level structuring processes influence (and are influenced by) the various and changing Roles adopted by RIs. In this study, we focus on the mutually constitutive relations between field-level change processes and the evolving Roles of RIs by studying the rise of ICLEI (International Council for Local Environmental Initiatives/Local Governments for Sustainability), an RI serving as a bridge for sustainable urban development policies between the United Nations and urban authorities. Using ICLEI as an illustrate case, we theorize four different processes of regulatory field consolidation and fragmentation including: problematization, Role Specialization, marketization and orchestrated decentralization. We discuss their implications for the RI Roles in the field and further theorize the changing dynamics of trickle-up intermediation processes as an RI gains power and influence. This is the pre-peer reviewed version of the following article: Bothello, J. and Mehrpouya, A. (2018), Between regulatory field structuring and organizational Roles: Intermediation in the field of sustainable urban development. Regulation & Governance, which has been published in final form at https://doi.org/10.1111/rego.12215. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
-
Between Regulatory Field Structuring and Organizational Roles: Intermediation in the Field of Sustainable Urban Development
2018Co-Authors: Joel Bothello, Afshin MehrpouyaAbstract:Recent contributions in the domains of governance and regulation elucidate the importance of rule-intermediation (RI), the Role that organizations adopt to bridge actors playing regulatory or “rule-making” (RM) Roles, and those adopting target or “rule-taking” (RT) Roles. Intermediation not only enables diffusion and translation of regulatory norms, but also allows for the representation of different actors in policy-making arenas. While prior studies have explored the Roles that such RIs adopt to facilitate their intermediation functions, we have yet to consider how field-level structuring processes influence (and are influenced by) the various and changing Roles adopted by RIs. In this study, we focus on the mutually constitutive relations between field-level change processes and the evolving Roles of RIs by studying the rise of ICLEI (International Council for Local Environmental Initiatives/Local Governments for Sustainability), an RI serving as a bridge for sustainable urban development policies between the United Nations and urban authorities. Using ICLEI as an illustrate case, we theorize four different processes of regulatory field consolidation and fragmentation including: problematization, Role Specialization, marketization and orchestrated decentralization. We discuss their implications for the RI Roles in the field and further theorize the changing dynamics of trickle-up intermediation processes as an RI gains power and influence.
Deborah A Dawson - One of the best experts on this subject based on the ideXlab platform.
-
mating patterns and reversed size dimorphism in southern skuas stercorarius skua lonnbergi
The Auk, 2002Co-Authors: Richard A Phillips, Deborah A Dawson, D J RossAbstract:Abstract Numerous explanations exist for the evolution of reversed size dimorphism in raptorial species. A recent study concluded that reversed size dimorphism in skuas and jaegers was probably not attributable to breeding-Role Specialization, but that there was evidence for sexual selection, and in particular intrasexual competition by females for males. Our study tested the applicability of those conclusions for Southern (or Brown) Skuas (Stercorarius skua lonnbergi) breeding in South Georgia. Clutch volume was related positively to size and condition of females and negatively to condition of males, but there was no evidence of assortative mating for size or condition within pairs. Potential explanations for the discrepancy between this and previous studies are that size is less closely correlated with individual quality because of highly diverse foraging strategies, territory quality is a confounding factor, or because lower aggression in Southern Skuas reduces the necessity for small females to avoid ...
-
Mating Patterns and Reversed Size Dimorphism in Southern Skuas (Stercorarius skua lonnbergi)
The Auk, 2002Co-Authors: Richard A Phillips, Deborah A Dawson, D J RossAbstract:Abstract Numerous explanations exist for the evolution of reversed size dimorphism in raptorial species. A recent study concluded that reversed size dimorphism in skuas and jaegers was probably not attributable to breeding-Role Specialization, but that there was evidence for sexual selection, and in particular intrasexual competition by females for males. Our study tested the applicability of those conclusions for Southern (or Brown) Skuas (Stercorarius skua lonnbergi) breeding in South Georgia. Clutch volume was related positively to size and condition of females and negatively to condition of males, but there was no evidence of assortative mating for size or condition within pairs. Potential explanations for the discrepancy between this and previous studies are that size is less closely correlated with individual quality because of highly diverse foraging strategies, territory quality is a confounding factor, or because lower aggression in Southern Skuas reduces the necessity for small females to avoid large males.
Joel Bothello - One of the best experts on this subject based on the ideXlab platform.
-
Between Regulatory Field Structuring and Organizational Roles: Intermediation in the Field of Sustainable Urban Development
Regulation & Governance, 2018Co-Authors: Joel Bothello, Afshin MehrpouyaAbstract:Recent contributions in the domains of governance and regulation elucidate the importance of rule-intermediation (RI), the Role that organizations adopt to bridge actors playing regulatory or “rule-making” (RM) Roles, and those adopting target or “rule-taking” (RT) Roles. Intermediation not only enables diffusion and translation of regulatory norms, but also allows for the representation of different actors in policy-making arenas. While prior studies have explored the Roles that such RIs adopt to facilitate their intermediation functions, we have yet to consider how field-level structuring processes influence (and are influenced by) the various and changing Roles adopted by RIs. In this study, we focus on the mutually constitutive relations between field-level change processes and the evolving Roles of RIs by studying the rise of ICLEI (International Council for Local Environmental Initiatives/Local Governments for Sustainability), an RI serving as a bridge for sustainable urban development policies between the United Nations and urban authorities. Using ICLEI as an illustrate case, we theorize four different processes of regulatory field consolidation and fragmentation including: problematization, Role Specialization, marketization and orchestrated decentralization. We discuss their implications for the RI Roles in the field and further theorize the changing dynamics of trickle-up intermediation processes as an RI gains power and influence. This is the pre-peer reviewed version of the following article: Bothello, J. and Mehrpouya, A. (2018), Between regulatory field structuring and organizational Roles: Intermediation in the field of sustainable urban development. Regulation & Governance, which has been published in final form at https://doi.org/10.1111/rego.12215. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
-
Between Regulatory Field Structuring and Organizational Roles: Intermediation in the Field of Sustainable Urban Development
2018Co-Authors: Joel Bothello, Afshin MehrpouyaAbstract:Recent contributions in the domains of governance and regulation elucidate the importance of rule-intermediation (RI), the Role that organizations adopt to bridge actors playing regulatory or “rule-making” (RM) Roles, and those adopting target or “rule-taking” (RT) Roles. Intermediation not only enables diffusion and translation of regulatory norms, but also allows for the representation of different actors in policy-making arenas. While prior studies have explored the Roles that such RIs adopt to facilitate their intermediation functions, we have yet to consider how field-level structuring processes influence (and are influenced by) the various and changing Roles adopted by RIs. In this study, we focus on the mutually constitutive relations between field-level change processes and the evolving Roles of RIs by studying the rise of ICLEI (International Council for Local Environmental Initiatives/Local Governments for Sustainability), an RI serving as a bridge for sustainable urban development policies between the United Nations and urban authorities. Using ICLEI as an illustrate case, we theorize four different processes of regulatory field consolidation and fragmentation including: problematization, Role Specialization, marketization and orchestrated decentralization. We discuss their implications for the RI Roles in the field and further theorize the changing dynamics of trickle-up intermediation processes as an RI gains power and influence.
