Loggerhead Shrike (Lanius ludovicianus)

2020 ◽  
Author(s):  
Reuven Yosef
Keyword(s):  
Lanius Ludovicianus ◽  
Loggerhead Shrike

Age and experience affect the reproductive success of captive Loggerhead Shrike (Lanius ludovicianus) subspecies

2017 ◽  
Vol 95 (8) ◽  
pp. 547-554 ◽  
Author(s):  
T.L. Imlay ◽  
J.C. Steiner ◽  
D.M. Bird
Keyword(s):  
Reproductive Success ◽  
Wild Population ◽  
Trade Offs ◽  
Age Related ◽  
Captive Populations ◽  
Experienced Male ◽  
Lanius Ludovicianus ◽  
Fledgling Success ◽  
Loggerhead Shrike ◽  
Effect Of Age

Two explanations are often used to interpret the positive relationship between reproductive success and age: (1) trade-offs between current and future breeding and (2) age-related improvements in competence. Captive populations provide a unique opportunity to test these explanations because several mechanisms that result in age-related improvements in competence are managed. We modelled the effect of age and experience on the reproductive success of captive migrant Loggerhead Shrike (Lanius ludovicianus L., 1766) subspecies (formerly Lanius ludovicianus migrans W. Palmer, 1898). Female shrikes had the highest reproductive success during mid-life and lower success at 1–2 years of age and over 10 years. Both experienced male and female shrikes had higher fledgling success than inexperienced individuals. Although captive populations breed in controlled settings with few limitations, this work suggests that both explanations (i.e., trade-offs and age-related improvements in competence) are important for understanding reproductive success. Furthermore, management of the captive shrike population can be informed by these relationships to maximize the number of young produced for release to supplement the wild population.

scholarly journals West Nile Virus Infection in the Eastern Loggerhead Shrike (Lanius ludovicianus migrans): Pathology, Epidemiology, and Immunization

2004 ◽  
Vol 40 (3) ◽  
pp. 538-542 ◽  
Author(s):  
Mads F. Bertelsen ◽  
Rolf-Arne Ølberg ◽  
Graham J. Crawshaw ◽  
Antonia Dibernardo ◽  
L. Robbin Lindsay ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Virus Infection ◽  
West Nile Virus Infection ◽  
West Nile ◽  
Lanius Ludovicianus ◽  
Loggerhead Shrike

scholarly journals The Loggerhead Shrike, Lanius ludovicianus, Linn. [Pl. 237]

1842 ◽  
Vol 4 ◽  
pp. 135-139
Author(s):  
John James Audubon
Keyword(s):  
Lanius Ludovicianus ◽  
Loggerhead Shrike

Integrative assessment of intraspecific diversification in Loggerhead Shrike (Lanius ludovicianus) provides insight on the geographic pattern of phenotypic divergence and process of speciation

2021 ◽  
pp. 497-510
Author(s):  
Amy A. Chabot ◽  
Stephen C. Lougheed
Keyword(s):  
Genetic Variation ◽  
Genetic Differentiation ◽  
Population Divergence ◽  
Dispersal Patterns ◽  
Phenotypic Differentiation ◽  
Geographic Patterns ◽  
Historical Factors ◽  
Lanius Ludovicianus ◽  
Integrative Assessment ◽  
Loggerhead Shrike

Integrated studies of the geographical, ecological, and historical factors that shape intraspecific phenotypic and genetic variation can help us to decipher the processes leading to geographic patterns of population divergence and speciation. We quantify and compare morphological and genetic variation in the Loggerhead Shrike (Lanius ludovicianus Linnaeus, 1766), a broadly distributed passerine in North America with both migratory and non-migratory populations that occupy a diversity of habitats and topographies. The geographic distributions and patterns of differentiation among subspecies suggest that migration has strongly impacted population divergence, including the habit of migrating itself, but also dispersal. Patterns of mitochondrial and nuclear genetic differentiation can be attributed to female-biased dispersal and to increased dispersal rates and distances in migratory populations. Weak phenotypic differentiation among migratory versus migratory and non-migratory populations suggest that migration may more strongly affect morphology than adaptation to local habitats. Our results generally support previous subspecific designations with two notable exceptions. We found little genetic differentiation between two subspecies (Lanius ludovicianus gambeli Ridgway, 1887 and Lanius ludovicianus mexicanus C.L. Brehm, 1854), but identify a new, distinct subspecies, which we refer to as Lanius ludovicianus centralis ssp. nov.

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