Foraging Patterns of Caspian Terns (Sterna caspia) Determined Using Radio-Telemetry

1997 ◽  
Vol 20 (3) ◽  
pp. 429 ◽  
Author(s):  
Jane E. Sirdevan ◽  
James S. Quinn
Keyword(s):  
Radio Telemetry ◽  
Foraging Patterns ◽  
Caspian Terns ◽  
Sterna Caspia

Individual clutch recognition by Caspian terns, Sterna caspia

1987 ◽  
Vol 35 (5) ◽  
pp. 1563-1565 ◽  
Author(s):  
Gary W. Shugart
Keyword(s):  
Caspian Terns ◽  
Sterna Caspia

Caspian Terns (Sterna caspia imperator) at Palmyra, N. J.

The Auk ◽  
1929 ◽  
Vol 46 (4) ◽  
pp. 534-534
Author(s):  
J. T. Emlen,
Keyword(s):  
Caspian Terns ◽  
Sterna Caspia

scholarly journals Redistribution and Growth of the Caspian Tern Population in the Pacific Coast Region of North America, 1981–2000

The Condor ◽  
2004 ◽  
Vol 106 (4) ◽  
pp. 777-790 ◽  
Author(s):  
Robert M. Suryan ◽  
David P. Craig ◽  
Daniel D. Roby ◽  
Nathan D. Chelgren ◽  
Ken Collis ◽  
...  
Keyword(s):  
Pacific Coast ◽  
Survival Rates ◽  
River Estuary ◽  
Population Increase ◽  
Anthropogenic Factors ◽  
Columbia River Estuary ◽  
Breeding Sites ◽  
The Pacific ◽  
Caspian Terns ◽  
Sterna Caspia

AbstractWe examined nesting distribution and demography of the Pacific Coast population of Caspian Terns (Sterna caspia) using breeding records and band recoveries spanning two decades since the first population assessment. Since 1980, population size has more than doubled to about 12 900 pairs, yet the proportion of the population nesting at inland (18%) versus coastal sites (82%) has remained constant. Although the breeding range of the Pacific Coast population has expanded northward into Alaska and farther south in Mexico, there was no net latitudinal shift in the distribution of breeding pairs or new colonies. The distribution of breeding birds among areas changed dramatically, however, with 69% of breeding terns now nesting in Oregon (primarily in the Columbia River estuary) versus 4% during the late 1970s. During the past 20 years, there has continued to be a greater proportion of Caspian Terns breeding at anthropogenic sites compared to natural sites. Estimated annual survival rates for hatch-year and after-third-year birds during 1981– 1998 were greater than during 1955–1980, consistent with the higher rate of population increase in recent decades. Fecundity required to maintain a stable population (λ = 1) was estimated at 0.32–0.74 fledglings pair−1, depending on band recovery probabilities for subadults. Caspian Terns readily moved among breeding sites and rapidly colonized new areas; however, a greater concentration of breeding Caspian Terns among fewer colonies in response to anthropogenic factors is an important conservation concern for this species.Redistribución y Crecimiento de la Población de Sterna caspia en la Región de la Costa Pacífica de América del Norte entre 1981 y 2000Resumen. Se examinó la distribución de anidamientos y la demografía de la población de Sterna caspia en la costa del Pacífico usando registros reproductivos y anillos recobrados de aves marcadas durante dos décadas desde la primera evaluación poblacional. Desde 1980 el tamaño poblacional se duplicó a 12 900 parejas, aunque la proporción de la población anidando en la zona interior (18%) versus la zona costera (82%) permaneció constante. A pesar de que el rango reproductivo de la población costera del Pacífico se expandió hacia el norte llegando a Alaska y hacia el sur hasta México, no hubo un cambio latitudinal neto en la distribución de parejas reproductivas o de nuevas colonias. Sin embargo, la distribución de aves reproductivas entre las áreas cambió dramáticamente, con un 69% de los individuos reproductivos de Sterna caspia anidando ahora en Oregón (principalmente en el estuario del Río Columbia) comparado con un 4% a fines de la década del 70. Durante los últimos 20 años continuó habiendo una mayor proporción de individuos de Sterna caspia anidando en sitios con actividad antropogénica en comparación con áreas naturales. Las tasas de supervivencia anual para aves con menos de un año y aves con más de tres años fueron mayores durante 1981–1998 que durante 1955–1980, lo que es consistente con una mayor tasa de crecimiento poblacional en décadas recientes. La fecundidad requerida para mantener estable la población (λ = 1) se estimó en 0.32–0.74 volantones producidos por pareja, dependiendo de la probabilidad de recuperación de anillos en aves subadultas. Sterna caspia es capaz de moverse entre sitios reproductivos y coloniza nuevas áreas rápidamente. No obstante, una mayor concentración de individuos reproductivos de Sterna caspia en unas pocas colonias, como respuesta a factores antropogénicos, es una importante preocupación para la conservación de esta especie.

Caspian Terns (Sterna caspia) Breed Successfully on a Nesting Raft

1996 ◽  
Vol 19 (1) ◽  
pp. 135 ◽  
Author(s):  
Karen P. Lampman ◽  
Mark E. Taylor ◽  
Hans Blokpoel
Keyword(s):  
Caspian Terns ◽  
Sterna Caspia

Growth and Breeding Biology of Caspian Terns (Sterna caspia) in Two Coastal California Environments

1994 ◽  
Vol 17 (2) ◽  
pp. 153 ◽  
Author(s):  
William A. Schew ◽  
Charles T. Collins ◽  
Thomas E. Harvey
Keyword(s):  
Breeding Biology ◽  
Caspian Terns ◽  
Sterna Caspia

scholarly journals Movement syndromes of a Neotropical frugivorous bat inhabiting heterogeneous landscapes in Brazil

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Patricia Kerches-Rogeri ◽  
Danielle Leal Ramos ◽  
Jukka Siren ◽  
Beatriz de Oliveira Teles ◽  
Rafael Souza Cruz Alves ◽  
...  
Keyword(s):  
Site Fidelity ◽  
Animal Movement ◽  
Radio Telemetry ◽  
Food Resource ◽  
Movement Behavior ◽  
Movement Activity ◽  
Landscape Features ◽  
Heterogeneous Landscapes ◽  
Movement Data ◽  
High Site

Abstract Background There is growing evidence that individuals within populations can vary in both habitat use and movement behavior, but it is still not clear how these two relate to each other. The aim of this study was to test if and how individual bats in a Stunira lilium population differ in their movement activity and preferences for landscape features in a correlated manner. Methods We collected data on movements of 27 individuals using radio telemetry. We fitted a heterogeneous-space diffusion model to the movement data in order to evaluate signals of movement variation among individuals. Results S. lilium individuals generally preferred open habitat with Solanum fruits, regularly switched between forest and open areas, and showed high site fidelity. Movement variation among individuals could be summarized in four movement syndromes: (1) average individuals, (2) forest specialists, (3) explorers which prefer Piper, and (4) open area specialists which prefer Solanum and Cecropia. Conclusions Individual preferences for landscape features plus food resource and movement activity were correlated, resulting in different movement syndromes. Individual variation in preferences for landscape elements and food resources highlight the importance of incorporating explicitly the interaction between landscape structure and individual heterogeneity in descriptions of animal movement.

scholarly journals Use of a spatially explicit individual-based model to predict population trajectories and habitat connectivity for a reintroduced ursid

Oryx ◽  
2021 ◽  
pp. 1-10
Author(s):  
Desiree Andersen ◽  
Yoonjung Yi ◽  
Amaël Borzée ◽  
Kyungmin Kim ◽  
Kwang-Seon Moon ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Radio Telemetry ◽  
Suitable Habitat ◽  
Large Carnivores ◽  
Environmental Interactions ◽  
Dispersal Capability ◽  
The Republic ◽  
Suitable Habitats ◽  
Mixed Modelling ◽  
Population Equilibrium

Abstract Reintroductions of large carnivore species present unique opportunities to model population dynamics as populations can be monitored from the beginning of a reintroduction. However, analysis of the population dynamics of such reintroduced populations is rare and may be limited in incorporating the complex movements and environmental interactions of large carnivores. Starting in 2004, Asiatic black bears Ursus thibetanus were reintroduced and tracked in the Republic of Korea, along with their descendants, using radio telemetry, yielding 33,924 tracking points over 12 years. Along with information about habitat use, landscape, and resource availability, we estimated the population equilibrium and dispersal capability of the reintroduced population. We used a mixed modelling approach to determine suitable habitat areas, population equilibria for three different resources-based scenarios, and least-cost pathways (i.e. corridors) for dispersal. Our population simulations provided a mean population equilibrium of 64 individuals at the original reintroduction site and a potential maximum of 1,438 individuals in the country. The simulation showed that the bear population will disperse to nearby mountainous areas, but a second reintroduction will be required to fully restore U. thibetanus. Northern suitable habitats are currently disconnected and natural re-population is unlikely to happen unless supported. Our methodologies and findings are also relevant for determining the outcome and trajectories of reintroduced populations of other large carnivores.

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