Sex-Related Seasonal Differences in the Foraging Strategy of the Kentish Plover

Castro, Macarena; Masero, José A.; Pérez-Hurtado, Alejandro; Amat, Juan A.; Megina, César

doi:10.1525/cond.2009.080062

Cited by 14 publications

(12 citation statements)

References 26 publications

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“…Over the course of two winter seasons, plovers spent a majority of their time foraging -on average of 64.9% of their time -and nearly all the rest of their time roosting (35.2%). This is in contrast to the findings of Castro et al (2009), who found that wintering female Kentish plovers spent an average of 42.70±.02% of the day foraging, while males spent an average of 43.60±.01% of the day foraging. The differences in time spent foraging may have been due to the difference in size and energetic value between flies and ragworms.…”

Section: Winter Behaviorcontrasting

confidence: 99%

“…In a similar system of salt ponds and adjacent bay habitat, Spanish researchers had very different findings for the closely related Kentish plover, Charadrius alexandrinus alexandrinus. They found that plovers utilized mudflats for foraging the majority of time during the winter, mainly foraging upon ragworm, Nereis diversicolor, with aquatic beetles of the genus Octhebius supplementing their diet (Castro et al, 2009). Plovers in the South Bay are known to forage in exposed mudflats at low tide, but there is no information to suggest that they spend such a significant amount of time foraging in mudflats during the winter.…”

Section: Invertebrate Availabilitymentioning

confidence: 99%

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Factors Affecting Western Snowy Plover Winter Foraging Habitat Selection in San Francisco Bay Ponds

Pearl¹

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nivosus nivosus) nest and winter in former salt ponds. They face a number of threats including human-altered habitats and high levels of predation by mesopredators and raptors. The South Bay Salt Pond Restoration Project (the Project) is a large wetland restoration project that will change and potentially eliminate Snowy Plover habitat in the region. As the Project returns salt ponds to tidal wetland, there will be less of the dry, flat, and sparsely vegetated habitat that plovers need for breeding and wintering habitat. A greater understanding of the specific microhabitat requirements for high quality plover foraging sites is needed. In particular, it is important for managers to understand what constitutes high quality wintering habitat for Snowy Plover numbers. This study assessed the characteristics at sites where Snowy Plovers winter in former salt ponds, especially habitat traits related to promoting plover foraging. Analysis of plover foraging habitat showed that plovers were associated with increasing plant height, water cover, and distance from perches and levees. This information is designed to inform restoration and management decisions in efforts to meet Snowy Plover recovery goals in the South San Francisco Bay. v ACKNOWLEDGEMENTS This Masters project would not have been possible without the help and guidance of many people. I owe a great debt of gratitude to my family. My parents always stressed the importance of academic excellence, constantly pushing me to produce my finest work. My siblings Jacob and Rachel were my role models growing up, setting an example for me to follow throughout my educational career. My fiancé Erica Goldsworthy provided a tremendous amount of love and support while I worked on completing my degree, allowing me to focus much of my time and energy on my work. My professors at San Jose State University were instrumental in the quality and focus of this project. My thesis advisor Dr. Lynne Trulio was a guiding voice of knowledge and wisdom throughout. Her advising greatly improved the quality of this thesis throughout. Dr. Rachel O'Malley provided early instruction on field methods, and later gave valuable advice concerning invertebrate trapping, identification, and analysis. Lastly, I would like to thank everyone at San Francisco Bay Bird Observatory (SFBBO) for the various ways in which they assisted in my professional and academic growth. Dr. Cat Burns hired me at SFBBO as an intern for the 2013 Snowy Plover breeding season and Snowy Plover biologist during the 2014-2015 breeding seasons. She provided excellent technical knowledge on plover population dynamics and theory that greatly improved the scientific background of this work. Karine Tokatlian, my manager and trainer while at SFBBO, played an especially critical role. Her mentoring and guidance allowed me to become a well rounded, yet highly specialized field worker, without which I would not have been able to conduct the field work for this project. vi

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Section: Winter Behaviorcontrasting

confidence: 99%

Section: Invertebrate Availabilitymentioning

confidence: 99%

Factors Affecting Western Snowy Plover Winter Foraging Habitat Selection in San Francisco Bay Ponds

Pearl¹

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“… The long recesses from incubation, likely to be feeding recesses, recorded by dummy eggs were more frequent during low tide, as is also the case in other species feeding mostly in intertidal areas (Castro et al . ). More generally, the time budget obtained by GPS tracking is highly dependent on tide level, which in particular was associated with the proportion of time spent foraging (Fig.…”

Section: Discussionmentioning

confidence: 97%

Low incubation investment in the burrow‐nesting Crab PloverDromas ardeolapermits extended foraging on a tidal food resource

Marchi

Chiozzi

Dell’Omo

et al. 2014

Ibis

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We used GPS data-loggers, video-recordings and dummy eggs to assess whether foraging needs may force the low incubation attentiveness (< 55%) of the Crab Plover Dromas ardeola, a crab-eating wader of the Indian Ocean that nests colonially in burrows. The tidal cycle was the major determinant of the time budget and some foraging trips were more distant from the colony than previously known (up to 26 km away and lasting up to 45 h). The longest trips were mostly made by off-duty parents, but on-duty parents also frequently left the nest unattended while foraging for 1-7 h. However, the time spent at the colony area (47%) and the time spent roosting on the foraging grounds (16%) would have allowed almost continuous incubation, as in other species with shared incubation. Therefore, the low incubation attentiveness is not explained by the need for long foraging trips but is largely dependent on a high intermittent rhythm of incubation with many short recesses (5.8 AE 2.6 recesses/h) that were not spent foraging but just outside the burrow or thermoregulating at the seashore. As a result, the eggs were warmed on average only 1.7°C above burrow temperature, slightly more during high tide periods and when burrow temperature was lower between 20:00 and 10:00 h, only partly counteracting the temperature fluctuations of the incubation chamber. These results suggest that low incubation attentiveness is due to the favourable thermal conditions provided by safe nesting burrows and by the hot tropical breeding season, a combination that allows simultaneous foraging by parents and the exploitation of distant foraging grounds. Why Crab Plovers engage in many short recesses from incubation still remains to be clarified but the need to thermoregulate at the seashore and to watch for predators may play a role.

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“…En la Bahía de Cádiz no se constataron cambios estacionales en la composición de la dieta (Castro, 2001). En la Bahía de Cádiz, el poliqueto Nereis diversicolor representa más del 80% de la biomasa consumida durante la estación reproductora y durante el invierno (Castro et al, 2009) También consumen larvas de coleópteros y dípteros, así como pequeños moluscos (Castro et al, 2003).…”

Section: Dietaunclassified

“…Los chorlitejos resuelven el conflicto entre buscar alimento en la zona intermareal y nidificar en las salinas acortando el tiempo de búsqueda de alimento con lo que minimizan el tiempo fuera de la zona de nidificación. Hay diferencias entre sexos en el tiempo dedicado a la búsqueda de alimento, observándose que las hembras emplean dos horas menos que los machos y concentran su actividad de alimentación en las horas centrales de marea baja (Castro et al, 2009) 1 .…”

Section: Dietaunclassified

Apparent Survival and Long-Term Population Growth Rate of The Kentish Plover Charadrius alexandrinus in Mallorca, Archipelago, Spain

Garcias¹,

Tavecchia

2018

Ardeola

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Sex-Related Seasonal Differences in the Foraging Strategy of the Kentish Plover

Cited by 14 publications

References 26 publications

Factors Affecting Western Snowy Plover Winter Foraging Habitat Selection in San Francisco Bay Ponds

Factors Affecting Western Snowy Plover Winter Foraging Habitat Selection in San Francisco Bay Ponds

Low incubation investment in the burrow‐nesting Crab PloverDromas ardeolapermits extended foraging on a tidal food resource

Apparent Survival and Long-Term Population Growth Rate of The Kentish Plover Charadrius alexandrinus in Mallorca, Archipelago, Spain

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