Comparative Foraging Success between Adult and One-Year-Old Roseate and Sandwich Terns

Shealer, David A.; Burger, Joanna

doi:10.2307/1521403

Cited by 23 publications

(16 citation statements)

References 11 publications

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“…Again, this result agrees with those of studies from colonies in the United States, in which the diets of chicks were also dominated by sand lance (Richards and Schew 1989, Safina et al 1990, Heinemann 1992, Nisbet and Spendelow 1999 up to and including the post-fledging period Kress 1994, Watson andHatch 1999). At colonies located outside of the United States, studies have shown that the diets of chicks are also dominated by a few prey species (Randall and Randall 1978, Shealer and Kress 1994, Shealer and Burger 1995, Shealer 1998, Ramos 2000; however, the prey species vary depending on the colony location. The Roseate Tern at Country Island shares a similar reliance on sand lance as do individuals nesting at other sites in the northeastern United States, indicating that this may be characteristic of this breeding population.…”

Section: Discussionsupporting

confidence: 88%

Foraging Habitat and Chick Diets of Roseate Tern, Sterna dougallii, Breeding on Country Island, Nova Scotia

Rock¹,

Leonard²,

Boyne³

2007

ACE

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Section: Discussionsupporting

confidence: 88%

Foraging Habitat and Chick Diets of Roseate Tern, Sterna dougallii, Breeding on Country Island, Nova Scotia

Rock¹,

Leonard²,

Boyne³

2007

ACE

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“…Low apparent survival and high annual variation in subadult non-breeders is due to both a lack of experience in younger birds on their first overwintering and migratory trips (Saether 1990;Ezard et al 2006) and a lower foraging efficiency (Dunn 1972;Shealer and Burger 1995). These factors explain why inexperienced Common Terns are more susceptible to changes in environmental conditions (Dittmann and Becker 2003;Bauch et al 2010).…”

Section: Survival Ratesmentioning

confidence: 99%

Terns in trouble: demographic consequences of low breeding success and recruitment on a common tern population in the German Wadden Sea

Szostek

Becker

2011

J Ornithol

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The nationally endangered breeding population of Common Terns Sterna hirundo in the German Wadden Sea has been rapidly declining in recent years. In an attempt to identify the causes for this decline we analysed the demography of the Jade Bay population based on the ''Banter See'' colony. This colony has been intensively studied for over 18 years and has been declining in recent years. We estimated apparent survival rates of breeders and nonbreeders of different ages using multi-state capture-recapture models based on individual life histories. The population growth rates of the Banter See colony and Lower Saxony population were estimated, and possible future trajectories were projected using a matrix model approach. Adult survival rates (0.9) have remained constant, but since 2002 subadult survival has decreased significantly (0.36-0.28). We found significantly lower breeding success as well as lower and delayed recruitment. These changes in vital rates probably caused the shift in the Banter See colony growth rate from an increasing phase before 2002 to a declining phase after and most likely occurred due to low pelagic prey fish stocks in the North Sea, the most important food source for terns in the Wadden Sea. Should the population decline continue at the current rates, the Banter See colony could decrease by 11% and the Lower Saxony Wadden Sea population by an alarming 57% between 2009 and 2015. Keywords Seabird Á Breeding success Á Recruitment Á Age-dependent survival Á Demography Á Multi-state model Zusammenfassung Seeschwalben mit Problemen: Demographische Konsequenzen von geringem Bruterfolg und geringer Rekrutierung in einer Flussseeschwalben-Population im Deutschen Wattenmeer Die Brutpopulation der Flussseeschwalbe Sterna hirundo im niedersächsischen Wattenmeer hat in den letzten Jahren einen starken Rückgang erfahren. Diese Entwicklung ist bedenklich, da diese Art seit 2007 auf der Roten Liste als stark gefährdet eingestuft wird. Um Ursachen für den Rückgang in der Zahl der Brutpaare festzustellen, wurde in dieser Studie die Demographie der Flussseeschwalbenpopulation am Jadebusen untersucht, mit besonderem Augenmerk auf die Kolonie ,,Banter See'' in Wilhelmshaven. Diese Kolonie wird seit über 18 Jahren eingehend untersucht und zeigt ebenfalls einen rückläufigen Trend. Ü berlebensraten von Brütern und Nichtbrütern verschiedener Altersgruppen wurden anhand eines Multi-State Capture-Recapture Modells, basierend auf individuellen Lebensgeschichten, ermittelt. Die Wachstumsrate der Banter See Kolonie wurde in zwei Phasen unterteilt: eine wachsende Phase vor 2002 und eine abnehmende Phase danach. Diese Entwicklung wurde durch Ä nderungen in wesentlichen demographischen Raten hervorgerufen, so wie signifikant geringerer Bruterfolg, signifikant weniger und spätere Rekrutierung und signifikant geringere Ü berlebensraten zweijähriger Vögel seit 2002 (von 36% auf 29%). Die Ü berlebensraten adulter Vögel (90%) Communicated by T. Friedl. Electronic supplementary material The online version of this article (dageg...

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“…In the present study, the estimation of juvenile survival using CMR modeling was made possible due to a substantial number of young roseate terns observable from Age 1 onwards, a situation rather unusual in temperate areas because most birds remain away from the natal site until Age 3 (Gochfeld et al 1998). Substantial numbers of juveniles returning to the natal colony are also frequently observed in other tropical roseate tern populations (Shealer & Burger 1995), a pattern also found in common terns Sterna hirundo breeding in the tropics (LeCroy 1976).…”

Section: Survival Estimates and Temporal Variationmentioning

confidence: 90%

“…So far, the situation encountered is the one where young breeders are sampled for the first time as 2 yr olds or more frequently as 3 yr olds at the colonies (i.e. corresponding to the minimum maturation period), allowing the estimation of young survival over the entire prebreeding period, but not separately for each prebreeding age class (Spendelow et al 2002, Lebreton et al 2003.In larids, although most species start to reproduce for the first time at Age 3 to 4 yr (see Appendix 2 in Schreiber & Burger 2001), a substantial number of nonbreeding prospectors return to the colonies at Age 2 yr (Gochfeld et al 1998, Dittmann & Becker 2003 or in some cases as 1 yr olds (see Shealer & Burger 1995 in roseate tern Sterna dougallii; Cadiou 1999 in kittiwake Rissa tridactyla). Thus, provided that a sufficient number of 1 yr old birds marked at birth are observable at breeding colonies, a modeling of these recapture histories can be developed in a multistate framework to estimate (1) the survival probabilities from fledgling to Age 1 (= juvenile survival) and subsequent (older) age classes, and (2) the probabilities of returning for the first time to the natal colony at Age 1 (nonbreeding prospector) and at older ages.…”

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confidence: 99%

Juvenile survival in a tropical population of roseate terns: interannual variation and effect of tick parasitism

Monticelli¹,

Ramos²,

Hines³

et al. 2008

Mar. Ecol. Prog. Ser.

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Many demographic studies on long-lived seabirds have focused on the estimation of adult survival, but much less is known about survival during the early years of life, especially in tropical species. We report analyses of a capture-recapture dataset of 685 roseate terns ringed as fledglings and adults between 1998 and 2005 on Aride Island, Seychelles, and recaptured/resighted at the same colony site over a 5 yr (2002 to 2006) period. A multistate model was used to estimate survival for different age classes, including juvenile (first-year) birds returning as non-breeding prospectors. The effect of infestation by parasites (ticks) on survival was also examined. Overall, the estimated return of first-year individuals to the natal colony was very variable, ranging from 2 to 22%. Conditioned on survival, the probability of returning from Age 2 yr onwards increased to 70%. Survival rates were best modeled as time-specific, with estimates varying from 0.02 to 1.00 (mean 0.69) in firstyear birds with a marked negative effect of tick infestation. In older birds (minimum age of 2 yr), the annual estimates fell between 0.69 and 0.86 (mean 0.77). Using a components of variance approach for estimation of year-to-year variation, we found high temporal variability for first-year individuals (coefficient of variation [CV] = 65%) compared to much less variation in the survival rate of older birds (CV = 9%). These findings agree with the life-history prediction that demographic rates of juveniles are usually lower and more variable than those of older individuals. Our results are also consistent with the predicted negative effect of tick parasitism on juvenile survival. Compared with data from other roseate tern populations, survival over the first 2 yr (Age 0 to 2 yr) was 18 to 40% higher in this study, suggesting that a high 'young' survival rate may be an important demographic trait in this tropical population to compensate for the low annual reproductive success. Our data show that estimating survival of young individuals may be crucial to elucidating the demographic tactics of seabirds.KEY WORDS: Ectoparasitism · First-year survival · Multistate capture-recapture models · Temporal variability · Sterna dougallii Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 365: [277][278][279][280][281][282][283][284][285][286][287] 2008 that of adults and shows high temporal variation when compared to survival of subsequent age classes (Francis & Saurola 2004, Harris et al. 2007), a pattern also found in mammals (Gaillard et al. 1998(Gaillard et al. , 2000 and turtles (Chaloupka & Limpus 2005). In seabirds, fecundity is the demographic trait most affected by variations in environmental conditions, and adult survival is normally high and stable (Nisbet & Cam 2002) although changes in food availability (Oro & Furness 2002) and large-scale climatic and weather events (e.g. North Pacific Index [NPI], Jones et al. 2002; hurricanes, Spendelow et al. 2002) are known to induce some ...

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Comparative Foraging Success between Adult and One-Year-Old Roseate and Sandwich Terns

Cited by 23 publications

References 11 publications

Foraging Habitat and Chick Diets of Roseate Tern, Sterna dougallii, Breeding on Country Island, Nova Scotia

Foraging Habitat and Chick Diets of Roseate Tern, Sterna dougallii, Breeding on Country Island, Nova Scotia

Terns in trouble: demographic consequences of low breeding success and recruitment on a common tern population in the German Wadden Sea

Juvenile survival in a tropical population of roseate terns: interannual variation and effect of tick parasitism

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