Interannual variations of reproductive parameters in a booted eagle (Hieraaetus pennatus) population: the influence of density and laying date

Martínez, José Antonio; Pagán, Iluminada; Calvo, José F.

doi:10.1007/s10336-006-0086-0

Cited by 17 publications

(14 citation statements)

References 26 publications

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“…Dichlorodiphenyldichloroethylene residues also were higher in nonembryonated than in embryonated eggs in both goshawks and booted eagles, although only significantly so in the first species. In recent years, booted eagle and goshawk populations have decreased by approximately 30% and more than 50%, respectively, in the Murcia region [10]. Although OCs may affect reproductive success in some individuals, OC and PCB concentrations in booted eagle eggs have declined over the same period of time during which the populations have declined.…”

Section: Resultsmentioning

confidence: 99%

“…Since 1991, goshawk ( Accipiter gentilis ) and booted eagle ( Hieraaetus pennatus ) populations have been declining in woodland areas of southeastern Spain, particularly in areas surrounded by agricultural zones that in the past have been treated with OC pesticides [10]. In the case of goshawks, the number of mating couples has dropped from 56 to 70 to a maximum of 20 today, whereas areas occupied by the booted eagle have dropped by 27.6% [10]. The overall aim of the present study was to examine whether OCs might be a causal factor in these declines.…”

Section: Introductionmentioning

confidence: 99%

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Organochlorine residues in booted eagle (Hieraaetus pennatus) and goshawk (Accipiter gentilis) eggs from southeastern Spain

Martínez-López

María-Mójica

Martínez

et al. 2007

Enviro Toxic and Chemistry

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Most organochlorine (OC) use has been banned in Spain, but these compounds are persistent and may still adversely affect predatory birds. Data generally are lacking, however. Residues of hexachlorobenzene, alpha-hexachlorocyclohexane, lindane, hexachloro-octahydro-epoxy-dimethanonaphthalene, DDT, dichlorodiphenyldichloroethane, dichlorodiphenyldichloroethylene (DDE), and polychlorinated biphenyls (PCBs) were measured in 22 failed eggs of booted eagles (Hieraaetus pennatus) and goshawks (Accipiter gentilis) from southeastern Spain; both species are declining in this region. Hexachloro-octahydro-epoxy-dimethanonaphthalene, DDE, and sum PCB congener concentrations were significantly higher in booted eagle than in goshawk eggs, and an inverse relationship was found between shell thickness and DDE concentrations in booted eagles. Organochlorides may have been associated with the failure of some booted eagle eggs, but concentrations in booted eagle and goshawk eggs decreased over the period during which populations have dwindled. Thus, although OCs may be a contributory factor, they are unlikely to be the primary cause of the recent population declines in southeastern Spain.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organochlorine residues in booted eagle (Hieraaetus pennatus) and goshawk (Accipiter gentilis) eggs from southeastern Spain

Martínez-López

María-Mójica

Martínez

et al. 2007

Enviro Toxic and Chemistry

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“…The home range of this pair subsequently declined, and the young grew faster. In contrast, a study of Booted Eagles showed that breeding parameters were density independent (Martínez et al 2006). The occupancy rate of a nesting territory has been recently shown to be a consistent measure of territory quality in a wide range of species, including Black Kites (Milvus migrans) (reviewed by Sergio and Newton 2003;Sergio et al 2007).…”

Section: Discussionmentioning

confidence: 99%

GPS tracking of Red Kites (Milvus milvus) reveals fledgling number is negatively correlated with home range size

Pfeiffer¹,

Meyburg²

2015

J Ornithol

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To date, reliable studies on the spatial area use and home range size of the Red Kite (Milvus milvus) during the breeding season are lacking. Between 2007 and 2014, 43 adult individuals were fitted with GPS transmitters in Germany. The home range sizes of 27 males, which successfully reared 47 broods, ranged between 4.8 and 507.1 km 2 based on the 95 % kernel utilization distribution. The median during the nestling and post-fledging dependent periods was 63.6 km 2 . The home ranges of 12 females, with a total of 21 successful broods, ranged between 1.1 and 307.3 km 2 . Within a single breeding season, there were considerable differences among home range sizes. There was also considerable variation in the home range size of adults during the course of a season. Across years, the median home range size of all males ranged between 21 and 186 km 2 , depending on prey availability. For individual males at the same nest site, the home range size varied up to a factor of 28 across years. Kites with very large home ranges had only one fledgling, which indicates that resources were scarce. Individuals with more nestlings had intermediate-sized to small home ranges. The relationship between the number of fledged young and home range size was modelled using a cumulative logit model. Fifty-six, 37, and 26 % of male kite fixes were beyond a 1, 1.5, and 2 km radius around the nest, respectively. Birds with very small or very large home ranges differed considerably from these average figures. Adults sometimes travel very long distances to visit distant grasslands during and shortly after mowing (up to more than 34 km) from the nest, due to the increased likelihood of prey availability at these sites. In conclusion, home rage size serves as a useful indicator of Red Kite habitat quality, which may provide key conservation information at the wider ecosystem level.

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“…All three species show territorial behavior, nest in trees on large platforms and may alternate territories in different years (Pagán et al 2009). The booted eagle, a trans-Saharan migrant, the bulk of whose European population is located in the Iberian Peninsula, reaches a high population density in the study area (Martínez et al 2006b). In contrast, in the case of the buzzard and the goshawk, the study area represents the southernmost part of their distribution range (del Hoyo et al 1994).…”

Section: Introductionmentioning

confidence: 98%

Territorial occupancy dynamics in a forest raptor community

2010

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A Markovian modeling approach was used to explore territorial interactions among three forest raptors coexisting in a forested natural area in southeast Spain: the booted eagle (Hieraaetus pennatus), the common buzzard (Buteo buteo) and the northern goshawk (Accipiter gentilis). Using field data collected over a period of 12 years, 11 annual transition matrices were built, considering four occupancy states for each territory. The model describes transitional processes (colonization, abandonment, replacement and persistence), permits temporal variations in the transition matrix to be tested, and simulates territorial occupation for a few subsequent years. Parameters for the species and community dynamics were described in terms of turnover times and damping ratio. A perturbation analysis was performed to simulate the effects of changes in the transition probabilities on the stable state distribution. Our results indicate the existence of a stable community, largely dominated by the booted eagles, and described by a time-invariant transition matrix. Despite the stability observed, the territorial system is highly dynamic, with frequent abandonment and colonization events, although interspecific territorial interactions (the replacement of one species by another) are uncommon. Consequently, the three species appear to follow relatively independent occupancy dynamics. Simulation of potential management actions showed that substantial increases in the number of territories occupied by the less common species (goshawk and buzzard) can only be attained if relatively large increases in their reoccupation and colonization rates are considered.

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Interannual variations of reproductive parameters in a booted eagle (Hieraaetus pennatus) population: the influence of density and laying date

Cited by 17 publications

References 26 publications

Organochlorine residues in booted eagle (Hieraaetus pennatus) and goshawk (Accipiter gentilis) eggs from southeastern Spain

Organochlorine residues in booted eagle (Hieraaetus pennatus) and goshawk (Accipiter gentilis) eggs from southeastern Spain

GPS tracking of Red Kites (Milvus milvus) reveals fledgling number is negatively correlated with home range size

Territorial occupancy dynamics in a forest raptor community

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