Trophic Structure of Raptor Communities: A Three-Continent Comparison and Synthesis

Marti, Carl D.; Korpimäki, Erkki; Jaksić, Fabián M.

doi:10.1007/978-1-4615-9582-3_2

Cited by 56 publications

(51 citation statements)

References 197 publications

(165 reference statements)

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“…Por consiguiente, las especies se agrupan en el espacio del nicho para minimizar la competencia difusa, ya que es más eficiente competir con unas pocas especies convergentes que enfrentar la competencia con un número mayor de especies con requerimientos más o menos similares. Esta explicación es la que recibió más atención en la literatura ecológica (e.g., Pianka 1978, véanse Jaksic 1981, Jaksic y Delibes 1987, Wiens 1989a, Marti et al 1993a). …”

Section: Organización Gremialunclassified

“…Esta hipótesis no requiere de la acción de la competencia interespecífica; las especies convergen en la utilización de los únicos recursos que están disponibles. En este caso, las respuestas oportunistas individuales de las especies podrían modular la estructura gremial (Jaksic y Braker 1983, Marti et al 1993a. Sin embargo, la existencia de discontinuidades en los recursos no está reñida con la posibilidad de que la competencia sea fuerte entre las especies que se agrupan (i.e., las discontinuidades son las que promueven la estructura gremial, pero la competencia es un proceso que actúa dentro de cada gremio).…”

Section: Organización Gremialunclassified

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Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina

et al. 2017

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Section: Organización Gremialunclassified

Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina

et al. 2017

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“…During periods when prey availability limits populations, exploitative competition with other carnivores could influence goshawk abundance and distribution. A number of avian and mammalian predators consume prey taken by goshawk, and potential competitors include lynx (Lynx rufus) (Ward and Krebs 1985) and great horned owls (Marti et al 1993). The link between great horned owls and goshawks through consumption of similar prey was illustrated in studies of cyclic prey populations in Canada (Rusch et al 1972).…”

Section: Systematics-inmentioning

confidence: 99%

Conservation assessment for the northern goshawk in southeast Alaska.

Iverson¹,

Hayward²,

Titus³

et al. 1996

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The conservation status of northern goshawks in southeast Alaska is examined through developing an understanding of goshawk ecology in relation to past, present, and potential future habitat conditions in the region under the current Tongass land management plan. Forest ecosystem dynamics are described, and a history of forest and goshawk management in the Tongass National Forest is reviewed. Nearly 900,000 acres of the most productive old-growth temperate rain forest in southeast Alaska (public and private lands) have been harvested during the past 90 years and changed to early seral conifer forests. Goshawk habitat relations are described through a review of the goshawk literature. Significant preliminary findings of a habitat relation study in southeast Alaska include the following: goshawks select productive old-growth forests with > 60 percent of all adult goshawk telemetry relocations occurring in this cover type; nonforest, clearcut, and alpine cover types were least used and were avoided relative to their availability; and the median breeding season minimum convex polygon use areas of adult goshawks was about 10,000 acres. Goshawks predominantly use gentle slopes (70 percent of relocations) at elevations below 800 feet (54-74 percent of relocations); 24 percent of relocations occurred in riparian habitat zones, and nearly 20 percent of all relocations occurred within the beach fringe habitat extending 1,000 feet inland from the ocean shoreline. Goshawk nesting habitat is a nonrandom subset of the landscape with a significantly higher proportion of productive old-growth forest within a 600-acre analysis area surrounding known nests. The probability of persistence of goshawks has declined over the past 50 years owing to habitat loss and likely will continue to decline under current management plan regimes; however, the goshawk population likely is not in immediate peril. The predicted consequences of several alternative habitat management approaches are compared. This analysis suggests that long rotation forestry (e.g., 300 years) and uneven-aged silvicultural management may maintain habitat characteristics important to sustaining goshawk populations well distributed across the region. Although habitat reserves are not considered an essential component of a forest-wide goshawk conservation strategy, reserves, in combination with extended rotations, may be important where the intensity of past management actions has precluded the opportunity to attain a desired combination of forest age classes achieveable under long rotations. Revision efforts for the TLMP resumed in fall 1994 with a focus on five major land management issues considered to be inadequately addressed in the existing TLMP: wildlife viability, fish and riparian habitat, caves and karst, alternatives to clearcutting, and socioeconomic considerations. Goshawk conservation is an important component within the wildlife viability issue.Concern for goshawk population viability in southeast Alaska evolved during the past decade and culminated with th...

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“…Given the published literature indicating that both eagles consume rabbits, we concluded that there was potential for interspecific competition. Studies of dietary relationships between raptor species are often performed at a regional as opposed to a local scale, and it is assumed that niche overlap indicates potential competition (Jaksić 1983, Jaksić and Delibes 1987, Marti et al 1993, Burton and Olsen 1997, Garcia and Arroyo 2005, Olsen et al 2006a. However, to clearly understand the effect of competition, studies should occur at a local scale, between neighboring pairs (Steenhof and Kochert 1985, 1988, Marti et al 1993.…”

mentioning

confidence: 99%

“…Studies of dietary relationships between raptor species are often performed at a regional as opposed to a local scale, and it is assumed that niche overlap indicates potential competition (Jaksić 1983, Jaksić and Delibes 1987, Marti et al 1993, Burton and Olsen 1997, Garcia and Arroyo 2005, Olsen et al 2006a. However, to clearly understand the effect of competition, studies should occur at a local scale, between neighboring pairs (Steenhof and Kochert 1985, 1988, Marti et al 1993. Studies of this sort are less common (e.g., Nilsson 1984), and few have been undertaken for Australian raptors (Olsen et al 2006a(Olsen et al , 2006b, although Aumann (2001c) compared mean prey weight, dietary diversity (Shannon's Index) and dietary overlap (Pianka's Index) for a suite of diurnal raptors including WTE and LE.…”

mentioning

confidence: 99%

Diets of Wedge-tailed Eagles (Aquila audax) and Little Eagles (Hieraaetus morphnoides) Breeding Near Canberra, Australia

Olsen¹,

Judge²,

Fuentes³

et al. 2010

Journal of Raptor Research

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Trophic Structure of Raptor Communities: A Three-Continent Comparison and Synthesis

Cited by 56 publications

References 197 publications

Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina

Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina

Conservation assessment for the northern goshawk in southeast Alaska.

Diets of Wedge-tailed Eagles (Aquila audax) and Little Eagles (Hieraaetus morphnoides) Breeding Near Canberra, Australia

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