Density, Range Size and Diet of the European Jay Garrulus glandarius in the Maremma Natural Park, Tuscany, Italy, in Summer and Autumn

Patterson, I. J.; Cavallini, Paolo; Rolando, Antonio

doi:10.2307/3676537

Cited by 20 publications

(31 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Jays were tracked during summer and autumn in 1988 (Patterson, Cavallini & Rolando, 1991) and during spring in 1990 and 1991 (Rolando, Cavallini et al, 1995). This paper presents the results of the radio-tracking study carried out during winter in 1994, 1995 and 1996.…”

Section: Introductionmentioning

confidence: 98%

Factors affecting movements and home ranges in the jay (Garrulus glandarius)

Rolando

1998

Journal of Zoology

View full text Add to dashboard Cite

The winter home ranges, movements and density of the jay Garrulus glandarius in the Maremma Natural Park (Tuscany, Italy) are presented, and compared with those already known for the other seasons. The movements of jays were studied for short periods over 6 years by radiotelemetric techniques (26 home ranges), direct observations of movements from vantage points, and transect counts. Summer and autumn ranges were much larger than spring and winter ones. Incremental area plots and auto-overlap analyses showed that, on average, spring ranges increased in area with time without shifting, whereas winter ranges were rather stable. In both periods, however, some birds moved as¯oaters since the degree of range autooverlap decreased signi®cantly with time. In winter and spring, range sizes of jays inhabiting different habitats were signi®cantly different, being larger in sites with higher habitat heterogeneity. The structure of home ranges was variable in all seasons; birds showed jointed and disjointed ranges, with one or more activity centres, in all the possible combinations. In every season the average degree of range overlap between jays caught at the same site was rather high and overall actual overlap, when non-tagged birds were also considered, was even higher. No territorial behaviour was ever observed. During summer jays moved into the pinewood for the greater part of the day to collect cicadas, Cicada orni, and returned to the maquis in the evening. During autumn birds regularly moved within the maquis or from the maquis to the pinewood to cache oak (Quercus ilex) acorns. No regular long movements between habitats were observed during spring and winter. Direct observations and analyses of pellets suggested that food was abundant and highly diversi®ed throughout the year. Thus, seasonal movements and home ranges were¯exible and mainly controlled by food availability and its distribution in space and time.

show abstract

Section: Introductionmentioning

confidence: 98%

Factors affecting movements and home ranges in the jay (Garrulus glandarius)

Rolando

1998

Journal of Zoology

View full text Add to dashboard Cite

show abstract

“…The calculation of 100% MCPs is an accepted procedure for determining the home range or spatial extent of individuals (see Patterson et al, 1991;Lorenz et al, 2011 for examples). The spatial extent of individuals is important, since it indicates where on the landscape those individuals have travelled and potentially what habitats are in use.…”

Section: Pattern 5: 100% Minimum Convex Polygon (Mcp) Area For Indivimentioning

confidence: 99%

Energetic behavioural-strategy prioritization of Clark’s nutcrackers in whitebark pine communities: An agent-based modeling approach

McLane

Semeniuk

McDermid

et al. 2017

Ecological Modelling

View full text Add to dashboard Cite

“…The study was carried out in the Maremma Natural Park (42° 39' N, 11° 05' E), Tuscany, Italy, in the same areas used by Patterson & Cavallini (1996) and Patterson et al, (1991). The principal habitats were pinewoods, dominated by Pinus pinea and P. pinaster, Mediterranean maquis scrub and olive groves (Fig.…”

Section: Study Area and Methodsmentioning

confidence: 99%

“…After emergence, prédation risk is still high; 24.3% of 222 larval tracks followed across dusty ground ended in an encounter with a predator, most commonly a bird (unpublished data). The adults also suffer a high level of prédation by jays (Patterson et al, 1991) throughout late June and early July, before the sound-level measurements were made. The significant decline in sound level through the study period at many of the sites (Table IV) is also consistent with adult mortality.…”

Section: Estimates Of Adult Cicada Densitymentioning

confidence: 99%

See 1 more Smart Citation

The density of cicadasCicada orniin Mediterranean coastal habitats

Patterson¹,

Massei²,

Genov³

1997

Italian Journal of Zoology

View full text Add to dashboard Cite

The aim of the study was to assess the use of sound level measurement as an index of cicada Cicada orni abundance in Mediterranean coastal habitats, to compare such measurements with indices of larval density at the same sites and to estimate the density of singing males. Sound levels were significantly higher in pinewood than in Mediterranean scrub and were intermediate in olive groves. There was a close correlation between sound level and the number of larval skins per tree, which explained 95% of the variation in sound. Measurements of the sound produced by individual cicadas (mean 97.43 dB at 1 cm) allowed an estimate, by computer simulation, of the density of singing males in July. Mean estimates of 9 861 males per hectare in pinewood and 1 618 in olive grove were obtained. The pinewood values were considerably lower than densities of final-instar larvae, measured in late May, but the discrepancy can be accounted for by larval and adult mortality in the period between the two sets of measurements.

show abstract

Density, Range Size and Diet of the European Jay Garrulus glandarius in the Maremma Natural Park, Tuscany, Italy, in Summer and Autumn

Cited by 20 publications

References 4 publications

Factors affecting movements and home ranges in the jay (Garrulus glandarius)

Factors affecting movements and home ranges in the jay (Garrulus glandarius)

Energetic behavioural-strategy prioritization of Clark’s nutcrackers in whitebark pine communities: An agent-based modeling approach

The density of cicadasCicada orniin Mediterranean coastal habitats

Contact Info

Product

Resources

About