Diets of Kauai’s invasive rose-ringed parakeet (Psittacula krameri): evidence of seed predation and dispersal in a human-altered landscape
نویسندگان
چکیده
منابع مشابه
Effect of photoperiod on the adrenal activities of male rose ringed parakeet, Psittacala krameri.
Adult male rose ringed parakeets were exposed to very long photoperiod (22 hr L: 2 hr D) and very short photoperiod (2 hr L: 22 hr D) daily for 60 days during different phases of the annual testicular cycle. Adrenal activities of the experimental birds were compared with that of parallel held natural photoperiodic birds. Marked atrophy of adrenocortical cells was noted in the glands of long pho...
متن کاملSeed predation, not seed dispersal, explains the landscape-level abundance of an early-successional plant
JOHN L. ORROCK, DOUGLAS J. LEVEY*, BRENT J. DANIELSON† and ELLEN I. DAMSCHEN‡ Ecology and Evolutionary Interdepartmental Graduate Program, 353 Bessey Hall, Iowa State University, Ames, IA 50011, USA, * Department of Zoology, University of Florida, Gainesville, FL 32611-8525, USA, † Ecology, Evolution, and Organismal Biology Department, Iowa State University, Ames, IA 50011, USA, and ‡ Departmen...
متن کاملExperimental evidence of impacts of an invasive parakeet on foraging behavior of native birds
Resource competition is one potential behavioral mechanism by which invasive species can impact native species, but detecting this competition can be difficult due to the interactions that variable environmental conditions can have on species behavior. This is particularly the case in urban habitats where the disturbed environment can alter natural behavior from that in undisturbed habitats. Th...
متن کاملPost-dispersal weed seed predation in Michigan crop fields as a function of agricultural landscape structure
Weed seed predation by invertebrates and vertebrates was compared between a simple (large crop fields embedded in a matrix of widely scattered woodlots and hedgerows) and a complex (small crop fields embedded in a matrix of numerous hedgerows and woodlots) agricultural landscape in southern Michigan. The structural differences between landscapes were evaluated by analysis of aerial photographs ...
متن کاملAlien invasive birds.
A bird species is regarded as alien invasive if it has been introduced, intentionally or accidentally, to a location where it did not previously occur naturally, becomes capable of establishing a breeding population without further intervention by humans, spreads and becomes a pest affecting the environment, the local biodiversity, the economy and/or society, including human health. European St...
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ژورنال
عنوان ژورنال: Biological Invasions
سال: 2017
ISSN: 1387-3547,1573-1464
DOI: 10.1007/s10530-017-1636-5