Over-wintering strategies of the Lesser Sheathbill Chionis minor in an impoverished and insular environment

  title={Over-wintering strategies of the Lesser Sheathbill Chionis minor in an impoverished and insular environment},
  author={Christophe Verheyden and Pierre JouventinP. Jouventin},
SummaryThe Lesser Sheathbill Chionis minor is an opportunistic predator and scavenger that breeds on sub-Antarctic islands during the summer season, when many other seabirds are present, especially penguins on which it is kleptoparasitic. It is a poor flyer and over-winters on its breeding grounds, where it faces a diminished food supply and low temperatures. Its foraging behaviour was suspected to be plastic enough to respond to such a variable environment, and we show how this species… 

Time-Activity Budget of the Snowy Sheathbill (Chionis albus) Wintering at a Sea Lion (Otaria flavescens) Haul-Out in Argentina

Abstract. This work aims to provide information regarding the behavioral ecology of the least studied of the two sheathbill species, the Snowy Sheathbill (Chionis albus), wintering in northern

Long-term survival rates in colour-ringed shorebirds – practical considerations in the application of mark–recapture models

Capsule Serious violations of the model assumptions were seen. Aims To illustrate the manner in which violations of the mark–recapture model assumptions may occur. Methods Attempts were made to model

Abundance and breeding distribution of seabirds in the northern part of the Danco Coast, Antarctic Peninsula

Monitoring of breeding populations of seabirds in the northern sector of the Danco Coast, north-west of the Antarctic Peninsula, during the breeding season 2010/11 highlighted the need to maintain basics monitoring studies.

Ego network analysis of the trophic structure of an island land bird through 300 years of climate change and invaders

  • J. Olesen
  • Environmental Science
    Ecology and evolution
  • 2022
Abstract Ego net analysis is a well‐known practice in social sciences, where an ego net (EN) consists of a focal node, the ego, and its links to other nodes, called alters, and alter–alter links may



Foraging behaviour of Lesser Sheathbills Chionis minor exploiting invertebrates on a sub-Antarctic island

The exploitation of terrestrial invertebrates by sheathbills was interpreted as an expansion of the population's trophic niche to tap an underexploited resource on a species-poor island.

Winter territoriality in lesser sheathbills on breeding grounds at Marion Island

Examination of ways in which territoriality during the winter non-breeding season might benefit Lesser Sheathbills on sub-Antarctic Marion Island in the Indian Ocean finds territorial defense, involving both sexes, appeared to be equally vigorous in winter.

Time Budgets, Energy Needs and Kleptoparasitism in Breeding Lesser Sheathbills (Chionis minor)

Time and energy demands of adult Lesser Sheathbills while they are rearing chicks are reported, whether breeding is theoretically possible if the birds have no access to penguins, and the effects of kleptoparasitism on the breeding penguins are estimated.

Satellite tracking of Wandering albatrosses

ALTHOUGH the study of seabirds in their land-based breeding colonies has attracted much attention, an understanding of their ecology at sea, particularly their foraging range and the location of

Age-dependent survival of breeding short-tailed shearwaters Puffinus tenuirostris

(1) A small population of short-tailed shearwaters has been monitored each year since 1947. Survival rates have been calculated from the disappearance of marked individuals and related to breeding


Males were larger than females in all dimensions but were otherwise similar in external appearance and external features of the head and the voice could be used to differentiate adults, subadults and juveniles in the field.

The Niche-Relationships of the California Thrasher

The seemingly impossible was made a practical certainty, for the keeper of a bantam found the body of a screech owl with the claws of one foot firlnly imbedded in theBody of the bantam.

Status and Conservation of the World's Seabirds

The problem of over-abundance, real or imagined, of large wild mammals was considered at a conference in Hyannis, Massachusetts, in 1980 and the results were published by Academic Press in Problems

Age-specificity of black-capped chickadee survival rates: analysis of capture-recapture data

Evidence of declining adult survival probabilities with age for any bird species is found using data from a wintering Black—capped Chickadee population in Connecticut, which has been studied by Loery for 26 yr.

The Ecological Niche

An example illustrating the ecological niche is afforded by the distribution of the plankton copepod Limnocalanus macrurus, a freshwater relict derived from the marine arctic species L. Grimaldii, which will therefore during summer stagnation live between the upper waters which are too warm and the lower waters which is too depleted of oxygen.