Ibis
Công bố khoa học tiêu biểu
* Dữ liệu chỉ mang tính chất tham khảo
Sắp xếp:
DO TROPICAL BIRDS REAR AS MANY YOUNG AS THEY CAN NOURISH ?Summary.
The thesis that birds lay clutches of eggs which will produce as many nestlings as they can, on the average, adequately nourish, is considered in relation to the Central American avifauna. Birds whose usual rate of bringing food to the nest is s... ...
Ibis - Tập 91 Số 3 - Trang 430-455 - 1949
Do Levant Sparrowhawks Accipiter brevipes also migrate at night?Flight paths of visually identified Levant Sparrowhawks Accipiter brevipes on autumn migration were analysed with a tracking radar in the Arava Valley, Israel. This time of the year there are no significant numbers of other species with a similar wing‐beat pattern. This wing‐beat pattern was found not only in daytime but also frequently at night. It is suggested ... ...
Ibis - Tập 135 Số 3 - Trang 233-236 - 1993
Food provision to nestlings in the Hoopoe Upupa epops: implications for the conservation of a small endangered population in the Swiss AlpsIn an attempt to recognize the possible ecological causes of the decline of a population of Hoopoes Upupa epops in the Swiss Alps, we collected data on resource exploitation. The prey provisioned to nestlings by parents was investigated at four breeding sites using photographs (n = 4353, 80% of which enabled prey identification). Molecrickets Gryllot... ...
Ibis - Tập 143 Số 1 - Trang 2-10 - 2001
Behavioural and morphological correlates of variation in the extent of postjuvenile moult in the SiskinCarduelis spinusSiskins Carduelis spinus show great variation in the acquisition of adult plumage, so that yearling birds can be classified as either “delayed” (i.e. still showing yearling plumage) or “advanced” (i.e. with an adult plumaged appearance). The extent of moult in males is related to the size of their black bib, which in turn is highly correlated with their social dominance rank. Autumn male b... ...
Ibis - Tập 140 Số 4 - Trang 661-669 - 1998
Effects of prey abundance on the foraging behaviour, diving efficiency and time allocation of breeding Guillemots Uria aalgeThe foraging behaviour of Guillemots Uria aalge at sea was compared between 2 years of radically different food abundance. Radio telemetry was used to determine foraging locations and diving patterns. In the poor compared with the good food year, foraging trips were much longer, the birds foraged more than six times further from their breeding sites, they spent o... ...
Ibis - Tập 136 Số 2 - Trang 214-222 - 1994
The winter feeding ecology of Avocets Recurvirostra avosetta on intertidal areas. II. Diet and feeding mechanismsThe diet and feeding methods of Avocets Recurvirostra avosetta using the most common feeding strategy (Normal Feeding Strategy) on emerged intertidal areas in the Tagus estuary, Portugal, were studied during two winters. Avocets using the Normal Feeding Strategy fed non‐selectively in the top 20 mm of sediment, ingesting prey bigger than a minimum... ...
Ibis - Tập 137 Số 1 - Trang 99-108 - 1995
The development and use of individuals‐based models to predict the effects of habitat loss and disturbance on waders and waterfowlCurrent commitments to increase renewable energy generation have led to concern about the possible effects of such developments on shorebirds and waterfowl. To assess the future impact of industrial developments – of changes in the intensity or type of activity on an estuary – or to evaluate the cost effectiveness of proposed mitigating measures, ecologists must be able to predict accurate... ...
Ibis - Tập 148 Số s1 - Trang 158-168 - 2006
THE DOMESTIC FOWL IN ANCIENT EGYPTSUMMARY There is no recorded mention of the domestic fowl in Ancient Egypt before the Middle Kingdom (2134–1786 B.C.). Evidence for its existence there before this time is completely negative. The hieroglyph which is found in the earliest inscriptions, and certain peculiarities in the mention of the indeterminate birds, led some early writers to believe that the fow... ...
Ibis - Tập 108 Số 2 - Trang 217-223 - 1966
THE IMPORTANCE OF CERTAIN ASSEMBLAGES OF BIRDS AS “INFORMATION‐CENTRES” FOR FOOD‐FINDINGSummary Evidence is presented to support the hypothesis that communal roosts, breeding colonies and certain other bird assemblages have been evolved primarily for the efficient exploitation of unevenly‐distributed food sources by serving as “information‐centres”. Predation‐pressure is regarded as being the most important factor “shaping” the assembla... ...
Ibis - Tập 115 Số 4 - Trang 517-534 - 1973
Anthropogenic noise reduces bird species richness and diversity in urban parksAnthropogenic noise is becoming more prevalent in the world and has been shown to affect many animal species, including birds. The impact of such noise was measured in Neotropical urban parks to assess how the noise affects avifauna diversity and species richness. We sampled bird species, and concurrently measured sound pressure (noise) levels (L eq...
Ibis - Tập 159 Số 3 - Trang 638-646 - 2017
Tổng số: 32
- 1
- 2
- 3
- 4