Über den Einfluß des Brutzyklus auf die Scheitelfedermauser der Brandseeschwalbe(Sterna sandvicensis)

1971 ◽  
Vol 112 (2) ◽  
pp. 230-231
Author(s):  
Hans Wolfgang Nehls
Keyword(s):  
Sterna Sandvicensis

scholarly journals Long-term trends (1989-2013) in the seabird community breeding in the lagoon of Venice (Italy)

2016 ◽  
Vol 85 (2) ◽  
pp. 19
Author(s):  
Francesco Scarton ◽  
Roberto Valle
Keyword(s):  
Sea Level ◽  
Moderate Increase ◽  
Lagoon Of Venice ◽  
Mean Sea Level ◽  
National Importance ◽  
Long Term Trends ◽  
Larus Michahellis ◽  
Larus Melanocephalus ◽  
Sterna Sandvicensis

The community of seabirds breeding in the lagoon of Venice, one of the largest around the Mediterranean, was monitored over the 1989-2013 period. Six species have been recorded (<em>Larus michahellis, Chroicocephalus ridibundus, Larus melanocephalus, Sternula albifrons, Sterna hirundo, Sterna sandvicensis</em>). Over the study period, 346 colonies were surveyed; they were located on saltmarsh islets, dredge islands and other artificial sites, in descending order of importance. Beaches were used only at the beginning of the survey. About 4,900 pairs bred in the 2009-2013 years. The community has been always dominated by <em>L</em>. <em>michahellis</em>; in the 2009-2013, this species and <em>S. sandvicensis</em> comprised about 70% of the total. The longterm trends show moderate increase in the size of the whole community. Contrasting trends were observed in different species, with <em>L. michahellis</em>,<em> S. albifrons</em> and <em>S. sandvicensis</em> stable or increasing, whereas <em>C. ridibundus</em> and <em>S. hirundo</em> were declining. The number of pairs nesting on artificial sites increased over the last 15 years, while those on saltmarsh islets decreased correspondingly. This was possibly a response to the increase of mean sea level and storminess observed in the last twenty-five years. <em>S. albifrons</em> and <em>S. sandvicensis</em> populations reached national importance; the population of the latter species is noteworthy at a Mediterranean level.

The Basis for Individual Recognition By Voice in the Sandwich Tern (Sterna Sandvicensis)

Behaviour ◽  
1968 ◽  
Vol 32 (1-3) ◽  
pp. 150-157 ◽  
Author(s):  
R.E. Hutchison ◽  
W.H. Thorpe ◽  
J.G. Stevenson
Keyword(s):  
Individual Recognition ◽  
Mutual Recognition ◽  
Effective Means ◽  
Bird Species ◽  
Individual Characteristics ◽  
Good Opportunity ◽  
Individual Distinctiveness ◽  
Sandwich Tern ◽  
Sterna Sandvicensis ◽  
The Individual

Abstract1. There is a considerable amount of observational evidence to show that in a number of bird species, especially colony-nesting sea birds, a bird's recognition of its mate and the mutual recognition of parent and young may, in certain circumstances, be based upon individual peculiarities of voice. However, with the exception of a preliminary account of the matter in the Guillemot, (Uria aalge), there is no analytical evidence to support these conclusions. 2. The Sandwich Tern (Sterna sandvicensis) provides good opportunity for study of one aspect of this problem, namely the individual distinctiveness of the 'fish-call' of the returning parent bird. Different individuals were recorded and the results analysed by sound spectrograph. 3. The fish-call is shown to be composed of three segments of sound; each segment displaying individual characteristics of duration, fine structure, pitch etc. The overall relations between them, the "patterning" of the call, is also shown to be characteristic. 4. The extent to which these separate individual characteristics are recognised as distinctive by birds themselves has not been investigated but it is clear that if the fish-call is to be used as an effective means of individual recognition in a large colony the patterning of the call (in the sense of the 'gestalt' or the overall relationship of the component parts) must play a major role.

scholarly journals Foraging Decisions of Sandwich Terns in the Presence of Kleptoparasitising Gulls

The Auk ◽  
2002 ◽  
Vol 119 (2) ◽  
pp. 473-486
Author(s):  
Eric W. M. Stienen ◽  
Alex Brenninkmeijer
Keyword(s):  
Diet Composition ◽  
Prey Selection ◽  
Food Shortage ◽  
Larus Ridibundus ◽  
Foraging Decisions ◽  
Food Losses ◽  
Sterna Sandvicensis ◽  
The 1960S ◽  
Potential Food ◽  
Selection Of

AbstractWe studied prey selection of Sandwich Terns (Sterna sandvicensis) in the presence of kleptoparasitising Black-headed Gulls (Larus ridibundus) on Griend, Dutch Wadden Sea, from 1992 to 1998. Most often, gulls robbed larger sandeels rather than herring from terns. Provided that one parent attends the chick, energy intake would be too low for the chicks' survival if exclusively fed on sandeel. By provisioning an increasing proportion of herring, parent terns could theoretically overcome a potential food shortage when the chicks grow older. However, the proportion of herring did not increase with age of chicks in most years. Instead, parents increased their foraging effort with the growth of their offspring. In years with high proportions of food loss, parents left their chicks unattended at the nest more often. In that way, parents were largely able to counterbalance food shortage of offspring. In 1992 and 1996, when diet composition was unfavorable and food losses to gulls were high, parents left their chicks unattended at the nest for ∼80% of the daylight period. It is argued that the present working level of parents might be higher than in the 1960s.

Sign in / Sign up

Export Citation Format

Share Document