scholarly journals Foraging Ecology Differentiates Life Stages and Mercury Exposure in Common Terns ( Sterna hirundo )

2020 ◽  
Author(s):  
Annie M Bracey ◽  
Matthew A Etterson ◽  
Frederick C Strand ◽  
Sumner W Matteson ◽  
Gerald J Niemi ◽  
...  
Keyword(s):  
Foraging Ecology ◽  
Mercury Exposure ◽  
Sterna Hirundo ◽  
Life Stages ◽  
Common Terns

Common Terns Raise Young from Successive Broods

The Auk ◽  
1984 ◽  
Vol 101 (2) ◽  
pp. 274-280 ◽  
Author(s):  
Helen Hays
Keyword(s):  
Breeding Season ◽  
Sterna Hirundo ◽  
Feeding Rates ◽  
Male And Female ◽  
Common Terns ◽  
Second Clutch

Abstract In this paper I report the first instance of a pair of Common Terns (Sterna hirundo) raising young in successive clutches during one breeding season and discuss this phenomenon in relation to male and female incubation and feeding rates and to predation. Five other pairs are noted in which the female and sometimes the male incubated a second clutch while still feeding one young from their first nest.

Nest taphonomy of common terns (Sterna hirundo) on Poplar Island, Chesapeake Bay, Maryland

2013 ◽  
Vol 26 (2) ◽  
pp. 155-164 ◽  
Author(s):  
Paula L. Wang ◽  
Frankie D. Jackson ◽  
David J. Varricchio
Keyword(s):  
Chesapeake Bay ◽  
Sterna Hirundo ◽  
Common Terns

Demography and foraging ecology of Chelonia mydas on tropical shallow reefs in Bahia, Brazil

2015 ◽  
Vol 96 (6) ◽  
pp. 1295-1304 ◽  
Author(s):  
Adriana Jardim ◽  
Milagros López-Mendilaharsu ◽  
Francisco Barros
Keyword(s):  
Red Algae ◽  
Foraging Ecology ◽  
Activity Patterns ◽  
Somatic Growth ◽  
Growth Dynamics ◽  
Chelonia Mydas ◽  
Annual Growth Rate ◽  
Life Stages ◽  
Green Turtles ◽  
Spatial Use

Long-term tagging studies, particularly those that target life stages away from nesting beaches can provide important insights in key life history traits, which are essential for the effective management of endangered species. The coast of Bahia hosts important green turtle foraging areas, but information on demography, spatial use and foraging ecology in this region is lacking. Here, we (1) examined the size-class structure of green turtles in Bahia, (2) compared the size distribution from Bahia to other foraging aggregations in Brazil, and (3) studied the somatic growth dynamics. Additionally, we investigated the (4) diet, (5) habitat use and (6) activity patterns of green turtles along shallow reefs in Bahia. From 2009 to 2013, 322 green turtles were captured and 44 were recaptured between 7 and 1218 days after initial tagging. Curved carapace length varied from 32.9 to 122.5 cm. Mean annual growth rate was 3.03 ± 1.18 cm year−1. The diet of the turtles was mainly composed of red algae of the family Gelidiaceae, Gelidiellaceae and Cystocloniaceae. There was a positive relationship between the abundance of red algae and the number of turtle sightings, with a significant increase in foraging activity during late afternoon. This study highlights the importance of this area as a mixed foraging aggregation of juvenile and adult green turtles, and reveals that foraging grounds for this species in Brazil exhibit southern immature-dominated assemblages and northern mixed aggregations. Areas with high aggregation of green turtles comprising individuals from different life stages must be targeted for conservation management.

scholarly journals Floating rafts as breeding habitats for the Common tern, Sterna hirundo. Colonization patterns, abundance and reproductive success in Venice Lagoon

2018 ◽  
Vol 88 (1) ◽  
pp. 23-32 ◽  
Author(s):  
Francesca Coccon ◽  
Stefano Borella ◽  
Nicola Simeoni ◽  
Stefano Malavasi
Keyword(s):  
Reproductive Success ◽  
Breeding Population ◽  
Venice Lagoon ◽  
Reproductive Period ◽  
Common Tern ◽  
Sterna Hirundo ◽  
Breeding Sites ◽  
Common Terns ◽  
Colonization Patterns ◽  
Floating Rafts

The Venice lagoon hosts the 15% of the entire Italian breeding population of Common terns, Sterna hirundo, highlighting the great value of the area for this species. However, in the last 25 years, a substantial decline of Common terns has been detected in the Lagoon, which culminated in 2008. The main causes of this negative trend were the loss of salt marsh habitats, where terns typically breed in the Venice lagoon. This was due to the increase in the mean sea level and the greater frequency of high tides during the reproductive period with consequent flooding of their breeding sites; competition with yellowlegged gulls (Larus michahellis), predation and human disturbance. As a preliminary experimental approach to counter the depletion of the species and favour its recovery, we performed a habitat loss compensation project by setting up four floating rafts (3x2m), covered by two different types of substrate (sandy and vegetal substrate). This was to function as an artificial nesting site safe from flooding, positioned in a protected internal wetland area of the Venice lagoon, Valle Averto (Sourthern Lagoon). We studied the colonization patterns of the rafts and the reproductive success of Common tern breeding pairs during the 2014 and 2015 breeding seasons. We also investigated those environmental and structural variables that could favour the use of the rafts and the nesting success of the species. In both years, the rafts were successfully colonized and used by terns for nesting. Our results also indicated higher temperature, lower rainfall and greater distance from the shore as the main habitat factors favouring the occurrence and the reproductive success of the breeding pairs, while a windrow of dead plants was indicated as the preferred substrate for covering rafts in order to make them more attractive. The results provided some suggestions for successful restoration plans to be developed in similar lagoon areas.

Feminization in common terns (Sterna hirundo): Relationship to dioxin equivalents and estrogenic compounds

1998 ◽  
Vol 46 (1-5) ◽  
pp. 174-175 ◽  
Author(s):  
C.A. Hart ◽  
M.E. Hahn ◽  
I.C.T. Nisbet ◽  
M.J. Moore ◽  
S.W. Kennedy ◽  
...  
Keyword(s):  
Sterna Hirundo ◽  
Estrogenic Compounds ◽  
Common Terns
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