Sélection des proies par quatre espèces d'oiseaux limicoles (Charadrii) de passage dans l'estuaire du Saint-Laurent lors de la migration vers le sud

1990 ◽  
Vol 68 (6) ◽  
pp. 1154-1162 ◽  
Author(s):  
Guy Michaud ◽  
J. Ferron
Keyword(s):  
Benthic Invertebrates ◽  
Intertidal Mudflat ◽  
Simultaneous Presence ◽  
Invertebrate Fauna ◽  
Nereis Virens ◽  
Semipalmated Sandpiper ◽  
Feeding Area ◽  
Calidris Pusilla ◽  
Charadrius Semipalmatus ◽  
Southward Migration

The diet of four shorebird species, the Black-bellied Plover (Pluvialis squatarola), Semipalmated Plover (Charadrius semipalmatus), Lesser Yellowlegs (Tringa flavipes), and Semipalmated Sandpiper (Calidris pusilla), was studied on an intertidal mudflat during their southward migration. Mollusks dominate the invertebrate fauna in the feeding area, representing 95% of the organisms in terms of number and biomass. The predatory shorebirds appeared to forage selectively on polychaetes and crustaceans, which represent only 5% of the benthic invertebrates in the feeding area. Lesser Yellowlegs eat nearly exclusively crustaceans. The other three predators feed mainly on Nereis virens and all three select groups of worms that differ significantly by their size, the larger predators consuming the biggest prey. Despite the simultaneous presence of the four predators on the feeding area, they seem to share the resources without overt interspecific competition.

Staging ecology of Semipalmated Plover (Charadrius semipalmatus) and Semipalmated Sandpiper (Calidris pusilla) juveniles in the St. Lawrence River Estuary during fall migration

2013 ◽  
Vol 91 (11) ◽  
pp. 802-809 ◽  
Author(s):  
Yves Turcotte ◽  
Jean-François Lamarre ◽  
Joël Bêty
Keyword(s):  
Length Of Stay ◽  
Body Mass ◽  
Atlantic Coast ◽  
River Estuary ◽  
Fat Free Mass ◽  
The North ◽  
Semipalmated Sandpiper ◽  
Calidris Pusilla ◽  
Charadrius Semipalmatus ◽  
St Lawrence River

The acquisition of body reserves by migrating shorebirds at specific staging sites is critical for reaching their breeding or wintering grounds. As many North American shorebird populations are declining, major staging sites need to be identified for effective conservation plans. Changes in body mass of Semipalmated Plover (Charadrius semipalmatus Bonaparte, 1825) and Semipalmated Sandpiper (Calidris pusilla (L., 1766)) juveniles, as well as length of stay and daily movements by Semipalmated Plover juveniles during fall migration, were studied in the St. Lawrence River Estuary in southern Quebec, Canada. Most juveniles of both species captured early in the migration period weighed less than the estimated mean fat-free mass. Body mass increased steadily in juveniles of both species during staging. Mean body masses of birds captured in our study area were similar to or higher than those of juveniles of both species captured along the North Atlantic coast. Length of stay of radio-tracked Semipalmated Plover juveniles ranged from 2 to 28 days. Body mass at capture and length of stay were negatively associated, suggesting that individuals refuelled before resuming their migration. Overall, these results provide evidence that the St. Lawrence River Estuary is an important staging site for Semipalmated Plover and Semipalmated Sandpiper juveniles.

Semipalmated Sandpiper (Calidris pusilla)

2020 ◽  
Author(s):  
Peter Hicklin ◽  
Cheri L. Gratto-Trevor
Keyword(s):  
Semipalmated Sandpiper ◽  
Calidris Pusilla

Breeding Cycle and Behavior of the Semipalmated Sandpiper at Barrow, Alaska

The Auk ◽  
1979 ◽  
Vol 96 (1) ◽  
pp. 56-67 ◽  
Author(s):  
Shoshana Ashkenazie ◽  
Uriel N. Safriel
Keyword(s):  
Home Range ◽  
Pair Formation ◽  
Egg Laying ◽  
Breeding Cycle ◽  
Male And Female ◽  
Semipalmated Sandpiper ◽  
The Family ◽  
Polygonal Area ◽  
Calidris Pusilla ◽  
And Behavior

Abstract Pair formation of Calidris pusilla near Barrow, Alaska occurs 3-6 days after the territory is established. The pair is then engaged in nest scraping displays during 2-3 days, in which 10-12 scrapes are made by the male and examined by the female. Eventually 2-3 scrapes are lined by the female, and in one of these the first egg is laid 4-6 days after pairing. During the egg-laying period further lining is performed by the female and partial incubation takes place by both sexes. Continuous incubation commences 8 h prior to laying of the 4th egg. Male and female alternate in incubation: in the first 2 days a turn lasts 3-5 h, and the duration gradually increases up to 13-14 h during the 2nd week. Long incubation turns reduce the number of approaches to the nest and may therefore reduce the chances of it being discovered by predators. The incubating bird is intermittently engaged in egg-rolling and in camouflaging the nest by bending adjacent grass blades over its back, and is constantly alert. The off-duty bird may feed 2-3 km away from the nest. The eggs hatch after 20 days of incubation, all within 1 day. Females desert the family 2-8 days after hatching: they desert late if hatching is early, and early if hatching is late in the season. After female departure the family moves from the nesting territory, typically in a high-centered polygonal area, to establish a home range as far as 2-3 km away, often in a low-centered polygonal area. During the first 6-8 days after hatching, the male prepares each evening a scrape for night brooding. After fledging, the male and young join wandering flocks.

Crawling behaviour of the amphipod Corophium volutator and foraging by Semipalmated Sandpipers, Calidris pusilla

1989 ◽  
Vol 67 (2) ◽  
pp. 457-462 ◽  
Author(s):  
J. Sherman Boates ◽  
Peter C. Smith
Keyword(s):  
Nova Scotia ◽  
Food Intake ◽  
Lunar Cycle ◽  
Intertidal Mudflat ◽  
Sharp Reduction ◽  
Corophium Volutator ◽  
Quantitative Evidence ◽  
Qualitative And Quantitative ◽  
Calidris Pusilla ◽  
Semipalmated Sandpipers

During late spring and summer, the crawling behaviour of the amphipod Corophium volutator was studied on an intertidal mudflat in the Minas Basin, Nova Scotia. On average, less than 1% of the population crawled on any tide and these individuals tended to be large adults that were predominantly males. Animals emerged as the tide receded but most had crawled into burrows after 25 min. The crawling behaviour did not seem to be related to the lunar cycle as was expected; however, there was a sharp reduction in crawling activity (from 36.3 to 1.2 amphipods/m2) in July that coincided with the arrival of Semipalmated Sandpipers, Calidris pusilla, an abundant seasonal predator. The proportion of males in the amphipod population declined during the period when sandpipers were present. It appears that both a change in amphipod behaviour and depletion of the animals most prone to crawling may contribute to the observed reduction in crawling activity. Qualitative and quantitative evidence show that sandpipers were attracted to the tide edge where crawling amphipods were relatively abundant and that they increased their food intake by doing so.

Réponses comportementales des polychètes Nereis diversicolor (O.F. Müller) et Nereis virens (Sars) aux stimuli d'ordre alimentaire : utilisation de la matière organique particulaire (algues et halophytes)

1995 ◽  
Vol 73 (12) ◽  
pp. 2307-2317 ◽  
Author(s):  
Marc Olivier ◽  
Gaston Desrosiers ◽  
Alain Caron ◽  
Christian Retière ◽  
Aline Caillou
Keyword(s):  
Potential Role ◽  
Time Budget ◽  
Sediment Surface ◽  
Lawrence Estuary ◽  
Nereis Diversicolor ◽  
Nereis Virens ◽  
Intertidal Ecosystem ◽  
Feeding Area ◽  
St Lawrence Estuary

Plant preference and feeding selectivity were studied in juveniles of Nereis diversicolor O.F. Müller) and Nereis virens (Sars) (Polychaeta: Nereidae) to evaluate the potential role of these species in the integration and transfer of vegetal debris to the littoral ecosystem. Results show that these annelids ingest the main plant species (algae and halophytes) that are abundant in the marshes of the bay of Mont-Saint-Michel (France) and (or) the À l'Orignal Inlet (St. Lawrence Estuary, Canada), independently of their origin or level of decomposition. Juveniles select detritus on the sediment surface (feeding area) and accumulate them in their burrow. Constant irrigation by young individuals (≈35% of time budget) maintains aerobic conditions favouring the decay process of plant debris by stimulating bacterial growth (gardening). Our results suggest that individuals of both N. diversicolor and N. virens play an important role in the transfer and integration processes and the residence time of vegetal detritus of the intertidal ecosystem.

scholarly journals O uso de praias arenosas com diferentes concentrações humanas por espécies de aves limícolas (Charadriidae e Scolopacidae) neárticas no sudeste do Brasil

2008 ◽  
Vol 8 (4) ◽  
pp. 83-88 ◽  
Author(s):  
César Cestari
Keyword(s):  
Calidris Canutus ◽  
Calidris Pusilla ◽  
Charadrius Semipalmatus

As aves migratórias podem reconhecer humanos e animais domésticos como possíveis predadores, alterando seus padrões de abundância e comportamento de formação de bandos. O objetivo do presente estudo foi comparar a abundância de aves migratórias neárticas, a freqüência de bandos e o número médio de aves por bando em áreas com alta e baixa concentração humana em uma região costeira de praia arenosa no sudeste do Brasil. As aves, pessoas e cães foram contados mensalmente entre novembro de 2006 a abril de 2007. Foram registradas seis espécies de aves (Arenaria interpres, Calidris alba, Calidris canutus, Calidris pusilla, Charadrius semipalmatus, Pluvialis dominica) nas duas áreas, no entanto somente C. canutus foi registrado exclusivamente na área com baixa concentração humana. Houve diferença significativa no número médio de pessoas e cães entre as áreas, mas não no número médio de aves. Não houve correlação entre o número de humanos e aves, e entre cães e aves. Adicionalmente, não houve diferença significativa na freqüência de bandos e número de indivíduos por bando entre as áreas. Os resultados deste estudo destacaram a sensibilidade de C. canutus na área com alta concentração humana e a necessidade de futuras investigações que determinem os limites máximos de concentração de pessoas e cães domésticos que as aves migratórias neárticas podem tolerar para a tomada de ações de proteção em áreas costeiras com ocupação humana.

scholarly journals Body mass and acquisition of breeding plumage of wintering Calidris pusilla (Linnaeus) (Aves, Scolopacidae) in the coast of Pernambuco, north-eastern Brazil

2004 ◽  
Vol 21 (2) ◽  
pp. 249-252 ◽  
Author(s):  
Carmem E. Fedrizzi ◽  
Severino M. de Azevedo Júnior ◽  
Maria E. Lacerda de Larrazábal
Keyword(s):  
Body Mass ◽  
Boreal Summer ◽  
Semipalmated Sandpiper ◽  
Eastern Brazil ◽  
North Eastern ◽  
Breeding Grounds ◽  
Calidris Pusilla ◽  
Breeding Plumage ◽  
The Relationship ◽  
Semipalmated Sandpipers

Annually, large flocks of semipalmated sandpiper Calidris pusilla (Linnaeus, 1766) winter along South America coast, between September-April. They store fats in order to moult and return to their breeding grounds. Here, was examined body masses and plumage of adults Semipalmated Sandpipers during the departure month to evaluate the relationship between body mass and plumage. Fieldwork was conducted at Coroa do Avião (7º40'S, 34º50'W), Pernambuco. Birds were trapped in mist-nets between April 1990 and 1997. They were weighed, and aged according to plumage. Adult plumage may be (1) non-breeding, (2) pre-breeding, and (3) breeding. A total of 213 birds were weighed and examined, so that 8.0% (17) presented non-breeding plumage, 54.0% (115) pre-breeding, and 38.0% (81) breeding plumage. As in Semipalmated Sandpiper, 25g is the minimum body mass required to migrate, birds with breeding plumage and most with pre-breeding, were potentially apt to migrate. Non-breeding plumage birds presented smaller body mass. Apparently physiological problems and infestation may be important factors to explain over-summering, i.e., individuals remaining in the wintering grounds during the boreal summer.

scholarly journals Abundância sazonal de aves migratórias na Área de Proteção Ambiental de Piaçabuçu, Alagoas, Brasil

2006 ◽  
Vol 23 (3) ◽  
pp. 865-869 ◽  
Author(s):  
Susanna A. S. Cabral ◽  
Severino M. de Azevedo Júnior ◽  
Maria Eduarda de Larrazábal
Keyword(s):  
Calidris Pusilla ◽  
Charadrius Wilsonia ◽  
Charadrius Semipalmatus

Todos os anos milhares de aves limícolas e migratórias invernam ao longo da costa da América do Sul, entre setembro e abril, onde adquirem massa corpórea e realizam mudas para retornar aos sítios de reprodução. Estudos quali-quantitativos foram realizados na Área de Proteção Ambiental de Piaçabuçu, Alagoas, Brasil, através da contagem direta, objetivando o acompanhamento das flutuações sazonais da avifauna migrante. Foram registradas cinco espécies da família Charadriidae: Vanellus chilensis (Wagler, 1827); Pluvialis squatarola (Linnaeus, 1758); Charadrius semipalmatus Bonaparte, 1825; Charadrius collaris Vieillot, 1818 e Charadrius wilsonia (Ord, 1814) e cinco espécies da família Scolopacidae: Arenaria interpres (Linnaeus, 1758); Actitis macularius (Linnaeus, 1766); Catoptrophorus semipalmatus (Gmelin, 1789); Calidris pusilla (Linnaeus, 1766) e Calidris alba (Pallas, 1764). Pluvialis squatarola, Charadrius semipalmatus, Charadrius collaris, Arenaria interpres, Calidris pusilla e Calidris alba foram consideradas constantes (presentes em mais de 50% das observações). Charadrius semipalmatus e Calidris alba apresentaram os maiores índices de freqüência de ocorrência nos meses de novembro e dezembro e, março e setembro, respectivamente. A correlação de Spearman demonstra uma forte dependência na migração destas espécies. A fidelidade dessas aves a APA de Piaçabuçu observada nessa pesquisa indica ser a área um sítio de invernada, reforçando sua importância para a conservação das espécies migratórias que utilizam o local.

scholarly journals The middle Danian Faxe Formation – new lithostratigraphic unit and a rare taphonomic window into the Danian of Denmark

2012 ◽  
Vol 60 ◽  
pp. 47-60
Author(s):  
Bodil Wesenberg Lauridsen ◽  
Finn Surlyk ◽  
Morten Bjerager
Keyword(s):  
Benthic Invertebrates ◽  
Cold Water ◽  
Complete Picture ◽  
Burial Diagenesis ◽  
Special Significance ◽  
Invertebrate Fauna ◽  
Lithostratigraphic Unit ◽  
Invertebrate Fossils ◽  
High Diversity ◽  
Water Coral

The new middle Danian Faxe Formation is defined on the basis of the succession exposed in the large Faxe quarry in eastern Denmark. The formation is defined as a distinct mappable ithostratigraphic unit of interfingering coral and bryozoan limestone passing laterally into bryozoan limestones of the Stevns Klint Formation. The Baunekule facies is recognized in the upper part of the coral mound complex of the Faxe Formation, where it forms isolated lensoidal bodies in the flanks of some of the coral mounds. It is characterised by a high diversity invertebrate fauna with both calcite and originally aragonite-shelled benthic invertebrates set in weakly consolidated coral-dominated floatstone to rudstone. The diagenesis of the Baunekule facies is of special significance because a high proportion of the originally aragonite-shelled fauna is preserved by recrystallization to calcite during early burial diagenesis. More than 80% of the species from the Baunekule facies are unknown from other parts of the Faxe Formation. The carbonate mud matrix is only slightly consolidated and the invertebrate fossils are accordingly easy to prepare in contrast to the fossils from the lithified parts of the Faxe Formation, which are commonly only preserved as moulds or casts. The facies therefore presents an exceptional taphonomic window into a cold-water coral mound fauna, giving an unusually complete picture of the diversity and density of the shelly invertebrate fauna.

Sign in / Sign up

Export Citation Format

Share Document