Metal and metalloid levels in blood of semipalmated sandpipers (Calidris pusilla) from Brazil, Suriname, and Delaware Bay: Sentinels of exposure to themselves, their prey, and predators that eat them

2019 ◽  
Vol 173 ◽  
pp. 77-86 ◽  
Author(s):  
Joanna Burger ◽  
David Mizrahi ◽  
Christian Jeitner ◽  
Nellie Tsipoura ◽  
Jason Mobley ◽  
...  
Keyword(s):  
Delaware Bay ◽  
Calidris Pusilla ◽  
Semipalmated Sandpipers

Metals in tissues of migrant semipalmated sandpipers (Calidris pusilla) from Delaware Bay, New Jersey

2014 ◽  
Vol 133 ◽  
pp. 362-370 ◽  
Author(s):  
Joanna Burger ◽  
Michael Gochfeld ◽  
Lawrence Niles ◽  
Amanda Dey ◽  
Christian Jeitner ◽  
...  
Keyword(s):  
New Jersey ◽  
Delaware Bay ◽  
Calidris Pusilla ◽  
Semipalmated Sandpipers

Effect of forager density on feeding rates in spring-staging Semipalmated Sandpipers (Calidris pusilla) using different foraging modes

2018 ◽  
Vol 96 (9) ◽  
pp. 996-1001 ◽  
Author(s):  
Ivana Novcic ◽  
Guy Beauchamp
Keyword(s):  
Delaware Bay ◽  
Nearest Neighbour ◽  
Feeding Rates ◽  
Stopover Site ◽  
Neighbour Distance ◽  
Short Intervals ◽  
Foraging Modes ◽  
Calidris Pusilla ◽  
Spring Stopover ◽  
Semipalmated Sandpipers

We examined the influence of the density of foragers on feeding rates of Semipalmated Sandpipers (Calidris pusilla (Linnaeus, 1766)) while using different foraging modes at a spring stopover site in Delaware Bay, USA. Using dynamic estimates of interindividual distances obtained at short intervals of time, we explored how forager density affected feeding rates when Semipalmated Sandpipers used visual pecking or tactile probing. Pecking rate significantly increased with interindividual distances, whereas probe rate was not affected by density. Our study also showed that in fast-moving foragers, such as Semipalmated Sandpipers, in which the number of nearby foragers and distance to the nearest neighbour continuously change throughout the foraging bout, pecking rates are more affected by nearest neighbour distance than by the number of foragers in their immediate vicinity. In addition, our study implies that foragers using different foraging modes might be differently affected by nearby competitors perhaps in response to prey disturbance by neighbours.

scholarly journals Local Annual Survival and Seasonal Residency Rates of Semipalmated Sandpipers (Calidris Pusilla) in Puerto Rico

The Auk ◽  
2007 ◽  
Vol 124 (4) ◽  
pp. 1397-1406 ◽  
Author(s):  
Susan M. Rice ◽  
Jaime A. Collazo ◽  
Mathew W. Alldredge ◽  
Brian A. Harrington ◽  
Allen R. Lewis
Keyword(s):  
Puerto Rico ◽  
Length Of Stay ◽  
Differential Mortality ◽  
Caribbean Region ◽  
Greater Antilles ◽  
Annual Survival ◽  
Salt Flats ◽  
The Caribbean ◽  
Calidris Pusilla ◽  
Semipalmated Sandpipers

Abstract We report seasonal residency and local annual survival rates of migratory Semipalmated Sandpipers (Calidris pusilla) at the Cabo Rojo salt flats, Puerto Rico. Residency rate (daily probability of remaining on the flats) was 0.991 ± 0.001 (x̄ ± SE), yielding a mean length of stay of 110 days. This finding supports the inclusion of the Caribbean as part of the species' winter range. Average estimated percentage of fat was low but increased throughout the season, which suggests that birds replenish some spent fat reserves and strive for energetic maintenance. Local annual survival rate was 0.62 ± 0.04, within the range of values reported for breeding populations at Manitoba and Alaska (0.53–0.76). The similarity was not unexpected because estimates were obtained annually but at opposite sites of their annual migratory movements. Birds captured at the salt flats appeared to be a mix of birds from various parts of the breeding range, judging from morphology (culmen's coefficient of variation = 9.1, n = 106). This suggested that origin (breeding area) of birds and their proportion in the data should be ascertained and accounted for in analyses to glean the full conservation implications of winter-based annual survival estimates. Those data are needed to unravel the possibility that individuals of distinct populations are affected by differential mortality factors across different migratory routes. Mean length of stay strongly suggested that habitat quality at the salt flats was high. Rainfall and tidal flow combine to increase food availability during fall. The salt flats dry up gradually toward late January, at the onset of the dry season. Semipalmated Sandpipers may move west to other Greater Antilles or south to sites such as coastal Surinam until the onset of spring migration. They are not an oversummering species at the salt flats. Conservation efforts in the Caribbean region require understanding the dynamics of this species throughout winter to protect essential habitat. Tasas de Supervivencia Anual Local y de Residencia Estacional de Calidris pusilla en Puerto Rico

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.

Local survival in Semipalmated Sandpipers Calidris pusilla breeding at La Pérouse Bay, Canada

Ibis ◽  
2008 ◽  
Vol 139 (2) ◽  
pp. 305-312 ◽  
Author(s):  
BRETT K. SANDERCOCK ◽  
CHERI L. GRATTO-TREVOR
Keyword(s):  
Local Survival ◽  
Calidris Pusilla ◽  
Semipalmated Sandpipers

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.

Activité alimentaire nocturne des Bécasseaux semipalmés (Calidris pusilla) lors d'une halte migratoire dans la baie de Fundy

1991 ◽  
Vol 69 (2) ◽  
pp. 380-384 ◽  
Author(s):  
Micheline Manseau ◽  
Jean Ferron
Keyword(s):  
Feeding Activity ◽  
Exposure Period ◽  
Calidris Pusilla ◽  
Migratory Stopover ◽  
Semipalmated Sandpipers

During their migratory stopover at Mary's Point, Semipalmated Sandpipers fed during both daytime and nightime low tides. However, at night, the sandpipers tended to be less numerous, did not feed as intensively, and were encountered only for part of the mudflat exposure period. Moreover, their feeding activity was comparable between diurnal periods, but varied greatly from one night to another independently of moonlight.

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