Comparative Feeding Ecology of Steller's Eider and Long-Tailed Ducks in Winter

Bustnes, Jan Ove; Systad, Geir Helge

doi:10.2307/1522072

Cited by 20 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Dominant prey of Long-tailed Ducks varies in different parts of the wintering range: gastropods are the predominant food item along the coasts of New Hampshire (Stott and Olson 1973) and northern Norway (Bustnes and Systad 2001); crustaceans are the most important prey for birds wintering at Lake Michigan (Peterson and Ellarson 1977), coastal British Columbia (Vermeer and Levings 1977), and Hudson Bay (Jamieson et al 2001); and bivalves dominate their diet in the Baltic Sea (Madsen 1954, Nilsson 1972, Stempniewicz 1995, Kube 1996. Many authors agree that Long-tailed Ducks are opportunistic feeders, foraging on the most abundant and available prey (Peterson and Ellarson 1977, Goudie and Ankney 1986, Bustnes and Systad 2001.…”

Section: Discussionmentioning

confidence: 99%

“…Many authors agree that Long-tailed Ducks are opportunistic feeders, foraging on the most abundant and available prey (Peterson and Ellarson 1977, Goudie and Ankney 1986, Bustnes and Systad 2001. However, Jamieson et al (2001) reported selective foraging by Long-tailed Ducks in polynyas (areas of open water in sea ice) of Hudson Bay, where birds fed almost exclusively on crustaceans, even though M. edulis were present.…”

Section: Discussionmentioning

confidence: 99%

“…Wintering Long-tailed Ducks inhabit a variety of coastal habitats and shallow offshore banks (Durinck et al 1994). Diet composition varies widely throughout their Holarctic range (Madsen 1954, Peterson and Ellarson 1977, Vermeer and Levings 1977, Goudie and Ankney 1986, Stempniewicz 1995, Bustnes and Systad 2001, Jamieson et al 2001. However, few attempts have been made to relate feeding habits of Long-tailed Ducks to attributes of their local environment (Nilsson 1972, Stott and Olson 1973, Kube 1996.…”

mentioning

confidence: 99%

“…However, few attempts have been made to relate feeding habits of Long-tailed Ducks to attributes of their local environment (Nilsson 1972, Stott and Olson 1973, Kube 1996. Long-tailed Ducks are recognized as opportunistic feeders (Peterson and Ellarson 1977, Goudie and Ankney 1986, Bustnes and Systad 2001, but ecological factors related to use of different habitats have received little study. We investigated food choice of Longtailed Ducks wintering in two distinct marine habitats in nearshore waters of the Baltic Sea off the coast of Lithuania.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Winter Foraging of Long-Tailed Ducks (Clangula Hyemalis) Exploiting Different Benthic Communities in the Baltic Sea

Žydelis¹,

Ruškytė²

2005

The Wilson Bulletin

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Winter Foraging of Long-Tailed Ducks (Clangula Hyemalis) Exploiting Different Benthic Communities in the Baltic Sea

Žydelis¹,

Ruškytė²

2005

The Wilson Bulletin

View full text Add to dashboard Cite

“…Long-tailed ducks have been observed to spend ~80 % of the daylight hours during winter foraging [38,42]. These ducks forage predominantly on motile prey (e.g., crustaceans and fish [43,44]), which might require sufficient light conditions for successful capture and prevent night foraging. Foraging activity in longtailed ducks was also shown to change with temperature, so that foraging time was greatest during the coldest months [38,42].…”

Section: Relevance To Sea Ducks Wintering At High Latitudementioning

confidence: 99%

Two methods of radio transmitter attachment and their effects on the behavior and energetics of captive long-tailed ducks (Clangula hyemalis) during winter

et al. 2015

View full text Add to dashboard Cite

Background: Attachment of external devices can have negative consequences for the health and fitness of subjects, but these effects are often overlooked. In preparation for a field study with small sea ducks, we investigated the effects of two types of external radio transmitter attachments on activity budgets and energetics of captive longtailed ducks (Clangula hyemalis) during winter. Methods:We conducted behavioral observations on 15 ducks over 3 months and measured oxygen consumption rates while resting on water and during preening. Ducks were either sham handled ('Control') or had transmitters attached with subcutaneous anchors ('Prongs') or Tesa tape/sutures ('Tesa'). Results:Following transmitter attachment, the activity budgets of Prong and Tesa birds changed significantly, while Controls remained largely unchanged. Prong and Tesa birds reduced locomotor activity (−58 and −54 %, respectively) and the proportion of time spent in water (−48 and −35 %, respectively), while they concomitantly increased time allocated to maintenance behavior (+98 and +151 %, respectively). Tesa birds recovered from these changes over time, at least partially, but Prong birds did not. Also, two of the five Prong birds developed a bacterial infection that spread from the attachment site. Retention time of transmitters was significantly greater for the Prong attachments (4 of 5 tags were retained for the entire 59-day study) than the Tesa technique (26.0 ± 3.2 days). Energy metabolism of ducks resting on water did not change significantly after transmitter attachment. Preening, the primary maintenance behavior, increased oxygen consumption rates by ~70 % over resting. The greater allocation of time to maintenance behavior after transmitter attachment most likely increased daily energy expenditure in these ducks, although the concurrent reduction in locomotor activity might have mitigated this effect. Ducks in our study had food ad libitum and were able to reduce locomotion after transmitter attachment without compromising food intake and, hence, energy balance. In the wild, this strategy might not be viable. Conclusions: Given the short retention time, the tape-based attachment technique we applied is not suitable if monitoring periods greater than ~2 to 3 weeks are desired. Both methods resulted in significant behavioral changes with energetic consequences that should be considered when planning to attach external transmitters to small sea ducks in the wild.

show abstract

Spatially explicit network analysis reveals multi‐species annual cycle movement patterns of sea ducks

Lamb

Paton

Osenkowski

et al. 2019

Ecological Applications

View full text Add to dashboard Cite

Conservation of long‐distance migratory species poses unique challenges. Migratory connectivity, that is, the extent to which groupings of individuals at breeding sites are maintained in wintering areas, is frequently used to evaluate population structure and assess use of key habitat areas. However, for species with complex or variable annual cycle movements, this traditional bimodal framework of migratory connectivity may be overly simplistic. Like many other waterfowl, sea ducks often travel to specific pre‐ and post‐breeding sites outside their nesting and wintering areas to prepare for migration by feeding extensively and, in some cases, molting their flight feathers. These additional migrations may play a key role in population structure, but are not included in traditional models of migratory connectivity. Network analysis, which applies graph theory to assess linkages between discrete locations or entities, offers a powerful tool for quantitatively assessing the contributions of different sites used throughout the annual cycle to complex spatial networks. We collected satellite telemetry data on annual cycle movements of 672 individual sea ducks of five species from throughout eastern North America and the Great Lakes. From these data, we constructed a multi‐species network model of migratory patterns and site use over the course of breeding, molting, wintering, and migratory staging. Our results highlight inter‐ and intra‐specific differences in the patterns and complexity of annual cycle movement patterns, including the central importance of staging and molting sites in James Bay, the St. Lawrence River, and southern New England to multi‐species annual cycle habitat linkages, and highlight the value of Long‐tailed Ducks (Calengula haemalis) as an umbrella species to represent the movement patterns of multiple sea duck species. We also discuss potential applications of network migration models to conservation prioritization, identification of population units, and integrating different data streams.

show abstract

Comparative Feeding Ecology of Steller's Eider and Long-Tailed Ducks in Winter

Cited by 20 publications

References 15 publications

Winter Foraging of Long-Tailed Ducks (Clangula Hyemalis) Exploiting Different Benthic Communities in the Baltic Sea

Winter Foraging of Long-Tailed Ducks (Clangula Hyemalis) Exploiting Different Benthic Communities in the Baltic Sea

Two methods of radio transmitter attachment and their effects on the behavior and energetics of captive long-tailed ducks (Clangula hyemalis) during winter

Spatially explicit network analysis reveals multi‐species annual cycle movement patterns of sea ducks

Contact Info

Product

Resources

About