The system will be going down for regular maintenance. Please save your work and logout.

Recent Submissions

  • Theme Session P: Sex-specific seasonal foraging tactics in adult grey seals (Halichoerus grypus) are revealed by behaviour discriminating state-space models 

    Breed, G. A., I. D. Jonsen, R. A. Myers, W. D. Bowen, et al. 2008. "Theme Session P: Sex-specific seasonal foraging tactics in adult grey seals (Halichoerus grypus) are revealed by behaviour discriminating state-space models." ICES Annual Conference & Meeting, 2008, 22-26 September, Halifax, Canada, Theme Sessions: 1-27.
    Identifying where and how animals forage is key to understanding their ecology and ecosystem role. In many large pelagic animals, observing behaviour is limited almost exclusively to telemetry studies. Discriminating ...
  • Reproductive Consequences of Nest Site Use in Fork-tailed Storm-Petrels in the Aleutian Islands, Alaska: Potential Lasting Effects of an Introduced Predator 

    Drummond, Brie A., and Marty L. Leonard. 2010. "Reproductive Consequences of Nest Site Use in Fork-tailed Storm-Petrels in the Aleutian Islands, Alaska: Potential Lasting Effects of an Introduced Predator." Avian Conservation and Ecology 5(2): 4-4.
    We examined the reproductive consequences of differential nest site use in Fork-tailed Storm-Petrels (Oceanodroma furcata) in the Aleutian Islands, Alaska, where birds on islands where foxes were introduced nest in rocky ...
  • Reproductive consequences of migration decisions by Ipswich Sparrows (Passerculus sandwichensis princeps) 

    Dale, C. A., and M. L. Leonard. 2011. "Reproductive consequences of migration decisions by Ipswich Sparrows (Passerculus sandwichensis princeps)." Canadian Journal of Zoology-Revue Canadienne De Zoologie 89(2): 100-108.
    The costs and benefits associated with migration differ depending on individual decisions regarding the distance to migrate and where to winter. These decisions affect an individual's winter experience, which may in turn ...
  • Long-term feeding ecology of Great Black-backed Gulls (Larus marinus) in the northwest Atlantic: 110 years of feather isotope data 

    Farmer, R. G., and M. L. Leonard. 2011. "Long-term feeding ecology of Great Black-backed Gulls (Larus marinus) in the northwest Atlantic: 110 years of feather isotope data." Canadian Journal of Zoology-Revue Canadienne De Zoologie 89(2): 123-133.
    Recent changes to the ecology of the northwest Atlantic are affecting feeding relationships at many trophic levels. With declining fish stocks and fewer fisheries discards, generalist birds such as Great Black-backed Gulls ...
  • Mate attendance and copulatory behaviour in western bluebirds: Evidence of mate guarding 

    Dickinson, JL, and ML Leonard. 1996. "Mate attendance and copulatory behaviour in western bluebirds: Evidence of mate guarding." Animal Behaviour 52: 981-992.
    The western bluebird, Sialia mexicana, is a socially monogamous passerine with extra-pair offspring in over one-third of nests. Copulatory behaviour and mate attendance were observed for 5 years to determine whether males ...
  • Characteristics of predators and offspring influence nest defense by Arctic and Common Terns 

    Whittam, RM, and ML Leonard. 2000. "Characteristics of predators and offspring influence nest defense by Arctic and Common Terns." Condor 102(2): 301-306.
    Nest defense is a critical aspect of parental care that entails both costs and benefits. The purpose of this study was to examine patterns of nest defense in a colony of Arctic and Common Terns (Sterna paradisaea and S, ...
  • Seasonal and Age-Dependent Dietary Partitioning between the Great Black-Backed and Herring Gulls 

    Steenweg, Rolanda J., Robert A. Ronconi, and Marty L. Leonard. 2011. "Seasonal and Age-Dependent Dietary Partitioning between the Great Black-Backed and Herring Gulls." Condor 113(4): 795-805.
    Studies of seabird diets may reveal subtle ways in which sympatric species partition resources to facilitate co-existence. We studied the variability and partitioning of diets between the Herring (Larus argentatus) and ...
  • Spatiotemporal Patterns in Nest Box Occupancy by Tree Swallows Across North America 

    Shutler, Dave, David J. T. Hussell, D. R. Norris, David W. Winkler, et al. 2012. "Spatiotemporal Patterns in Nest Box Occupancy by Tree Swallows Across North America." Avian Conservation and Ecology 7(1): 3-3.
    Data from the North American Breeding Bird Survey (BBS) suggest that populations of aerial insectivorous birds are declining, particularly in northeastern regions of the continent, and particularly since the mid-1980s. ...
  • Aggressive nest intrusions by male Humboldt Penguins 

    Taylor, Sabrina S., Marty L. Leonard, and Daryl J. Boness. 2001. "Aggressive nest intrusions by male Humboldt Penguins." Condor 103(1): 162-165.
    During observations at a breeding colony of Humboldt Penguins (Spheniscus humboldti), we noted five male penguins enter nests occupied by breeding pairs and engage in aggressive interactions with the resident adult. These ...
  • Mitochondrial DNA variation, species limits, and rapid evolution of plumage coloration and size in the Savannah Sparrow 

    Zink, RM, JD Rising, S. Mockford, AG Horn, et al. 2005. "Mitochondrial DNA variation, species limits, and rapid evolution of plumage coloration and size in the Savannah Sparrow." Condor 107(1): 21-28.
    We compared sequences from two mitochondrial DNA (mtDNA) genes (ND2, ND3) in Savannah Sparrows (Passerculus sandwichensis; n = 112) sampled from Baja California (five sites), coastal Sonora and the continental range (eight ...
  • Predation and breeding success in roseate terns (Sterna dougallii) 

    Whittam, RM, and ML Leonard. 1999. "Predation and breeding success in roseate terns (Sterna dougallii)." Canadian Journal of Zoology-Revue Canadienne De Zoologie 77(6): 851-856.
    Predation limits the breeding success of many colonial seabirds and is a major factor in the decline of a number of marine bird species. The goal of our study was to determine how predation affects the breeding success of ...
  • Presence and abundance of birds in an Atlantic forest reserve and adjacent plantation of shade-grown yerba mate, in Paraguay 

    Cockle, KL, ML Leonard, and AA Bodrati. 2005. "Presence and abundance of birds in an Atlantic forest reserve and adjacent plantation of shade-grown yerba mate, in Paraguay." Biodiversity and Conservation 14(13): 3265-3288.
    In the Atlantic forest region, there is a need to develop economic activities that can be carried out in buffer zones around parks, with minimal impact on forest bird species. One such possibility is the farming of yerba ...
  • Provisioning rules and chick competition in asynchronously hatching common terns (Sterna hirundo) 

    Smith, TE, ML Leonard, and BD Smith. 2005. "Provisioning rules and chick competition in asynchronously hatching common terns (Sterna hirundo)." Behavioral Ecology and Sociobiology 58(5): 456-465.
    Interactions between nestling birds and their parents are models for examining parent-offspring communication and sibling competition. Most studies have focused on species where young are restricted to a nest. However, ...
  • Brood-parasite-induced female-biased mortality affects songbird demography: negative implications for conservation 

    Zanette, Liana Y., Michael Clinchy, Marty L. Leonard, Andrew G. Horn, et al. 2012. "Brood-parasite-induced female-biased mortality affects songbird demography: negative implications for conservation." Oikos 121(9): 1493-1500.
    Parasites, of all sorts, can profoundly affect host population dynamics. Parasites commonly cause sex-biased mortality and this can add to their impact. Female-biased mortality in particular can destabilize dynamics and ...
  • Humboldt penguins Spheniscus humboldti change their foraging behaviour following breeding failure 

    Taylor, Sabrina S., Marty L. Leonard, Daryl J. Boness, and Patricia Majluf. 2004. "Humboldt penguins Spheniscus humboldti change their foraging behaviour following breeding failure." Marine Ornithology 32(1): 63-67.
    At Punta San Juan, Peru, we examined the foraging behaviour of three Humboldt Penguins Spheniscus humboldti following breeding failure, and we compared that behaviour with the behaviour of 22 breeding birds with chicks. ...
  • Foraging by Humboldt penguins (Spheniscus humboldti) during the chick-rearing period: general patterns, sex differences, and recommendations to reduce incidental catches in fishing nets 

    Taylor, SS, ML Leonard, DJ Boness, and P. Majluf. 2002. "Foraging by Humboldt penguins (Spheniscus humboldti) during the chick-rearing period: general patterns, sex differences, and recommendations to reduce incidental catches in fishing nets." Canadian Journal of Zoology-Revue Canadienne De Zoologie 80(4): 700-707.
    We studied the foraging behaviour of endangered Humboldt penguins (Spheniscus humboldti) to examine general foraging patterns, sex differences in foraging behaviour, and the reasons for incidental catches in fishing nets. ...
  • Foraging trip duration increases for Humboldt Penguins tagged with recording devices 

    Taylor, SS, ML Leonard, and DJ Boness. 2001. "Foraging trip duration increases for Humboldt Penguins tagged with recording devices." Journal of Avian Biology 32(4): 369-372.
    Marine animals equipped with data recording devices sometimes show changes in their foraging behaviour, which can indicate an adverse effect of the instrument. We attached time-depth recorders (TDRs) and radio-transmitters ...
  • Breeding between Tree Swallows from the same brood 

    Shutler, D., DJT Hussell, AG Horn, ML Leonard, et al. 2004. "Breeding between Tree Swallows from the same brood." Journal of Field Ornithology 75(4): 353-358.
    We provide data on three instances where Tree Swallows (Tacbycineta bicolor) that fledged from the same nest (broodmates) eventually bred together in subsequent years. Two instances were detected in Ontario and a third was ...
  • The role of development, parental behavior, and nestmate competition in fledging of nestling Tree Swallows 

    Michaud, T., and M. Leonard. 2000. "The role of development, parental behavior, and nestmate competition in fledging of nestling Tree Swallows." Auk 117(4): 996-1002.
    Fledging (i.e. leaving the nest) in altricial birds is a major step toward independence. The timing of this important event may be influenced by nestling development, parental behavior, and sibling interactions. In this ...
  • Calling in the Face of Danger: Predation Risk and Acoustic Communication by Parent Birds and Their Offspring 

    Magrath, Robert D., Tonya M. Haff, Andrew G. Horn, and Marty L. Leonard. 2010. "Calling in the Face of Danger: Predation Risk and Acoustic Communication by Parent Birds and Their Offspring." Advances in the Study of Behavior, Vol 41 41: 187-253.
    No abstract available.

View more