American White Pelican (Pelecanus erythrorhynchos) Growth, Nutrition and Immunology

Abstract

Limited information about nutrition exists on American White Pelicans (Pelecanus erythrorhynchos) from hatching to fledging. To detail immunity, metabolism and nutrition of juvenile American White Pelicans, during 22-23 July 2011, 103 samples of regurgitate matter were collected at five Chase Lake, North Dakota, USA, and three Bitter Lake, South Dakota, USA, sub-colonies. Regurgitate sample nutrient content was significantly different for organic matter (P = 0.012), crude protein (P = 0.001), neutral detergent fiber (P = 0.014), acid detergent fiber (P = 0.005) and energy (P = 0.034) between North (n = 5) and South (n = 3) Dakota American White Pelican colonies. Average concentrations of immunoglobulins Y (2.74 ± 1.85 ng/mL) and A (9.04 ± 9.41 ng/mL) demonstrated passive transfer of immunity in regurgitate. To enhance information on growth and morphology in hand-reared American White Pelicans (n = 8), a 9-week captive trial was also conducted raising chicks from hatching to fledging. Predictive models were created to describe chick growth for intake, body weight, culmen length and tarsus length. Data collected during this study enhances both American White Pelican general ecology and conservation with implications for both captive and wild bird management.

Temporal coherence patterns of prairie pothole wetlands indicate the importance of landscape linkages and wetland heterogeneity in maintaining biodiversity

“…Because prairiepothole wetlands are the dominant water bodies found in the Prairie Pothole Region, they are critical habitats for aquatic fauna, primarily invertebrates and amphibians. The plants, invertebrates, and amphibians found within prairiepothole wetlands provide critical forage for migrating and nesting waterbirds (Deutschman and Peterka, 1988;Krapu and Reinecke, 1992;Stafford et al, 2016;Ferguson et al, 2019). Protection and restoration of prairie-pothole wetlands has been largely driven by waterbird conservation efforts, specifically ducks (Doherty et al, 2013;Dixon et al, 2019).…”