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Cheryl Baduini

Adjunct Associate Professor of Biology, Pitzer in Costa Rica Program
Associate Professor of Biology

Email: cbaduini@kecksci.claremont.edu
Office Hours: (Pitzer in Costa Rica Program)
Web Site: https://faculty.jsd.claremont.edu/cbaduini 

Educational Background

B.S., University of Miami
M.S., Moss Landing Marine Labs, SJSU
Ph.D., University of California, Irvine

Courses Taught

  • Marine Ecology
  • Living Sea
  • Introductory Biology
  • Applied Biostatistics
  • Molecular Ecology

Research Interests

Ecology and Population Genetics of Seabirds

Selected Publications List

  1. Baduini, C.L. and Hyrenbach, K.D. (2003). Biogeography of Procellariiform foraging strategies: does ocean productivity influence provisioning?. Marine Ornithology   31: 101-112. Article
  2. Hunt, G.L., Jr., C.L. Baduini, and J. Jahncke. (2002). Diets of Short-tailed shearwaters in the Southeastern Bering Sea. Deep Sea Research II  49(26): 6147-6156.
    Abstract:  In the late 1990s, the southeastern Bering Sea exhibited a number of anomalous conditions, including a major die-off of short-tailed shearwaters (Puffinus tenuirostris), a trans-equatorial migrant that constitutes a major portion of the marine bird biomass in the southeastern Bering Sea. As part of a larger study of the ecological role of the inner or structural front over the southeastern Bering Sea shelf, in 1997–1999, we collected short-tailed shearwaters to determine diet composition. In spring 1997, we found that short-tailed shearwaters were consuming predominately the euphausiid Thysanoessa raschii, a diet expected on the basis of past studies. However, in subsequent years, short-tailed shearwater diets in spring contained increasingly larger proportions of fish, in particular, sandlance (Ammodytes hexapterus), as well as other species of euphausiids (T. inermis in 1999). In summer and fall collections, short-tailed shearwater diets were more varied than in spring, and included both fish (age-0 gadids, 21–35% by weight) and a wider variety of euphausiid species (T. inermis and T. spinifera). In summer and fall, crab zoea (August 1998) and copepods (August 1999) were eaten by shearwaters collected while feeding within the inner front. Diets in 1997–1999 were broader than those found in previous studies of short-tailed shearwaters over the inner shelf and Bristol Bay, which had documented diets composed almost solely of T. raschii. Our data are consistent with the hypothesis that euphausiids were less available to short-tailed shearwaters foraging over the middle and coastal domains of the southeastern Bering Sea in 1997–1999 than has previously been true. Our results are also consistent with hypothesis that the inner front can affect the availability of prey to shearwaters.
  3. Baduini, C.L . (2002). Parental provisioning patterns of Wedge-tailed Shearwaters and their relation to chick body condition. The Condor 104: 823-831.
  4. Lovvorn, J.R., C.L. Baduini, and G.L. Hunt, J . (2001). Modeling underwater visual and filter-feeding by planktivorous shearwaters in unusual sea conditions. Ecology 82(8): 2342-2356.
  5. Baduini, C.L., K.D. Hyrenbach, K.O. Coyle, A. Pinchuk, V. Mendenhall, and G.L. Hunt. (2001). Mass mortality of short-tailed shearwaters in the southeastern Bering Sea during summer 1997. Fisheries Oceanography   10(1): 117-130.
    Abstract: During summer 1997, hundreds of thousands of emaciated short-tailed shearwaters (Puffinus tenuirostris) died in the south-eastern Bering Sea. Using strip transect methodology, we documented the distribution and abundance of short-tailed shearwaters during cruises conducted prior to, during, and after the die-off, as well as the distributions and abundances of floating carcasses. The distributions and abundances of short-tailed shearwaters in 1997 were similar to those found during the 1970s and early 1980s. In August-September 1997, we observed 163 floating shearwater carcasses, most of which were between St Paul Island and Nunivak Island. We estimated 190 000 carcasses were afloat in the study area, about 11% of the surveyed population. Between spring (June) and autumn (August/September), mean net body mass of shearwaters decreased by 19%, mean pectoral muscle mass decreased by 14%, and mean percentage body lipid content decreased by 46%, from 15.6% in spring to 8.4% in autumn. Compared with spring, short-tailed shearwater diets broadened in autumn 1997, to include, in addition to adult euphausiids Thysanoessa raschii, juveniles of T. inermis, T. raschii and T. spinifera, crab megalops, fish and squid. We discuss how the ecosystem anomalies in the south-eastern Bering Sea during spring and summer 1997 relate to the mortality event and suggest possible implications of long-term climate change for populations of apex predators in the south-eastern Bering Sea.
    Article: URL not found
  6. Baduini, C.L., J.R. Lovvorn, and G.L. Hunt, Jr. (2001). Determining the nutritional condition of short-tailed shearwaters (Puffinus tenuirostris): implications for migratory flight ranges and starvation events. Mar. Ecol. Prog. Ser.  222: 265-277.
    Abstract: Short-tailed shearwaters Puffinus tenuirostris migrate annually from breeding areas in southeast Australia and Tasmania to the Bering Sea to feed on abundant prey aggregations, mainly euphausiids. Occasionally thousands of shearwaters die of starvation en route, within, or on return from the Bering Sea. Collection of live and dead shearwaters in the southeastern Bering Sea in 1997, 1998, and 1999 allowed us to measure seasonal changes in energy reserves during a major mortality event. As birds lost body mass, lipid mass initially decreased faster than that of pectoralis muscle, but loss of pectoralis mass increased markedly at a body mass around 500 g when lipids were almost depleted (~33 g remaining). Death occurred as body mass approached 426 g. Individuals near this body mass had lipid values permitting estimated flight ranges of 140 to 400 km, a range less than that potentially covered in 1 d by shearwaters searching for prey (440 to 1124 km d-1). Seasonal differences in body composition were most striking among body and bone marrow lipid contents, with the lowest values occurring during the die-off in fall 1997 and in fall 1998. The lack of shearwater mortality in fall 1998 may have resulted from more consistent winds that decreased flight costs and from greater availability of alternative fish prey. Our data allow estimates of usable energy stores and flight ranges based on lipid reserves in short-tailed shearwaters. Estimated flight ranges suggest that if feeding conditions are poor near Japan or near other termination points of the transequatorial migration routes shearwaters may have few reserves available to support foraging for food and starvation events may occur. Our findings suggest how their energetic strategies and migration are shaped by seasonal and annual variability of prey during transglobal movements of short-tailed shearwaters between oceanic regions.
    Article – https://www.int-res.com/articles/meps/222/m222p265.pdf
  7. Hyrenbach, K.D., C.L. Baduini, and G.L. Hunt, Jr. (2001). Line transect estimates of Short-tailed Shearwaters (Puffinus tenuirostris) in the Southeastern Bering Sea: 1997-1999. Marine Ornithology  29: 11-18.
    Article – https://www.marineornithology.org/PDF/29_1/29_1_3.pdf
  8. Hunt, G.L., Jr., C.L. Baduini, R.D. Brodeur, K.O. Coyle, N. Kachel, J.M. Napp, S. Salo, J.D. Schumacher, P.J. Stabeno, D.A. Stockwell, T.E. Whitledge, and S.I. Zeeman. (1999). The Bering Sea in 1998: The second consecutive year of extreme weather-forced anomalies. EOS, Transactions, American Geophysical Union  80(47): 561-566.
  9. Hunt, G.L, Jr., C.L. Baduini, R.D. Brodeur, K.O. Coyle, J.M. Napp, J.D. Schumacher, P.J. Stabeno, D.A. Stockwell, T.E. Whitledge, and S.I. Zeeman . (1999). Ecosystem Responses of the Southeastern Bering Sea to abnormal weather patterns in 1997 and 1998. Report to the International Council for the Exploration of the Sea (ICES)   CM 1999/O: 06.
  10. Baduini, C.L. (1997). Spatial and temporal patterns of zooplankton biomass in Monterey Bay, California during the 1991-1993 El Niño and an assessment of the sampling design. California Cooperative Fisheries Investigations (CalCOFI) Rep   38: 193-198.
    Abstract – To estimate spatial and temporal zooplankton biomass, and the appropriateness of the sampling design, eighteen surveys were conducted in Monterey Bay, California, between November 1991 and August 1993. Vertical tows were taken to estimate zooplankton biomass in six regions of the bay on each survey day. In year 1, when 100-m vertical tows were made, zooplankton biomass peaked in January, March, and August; in year 2, when 50-ni vertical tows were made, biomass peaked in April, August, and October. Mean zooplankton biomass differed significantly among seasons for both years, but trends differed between years. In year 1, mean biomass measured in the Davidson and oceanic seasons was significantly greater than in the upwelling season. In year 2, mean biomass measured in the upwelling and oceanic seasons was significantly greater than in the Davidson period. The seasonal trends in zooplankton biomass during this study were representative of similar trends for the phytoplankton cycle in Monterey Bay, which had a spring and an autumn bloom and decreased biomass in winter. Low zooplankton levels recorded in Monterey Bay during February and April 1992 and January and March 1993 were probably related to an El Niño- Southern Oscillation warm-water event (ENSO) in 1991-93. The sampling regime adequately revealed large-scale spatial (tens of km) and temporal (seasonal) differences in zooplankton biomass, but probably does not adequately describe smaller spatial and shorter temporal processes.
    Article: URL not found