My research focuses on the environmental constraints imposed on marine and estuarine species. More specifically, this encompasses (1) physiological, behavioral, and ecological responses to environmental change and environmental stress, (2) environmental effects on life histories, distributions, and population dynamics, and (3) anthropogenic impacts on organism-environment interactions. My research lies at the intersection of several disciplines and combines field and laboratory experimentation with quantitative and spatial analyses of long-term datasets to better understand the interactions between marine organisms and their environments. This research also has a strong applied focus, using ecophysiological approaches to address fisheries management and conservation questions. Please look through the information on my research and teaching, and contact me if you have any questions or are interested in joining my lab.
I am currently recruiting both undergraduate and graduate (M.S.) students to work in my lab. Please contact me for more information.
Samantha Humphrey: Samantha is an M.S. student in the Marine and Environmental Biology program. She began in Fall 2014 and her research is investigating maternal care behaviors in blue crabs.
Andrew Cumberland: Andrew is an undergraduate Biology major (Marine Biology concentration) who has been working in the lab since Fall 2014, first as a volunteer and now for course credit. Andrew's research project involves refining rearing protocols for juvenile blue crabs in a recirculating, artificial seawater system.
Erika Nuss: Erika is an undergraduate Biology major (Marine Biology concentration) who is currently working as a lab technician. Erika will primarily be responsible for testing a system for monitoring body temperature and heart rate in fiddler crabs, blue crabs, and crawfish.
Department of Biological Sciences
Nicholls State University
P.O. Box 2021
Thibodaux, LA 70310
Phone: (985) 448-4709
Please email me if you are unable to access a PDF of any of these papers.
(17) Darnell, M.Z., K.K. Fowler*, P. Munguia. 2013. Sex-specific thermal constraints on fiddler crab behavior. Behavioral Ecology 24: 991-1003. Link
(16) Kronstadt, S.M.*, M.Z. Darnell, P. Munguia. 2013. Background and temperature effects on Uca panacea color change. Marine Biology 160: 1373-1381. Link
(15) Darnell, M.Z. 2012. Ecological physiology of the circadian pigmentation rhythm in the fiddler crab Uca panacea. Journal of Experimental Marine Biology and Ecology 426-427: 39-47. Link
(14) Darnell, M.Z., T.G. Wolcott, D. Rittschof. 2012. Environmental and endogenous control of selective tidal-stream transport behavior during blue crab Callinectes sapidus spawning migrations. Marine Biology 159: 621-631. Link
(13) Darnell, M.Z., P. Munguia. 2011. Thermoregulation as an alternate function of the sexually dimorphic fiddler crab claw. The American Naturalist 178: 419-428. PDF
(12) Hines, A.H., E.G. Johnson, M.Z. Darnell, D. Rittschof, T.J. Miller, L.J. Bauer, P. Rodgers, R. Aguilar. 2010. Predicting effects of climate change on blue crabs in Chesapeake Bay. In: Kruse, G.H., G.L. Eckert, R.J. For, R.N. Lipcius, B. Sainte-Marie, D.L. Stram, D. Woodby (eds) Biology and Management of Exploited Crab Populations Under Climate Change. Alaska Sea Grant College Program, Fairbanks. PDF
(11) Rittschof, D., M.Z. Darnell, K.M. Darnell, M. Goldman, M.B. Ogburn, R.E. McDowell. 2010. Estimating relative abundance of the female blue crab spawning stock in North Carolina. In: Kruse, G.H., G.L. Eckert, R.J. For, R.N. Lipcius, B. Sainte-Marie, D.L. Stram, D. Woodby (eds) Biology and Management of Exploited Crab Populations Under Climate Change. Alaska Sea Grant College Program, Fairbanks. PDF
(10) Darnell, M.Z., K.M. Darnell, R.E. McDowell, D. Rittschof. 2010. Postcapture survival and future reproductive potential of ovigerous blue crabs Callinectes sapidus caught in the central North Carolina pot fishery. Transactions of the American Fisheries Society 139: 1677-1687. PDF
(9) Darnell, M.Z., D. Rittschof, R.B. Forward Jr. 2010. Endogenous swimming rhythms underlying the spawning migration of the blue crab, Callinectes sapidus: ontogeny and variation with ambient tidal regime. Marine Biology 157: 2415-2425. PDF
(8) Darnell, M.Z., D. Rittschof. 2010. Role of larval release pheromones and peptide mimics in abdominal pumping and swimming behavior of ovigerous blue crabs, Callinectes sapidus. Journal of Experimental Marine Biology and Ecology 391: 112-117. PDF
(7) Darnell, M.Z., D. Rittschof, K.M. Darnell, R.E. McDowell. 2009. Lifetime repoductive potential of female blue crabs Callinectes sapidus in North Carolina, USA. Marine Ecology Progress Series 394: 153-163. PDF
(6) Forward Jr, R.B., M.H. Bourla*, M.Z. Darnell, J.H. Cohen. 2009. Entrainment of the circadian rhythm of the supratidal amphipod Talorchestia longicornis by light and temperature: mechanisms of detection and hierarchical organization. Marine and Freshwater Behaviour and Physiology 42: 233-247. PDF
(5) Ramach, S.M., M.Z. Darnell, N.G. Avissar, D. Rittschof. 2009. Habitat use and population dynamics of blue crabs, Callinectes sapidus, in a high-salinity embayment. Journal of Shellfish Research 28: 635-640. PDF
(4) Darnell, M.Z., M.B. Ogburn, H. Diaz. 2008. A novel running wheel apparatus to monitor locomotor rhythms in land crabs. Marine and Freshwater Behaviour and Physiology 41: 205-210. PDF
(3) Welch, M.E., M.Z. Darnell, D.E. McCauley. 2006. Variable populations within variable populations: quantifying mitochondrial heteroplasmy in natural populations of the gynodioecious plant Silene vulgaris. Genetics 174: 829-837. PDF
(2) Forward Jr, R.B., J.H. Cohen, M.Z. Darnell, A. Saal. 2005. The circatidal rhythm in vertical swimming of female blue crabs, Callinectes sapidus, during their spawning migration: A reconsideration. Journal of Shellfish Research 24: 587-590. PDF
(1) McCauley, D.E., M.F. Bailey, N.A. Sherman, M.Z. Darnell. 2005. Evidence for paternal transmission and heteroplasmy in the mitochondrial genome of Silene vulgaris, a gynodioecious plant. Heredity 95: 50-58. PDF
Marine and Environmental Biology I (BIOL 551) is a core course in our M.S. program in Marine and Environmental Biology. My goals for this course are for students to to gain a thorough understanding of ecological principles from readings and discussions of foundational papers and to stimulate critical thinking about ecological theory, experimental design, and the current state of research in the field. This is a discussion-based course with discussions focusing on the primary literature, including both foundational papers as well as more current papers. The 2014 syllabus can be downloaded here.
Marine Field Ecology is offered at LUMCON during even-year summers. This course focuses on introducting students to the marine environment through a number of excursions to local habitats throughout the Louisiana Coastal Zone. Students spend the first two weeks of the course exploring the local environment and learning basic principles of marine ecology. The second two weeks of the course are devoted to original research projects conducted in groups of 2–3 students. The 2014 syllabus can be downloaded here.
Introduction to Marine Biology (BIOL 283/284) is offered during the Fall semester. This course has two primary objectives. The first is for students to gain an understanding of and appreciation for life in the the marine environment. The second goal is for students to develop a mechanistic understanding of the processes structuring marine populations, communities, and ecosystems. We will take a process-based approach to study the diversity of life in the oceans, the interactions between these organisms, and the interactions between organisms and their environment. The 2014 syllabi can be downloaded here (Biol 283, lecture) and here (Biol 284, lab).
Invertebrate Zoology (BIOL 354) is offered during the Spring semester. The primary objective of this course is for students to gain an understanding of and appreciation for the diversity of invertebrate life in marine, freshwater, and terrestrial environments. We will work our way through the invertebrate phyla from Porifera to Chordata, focusing on form, function, and phylogeny. In addition to lectures, dissections and labs will be used to explore invertebrate anatomy, morphology, and behavior, and field trips to local habitats will be used to collect invertebrate organisms and explore relationships between invertebrates and their environment. The 2015 syllabus can be downloaded here.
Prior to coming to Nicholls, I taught several courses at the University of Texas at Austin, including Marine Invertebrates, Marine Environmental Science, and Laboratory Studies in Marine Ecology.