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Subject: Re: Daphnia lumholtzi3 -Reply
From: Don Pereira <[log in to unmask]>
Reply-To:Academic forum on fisheries ecology and related topics <[log in to unmask]>
Date:Thu, 24 Apr 1997 11:34:06 -0500
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My apologies if someone has already suggested anti-predator defense as
a possible answer to why D. lumholtzi has long spines.  I have been
out of the office for a week and did not read the early submittals to
the list on this topic.

It's been several years since I have been in to the zooplankton
literature, but here are a few references pertaining to
cyclomorphosis:

Brett, M.T.  1992.  Chaoborus and Fish-Mediated Influences on
Daphnia-Longispina Population Structure, Dynamics and Life History
Strategies.  Oecologia 89: 69-77.

Hanazato, T.  1990.  Induction of Helmet Development by a Chaoborus
Factor in Daphnia-Ambigua During Juvenile Stages.  Journal of
Plankton Research 12: 1287-1294.

Hanazato, T.  1991.  Effects of a Chaoborus-Released Chemical on
Daphnia-Ambigua - Reduction in the Tolerance of the Daphnia to Summer
Water Temperature.  Limnology and Oceanography 36: 165-171.

Hanazato, T.  1991.  Influence of Food Density on the Effects of a
Chaoborus-Released Chemical on Daphnia-Ambigua.  Freshwater Biology
25: 477-483.

Machacek, J.  1991.  Indirect Effect of Planktivorous Fish on the
Growth and Reproduction of Daphnia galeata.  Hydrobiologia 225:
193-197.

Parejko, K., and S.I. Dodson.  1991.  The evolutionary scology of an
antipredator reaction norm: Daphnia pulex and Chaoborus americanus.
Evolution 45: 1665-1674.

Pijanowska, J.  1990.  Cyclomorphosis in Daphnia - An Adaptation to
Avoid Invertebrate Predation.  Hydrobiologia 198: 41-50.

Pijanowska, J.  1991.  Seasonal changes in morphology of Daphnia
cucullata SARs.  Archiv Fur Hydrobiologie 121: 79-86.

Pijanowska, J.  1992.  Anti-Predator Defence in 3 Daphnia Species.
Internationale Revue der Gesamten Hydrobiologie 77: 153-163.

Ramcharan, C.W., S.I. Dodson, and J. Lee.  1992.  Predation Risk,
Prey Behavior, and Feeding Rate in Daphnia-Pulex.  Canadian Journal
of Fisheries and Aquatic Sciences 49: 159-165.

Ramcharan, C.W., and W.G. Sprules.  1991.  Predator-Induced
Behavioral Defense and Its Ecological Consequences for 2 Calanoid
Copepods.  Oecologia 86: 276-286.

Riessen, H.P., and W.G. Sprules.  1990.  Demographic costs of
antipredator defenses in Daphnia pulex.  Ecology 71: 1536-1546.

Tollrian, R.  1990.  Predator-Induced Helmet Formation in
Daphnia-Cucullata (SARs).  Archiv Fur Hydrobiologie 119: 191-196.

<><><><><><><><><><><><><><><><><><><><><><><><><><>
Don Pereira
            (612) 772-7962
Minnesota DNR
Fax (612) 772-7977
1200 Warner Rd.
St. Paul, MN  55106                Internet:
[log in to unmask]


"Any man who pits his intelligence against a fish and loses has it
coming."

         --  John Steinbeck

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