Testing Plasticity of Developmental Strategy in the Aquatic Dipteran Larvae of Corethrella Appendiculata

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Material Information

Title:
Testing Plasticity of Developmental Strategy in the Aquatic Dipteran Larvae of Corethrella Appendiculata
Physical Description:
1 online resource (117 p.)
Language:
english
Creator:
Blosser, Erik M
Publisher:
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Degree:
Doctorate ( Ph.D.)
Degree Grantor:
University of Florida
Degree Disciplines:
Entomology and Nematology
Committee Chair:
LOUNIBOS,L P
Committee Co-Chair:
O'MEARA,GEORGE F
Committee Members:
BROCKMANN,H J
DODD,C KENNETH,JR
JULIANO,STEVEN ANTHONY

Subjects

Subjects / Keywords:
canalization -- corethrella -- development -- nutrition -- plasticity -- threshold
Entomology and Nematology -- Dissertations, Academic -- UF
Genre:
Entomology and Nematology thesis, Ph.D.
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
born-digital   ( sobekcm )
Electronic Thesis or Dissertation

Notes

Abstract:
Developmental strategies among insects are known from a relatively few, well-studied species. Among these species, differences in the ability to respond to variable environmental factors with changes in development are likely related to qualities of the species' natural habitat. Aquatic dipteran larvae in temporary habitats face variations in food availability and temperature as well as threats from drying and predation which may favor the development of plastic developmental strategies. Developmental plasticity was tested in the aquatic larvae of the predatory midge, Corethrella appendiculata. Using previously developed models comparing development time to food consumption, individual midge larvae were tested for plasticity in developmental thresholds and post-threshold period over a range of food treatment levels. Final instar midges were found to have no plasticity in pupation threshold or post-threshold time with varying food levels. Though egg number varied with nutrient availability, no plasticity was found in the reproductive strategy of autogenous egg development. Further testing at differing temperatures found no plasticity of threshold in response to temperature, although developmental time was shortened through higher daily food consumption and shorter post-threshold time at higher temperature. The effects of food environment on a previous instar were found to carry over to affect development time in the final instar. This developmental inertia was found in two separate experiments: one using developmental models and one using a food switching technique. When penultimate instars were given low food treatments, development time was increased during the following final instar. This effect was due to the necessity of consuming more prey before reaching the pupation threshold, though it is unclear whether this was due to an adaptively increased threshold or a reduction in assimilation efficiency. Final instar head capsule size and adult fitness traits (egg number, winglength and egg size) were not affected by previous instar food conditions. Results suggest that C. appendiculata may be adapted to its semi-permanent larval environment through a long post-threshold period which allows collection of food under good conditions and escape under poor ones. Comparison with species from more temporary aquatic habitats could test the extent of these conclusions.
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Bibliography:
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Statement of Responsibility:
by Erik M Blosser.
Thesis:
Thesis (Ph.D.)--University of Florida, 2014.
Local:
Adviser: LOUNIBOS,L P.
Local:
Co-adviser: O'MEARA,GEORGE F.
Electronic Access:
RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2014-11-30

Record Information

Source Institution:
UFRGP
Rights Management:
Applicable rights reserved.
Classification:
lcc - LD1780 2014
System ID:
UFE0046606:00001