Life history patterns of Hydropsyche bronta and H. morosa (Trichoptera: Hydropsychidae) in summer-warm rivers of southern Ontario

1984 ◽  
Vol 62 (2) ◽  
pp. 271-275 ◽  
Author(s):  
Rosemary J. Mackay
Keyword(s):  
Life History ◽  
Second Order ◽  
Southern Ontario ◽  
Larval Instars ◽  
Life History Patterns

Life history patterns are described for Hydropsyche bronta and Hydropsyche morosa in the Credit and Humber rivers of southern Ontario. In the lower reaches (stream orders 4 and 5) of these rivers, summer water temperatures exceed 24 °C for 3 months and reach maxima of 27–30 °C. Here H. morosa appeared to be bivoltine while at least half of the H. bronta population at each of four sites was trivoltine. At a fifth site below an impoundment on a second-order tributary to the Humber, H. bronta was bivoltine; H. morosa was extremely rare at this site and in upper reaches in general. Hydropsyche bronta is smaller than H. morosa and tends to overwinter in slightly older larval instars than H. morosa. Both these characteristics, and the fact that H. bronta is probably living in the optimal part of its habitat range in the Credit and Humber, may explain its ability to be trivoltine.

Variability in the life-history patterns of four species of Hydropsyche (Trichoptera: Hydropsychidae) in southern Ontario streams

Ecography ◽  
1986 ◽  
Vol 9 (2) ◽  
pp. 149-163 ◽  
Author(s):  
Jane E. Rutherford ◽  
Rosemary J. Mackay
Keyword(s):  
Life History ◽  
Southern Ontario ◽  
Life History Patterns

Life history patterns of some species of Hydropsyche (Trichoptera: Hydropsychidae) in southern Ontario

1979 ◽  
Vol 57 (5) ◽  
pp. 963-975 ◽  
Author(s):  
Rosemary J. Mackay
Keyword(s):  
Life History ◽  
Food Quality ◽  
Larval Instar ◽  
Life Cycles ◽  
Larval Size ◽  
Southern Ontario ◽  
Ecological Segregation ◽  
Summer Generation ◽  
Life History Patterns ◽  
Slow Growing

Life history patterns are described for five species of Hydropsyche in the Credit and Humber rivers. Larvae of univoltine species matured in May or June. Bivoltine species had a fast-growing summer generation of larvae maturing in July or August and a slow-growing winter generation of larvae maturing in April or May. Hydropsyche betteni, H. dicantha, H. slossonae, and H. sparna were bivoltine at some sampling stations, univoltine at others. Hydropsyche scalaris was exclusively univoltine. Most species were represented by many instars concurrently during summer. Overwintering occurred in a smaller number of instars. Species that overwintered in the final or penultimate larval instar were more likely to mature early and to be bivoltine than species overwintering in younger instars. High summer water temperatures and (or) food quality increased growth rates and the probability that a summer generation could mature before fall. Smaller species were more likely to be multivoltine than larger species.Differences among the life cycles of the five species did not suggest effective ecological segregation in summer in terms of larval size. Different overwintering stages among the species may prove to be important factors controlling the number of generations per year.

Recognition of larvae of the Tetrabothriidae (Eucestoda): implications for the origin of tapeworms in marine homeotherms

1987 ◽  
Vol 65 (4) ◽  
pp. 997-1000 ◽  
Author(s):  
Eric P. Hoberg
Keyword(s):  
Life History ◽  
Phylogenetic Relationships ◽  
Host Switching ◽  
Larval Morphology ◽  
Dominant Group ◽  
Marine Birds ◽  
Marine Communities ◽  
Definitive Evidence ◽  
Life History Patterns ◽  
Ecological Associations

The Tetrabothriidae represent the dominant group of cestodes, previously known only as adult parasites, in marine birds and mammals. Recognition of their unique plerocercoid larvae provides the first definitive evidence for life history patterns and phylogenetic relationships with other cestodes. Affinities of the Tetrabothriidae and Tetraphyllidea, cestodes of elasmobranchs, are indicated by larval morphology and ontogeny. However, patterns of sequential heterochrony in the ontogeny of the adult scolex of Tetrabothrius sp. appear to be unique among the Eucestoda. Tetrabothriids constitute a fauna that originated by host switching from elasmobranchs to homeotherms, via ecological associations, following invasion of marine communities by birds and mammals in the Tertiary.

LIFE HISTORY AND HABITS OF A LEAF TIER, AROGA ARGUTIOLA (LEPIDOPTERA: GELECHIIDAE), ON SWEET FERN IN MICHIGAN

1974 ◽  
Vol 106 (9) ◽  
pp. 991-994 ◽  
Author(s):  
Louis F. Wilson
Keyword(s):  
Life History ◽  
Larval Instars

AbstractAroga argutiola is univoltine in Michigan. The adult emerges in late May and oviposits on sweet fern (Myrica aspleniifolia L.). There are six larval instars. The larva constructs a nest by tying leaves together, and then feeding on the leaves in and adjacent to the nest. The last instar overwinters on the ground in a cocoon. The pupa appears in May.

Life history patterns of a livebearing fish in contrasting environments

Oecologia ◽  
1979 ◽  
Vol 40 (2) ◽  
pp. 189-201 ◽  
Author(s):  
G. D. Constantz
Keyword(s):  
Life History ◽  
Life History Patterns ◽  
Livebearing Fish

scholarly journals Effects of Climate and Biotic Factors on Life History Characteristics and Vital Rates of Yellowstone Cutthroat Trout in Spread Creek, Wyoming

2013 ◽  
Vol 36 ◽  
pp. 160-174
Author(s):  
Patrick Uthe ◽  
Robert Al-Chokhachy
Keyword(s):  
Life History ◽  
Brook Trout ◽  
Cutthroat Trout ◽  
Conservation Strategies ◽  
Snake River ◽  
Vital Rates ◽  
Factors Influencing ◽  
Yellowstone Cutthroat Trout ◽  
Life History Patterns ◽  
Diversity Of Life

The Upper Snake River represents one of the largest remaining strongholds of Yellowstone cutthroat across its native range. Understanding the effects of restoration activities and the diversity of life-history patterns and factors influencing such patterns remains paramount for long-term conservation strategies. In 2011, we initiated a project to quantify the success of the removal of a historic barrier on Spread Creek and to evaluate the relative influence of different climate attributes on native Yellowstone cutthroat trout and non-native brook trout behavior and fitness. Our results to date have demonstrated the partial success of the dam removal with large, fluvial Yellowstone cutthroat trout migrating up Spread Creek to spawn, thus reconnecting this population to the greater Snake River metapopulation. Early indications from mark-recapture data demonstrate considerable differences in life-history and demographic patterns across tributaries within the Spread Creek drainage. Our results highlight the diversity of life-history patterns of resident and fluvial Yellowstone cutthroat trout with considerable differences in seasonal and annual growth rates and behavior across populations. Continuing to understand the factors influencing such patterns will provide a template for prioritizing restoration activities in the context of future challenges to conservation (e.g., climate change).

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