scholarly journals Habitat preference and life history of the mayflies Metamonius anceps Eaton (Nesameletidae) and Meridialaris chiloeensis Demoulin (Leptophlebiidae) in a Patagonian mountain stream

2006 ◽  
Vol 42 (4) ◽  
pp. 233-240 ◽  
Author(s):  
M. E.T. Hollmann ◽  
M. L. Miserendino
Keyword(s):  
Life History ◽  
Habitat Preference ◽  
Mountain Stream ◽  
History Of

Life History of Juvenile Ocean-type Chinook Salmon (Oncorhynchus tshawytscha) in the Situk River, Alaska

1992 ◽  
Vol 49 (12) ◽  
pp. 2621-2629 ◽  
Author(s):  
S. W. Johnson ◽  
J. F. Thedinga ◽  
K. V. Koski
Keyword(s):  
Life History ◽  
Chinook Salmon ◽  
Habitat Preference ◽  
Oncorhynchus Tshawytscha ◽  
Fork Length ◽  
Main Stem ◽  
Seawater Tolerance ◽  
History Of ◽  
Two Phases ◽  
Stream Type

Distribution, abundance, habitat preference, migration and residence timing, seawater tolerance, and size were determined for juvenile ocean-type (age 0) chinook salmon (Oncorhynchus tshawytscha) in the Situk River, Alaska. Chinook primarily occupied main-stem habitats (channel edges in spring, pools and willow edges in summer). Peak chinook densities in the upper and lower main stem were 96 and 76 fish/100 m2, respectively. Chinook migrated downstream in two phases: a spring dispersal of emergent fry and a summer migration. Chinook marked in the upper river in late June and early July were recaptured 20 km downstream in the lower river in late July. Marked chinook resided in the lower river up to 34 d. Mean fork length of chinook in the lower river increased from 40 mm in May to 80 mm in early August. By late August, chinook had emigrated from the lower river at a size of approximately 80 mm. Fish this size were seawater tolerant and had the physical appearance of smolts. Ocean-type chinook in the Situk River are unique because in most Alaskan streams, chinook are stream-type (rear in freshwater at least 1 yr).

Life history of Neoplasta parahebes (Diptera: Empididae: Hemerodromiinae)

2011 ◽  
Vol 143 (4) ◽  
pp. 392-398
Author(s):  
J. Robert Harkrider
Keyword(s):  
Life History ◽  
Wood Surface ◽  
Room Temperature ◽  
Mountain Stream ◽  
Dead Tree ◽  
History Of ◽  
Ovipositor Morphology ◽  
Decaying Wood ◽  
Gravid Females ◽  
Wood Boring

AbstractThe life history of Neoplasta parahebes MacDonald and Turner in a mountain stream in Southern California is reported. Female N. parahebes were separated from sympatric female Neoplasta hebes Melander by ovipositor morphology. Adults readily fed on adult midges (Diptera: Chironomidae) smaller than themselves. Ovarioles of gravid females contained an average of 74.8 eggs. Mating occurred in a unidirectional position. Females oviposited under the bark of submerged decaying wood. Eggs averaged 459 μm × 115 μm in size; most were laid within a 24 h period and, at room temperature, hatched in 10–11 days. There are three larval instars. Densities of larval N. parahebes were as high as 9.2 per 100 cm2 of wood surface in submerged dead tree branches. Branches also contained larvae of Orthocladius lignicola Kieffer, a wood-boring chironomid; larval N. parahebes readily fed on the midge larvae in their tunnels. Pupation occurred in the decaying wood.

Host phenologies and the life history of horsehair worms (Nematomorpha, Gordiida) in a mountain stream in northern Japan

2020 ◽  
Vol 35 (3) ◽  
pp. 482-493 ◽  
Author(s):  
Nanoko Meguro ◽  
Osamu Kishida ◽  
Shunsuke Utsumi ◽  
Shigeru Niwa ◽  
Susumu Igarashi ◽  
...  
Keyword(s):  
Life History ◽  
Mountain Stream ◽  
History Of ◽  
Northern Japan

The life history of Philocasca alba (Trichoptera: Limnephilidae) in a Rocky Mountain stream

1984 ◽  
Vol 62 (7) ◽  
pp. 1282-1288 ◽  
Author(s):  
R. A. Mutch ◽  
G. Pritchard
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Rocky Mountains ◽  
Laboratory Experiments ◽  
Larval Instar ◽  
Rocky Mountain ◽  
Mountain Stream ◽  
Flight Period ◽  
Conifer Needles ◽  
History Of

The life cycle of Philocasca alba Nimmo spans 3 years in a cold, second order, subalpine stream in the Rocky Mountains of Alberta. The flight period was from mid-May to late July. Larval instar 1 was found only in August–September; all other four instars were present in samples throughout most of the year. In their third autumn in the stream larvae in the final instar burrowed into gravel, pupated, and overwintered. Growth was confined to the ice-free period, June to November, when larval densities were greatest among deposits of conifer needles, cones, and woody material in pools. Larvae from these detrital accumulations had mainly fragments of conifer needles in their guts, although laboratory experiments showed that larvae could feed and grow on conifer needles only if they were highly conditioned. The later instars, particularly instar V, constituted a much greater than expected proportion of total larvae among submerged bank vegetation in spring and summer and deciduous leaves in autumn. Larvae in these two microhabitats mainly had fragments of moss and fragments of leaves, respectively, in their guts. The importance of moss was confirmed by a field experiment which showed that fifth instar larvae had significantly faster growth rates when fed on detritus supplemented with bank moss than detritus alone or detritus supplemented with deciduous leaves during the autumn.

Experimental life history of Echinostoma cinetorchis

1990 ◽  
Vol 28 (1) ◽  
pp. 39 ◽  
Author(s):  
S H Lee ◽  
J Y Chai ◽  
S T Hong ◽  
W M Sohn
Keyword(s):  
Life History ◽  
History Of
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