Population structure and habitat availability determine resource use by Rainbow Trout in high elevation lakes

2021 ◽  
Author(s):  
Rebekah R Stiling ◽  
Gordon W. Holtgrieve ◽  
Julian D. Olden
Keyword(s):  
Population Structure ◽  
Rainbow Trout ◽  
Resource Use ◽  
High Elevation ◽  
Habitat Availability

Productivity, resource use, and competitive interactions of Fraxinus uhdei in Hawaii uplands

2001 ◽  
Vol 31 (1) ◽  
pp. 132-142 ◽  
Author(s):  
Adrián Ares ◽  
James H Fownes
Keyword(s):  
Leaf Area ◽  
Resource Use ◽  
Basal Area ◽  
Single Species ◽  
High Elevation ◽  
Mixed Stands ◽  
Canopy Development ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency ◽  
Stand Basal Area

We examined stand growth, canopy development, and resource use of Fraxinus uhdei (Wenzig) Lingelsh, a nonindigenous tree grown in Hawaii, and its interactions with the native, N-fixing tree Acacia koa Gray. Along a gradient of decreasing rainfall with elevation, on Histosols, F. uhdei had decreased stand basal area, productivity, and canopy development. At high-elevation sites, productivity of F. uhdei was limited by N, and F. uhdei benefitted from association with A. koa, as (i) foliar N content of F. uhdei was positively related to aboveground net primary productivity (ANPP), (ii) leaf area index, biomass increment, and ANPP of F. uhdei increased in a single-species stand after N additions, but there was no response by either F. uhdei or A. koa in a mixed stand, and (iii) productivity of F. uhdei in mixed stands with A. koa at high-elevation sites was greater than in single-species stands, and F. uhdei foliage was enriched with N in proportion to the fraction of stand basal area in A. koa. Seemingly, growth of F. uhdei on Histosols was also limited by water availability, as an index of carbon isotope composition of leaves (δ13C), and, therefore, intrinsic water-use efficiency (WUE) increased with elevation. Biomass production of F. uhdei stands per unit leaf area and per unit intercepted radiation (ε) decreased with increasing elevation on Histosols. Decreased nitrogen-use efficiency and ε of F. uhdei on Histosols were both traded off against increased WUE.

Population structure of sympatric anadromous and nonanadromous Oncorhynchus mykiss: evidence from spawning surveys and otolith microchemistry

2000 ◽  
Vol 57 (10) ◽  
pp. 2152-2162 ◽  
Author(s):  
Christian E Zimmerman ◽  
Gordon H Reeves
Keyword(s):  
Population Structure ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Electron Microprobe ◽  
Otolith Microchemistry ◽  
Maternal Origin ◽  
Isolated Populations ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Deschutes River ◽  
Spawning Sites

Reproductive isolation between steelhead and resident rainbow trout (Oncorhynchus mykiss) was examined in the Deschutes River, Oregon, through surveys of spawning timing and location. Otolith microchemistry was used to determine the occurrence of steelhead and resident rainbow trout progeny in the adult populations of steelhead and resident rainbow trout in the Deschutes River and in the Babine River, British Columbia. In the 3 years studied, steelhead spawning occurred from mid March through May and resident rainbow trout spawning occurred from mid March through August. The timing of 50% spawning was 9-10 weeks earlier for steelhead than for resident rainbow trout. Spawning sites selected by steelhead were in deeper water and had larger substrate than those selected by resident rainbow trout. Maternal origin was identified by comparing Sr/Ca ratios in the primordia and freshwater growth regions of the otolith with a wavelength-dispersive electron microprobe. In the Deschutes River, only steelhead of steelhead maternal origin and resident rainbow trout of resident rainbow trout origin were observed. In the Babine River, steelhead of resident rainbow trout origin and resident rainbow trout of steelhead maternal origin were also observed. Based on these findings, we suggest that steelhead and resident rainbow trout in the Deschutes River may constitute reproductively isolated populations.

scholarly journals Habitat availability and geographic isolation as potential drivers of population structure in an oceanic dolphin in the Southwest Indian Ocean

2016 ◽  
Vol 163 (10) ◽  
Author(s):  
Amélia Viricel ◽  
Benoit Simon-Bouhet ◽  
Laura Ceyrac ◽  
Violaine Dulau-Drouot ◽  
Per Berggren ◽  
...  
Keyword(s):  
Population Structure ◽  
Indian Ocean ◽  
Habitat Availability ◽  
Geographic Isolation ◽  
Southwest Indian Ocean

Resource use within the crab-eating guild of the upper Kairezi River, Zimbabwe

1996 ◽  
Vol 12 (4) ◽  
pp. 475-490 ◽  
Author(s):  
James R. A. Butler ◽  
Brian E. Marshall
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Resource Use ◽  
Intraguild Predation ◽  
Aquatic Insects ◽  
Prey Item ◽  
Resource Partitioning ◽  
Food Resource ◽  
Dry Season ◽  
Invertebrate Drift

ABSTRACTCape clawless otters Aonyx capensis and African mottled eels Anguilla bengalensis were suspected of reducing numbers of rainbow trout Oncorhynchus mykiss in the upper Kairezi River, Zimbabwe, by preying on them and competing for the river crab Potamon perlatus. The analysis of otter, eel and trout diets showed that this is unlikely. Trout was an unimportant prey item for otters, none were found in the stomachs of 13 large eels, and any predation was probably minimised by the low densities of these predators. Some competition was probably present because crabs occurred in the diets of otters (relative occurrence 41.9%), eels (63.2%) and trout (7.4%), but it was impossible to quantify. Since these predators shared the crab food resource, the guild concept provided the basis for an analysis of their potential competitive relationships. Comparisons between the sizes of crabs selected and those available suggested that resource partitioning was occurring. Trout selected small crabs from the invertebrate drift, and because they were restricted by their mouth gapes. Otters and large eels ate larger, more abundant crab sizes; it is proposed that they instead partition resources spatially by feeding in separate micro-habitats. Intraguild predation by otters on eels may benefit trout by reducing competition for aquatic insects. Competition within the guild probably recedes in the dry season, when eels become inactive.

Fine-Scale Population Structure of Rainbow Trout in the Spokane River Drainage in Relation to Hatchery Stocking and Barriers

2007 ◽  
Vol 136 (2) ◽  
pp. 301-317 ◽  
Author(s):  
Maureen P. Small ◽  
Jason G. McLellan ◽  
Janet Loxterman ◽  
Jennifer Von Bargen ◽  
Alice Frye ◽  
...  
Keyword(s):  
Population Structure ◽  
Rainbow Trout ◽  
Fine Scale ◽  
River Drainage ◽  
Scale Population ◽  
Spokane River

scholarly journals Native and exotic fishes in a Patagonian reservoir with rainbow trout cage culture: spatial and trophic resource use

2017 ◽  
pp. 33 ◽  
Author(s):  
Diego N. Nabaes Jodar ◽  
Leandro A. Becker ◽  
Pedro Cordero ◽  
Guillermo Blasetti ◽  
Víctor E. Cussac
Keyword(s):  
Rainbow Trout ◽  
Resource Use ◽  
Cage Culture ◽  
Exotic Fishes ◽  
Trophic Resource
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