scholarly journals Fine‐scale environmental heterogeneity shapes fluvial fish communities as revealed by eDNA metabarcoding

2020 ◽  
Vol 2 (4) ◽  
pp. 647-666 ◽  
Author(s):  
Chloé Suzanne Berger ◽  
Cecilia Hernandez ◽  
Martin Laporte ◽  
Guillaume Côté ◽  
Yves Paradis ◽  
...  
Keyword(s):  
Environmental Heterogeneity ◽  
Fish Communities ◽  
Fine Scale

scholarly journals Fine-scale dietary changes between the breeding and non-breeding diet of a resident seabird

2015 ◽  
Vol 2 (4) ◽  
pp. 140291 ◽  
Author(s):  
Nicole D. Kowalczyk ◽  
André Chiaradia ◽  
Tiana J. Preston ◽  
Richard D. Reina
Keyword(s):  
Prey Availability ◽  
Juvenile Fish ◽  
Fish Communities ◽  
Small Range ◽  
Isotopic Niche ◽  
Fine Scale ◽  
Close Proximity ◽  
Isotope Analyses ◽  
Little Penguin ◽  
Foraging Ranges

Unlike migratory seabirds with wide foraging ranges, resident seabirds forage in a relatively small range year-round and are thus particularly vulnerable to local shifts in prey availability. In order to manage their populations effectively, it is necessary to identify their key prey across and within years. Here, stomach content and stable isotope analyses were used to reconstruct the diet and isotopic niche of the little penguin ( Eudyptula minor ). Across years, the diet of penguins was dominated by anchovy ( Engraulis australis ). Within years, during winter, penguins were consistently enriched in δ 15 N and δ 13 C levels relative to pre-moult penguins. This was probably due to their increased reliance on juvenile anchovies, which dominate prey biomass in winter months. Following winter and during breeding, the δ 13 C values of penguins declined. We suggest this subtle shift was in response to the increased consumption of prey that enter the bay from offshore regions to spawn. Our findings highlight that penguins have access to both juvenile fish communities and spawning migrants across the year, enabling these seabirds to remain in close proximity to their colony. However, annual fluctuations in penguin isotopic niche suggest that the recruitment success and abundance of fish communities fluctuate dramatically between years. As such, the continued monitoring of penguin diet will be central to their ongoing management.

Effects of land use and fine-scale environmental heterogeneity on net ecosystem production over a temperate coniferous forest landscape

Tellus B ◽  
2003 ◽  
Vol 55 (2) ◽  
pp. 657-668 ◽  
Author(s):  
DAVID P. TURNER ◽  
MICHAEL GUZY ◽  
MICHAEL A. LEFSKY ◽  
STEVE VAN TUYL ◽  
OSBERT SUN ◽  
...  
Keyword(s):  
Land Use ◽  
Environmental Heterogeneity ◽  
Coniferous Forest ◽  
Net Ecosystem Production ◽  
Forest Landscape ◽  
Fine Scale ◽  
Ecosystem Production ◽  
Effects Of Land Use

scholarly journals Dwarf-shrubs dynamics in Mediterranean high mountain ecosystems

2021 ◽  
Author(s):  
Andrea De Toma ◽  
Marta Carboni ◽  
Manuele Bazzichetto ◽  
Marco Malavasi ◽  
Maurizio Cutini
Keyword(s):  
Land Use ◽  
Spatial Distribution ◽  
Environmental Factors ◽  
Environmental Heterogeneity ◽  
Temporal Trends ◽  
Shrub Encroachment ◽  
High Mountain ◽  
Fine Scale ◽  
Dwarf Shrubs ◽  
The Past

AbstractQuestionVegetation in the alpine and treeline ecotone faces changes in both climate and land use. Shrub encroachment is considered an effect of these changes, but it’s still unclear how this effect is mediated by environmental heterogeneity. Our goal is to determine which environmental factors shape the fine-scale spatial distribution and temporal trends of alpine dwarf shrub.LocationThree sites in the Central Apennine, Italy.MethodsWe used a comprehensive set of environmental factors across a broad temporal span to model, at a fine-scale, both (1) the current spatial distribution and (2) the change in shrub cover over the past 60 years.ResultsOur results show that dwarf shrubs have generally increased in our study sites over the past 60 years, yet their distribution is strongly shaped by the joint influence of the fine-scale topography, productivity, land use and micro-climate. In particular, shrubs have been locally favored in areas with harsher alpine environmental constraints and stronger resource limitation. Instead, contrary to expectations, at this fine scale, warmer temperatures and the decline in grazing have not favored shrub encroachment.ConclusionDwarf shrubs appear as a stress-tolerant, pioneer vegetation that is currently distributed mainly over areas that are otherwise sparsely vegetated. It appears that shrubs exhibit poor competitive ability to invade grasslands and, though they have increased overall, they remain restricted to the least productive areas. Fine-scale environmental heterogeneity may strongly influence future responses of dwarf shrubs in changing alpine ecosystems.

Effects of land use and fine-scale environmental heterogeneity on net ecosystem production over a temperate coniferous forest landscape

Tellus B ◽  
2003 ◽  
Vol 55 (2) ◽  
pp. 657-668 ◽  
Author(s):  
David P. Turner ◽  
Michael Guzy ◽  
Michael A. Lefsky ◽  
Steve Van Tuyl ◽  
Osbert Sun ◽  
...  
Keyword(s):  
Land Use ◽  
Environmental Heterogeneity ◽  
Coniferous Forest ◽  
Net Ecosystem Production ◽  
Forest Landscape ◽  
Fine Scale ◽  
Ecosystem Production ◽  
Effects Of Land Use

scholarly journals Incorporating fine‐scale environmental heterogeneity into broad‐extent models

2019 ◽  
Vol 10 (6) ◽  
pp. 767-778 ◽  
Author(s):  
Laura J. Graham ◽  
Rebecca Spake ◽  
Simon Gillings ◽  
Kevin Watts ◽  
Felix Eigenbrod
Keyword(s):  
Environmental Heterogeneity ◽  
Fine Scale
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