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You searched for: Journal Ecology Remove constraint Journal: Ecology Publication Year 2005 Remove constraint Publication Year: 2005 Source 2005 v.86 no.1 Remove constraint Source: 2005 v.86 no.1
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1. Are invasive species the drivers or passengers of change in degraded ecosystems?

Author:
MacDougall, Andrew S.; Turkington, Roy
Source:
Ecology 2005 v.86 no.1 pp. 42-55
ISSN:
0012-9658
Subject:
savannas; Poa pratensis; Dactylis glomerata; grasses; invasive species; plant competition; ecological succession; environmental degradation; plant ecology; British Columbia
Abstract:
... Few invaded ecosystems are free from habitat loss and disturbance, leading to uncertainty whether dominant invasive species are driving community change or are passengers along for the environmental ride. The “driver” model predicts that invaded communities are highly interactive, with subordinate native species being limited or excluded by competition from the exotic dominants. The “passenger” mo ...
DOI:
10.1890/04-0669

2. Biogeochemical and metabolic responses to the flood pulse in a semiarid floodplain

Author:
Valett, H. M.; Baker, M. A.; Morrice, J. A.; Crawford, C. S.; Molles, M. C., Jr.; Dahm, C. N.; Moyer, D. L.; Thibault, J. R.; Ellis, Lisa M.
Source:
Ecology 2005 v.86 no.1 pp. 220-234
ISSN:
0012-9658
Subject:
semiarid zones; floodplains; rivers; riparian forests; forest ecosystems; soil nutrient dynamics; forest soils; soil respiration; hydrochemistry; water analysis; New Mexico
Abstract:
... Flood pulse inundation of riparian forests alters rates of nutrient retention and organic matter processing in the aquatic ecosystems formed in the forest interior. Along the Middle Rio Grande (New Mexico, USA), impoundment and levee construction have created riparian forests that differ in their inter‐flood intervals (IFIs) because some floodplains are still regularly inundated by the flood pulse ...
DOI:
10.1890/03-4091

3. Biomass accumulation after 10–200 years of shifting cultivation in bornean rain forest

Author:
Lawrence, Deborah
Source:
Ecology 2005 v.86 no.1 pp. 26-33
ISSN:
0012-9658
Subject:
secondary forests; tropical rain forests; shifting cultivation; deforestation; dry matter accumulation; fallow; history; life history; plant density; soil fertility; carbon sequestration; Indonesia; Borneo
Abstract:
... I examined the effect of repeated long‐fallow shifting cultivation on biomass accumulation in a rain‐forest landscape occupied for over 200 years in West Kalimantan, Indonesia. The diameters of stems >5 cm dbh were measured in nine secondary forests using a stratified random design of nested plots (3000 m² per site). The stands were 9–12 years old and had experienced from 1 to 10 or more cycles of ...
DOI:
10.1890/03-0564

4. Colonization–extinction dynamics of an epiphyte metapopulation in a dynamic landscape

Author:
Snäll, Tord; Ehrlén, Johan; Rydin, Håkan
Source:
Ecology 2005 v.86 no.1 pp. 106-115
ISSN:
0012-9658
Subject:
mosses and liverworts; colonizing ability; extinction; population dynamics; host plants; forest trees; population size; simulation models; Sweden
Abstract:
... Metapopulation dynamics have received much attention in population biology and conservation. Most studies have dealt with species whose population turnover rate is much higher than the rate of patch turnover. Models of the dynamics in such systems have assumed a static patch landscape. The dynamics of many species, however, are likely to be significantly affected by the dynamics of their patches. ...
DOI:
10.1890/04-0531

5. Density dependence in north american ducks

Author:
Viljugrein, Hildegunn; Stenseth, Nils Chr; Smith, Graham W.; Steinbakk, Gunnhildur H.
Source:
Ecology 2005 v.86 no.1 pp. 245-254
ISSN:
0012-9658
Subject:
waterfowl; prairies; population dynamics; population density; population size; statistical models; breeding sites
Abstract:
... Knowing whether, and to what extent, populations are regulated by density‐dependent factors is important both in its own right and when developing management strategies for wildlife species. However, available tests for density dependence are typically sensitive to sampling errors in the data. By using a state‐space modeling approach, incorporating both an ecological process model and an observati ...
DOI:
10.1890/04-0467

6. Early performance predicts canopy attainment across life histories in subalpine forest trees

Author:
Landis, R. Matthew; Peart, David R.
Source:
Ecology 2005 v.86 no.1 pp. 63-72
ISSN:
0012-9658
Subject:
Abies balsamea; Betula cordifolia; Betula pubescens var. pumila; Picea rubens; canopy; forest trees; life history; models; population ecology; saplings; shade tolerance; subalpine forests; Northeastern United States
Abstract:
... Few individuals in canopy tree species attain the canopy and reproduce. Understanding why these select few succeed is fundamental to tree population ecology and forest community dynamics. Yet our understanding remains poor, because the time required to reach the canopy is long relative to experimental and demographic studies. We used a simple, yet powerful, approach to examine the long‐term proces ...
DOI:
10.1890/03-0848

7. Effects of changing climate on zooplankton and juvenile sockeye salmon growth in southwestern alaska

Author:
Schindler, Daniel E.; Rogers, Donald E.; Scheuerell, Mark D.; Abrey, Caryn A.
Source:
Ecology 2005 v.86 no.1 pp. 198-209
ISSN:
0012-9658
Subject:
climate change; ice; Oncorhynchus nerka; zooplankton; animal growth; population density; time series analysis; equations; Alaska
Abstract:
... Detecting and forecasting the effects of changing climate on natural and exploited populations represent a major challenge to ecologists and resource managers. These efforts are complicated by underlying density‐dependent processes and the differential responses of predators and their prey to changing climate. We explored the effects of density‐dependence and changing climate on growth of juvenile ...
DOI:
10.1890/03-0408

8. Environmental constraints on a global relationship among leaf and root traits of grasses

Author:
Craine, Joseph M.; Lee, William G.; Bond, William J.; Williams, Richard J.; Johnson, Loretta C.
Source:
Ecology 2005 v.86 no.1 pp. 12-19
ISSN:
0012-9658
Subject:
grasslands; grasses; roots; leaves; traits; nitrogen content; plant anatomy; quantitative genetics; environmental factors; geographical variation; New Zealand; Australia; South Africa; North America
Abstract:
... Uncertainties regarding the relationships between leaf and root traits have impeded an integrated understanding of plant evolution and the efficient parameterization of ecosystem models. We measured key root and leaf traits of grasses from 77 sites in four grassland regions of the world (New Zealand, Australia, South Africa, North America). Within each region, the relationships among leaf traits p ...
DOI:
10.1890/04-1075

9. Eutrophication due to phosphorus recycling in relation to lake morphometry, temperature, and macrophytes

Author:
Genkai-Kato, Motomi; Carpenter, Stephen R.
Source:
Ecology 2005 v.86 no.1 pp. 210-219
ISSN:
0012-9658
Subject:
limnology; lakes; eutrophication; phosphorus; pollution load; water management; macroalgae; mathematical models; equations
Abstract:
... Lakes may have alternative states due to excessive phosphorus (P) input: a clear‐water state and turbid one with high chlorophyll concentrations. Because shifts between these states have large ecosystem effects, and restoration after the shifts is costly or sometimes impossible, precise evaluation of the possibility of alternative states is needed for lake management. Yet the shifts are quite vari ...
DOI:
10.1890/03-0545

10. Fighting for resources: the economics of defense and appropriation

Author:
Dubois, Frédérique; Giraldeau, Luc-Alain
Source:
Ecology 2005 v.86 no.1 pp. 3-11
ISSN:
0012-9658
Subject:
ecological competition; aggression; population size; population density; predation; evolutionarily stable strategy; mathematical models
Abstract:
... The study of the ecological factors that govern fighting over resources has been analyzed by resource defense theory and evolutionary hawk–dove games. In essence, the models predict that increasing economic defendability of a resource should lead to increased frequency of aggression among competitors. We question this prediction because it is based on the assumption that individuals that do not po ...
DOI:
10.1890/04-0566

11. Fitness effects from egg to reproduction: bridging the life history transition

Author:
De Block, Marjan; Stoks, Robby
Source:
Ecology 2005 v.86 no.1 pp. 185-197
ISSN:
0012-9658
Subject:
Lestes; life history; developmental stages; insect development; environmental factors; eclosion; body size
Abstract:
... Although complex life cycles are widespread, we know little about how constraints in the larval stage influence adult fitness. Most models assume a tight coupling of larval conditions and adult fitness through size and timing of the life history transition. However, there are few empirical tests of this assumption. We combined an experimental manipulation of larval environment with a subsequent st ...
DOI:
10.1890/04-0116

12. Hurricanes and caribbean coral reefs: impacts, recovery patterns, and role in long‐term decline

Author:
Gardner, Toby A.; Côté, Isabelle M.; Gill, Jennifer A.; Grant, Alastair; Watkinson, Andrew R.
Source:
Ecology 2005 v.86 no.1 pp. 174-184
ISSN:
0012-9658
Subject:
coral reefs; hurricanes
Abstract:
... The decline of corals on tropical reefs is usually ascribed to a combination of natural and anthropogenic factors, but the relative importance of these causes remains unclear. In this paper, we attempt to quantify the contribution of hurricanes to Caribbean coral cover decline over the past two decades using meta‐analyses. Our study included published and unpublished data from 286 coral reef sites ...
DOI:
10.1890/04-0141

13. Implications of seed banking for recruitment of southern appalachian woody species

Author:
Hille Ris Lambers, Janneke; Clark, James S.; Lavine, Michael
Source:
Ecology 2005 v.86 no.1 pp. 85-95
ISSN:
0012-9658
Subject:
temperate forests; deciduous forests; forest trees; buried seeds; viability; seed productivity; seed dormancy; plant density; tree mortality; North Carolina; Appalachian region
Abstract:
... Seed dormancy is assumed to be unimportant for population dynamics of temperate woody species, because seeds occur at low densities and are short lived in forest soils. However, low soil seed densities may result from low seed production, and even modest seed longevity can buffer against fluctuating seed production, potentially limiting density‐dependent mortality and ensuring that seeds are avail ...
DOI:
10.1890/03-0685

14. Land use, primary productivity, and lake area as descriptors of zooplankton diversity

Author:
Hoffmann, Michael D.; Dodson, Stanley I.
Source:
Ecology 2005 v.86 no.1 pp. 255-261
ISSN:
0012-9658
Subject:
lakes; zooplankton; species diversity; mathematical models
Abstract:
... Two major ecological generalizations are that species richness increases monotonically with habitat size and that it is often a unimodal function of primary productivity. We performed a meta‐analysis to test hypotheses that, in 41 well‐studied lakes of the world, these patterns are an artifact of combining data from pristine and developed lakes. The monotonic species–area relationship was found in ...
DOI:
10.1890/03-0833

15. Nitrogen retention across a gradient of 15n additions to an unpolluted temperate forest soil in chile

Author:
Perakis, Steven S.; Compton, Jana E.; Hedin, Lars O.
Source:
Ecology 2005 v.86 no.1 pp. 96-105
ISSN:
0012-9658
Subject:
temperate forests; old-growth forests; forest soils; nitrogen fertilizers; soil nutrient balance; soil nutrient dynamics; nitrification; Chile
Abstract:
... Accelerated nitrogen (N) inputs can drive nonlinear changes in N cycling, retention, and loss in forest ecosystems. Nitrogen processing in soils is critical to understanding these changes, since soils typically are the largest N sink in forests. To elucidate soil mechanisms that underlie shifts in N cycling across a wide gradient of N supply, we added ¹⁵NH₄ ¹⁵NO₃ at nine treatment levels ranging i ...
DOI:
10.1890/04-0415

16. Novel plant secondary metabolites impact dietary specialists more than generalists (neotoma spp)

Author:
Sorensen, Jennifer S.; McLister, James D.; Dearing, M. Denise
Source:
Ecology 2005 v.86 no.1 pp. 140-154
ISSN:
0012-9658
Subject:
secondary metabolites; Larrea tridentata; phenolic compounds; mammals; rats; Juniperus; herbivores; food intake; energy balance; energy metabolism; animal physiology
Abstract:
... Theory predicts that dietary specialization is limited in part because of physiological trade‐offs associated with specialization. Specifically, dietary specialists are predicted to evolve mechanisms that reduce costs and enhance excretion of plant secondary metabolites (PSMs) that they frequently consume, but are less energetically and/or mechanistically efficient at eliminating novel PSMs. Altho ...
DOI:
10.1890/03-0669

17. Plant secondary metabolites compromise the energy budgets of specialist and generalist mammalian herbivores

Author:
Sorensen, Jennifer S.; McLister, James D.; Dearing, M. Denise
Source:
Ecology 2005 v.86 no.1 pp. 125-139
ISSN:
0012-9658
Subject:
secondary metabolites; herbivores; mammals; rats; digestible energy; energy metabolism; energy balance; food intake; excretion
Abstract:
... Ingestion of plant secondary metabolites (PSMs) presents a physiological and behavioral challenge for mammalian herbivores. Herbivores must not only detoxify PSMs, but they may also deal with energetic constraints such as reduced food intake, mass loss, increased excretion of energy, and increased metabolic demands. We hypothesized that the energetic consequences of consuming PSMs will significant ...
DOI:
10.1890/03-0627

18. Rarity, fragmentation, and the scale dependence of extinction risk in desert fishes

Author:
Fagan, William F.; Aumann, Craig; Kennedy, Christina M.; Unmack, Peter J.
Source:
Ecology 2005 v.86 no.1 pp. 34-41
ISSN:
0012-9658
Subject:
deserts; freshwater fish; extinction; risk assessment; habitat fragmentation; databases; Sonoran Desert
Abstract:
... Attributes of a species' spatial distribution, such as the number of occurrences and the spatial distribution of those occurrences, can affect extinction risk. Extinction risk, however, is scale dependent, and it is unclear how scale dependency affects linkages between species' distributions and extinction risk. Here, we evaluate the relationships between number of occurrences, distributional frag ...
DOI:
10.1890/04-0491

19. Resorption proficiency along a chronosequence: responses among communities and within species

Author:
Richardson, Sarah J.; Peltzer, Duane A.; Allen, Robert B.; McGlone, Matt S.
Source:
Ecology 2005 v.86 no.1 pp. 20-25
ISSN:
0012-9658
Subject:
nitrogen; phosphorus; soil nutrients; nutrient availability; resorption; chronosequences; soil fertility; leaves; forest litter; forest trees; tree ferns; conifers; Magnoliophyta; New Zealand
Abstract:
... Soil nitrogen and phosphorus pools shift strongly along soil chronosequences worldwide, but variation in plant nutrient resorption along these sequences is poorly understood. We quantified leaf and litter nutrient concentrations in 28 woody species along the Franz Josef soil chronosequence, New Zealand, a strong fertility gradient in temperate rain forest, to address two questions: How do leaf and ...
DOI:
10.1890/04-0524

20. Restitution of mass–size residuals: validating body condition indices

Author:
Schulte-Hostedde, Albrecht I.; Zinner, Bertram; Millar, John S.; Hickling, Graham J.
Source:
Ecology 2005 v.86 no.1 pp. 155-163
ISSN:
0012-9658
Subject:
small mammals; body condition; body size; regression analysis; body mass index; Alberta
Abstract:
... Body condition can have important fitness consequences, but measuring body condition of live animals from wild populations has been the subject of much recent debate. Using the residuals from a regression of body mass on a linear measure of body size is one of the most common methods of measuring condition and has been used in many vertebrate taxa. Recently, the use of this method has been critici ...
DOI:
10.1890/04-0232