Abstract:
:The Alexander Archipelago wolf (Canis lupus ligoni) is unique to southeast Alaska, occurring on islands south of Frederick Sound and along the mainland between Dixon Entrance and Yakutat Bay. Sitka black-tailed deer (Odocoileus hemionus sitkensis) are an important prey species for wolves across the southern part of the region. Spawning salmon (Onchorynchus sp.) are seasonally available but their presence in wolf diets has not previously been quantified. We examined the range of bone collagen δ13C and δ15N values for wolves throughout southeast (n = 163) and interior (n = 50) Alaska and used a dual-isotope mixing model to determine the relative contribution of salmon-derived marine protein in the diet. Southeast Alaska wolves consumed significantly more salmon (mean ± SE: 18.3 ± 1.2%) than did wolves from interior Alaska (9.1 ± 0.6%, P<0.001). Wolves on the southeast Alaska mainland appeared to have higher marine isotopic signatures than island wolves, although this difference was not significant. Variation among individual wolf diets was higher for southeast than for interior Alaska wolves, and variation was highest in coastal mainland wolf diets (P<0.001). Marine resources may augment the diet of southeast Alaska wolves during seasonal or annual fluctuations in the availability of deer, particularly in those areas on the mainland where densities of terrestrial ungulates are relatively low.
journal_name
Oecologiajournal_title
Oecologiaauthors
Szepanski MM,Ben-David M,Van Ballenberghe Vdoi
10.1007/s004420050866subject
Has Abstractpub_date
1999-08-01 00:00:00pages
327-335issue
3eissn
0029-8549issn
1432-1939pii
10.1007/s004420050866journal_volume
120pub_type
杂志文章相关文献
OECOLOGIA文献大全abstract::The remains of northern fur seals (Callorhinus ursinus) are among the most abundant of pinniped elements recovered from mainland coastal archaeological sites in both California and Oregon. This is surprising as all contemporary northern fur seals breed exclusively on offshore islands, primarily at high latitudes, and ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420100631
更新日期:2001-06-01 00:00:00
abstract::The mycobiont of the high-light-susceptible forest lichen Lobaria pulmonaria was shown to deposit brown, melanic compounds in the outer layer of the upper cortex, depending on the long-term level of solar radiation in its natural habitat. Furthermore, pale thalli from a shady habitat produced melanic compounds after t...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420000541
更新日期:2001-02-01 00:00:00
abstract::This study links summer foraging and scatter-hoarding to winter larder-hoarding and winter survival in yellow pine chipmunks (Tamias amoenus) by comparing patterns of time allocation and winter larder contents in 2 years with very different levels of resource availability. In 2003, seed production and the number of tr...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-008-1072-4
更新日期:2008-08-01 00:00:00
abstract::Agricultural land use is a leading cause of habitat degradation, leaving a legacy of ecological impacts long after agriculture has ceased. Yet the mechanisms for legacy effects, such as altered plant community composition, are not well understood. In particular, whether plant community recovery is limited by an inabil...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-019-04348-6
更新日期:2019-04-01 00:00:00
abstract::The presence of spines on woody plants has been shown to limit the loss of foliage to large mammalian browsers by restricting both bite size and biting rate. We tested the hypothesis that plant spines are also an effective defense against browsing by small mammals, such as rodents, that climb within the canopy of shru...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050371
更新日期:1998-01-01 00:00:00
abstract::Most models of parental investment in offspring assume a trade-off between propagule size and number, and an increasing "concave down" function relating offspring fitness to propagule size. In this study, we test these two fundamental assumptions, using three closely related species of crickets, Gryllus firmus, G. vel...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00329806
更新日期:1995-06-01 00:00:00
abstract::Species-habitat relationships are an important aspect of fish life history, particularly in early ontogeny. To address the lack of information on the microhabitat use/requirements of European coarse fishes, particularly 0-group fishes in riverine systems, an empirical model was generated from data collected in the Riv...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00317621
更新日期:1992-09-01 00:00:00
abstract::Anthropogenic nitrogen deposition and projected increases in rainfall variability (the frequency of drought and heavy rainfall events) are expected to strongly influence ecosystem processes such as litter decomposition. However, how these two global change factors interact to influence litter decomposition is largely ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-015-3396-1
更新日期:2016-03-01 00:00:00
abstract::We reared larvae of three generalist insect species on plants occurring in their habitats. Individuals of each species were kept either on mixed diets, or on each plant species separately. We measured food plant preference in the mixed-diet group and compared insect performance on single plants to the performance on t...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s004420050815
更新日期:1999-06-01 00:00:00
abstract::Natural regeneration of abandoned farmland provides an important opportunity to contribute to global reforestation targets, including the Bonn Challenge. Of particular importance are the montane tropics, where a long history of farming, frequently on marginal soils, has rendered many ecosystems highly degraded and hot...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-019-04497-8
更新日期:2019-10-01 00:00:00
abstract::The use of the landscape by animals is predicted to be a function of their body size. However, empirical data relating these two variables from an array of body sizes within a single mammalian community are scarce. We tested this prediction by assessing landscape use of mammals by analyzing strontium (Sr) isotope sign...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-007-0779-y
更新日期:2007-10-01 00:00:00
abstract::The impacts of disturbance on biodiversity and distributions have been studied in many systems. Yet, comparatively less is known about how lichens-obligate symbiotic organisms-respond to disturbance. Successful establishment and development of lichens require a minimum of two compatible yet usually unrelated species t...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-019-04413-0
更新日期:2019-06-01 00:00:00
abstract::The palatability of 14 species of woody plant was assessed for three species of browsing ruminant, namely kudus, impalas and goats. Results show that palatability was most clearly related to leaf contents of condensed tannins. The effect was a threshold one, with all plants containing more than 5% condensed tannins be...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00378466
更新日期:1985-08-01 00:00:00
abstract::Human disturbances to ecosystems have created challenges to populations worldwide, forcing them to respond phenotypically in ways that increase their fitness under current conditions. One approach to examining population responses to disturbance in species with complex life histories is to study species that exhibit s...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-012-2564-9
更新日期:2013-08-01 00:00:00
abstract::The identification of potential competitors has been driven by the concept of limiting similarity. Lacking are explicit tests of interaction strength among morphologically similar and dissimilar species. I used the mottled sculpin, Cottus bairdi, as a focal species in an artificial stream experiment designed to compar...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00365559
更新日期:1995-09-01 00:00:00
abstract::We investigated in the field the carbon (C) transfer between sugar maple (Acer saccharum) saplings and the spring ephemeral Erythronium americanum via the mycelium of arbuscular mycorrhizal (AM) fungi. Sugar maple saplings and E. americanum plants were planted together in pots placed in the ground of a maple forest in...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-002-0958-9
更新日期:2002-07-01 00:00:00
abstract::We examined how independent and interactive effects of CO2 concentrations, water supply and wind speed affect growth rates, biomass partitioning, water use efficiency, diffusive conductance and stomatal density of plants. To test the prediction that wind stress will be ameliorated by increased CO2 and/or by unrestrict...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00317118
更新日期:1993-06-01 00:00:00
abstract::The promise of "trait-based" plant ecology is one of generalized prediction across organizational and spatial scales, independent of taxonomy. This promise is a major reason for the increased popularity of this approach. Here, we argue that some important foundational assumptions of trait-based ecology have not receiv...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-016-3549-x
更新日期:2016-04-01 00:00:00
abstract::Data from the US/IBP Desert Biome validation studies indicate that above-ground production and biomass allocated to reproduction in Larrea tridentata vary from one year to another depending upon the timing and extent of soil-moisture availability. In an attempt to verify these observations and determine to what extent...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00347929
更新日期:1979-01-01 00:00:00
abstract::Phenolics in marine brown algae have been thought to follow a latitudinal gradient with high phenolic species in high latitudes and low phenolic species in low latitudes. However, tropical brown algae from the western Caribbean have been shown to be high in phlorotannin concentration, indicating that latitude alone is...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00329077
更新日期:1995-08-01 00:00:00
abstract::The reproductive behaviour of the toad Bufo calamita was studied in a large population in the northern Rhineland, Germany. Toads bred at four spatially separated but neighbouring areas including 34 breeding ponds. Three methods were applied to monitor quantitatively the intensity of breeding and migratory activity: ca...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00377035
更新日期:1988-08-01 00:00:00
abstract::By altering the strength of intra- and interspecific competition, droughts may reshape plant communities. Furthermore, species may respond differently to drought when other influences, such as herbivory, are considered. To explore this relationship, we conducted a greenhouse experiment measuring responses to inter- an...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-016-3582-9
更新日期:2016-06-01 00:00:00
abstract::Desert populations of the evergreen dioecious shrub Simmondsia chinensis exhibit sex-related leaf and canopy dimorphisms not present in populations from more mesic coastal environments. Leaves on female shrubs have characteristically larger sizes, greater specific weights, and greater water-holding capacity than male ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/BF00346394
更新日期:1979-12-01 00:00:00
abstract::The life history of freshwater cladocerans such as Daphnia spp. is strongly affected by their environment. Factors such as temperature, food quantity and even the presence or absence of predators influence growth, reproduction and morphology of individuals. Recently, it has also become clear that the quality of the fo...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-009-1452-4
更新日期:2010-02-01 00:00:00
abstract::Animal-pollinated plants can be susceptible to changes in pollinator availability. Honeydew-producing treehoppers frequently occur on inflorescences, potentially enhancing ant-mediated negative effects on pollination services. However, the effect of ant-attended, honeydew-producing insects on plant reproduction remain...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-017-4045-7
更新日期:2018-03-01 00:00:00
abstract::Our understanding of the response of vascular, terrestrial plants to nitrogen (N) addition is advanced and provides the foundation for modern agriculture. In comparison, information on responses of marine macroalgae to increased nitrogen is far less developed. We investigated how in situ pulses of nitrate (NO3 (-)) af...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-016-3641-2
更新日期:2016-09-01 00:00:00
abstract::Plants often recruit frugivorous animals to transport their seeds; however, gut passage can have varying effects on plant fitness depending on the physical and chemical treatment of the seed, the distance seeds are transported, and the specific site of deposition. One way in which plants can mediate the effects of gut...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-014-3096-2
更新日期:2015-02-01 00:00:00
abstract::One hypothesis for amphibian declines is that increased dryness attributed to global climate change exposes amphibians to greater biotic threat and, consequently, greater mortality. But, little is known about behavioral responses of terrestrial amphibians to dry conditions alone or in combination with biotic threats. ...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-003-1206-7
更新日期:2003-05-01 00:00:00
abstract::The population dynamics of Antarctic seabirds are influenced by variations in winter sea ice extent and persistence; however, the type of relationship differs according to the region and the demographic parameter considered. We used annual presence/absence data obtained from 1,138 individually marked birds to study th...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-009-1387-9
更新日期:2009-08-01 00:00:00
abstract::Seed dispersal by ants (myrmecochory) is mediated by the presence of a lipid-rich appendage (elaiosome) on the seed that induces a variety of ants to collect the diaspores. When seeds mature or fall onto the ground, these ant species transport them to their nest. After eating the elaiosome, the seed is discarded in ne...
journal_title:Oecologia
pub_type: 杂志文章
doi:10.1007/s00442-005-0200-7
更新日期:2005-12-01 00:00:00