scholarly journals Stream community richness predicts apex predator occupancy dynamics in riparian systems

Oikos ◽  
2018 ◽  
Vol 127 (10) ◽  
pp. 1422-1436 ◽  
Author(s):  
Angela M. Holland ◽  
Eric M. Schauber ◽  
Clayton K. Nielsen ◽  
Eric C. Hellgren
Keyword(s):  
Apex Predator ◽  
Occupancy Dynamics ◽  
Stream Community ◽  
Riparian Systems

scholarly journals River otter and mink occupancy dynamics in riparian systems

2019 ◽  
Vol 83 (7) ◽  
pp. 1552-1564 ◽  
Author(s):  
Angela M. Holland ◽  
Eric M. Schauber ◽  
Clayton K. Nielsen ◽  
Eric C. Hellgren
Keyword(s):  
River Otter ◽  
Occupancy Dynamics ◽  
Riparian Systems

scholarly journals Occupancy dynamics of semi‐aquatic herbivores in riparian systems in Illinois, USA

Ecosphere ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. e02614 ◽  
Author(s):  
Angela M. Holland ◽  
Eric M. Schauber ◽  
Clayton K. Nielsen ◽  
Eric C. Hellgren
Keyword(s):  
Occupancy Dynamics ◽  
Riparian Systems

An Experimental Analysis of Biological Factors Contributing to Stream Community Structure

Ecology ◽  
1980 ◽  
Vol 61 (6) ◽  
pp. 1283-1290 ◽  
Author(s):  
Barbara L. Peckarsky ◽  
Stanley I. Dodson
Keyword(s):  
Community Structure ◽  
Experimental Analysis ◽  
Biological Factors ◽  
Stream Community

scholarly journals Biology of an Adventive Population of the Armored Scale Rhizaspidiotus donacis, a Biological Control Agent of Arundo donax in California

Insects ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 588
Author(s):  
Charles A. Braman ◽  
Adam M. Lambert ◽  
A. Zeynep Özsoy ◽  
Ellen N. Hollstien ◽  
Kirsten A. Sheehy ◽  
...  
Keyword(s):  
Biological Control ◽  
Biological Control Agent ◽  
Control Agent ◽  
Arundo Donax ◽  
Giant Reed ◽  
Aphytis Melinus ◽  
Adult Females ◽  
Armored Scale ◽  
Riparian Systems

Arundo donax (giant reed) is invasive in Mediterranean, sub-, and tropical riparian systems worldwide. The armored scale Rhizaspidiotus donacis is approved for biocontrol in North America, but an adventive population was recently discovered in southern California. We documented this population’s distribution, phylogeny, phenology, potential host spillover to Phragmites spp., and potential for parasitism by a common biocontrol parasitoid of citrus scale. The adventive scale was found within a single watershed and is genetically closest to Iberian scale genotypes. Rhizaspidiotus donacis developed on Phragmites haplotypes but at much lower densities than Arundo. The adventive population is univoltine, producing crawlers from March-June. Aphytis melinus parasitoids exhibited sustained interest in R. donacis during choice and no-choice trials and oviposition resulted in a small second generation. Rhizaspidiotus donacis appears limited in distribution by its univoltinism and sessile adult females. This presents challenges for broad biocontrol implementation but allows for targeted application. The genetic differentiation between imported biocontrol samples and adventive populations presents an opportunity for exploring benefits of hybrids and/or alternative genotypes where establishment has been difficult. While unlikely to occur in situ, spillover to vulnerable endemic Phragmites or deleterious parasitoid effects on scale biocontrol agents warrants consideration when planning use of R. donacis.

scholarly journals Dhole pack size variation: Assessing the effect of Prey availability and Apex predator

2021 ◽  
Author(s):  
Aishwarya Bhandari ◽  
Pallavi Ghaskadbi ◽  
Parag Nigam ◽  
Bilal Habib
Keyword(s):  
Prey Availability ◽  
Size Variation ◽  
Apex Predator ◽  
Pack Size

scholarly journals Landscape heterogeneity and the biodiversity of Arctic stream communities: a habitat template analysis

2005 ◽  
Vol 62 (8) ◽  
pp. 1905-1919 ◽  
Author(s):  
Alexander D Huryn ◽  
Karie A Slavik ◽  
Rex L Lowe ◽  
Stephanie M Parker ◽  
Dennis S Anderson ◽  
...  
Keyword(s):  
Landscape Heterogeneity ◽  
Detrended Correspondence Analysis ◽  
Functional Feeding Groups ◽  
Mountain Glacier ◽  
Stream Communities ◽  
Stream Community ◽  
Arctic Alaska ◽  
Template Analysis ◽  
Habitat Template ◽  
And Function

We predicted that substratum freezing and instability are major determinants of the variability of stream community structure in Arctic Alaska. Their effects were conceptualized as a two-dimensional habitat template that was assessed using a natural experiment based on five stream types (mountain-spring, tundra-spring, tundra, mountain, glacier). Detrended correspondence analysis (DCA) indicated distinct macroinvertebrate assemblages for each stream type. The contribution of functional feeding groups to assemblage biomass varied systematically among stream types, indicating that structure and function are linked. Assemblage position within a DCA biplot was used to assess factors controlling its structure. Springs separated from other stream types along a gradient of nutrient concentration and freezing probability. Glacier and mountain streams separated from springs and tundra streams along a gradient of substratum instability and freezing probability. Owing to differences in sources of discharge to streams, the effects of nutrients and substratum stability could not be separated from freezing. Although many factors likely contribute to the variability of Arctic stream communities, the major determinants may be conceptualized as a template structured by gradients in (i) nutrient supply and substratum freezing and (ii) substratum instability and substratum freezing. This template provides a basis for predicting the response of Arctic stream communities to climate change.

First wolves in Luxembourg since 1893, originating from the Alpine and Central European populations

Mammalia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Laurent Schley ◽  
Marianne Jacobs ◽  
Sebastian Collet ◽  
Alexander Kristiansen ◽  
Jan Herr
Keyword(s):  
Canis Lupus ◽  
Dna Analysis ◽  
Carcass Characteristics ◽  
Management Plan ◽  
Apex Predator ◽  
Grey Wolf ◽  
Melting Pot ◽  
Central European ◽  
The Past ◽  
Hard Evidence

Abstract Considering the spread of the grey wolf (Canis lupus) in Europe over the past 30 years, Luxembourg took some measures to prepare for the return of this apex predator, including the establishment of a management plan that notably addresses the issue of wolf depredation on livestock. Here we present the results of genetic analyses of putative wolf saliva, hair and scat samples collected from or near prey carcasses between 2015 and 2020. In two cases, the wolf was confirmed via DNA analysis: in July 2017 near Garnich and in April 2020 near Niederanven, both assigned to category C1 (hard evidence). A third case was classified as C2 (confirmed observation) based on prey carcass characteristics, while genetic analysis yielded no result. These are the first confirmed records of wolves in Luxemburg since 1893. Moreover, the two C1-cases originated from the Alpine (Garnich) and Central European (Niederanven) populations. Given similar developments in the neighboring countries and regions, we conclude that the area including the Benelux countries as well as Rhineland-Palatinate, Saarland and Northern France may well become a melting pot for wolves of the two aforementioned populations in the coming years and decades.

scholarly journals Resource selection in an apex predator and variation in response to local landscape characteristics

2018 ◽  
Vol 228 ◽  
pp. 233-240 ◽  
Author(s):  
R.G. Morato ◽  
G.M. Connette ◽  
J.A. Stabach ◽  
R.C. De Paula ◽  
K.M.P.M. Ferraz ◽  
...  
Keyword(s):  
Resource Selection ◽  
Apex Predator ◽  
Landscape Characteristics
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