![Islands as an Invasion Pathway for the Rusty Crayfish, Orconectes](http://s1.studyres.com/store/data/014589150_1-52facadd082ed80962a082d5b403ba7a-300x300.png)
Islands as an Invasion Pathway for the Rusty Crayfish, Orconectes
... especially true for chelae size. Large chelae are advantageous in agonistic encounters, defense against predators, and during reproduction (Garvey and Stein, 1993). These appendages require a large input of energy to grow, but are very beneficial. Large chelae allow for dominance over smaller crayfi ...
... especially true for chelae size. Large chelae are advantageous in agonistic encounters, defense against predators, and during reproduction (Garvey and Stein, 1993). These appendages require a large input of energy to grow, but are very beneficial. Large chelae allow for dominance over smaller crayfi ...
Natural and human-induced dynamics in plant–animal mutualistic
... mutualisms, which means that animals collect a certain type of rewarding resource offered by plants (Holland & DeAngelis 2010). In many cases these resources represent food items (e.g., fruit pulp, pollen, or nectar; Bascompte & Jordano 2013). The mutualistic service provided by animals, in turn, is ...
... mutualisms, which means that animals collect a certain type of rewarding resource offered by plants (Holland & DeAngelis 2010). In many cases these resources represent food items (e.g., fruit pulp, pollen, or nectar; Bascompte & Jordano 2013). The mutualistic service provided by animals, in turn, is ...
i THE EVOLUTION OF SPECIES’ GEOGRAPHICAL RANGE LIMITS:
... in these new regions. One explanation is that small, marginal populations are prone to genetic drift and lack the genetic variability required to persist in new habitats beyond the edge (Antonovics 1976). Alternatively, if marginal populations are not geographically isolated, gene flow from more abu ...
... in these new regions. One explanation is that small, marginal populations are prone to genetic drift and lack the genetic variability required to persist in new habitats beyond the edge (Antonovics 1976). Alternatively, if marginal populations are not geographically isolated, gene flow from more abu ...
SPECIES-AREA RELATIONSHIPS OF CLIFF SYSTEM
... range in boreal forests, is a classic example that utilizes cliff faces as a retreat from more competitively dominant species, especially in its southern, disjunct range (Walker 1987, ...
... range in boreal forests, is a classic example that utilizes cliff faces as a retreat from more competitively dominant species, especially in its southern, disjunct range (Walker 1987, ...
Chapter 8 Arthropods: Harvestmen - Bryophyte Ecology
... These long-legged arachnids are variously known as daddy-long-legs, granddaddy-long-legs, and harvestmen (Figure 1). The name harvestmen most likely derives from their peak abundance around harvest time. They live on every continent but Antarctica. The adults are usually too big to live within the m ...
... These long-legged arachnids are variously known as daddy-long-legs, granddaddy-long-legs, and harvestmen (Figure 1). The name harvestmen most likely derives from their peak abundance around harvest time. They live on every continent but Antarctica. The adults are usually too big to live within the m ...
Biodiversity and ecosystem services: does species diversity
... activities to a position of nature in the centre of society, where ecosystems provide services for society representing the utility factor of nature: our natural capital. Examples of this changing position of nature in society are for instance the recent Governmental report on nature and society: ‘A ...
... activities to a position of nature in the centre of society, where ecosystems provide services for society representing the utility factor of nature: our natural capital. Examples of this changing position of nature in society are for instance the recent Governmental report on nature and society: ‘A ...
How do bryophytes govern generative recruitment of vascular plants?
... • The mechanisms underpinning the effects of bryophytes on vascular plant recruitment include phenolic leakages that inhibit germination, mechanical obstruction that prevents seeds from reaching the soil and alters the light regime, alteration of the soil microclimate (moisture and temperature regim ...
... • The mechanisms underpinning the effects of bryophytes on vascular plant recruitment include phenolic leakages that inhibit germination, mechanical obstruction that prevents seeds from reaching the soil and alters the light regime, alteration of the soil microclimate (moisture and temperature regim ...
ECOHAB Preface The Ecology and Oceanography of Harmful Algal Blooms
... scattered locations, but now virtually every coastal state is threatened, in many cases over large geographic areas and by more than one harmful or toxic species. It is still a matter of debate as to the causes behind this expansion, with possible explanations ranging from natural mechanisms of spec ...
... scattered locations, but now virtually every coastal state is threatened, in many cases over large geographic areas and by more than one harmful or toxic species. It is still a matter of debate as to the causes behind this expansion, with possible explanations ranging from natural mechanisms of spec ...
30 years of the endangered species act
... 200 to 300 Aleutian geese. Buldir was Many private landowners on the Califorone of few remaining islands with no nia coast and in the Sacramento and San foxes and a remnant goose population. Joaquin valleys manage their lands to So serious was the plight of the subspe- provide wintering habitat for ...
... 200 to 300 Aleutian geese. Buldir was Many private landowners on the Califorone of few remaining islands with no nia coast and in the Sacramento and San foxes and a remnant goose population. Joaquin valleys manage their lands to So serious was the plight of the subspe- provide wintering habitat for ...
American Mink (Mustela vison) and its impact on native species in
... Bullock 2000). Many of the species introduced to the UK have become well established and there have been targeted efforts to eliminate these introduced species, some successful but most un-successful (Manchester & Bullock 2000). One of the most well known of these is the extermination of the Coypu ( ...
... Bullock 2000). Many of the species introduced to the UK have become well established and there have been targeted efforts to eliminate these introduced species, some successful but most un-successful (Manchester & Bullock 2000). One of the most well known of these is the extermination of the Coypu ( ...
Predictable evolution toward flightlessness in volant
... reflecting evolution toward a generalist niche in species-poor communities (4–8). The tendency for island taxa to converge toward intermediate body size after colonizing islands is known as the island rule (4), but this ecogeographic rule has proven to be an inconsistent predictor of evolutionary tr ...
... reflecting evolution toward a generalist niche in species-poor communities (4–8). The tendency for island taxa to converge toward intermediate body size after colonizing islands is known as the island rule (4), but this ecogeographic rule has proven to be an inconsistent predictor of evolutionary tr ...
7. Annex 2 – Review of Theoretical Community Ecology
... Knowing that the mean size of fish in the assemblage has decreased provides little or no information about changes in the biodiversity of the fish assemblage; neither does it help managers to set biodiversity objectives or identify appropriate measures to achieve these. In order to address questions ...
... Knowing that the mean size of fish in the assemblage has decreased provides little or no information about changes in the biodiversity of the fish assemblage; neither does it help managers to set biodiversity objectives or identify appropriate measures to achieve these. In order to address questions ...
The impact of herbicides on weed abundance and biodiversity PN0940
... In considering non-target plants within arable fields, the majority of plant species that are found are of only minor concern to farmers, unless present at high population density. Under horticultural conditions, it can be argued that all weeds are targets, providing some difficulty for formal risk ...
... In considering non-target plants within arable fields, the majority of plant species that are found are of only minor concern to farmers, unless present at high population density. Under horticultural conditions, it can be argued that all weeds are targets, providing some difficulty for formal risk ...
1. UNDERSTANDING PONDS - Freshwater Habitats Trust
... There are around 80 pond-associated Priority species in England alone, and additional species in Scotland, Wales and Northern Ireland. You can find out which pond-associated Priority plants and animals occur near you by using the Species Mapping tool on our website: http://freshwaterhabitats.org.uk/ ...
... There are around 80 pond-associated Priority species in England alone, and additional species in Scotland, Wales and Northern Ireland. You can find out which pond-associated Priority plants and animals occur near you by using the Species Mapping tool on our website: http://freshwaterhabitats.org.uk/ ...
Assessing the impact of introduced cats on island biodiversity by
... This study was carried out on Corvo (39°40’ N, 31°07’ W; Atlantic Ocean), a small oceanic island (17 km2; 0–718 m above sea level) that is primarily used for cattle grazing. The island is covered by pastures, one small village, some arable land, a few small fragments of forest and extensive rocky cl ...
... This study was carried out on Corvo (39°40’ N, 31°07’ W; Atlantic Ocean), a small oceanic island (17 km2; 0–718 m above sea level) that is primarily used for cattle grazing. The island is covered by pastures, one small village, some arable land, a few small fragments of forest and extensive rocky cl ...
Field identification guide to Heard Island and McDonald
... invertebrate surveys over the past seven years have now revealed more than 500 species, many of which are endemic. This is an essential reference guide to these species. Illustrated with hundreds of representative photographs, it includes brief narratives on the biology and ecology of the major taxo ...
... invertebrate surveys over the past seven years have now revealed more than 500 species, many of which are endemic. This is an essential reference guide to these species. Illustrated with hundreds of representative photographs, it includes brief narratives on the biology and ecology of the major taxo ...
Adaptive management of temperate reefs to minimise effects
... We would like to thank a range of organisations and people for their contributions to this research. Firstly we thank FRDC and the Department of Climate Change and Energy Efficiency (DCCEE) for the grant that under-pinned this research as well as other funding agencies that supported a range of coll ...
... We would like to thank a range of organisations and people for their contributions to this research. Firstly we thank FRDC and the Department of Climate Change and Energy Efficiency (DCCEE) for the grant that under-pinned this research as well as other funding agencies that supported a range of coll ...
BEHAVIOURAL PLASTICITY OF LIFE HISTORY TRAITS IN THE NEW ZEALAND AVIFAUNA
... Mammals were not the only introduced animals to New Zealand; Europeans also brought many different bird species as well (Gill & Martinson 1991). In contrast to native New Zealand birds, European birds did evolve with mammalian predators and high predation rates. As a result the European birds have f ...
... Mammals were not the only introduced animals to New Zealand; Europeans also brought many different bird species as well (Gill & Martinson 1991). In contrast to native New Zealand birds, European birds did evolve with mammalian predators and high predation rates. As a result the European birds have f ...
View plan for Ekahanui Management Unit
... Currently, there are no ICAs designated for Ekahanui MU. The table below summarizes incipient invasive taxa at Ekahanui. Appendix 3.1 of the MIP lists significant alien species and ranks their potential invasiveness and distribution. Each species was given a weed management code: 0 = not reported fr ...
... Currently, there are no ICAs designated for Ekahanui MU. The table below summarizes incipient invasive taxa at Ekahanui. Appendix 3.1 of the MIP lists significant alien species and ranks their potential invasiveness and distribution. Each species was given a weed management code: 0 = not reported fr ...
Pollination in New Zealand
... hand, unmanaged non-native species are derived from stock either deliberately imported for agriculture or that arrived by accident (Donovan 2007). Imported pollinators often escape to live freely in the wild, thus becoming part of unmanaged pollinator assemblages; when these domesticated species nat ...
... hand, unmanaged non-native species are derived from stock either deliberately imported for agriculture or that arrived by accident (Donovan 2007). Imported pollinators often escape to live freely in the wild, thus becoming part of unmanaged pollinator assemblages; when these domesticated species nat ...
Eleutherodactylus coqui Thomas (Caribbean tree frog)
... species endemic to the island, but the coqui is the most widespread and abundant. While larger than most other frogs in Puerto Rico, the coqui is a small frog (maximum snout–vent length (SVL) for males of 50mm and for females of 63mm; Joglar, 1998), that differentiates itself from other Eleutherodac ...
... species endemic to the island, but the coqui is the most widespread and abundant. While larger than most other frogs in Puerto Rico, the coqui is a small frog (maximum snout–vent length (SVL) for males of 50mm and for females of 63mm; Joglar, 1998), that differentiates itself from other Eleutherodac ...
Effect of Argentine ant invasions on ground
... ®eld studies, they also yield general and realistic results (Diamond 1986). Although natural experiments have shortcomings (Diamond 1986; Underwood 1990), they may be the best way to assess the eects of widespread invasions. In this study, an ongoing invasion is used to assess the changes occurring ...
... ®eld studies, they also yield general and realistic results (Diamond 1986). Although natural experiments have shortcomings (Diamond 1986; Underwood 1990), they may be the best way to assess the eects of widespread invasions. In this study, an ongoing invasion is used to assess the changes occurring ...
- NDLScholarship
... endangered wildlife and plants because we lack the resources and the will to do so. They further contend that continued allegiance to the Noah Principle prevents a real discussion of the choices we must make. Mann and Plummer thus propose an alternative system that would allow society to choose betw ...
... endangered wildlife and plants because we lack the resources and the will to do so. They further contend that continued allegiance to the Noah Principle prevents a real discussion of the choices we must make. Mann and Plummer thus propose an alternative system that would allow society to choose betw ...
Environmental Science Chapter 8 Revision
... 64. Zebra mussels were accidentally imported to the Great Lakes from Europe in the 1980s. (They were stowaways on cargo ships.) These small mollusks have no natural enemies in the United States. Zebra mussels multiply quickly and attach themselves permanently to anything—fish, boats, rocks, pipes, ...
... 64. Zebra mussels were accidentally imported to the Great Lakes from Europe in the 1980s. (They were stowaways on cargo ships.) These small mollusks have no natural enemies in the United States. Zebra mussels multiply quickly and attach themselves permanently to anything—fish, boats, rocks, pipes, ...
Ecological processes responsible for species co
... I examined the interactions of P. cinereus and P. electromorphus through a variety of methods to better understand how the interactions between these two species lead to their distributions in Ohio. I found that in sympatry, both species were more aggressive towards individuals of the other species ...
... I examined the interactions of P. cinereus and P. electromorphus through a variety of methods to better understand how the interactions between these two species lead to their distributions in Ohio. I found that in sympatry, both species were more aggressive towards individuals of the other species ...
Introduced species
![](https://commons.wikimedia.org/wiki/Special:FilePath/Melilotus_alba_bgiu.jpg?width=300)
An introduced, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its native distributional range, which has arrived there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are called invasive species. Some have a negative effect on a local ecosystem. Some introduced species may have no negative effect or only minor impact. Some species have been introduced intentionally to combat pests. They are called biocontrols and may be regarded as beneficial as an alternative to pesticides in agriculture for example. In some instances the potential for being beneficial or detrimental in the long run remains unknown. A list of some introduced species is given in a separate article.The effects of introduced species on natural environments have gained much scrutiny from scientists, governments, farmers and others.