Climatic drivers and ecological impacts of a rapid range expansion by non-native smallmouth bass

AbstractThis is the first report of the hairy maggot blow fly, Chrysomya rufifacies (Macquart), in Canada since its arrival in the continental United States of America in 1982. Specimens were collected from one swine (Sus scrofa L.) carcass in fall 2004 and again from six swine carcasses at three rural sites within the Windsor/Essex County region of southwestern Ontario in fall 2005. Based upon the biological characteristics of the species and the absence of specimens from spring and summer carrion-insect collections, it is suggested that C. rufifacies is present in southwestern Ontario during the fall season, after range expansion from the midcontinental United States of America during the spring and summer months. However, considering the projected increases in temperature due to global warming, establishment of C. rufifacies is predicted to extend well into southern Ontario and Quebec. Current and predicted distributions based upon the biological temperature requirements of C. rufifacies are depicted through geographic range maps. The potential economic and ecological impacts are discussed, with emphasis upon negative interactions between C. rufifacies and several native blow fly species, particularly Cochliomyia macellaria (Fabr.).

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Gametogenesis of an intertidal population of Mytilus trossulus in NW Greenland: not a limitation for potential Arctic range expansion

Marine Ecology Progress Series ◽

10.3354/meps12179 ◽

2017 ◽

Vol 574 ◽

pp. 65-74 ◽

Cited By ~ 2

Author(s):

J Thyrring ◽

KT Jensen ◽

MK Sejr

Keyword(s):

Range Expansion ◽

Mytilus Trossulus ◽

Intertidal Population

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High predatory efficiency and abundance drive expected ecological impacts of a marine invasive fish

Marine Ecology Progress Series ◽

10.3354/meps13251 ◽

2020 ◽

Vol 637 ◽

pp. 195-208 ◽

Cited By ~ 1

Author(s):

EM DeRoy ◽

R Scott ◽

NE Hussey ◽

HJ MacIsaac

Keyword(s):

Invasive Species ◽

Native Species ◽

Ecological Impact ◽

Marine Species ◽

Ecological Impacts ◽

Negative Effects ◽

Marine Predator ◽

Eastern Gulf Of Mexico ◽

Red Grouper ◽

Per Capita

The ecological impacts of invasive species are highly variable and mediated by many factors, including both habitat and population abundance. Lionfish Pterois volitans are an invasive marine species which have high reported detrimental effects on prey populations, but whose effects relative to native predators are currently unknown for the recently colonized eastern Gulf of Mexico. We used functional response (FR) methodology to assess the ecological impact of lionfish relative to 2 functionally similar native species (red grouper Epinephelus morio and graysby grouper Cephalopholis cruentata) foraging in a heterogeneous environment. We then combined the per capita impact of each species with their field abundance to obtain a Relative Impact Potential (RIP). RIP assesses the broader ecological impact of invasive relative to native predators, the magnitude of which predicts community-level negative effects of invasive species. Lionfish FR and overall consumption rate was intermediate to that of red grouper (higher) and graysby grouper (lower). However, lionfish had the highest capture efficiency of all species, which was invariant of habitat. Much higher field abundance of lionfish resulted in high RIPs relative to both grouper species, demonstrating that the ecological impact of lionfish in this region will be driven mainly by high abundance and high predator efficiency rather than per capita effect. Our comparative study is the first empirical assessment of lionfish per capita impact and RIP in this region and is one of few such studies to quantify the FR of a marine predator.

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