Ecological and environmental context shape the differential effects of a facilitator in its native and invaded ranges

Non-indigenous species often exhibit disproportionately strong negative effects in their introduced range compared to their native range, and much research has been devoted to understanding the role of shared evolutionary history, or lack thereof, in driving these differences. Less studied is whether non-indigenous species, particularly those that are important as facilitators in their native range, have persistent positive effects in their invaded range despite a lack of a shared evolutionary history with the invaded community. Here, we manipulated the density of a habitat-forming facilitator, the high intertidal acorn barnacle Balanus glandula, factorially with herbivore density in its native range (Bluestone Point, British Columbia, Canada) and invaded range (Punta Ameghino, Chubut Province, Argentina) to determine how this facilitator differentially affects associated species at these two locations. Given that high intertidal species at Punta Ameghino (PA) are evolutionarily naïve to barnacles, we predicted that the positive effects of B. glandula at PA would absent or weak compared to those at Bluestone Point (BP). However, we found that B. glandula had an equally positive effect on herbivore biomass at PA compared to BP, possibly because the moisture-retaining properties of barnacle bed habitats are particularly important in seasonally dry Patagonia. Barnacle presence indirectly decreased ephemeral algal cover at BP by increasing grazer pressure, but barnacles instead facilitated ephemeral algae at PA. In contrast, B. glandula increased perennial algal cover at BP, but generally decreased perennial algal cover at PA, likely due to differences in dominant algal morphology. These results suggest that shared evolutionary history is not a prerequisite for strong facilitation to occur, but rather that the nature and strength of novel species interactions are determined by the traits of associated species and the environment in which they occur.

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Seasonal and bathymetric effects on macrofouling invertebrates’ primary succession in a mediterraenan non-indigenous species hotspot area

Mediterranean Marine Science ◽

10.12681/mms.14786 ◽

2018 ◽

Vol 19 (3) ◽

pp. 572 ◽

Cited By ~ 5

Author(s):

MARCO LEZZI ◽

ADRIANA GIANGRANDE

Keyword(s):

Community Development ◽

Species Interactions ◽

Primary Succession ◽

Mytilus Galloprovincialis ◽

Abundant Species ◽

Artificial Substrates ◽

Indigenous Species ◽

Central Mediterranean ◽

Almost All ◽

Non Indigenous Species

The present study investigates macrofouling development in the Mar Grande of Taranto (Central Mediterranean Sea), a wide confined area that has attracted considerable attention in recent years due to the establishment of numerous non-indigenous species (NIS). Different starting times of a yearly primary succession on artificial substrates were tracked so as to investigate the matching of the development pattern with contingency and/or convergence models, identifying NIS’s structural role in the community endpoint. Our results show that during the experiment all assemblages tended to converge towards multiple contingent communities according to starting times and depths. The differences are due to propagule availability which influence further species interactions. Thus the endpoint patterns are defined by a contingent community development determined by the seasonal species pool, their phenologies, pre- and post-settlement events, and species interactions. The most important structuring species was Mytilus galloprovincialis, which was present in almost all the endpoint assemblages, in particular when it recruits at early stages of the community development. Another abundant species at the endpoint was the alien Branchiomma boholense; which was a persistent structural component contributing to an alternative state in which Mytilus galloprovincialis loses its structural importance and where B. boholense becomes dominant, leading to an increase in fouling biodiversity of the endpoint assemblage.

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Social networks allow early detection of non indigenous species

Acta Adriatica ◽

10.32582/aa.58.2.15 ◽

2017 ◽

Vol 58 (2) ◽

pp. 363-368 ◽

Cited By ~ 2

Author(s):

Joachim Langeneck ◽

Massimiliano Marcelli ◽

Michel Bariche ◽

Ernesto Azzurro

Keyword(s):

Social Networks ◽

Demersal Fish ◽

Red Drum ◽

Sciaenops Ocellatus ◽

Indigenous Species ◽

Native Range ◽

Top Predators ◽

The Individual ◽

Non Indigenous Species ◽

Aquaculture Facilities

The red drum Sciaenops ocellatus is a large demersal fish that represents one of the top predators in estuarine environments of its native range. This species is commonly reared in aquaculture facilities, and it has already been reported as non indigenous from several countries. Here we report its first sighting in Italian waters, as well as the second documented occurrence for the Mediterranean Sea. The individual was landed in southern Sicily by artisanal fishery and this unusual observation was immediately shared on Facebook. The importance of considering social networks as tools for NIS detection is briefly discussed in light of the recognized difficulties to properly track biological introductions in the marine environment.

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Undesirable Effects of Goal Setting on Perceived Fairness, Commitment, and Unethical Behavior

Zeitschrift für Arbeits- und Organisationspsychologie A&O ◽

10.1026/0932-4089/a000267 ◽

2018 ◽

Vol 62 (2) ◽

pp. 97-107 ◽

Cited By ~ 2

Author(s):

Nina Keith

Keyword(s):

Goal Setting ◽

Unethical Behavior ◽

The United States ◽

Goal Commitment ◽

Management Technique ◽

Long Term Effects ◽

Perceived Fairness ◽

Negative Effects ◽

Positive Effects ◽

And Performance

Abstract. The positive effects of goal setting on motivation and performance are among the most established findings of industrial–organizational psychology. Accordingly, goal setting is a common management technique. Lately, however, potential negative effects of goal-setting, for example, on unethical behavior, are increasingly being discussed. This research replicates and extends a laboratory experiment conducted in the United States. In one of three goal conditions (do-your-best goals, consistently high goals, increasingly high goals), 101 participants worked on a search task in five rounds. Half of them (transparency yes/no) were informed at the outset about goal development. We did not find the expected effects on unethical behavior but medium-to-large effects on subjective variables: Perceived fairness of goals and goal commitment were least favorable in the increasing-goal condition, particularly in later goal rounds. Results indicate that when designing goal-setting interventions, organizations may consider potential undesirable long-term effects.

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Mobilizing for Some

Journal of Media Psychology Theories Methods and Applications ◽

10.1027/1864-1105/a000199 ◽

2016 ◽

Vol 28 (3) ◽

pp. 123-135 ◽

Cited By ~ 7

Author(s):

Raffael Heiss ◽

Jörg Matthes

Keyword(s):

High School ◽

Social Media ◽

High School Students ◽

Experimental Design ◽

Collective Efficacy ◽

Political Efficacy ◽

Negative Effects ◽

School Students ◽

Positive Effects ◽

Specific Factors

Abstract. This study investigated the effects of politicians’ nonparticipatory and participatory Facebook posts on young people’s political efficacy – a key determinant of political participation. We employed an experimental design, using a sample of N = 125 high school students (15–20 years). Participants either saw a Facebook profile with no posts (control condition), nonparticipatory posts, or participatory posts. While nonparticipatory posts did not affect participants’ political efficacy, participatory posts exerted distinct effects. For those high in trait evaluations of the politician presented in the stimulus material or low in political cynicism, we found significant positive effects on external and collective efficacy. By contrast, for those low in trait evaluations or high in cynicism, we found significant negative effects on external and collective efficacy. We did not find any effects on internal efficacy. The importance of content-specific factors and individual predispositions in assessing the influence of social media use on participation is discussed.

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On the diversity of the effects of the state support for agriculture

Voprosy Ekonomiki ◽

10.32609/0042-8736-2019-4-59-73 ◽

2019 ◽

pp. 59-73 ◽

Cited By ~ 3

Author(s):

Nikolai M. Svetlov ◽

Renata G. Yanbykh ◽

Dariya A. Loginova

Keyword(s):

Agricultural Production ◽

The State ◽

Russian Regions ◽

Negative Effects ◽

State Support ◽

Soft Budget Constraints ◽

Institutional Conditions ◽

Positive Effects ◽

Production Factors ◽

Corporate Farms

In this paper, we assess the effects of agricultural state support of corporate farms on their revenues from agricultural production sales in 14 Russian regions that differ in technology, environment and institutional conditions. In addition to the direct effect of the state support, the indirect effects via labor and capital are revealed. For this purpose, we identify production functions and statistical models of production factors for each of these regions separately. We find out diverse effects of the state support on revenues among the regions. Positive effects prevail. Negative effects are mainly caused by labor reductions that follow subsidy inflows. Another cause of negative effects is the soft budget constraints phenomenon.

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Effects of marine reserves on predator-prey interactions in central California kelp forests

Marine Ecology Progress Series ◽

10.3354/meps13526 ◽

2020 ◽

Vol 655 ◽

pp. 139-155

Author(s):

DC Yates ◽

SI Lonhart ◽

SL Hamilton

Keyword(s):

Species Interactions ◽

Size Structure ◽

Marine Reserves ◽

Mortality Rates ◽

Kelp Forests ◽

Negative Effects ◽

Central California ◽

Invertebrate Predators ◽

Predatory Fishes ◽

Density And Biomass

Marine reserves are often designed to increase density, biomass, size structure, and biodiversity by prohibiting extractive activities. However, the recovery of predators following the establishment of marine reserves and the consequent cessation of fishing may have indirect negative effects on prey populations by increasing prey mortality. We coupled field surveys with empirical predation assays (i.e. tethering experiments) inside and outside of 3 no-take marine reserves in kelp forests along the central California coast to quantify the strength of interactions between predatory fishes and their crustacean prey. Results indicated elevated densities and biomass of invertebrate predators inside marine reserves compared to nearby fished sites, but no significant differences in prey densities. The increased abundance of predators inside marine reserves translated to a significant increase in mortality of 2 species of decapod crustaceans, the dock shrimp Pandalus danae and the cryptic kelp crab Pugettia richii, in tethering experiments. Shrimp mortality rates were 4.6 times greater, while crab mortality rates were 7 times greater inside reserves. For both prey species, the time to 50% mortality was negatively associated with the density and biomass of invertebrate predators (i.e. higher mortality rates where predators were more abundant). Video analyses indicated that macro-invertivore fishes arrived 2 times faster to tethering arrays at sites inside marine reserves and began attacking tethered prey more rapidly. The results indicate that marine reserves can have direct and indirect effects on predators and their prey, respectively, and highlight the importance of considering species interactions in making management decisions.

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MORPHOLOGICAL AND BIOCHEMICAL RESPOSES OF COW PEA (CV. PUSA BARSATI) GROWN ON FLY ASH AMENDED SOIL IN PRESENCE AND ABSENCE OF MELOIDOGYNE JAVANICA AND RHIZOBIUM LEGUMINOSARUM

Ecoprint An International Journal of Ecology ◽

10.3126/eco.v17i0.4098 ◽

1970 ◽

Vol 17 ◽

pp. 17-22 ◽

Cited By ~ 1

Author(s):

Kamal Singh ◽

A. A. Khan ◽

Iram Khan ◽

Rose Rizvi ◽

M. Saquib

Keyword(s):

Fly Ash ◽

Plant Growth ◽

Rhizobium Leguminosarum ◽

Growth Yield ◽

Maximum Growth ◽

Meloidogyne Javanica ◽

Growth And Yield ◽

Negative Effects ◽

Positive Effects ◽

Insignificant Difference

Plant growth, yield, pigment and protein content of cow-pea were increased significantly at lower levels (20 and 40%) of fly ash but reverse was true at higher levels (80 and 100%). Soil amended by 60% fly ash could cause suppression in growth and yield in respect to 40% fly ash treated cow-pea plants but former was found at par with control (fly ash untreated plants). Maximum growth occurred in plants grown in soil amended with 40% fly ash. Nitrogen content of cow-pea was suppressed progressively in increasing levels of fly ash. Moreover, Rhizobium leguminosarum influenced the growth and yield positively but Meloidogyne javanica caused opposite effects particularly at 20 and 40% fly ash levels. The positive effects of R. leguminosarum were marked by M. javanica at initial levels. However, at 80 and 100% fly ash levels, the positive and negative effects of R. leguminosarum and/or M. javanica did not appear as insignificant difference persist among such treatments.Key words: Meloidogyne javanica; Rhizobium leguminosarum; Fly ash; Growth; YieldDOI: 10.3126/eco.v17i0.4098Ecoprint An International Journal of Ecology Vol. 17, 2010 Page: 17-22 Uploaded date: 28 December, 2010

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Remedies in BRICS Countries

10.1093/oso/9780198810674.003.0009 ◽

2018 ◽

Cited By ~ 1

Author(s):

Svetlana Avdasheva ◽

Tatiana Radchenko

Keyword(s):

South Africa ◽

Division Of Labor ◽

Market Performance ◽

International Division ◽

Negative Effects ◽

Positive Effects ◽

Managerial Decisions ◽

Brics Countries ◽

Target Company ◽

Specific Position

Within the group of BRICS, China, Russia, and South Africa use conduct remedies more often than developed jurisdictions. Remedies are applied under merger approval or as an outcome of investigation of anticompetitive conducts. Effects of conduct remedies on companies’ decisions and market performance still need explanation. This chapter explains the use of conduct remedies, with special emphasis on Russia, by the specific position of BRICS in international division of labor, which allows the large companies, and first of all domestic ones, to discriminate customers in BRICS home markets, vis-à-vis international customers. Together with positive effects on domestic customers, competition economics predicts the possibility of negative effects of remedies on the managerial decisions within the target company. Under some circumstances, remedies may even weaken competition in the global product markets.

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