Table S1: Search parameters used in ISI Web of Science. General search terms used for all mechanisms were (non-native* OR nonnative* OR invasi* OR introduc* OR non-indigenous OR nonindigenous OR alien OR exotic OR invade*) AND (estuar* OR marine OR coastal OR ocean* OR sea OR *tidal), followed by mechanism-specific terms outlined below. Search results were then refined using Web of Science tools to those pertaining only to Marine and Freshwater Biology, and all research areas that were clearly not relevant (e.g., not biological) were excluded. All remaining papers were then individually evaluated for relevance. Over 2500 papers were evaluated for negative interactions alone. Mechanism Search terms Negative Interactions AND ("biotic resistance" OR "invasion resistance" OR diversity OR "diversity invasibility" OR "empty niche*" OR "limiting similarity" OR "Darwin's naturalization" OR pre-adaptation OR "enemy release" OR "enemy escape" OR "natural enem*" OR "native enem*" OR allelopath* OR "chemical defense*" OR "novel weapon*" OR "novel chemical*" OR predat* OR herbivor* OR parasit* OR compet* OR consum*) Positive Interactions AND (meltdown OR facilitat* OR mutual* OR "positive interact*" OR commensal* OR "positive species interact*") Invader Traits AND (tolerance* OR tolerate* OR constrain* OR thermal OR heat OR cold OR freez* OR hypoxia OR copper OR "heavy metal" OR cadmium OR salinity OR desiccation OR nutrient* OR sedimentation OR antifouling OR UV OR ultraviolet OR deoxygenation OR dark* OR turbidity OR wave OR "growth rate" OR "rapid growth" OR maturation OR fecundity OR plasticity OR larval OR "body size" OR morphology OR reproduction OR "life history" OR metabolism OR behavior) AND (trait*) Post Introduction Evolution AND (EICA OR evolut* OR "rapid evolut*" OR hybrid* OR bottleneck*) Invasive Taxon Invasive Phylum Type of Study Consumption or Competition Focal Interaction Invasion Enhanced or Limited Citation Marenzelleria arctia Annelida E Competition Single-Species Competition Enhanced (Karlson et al. 2011) Marenzelleria cf. wireni Annelida O Competition Single-Species Competition Enhanced (Essink 1999) Marenzelleria cf. wireni Annelida O Competition Single-Species Competition Enhanced (Essink et al. 1998) Marenzelleria viridis Annelida E Competition Single-Species Competition Enhanced (Kotta & Ólafsson 2003) Artemia franciscana Arthropoda O Consumption Parasitism Enhanced (Georgiev et al. 2007) Balanus glandula Arthropoda O Competition Single-Species Competition Enhanced (Vallarino & Elias 1997) Caprella mutica Arthropoda E Competition Diversity (Multi-species Competition) Enhanced (Shucksmith et al. 2009 Carcinus maenas Arthropoda O Consumption Parasitism Enhanced (Blakeslee et al. 2009) Carcinus maenas Arthropoda E Consumption Predation Limited (deRivera et al. 2005) Carcinus maenas Arthropoda E Consumption Predation Limited (Hunt & Yamada 2003) Carcinus maenas Arthropoda O Consumption & Competition Predation & Single-Species Competition Limited (Jensen et al. 2002) Carcinus maenas Arthropoda E Consump...

The roles of temperature and light on grazing and photosynthesis were examined for Dinobryon sociale, a common freshwater mixotrophic alga. Photosynthetic rate was determined for D. sociale adapted to temperatures of 8, 12, 16, and 20°C under photosynthetically active radiation light irradiances of 25, 66, and 130 μmol photons · m(-2)  · s(-1) , with concurrent measurement of bacterial ingestion at all temperatures under medium and high light (66 and 130 μmol photons · m(-2)  · s(-1) ). Rates of ingestion and photosynthesis increased with temperature to a maximum at 16°C under the two higher light regimes, and declined at 20°C. Although both light and temperature had a marked effect on photosynthesis, there was no significant difference in bacterivory at medium and high irradiances at any given temperature. At the lowest light condition (25 μmol photons · m(-2)  · s(-1) ), photosynthesis remained low and relatively stable at all temperatures. D. sociale acquired the majority of carbon from photosynthesis, although the low photosynthetic rate without a concurrent decline in feeding rate at 8°C suggested 20%-30% of the carbon budget could be attributed to bacterivory at low temperatures. Grazing experiments in nutrient-modified media revealed that this mixotroph had increased ingestion rates when either dissolved nitrogen or phosphorus was decreased. This work increases our understanding of environmental effects on mixotrophic nutrition. Although the influence of abiotic factors on phagotrophy and phototrophy in pure heterotrophs and phototrophs has been well studied, much less is known for mixotrophic organisms.

Summary The effects of changes in chromophoric dissolved organic matter (CDOM) on zooplankton grazers in pelagic food webs can be difficult to predict due to the potential for conflicting direct and indirect effects of CDOM on water column optics and food‐web dynamics. We compared the responses of two dominant zooplankton groups, Daphnia spp. and calanoid copepods, to elevated CDOM in two mesocosm experiments conducted in a transparent, oligotrophic lake. In the first experiment, low, medium and high additions of CDOM [dissolved organic carbon (DOC) = 2.7, 3.0 and 4.3 mg L−1, respectively] and non‐manipulated controls (DOC = 1.6 mg L−1) were used to test the hypothesis that food‐web stimulation will increase with CDOM concentration. In the second experiment, we manipulated both CDOM (control and addition) and ultraviolet radiation (UV; ambient and shielded) to determine the importance of CDOM as a UV screen, as well as to examine the role of UV in food‐web stimulation by CDOM. We also conducted short‐term bioassays alongside this second experiment to assess the food resources for Daphnia and calanoids in treatments with UV‐exposed and non‐UV‐exposed CDOM. Daphnia abundance increased in the low and medium CDOM additions in the first experiment, and when food resources were simultaneously stimulated by CDOM and protected from the direct negative effects of UV in the second experiment. In contrast, calanoid copepod abundance declined or remained unchanged when CDOM was added, and this response was not mediated by food resources. Overall, our findings suggest that increased CDOM in clear lakes could alter the relative abundance of zooplankton groups through a combination of direct and indirect effects.

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