Behavioural generalism could facilitate coexistence of tropical and temperate fishes under climate change

Coni, Ericka O. C.; Booth, David J.; Ferreira, Camilo M.; Nagelkerken, Ivan

doi:10.1111/1365-2656.13599

Cited by 12 publications

(18 citation statements)

References 120 publications

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“…experimentally enforced competition), temperate fishes show increased feeding performance and higher aggression towards tropical fishes, and tropicals show increased sheltering with higher abundances of temperate fishes [ 68 ]. However, such competitive effects might be mitigated under more natural conditions, through behavioural [ 69 ] and trophic [ 70 ] niche segregation between tropical and temperate fishes. In addition, ocean warming and acidification are likely to diminish shoaling performance of mixed tropical-temperate fish shoals, diminishing any gained effects (if any) of mixed shoaling [ 12 ].…”

Section: Discussionmentioning

confidence: 99%

Coral-reef fishes can become more risk-averse at their poleward range limits

2022

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As climate warms, tropical species are expanding their distribution to temperate ecosystems where they are confronted with novel predators and habitats. Predation strongly regulates ecological communities, and range-extending species that adopt an effective antipredator strategy have a higher likelihood to persist in non-native environments. Here, we test this hypothesis by comparing various proxies of antipredator and other fitness-related behaviours between range-extending tropical fishes and native-temperate fishes at multiple sites across a 730 km latitudinal range. Although some behavioural proxies of risk aversion remained unaltered for individual tropical fish species, in general they became more risk-averse (increased sheltering and/or flight initiation distance), and their activity level decreased poleward. Nevertheless, they did not experience a decline in body condition or feeding rate in their temperate ranges. Temperate fishes did not show a consistently altered pattern in their behaviours across range locations, even though one species increased its flight initiation distance at the warm-temperate location and another one had lowest activity levels at the coldest range location. The maintenance of feeding and bite rate combined with a decreased activity level and increased sheltering may be behavioural strategies adopted by range-extending tropical fishes, to preserve energy and maintain fitness in their novel temperate ecosystems.

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Section: Discussionmentioning

confidence: 99%

Coral-reef fishes can become more risk-averse at their poleward range limits

2022

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“…Rapid movement of fishes poleward is altering the ecology of estuarine and marine systems ( e.g. , Coni et al , 2022; Luczak et al , 2011) with consequences for ecosystem services (Madin et al , 2012; Pinsky et al , 2021). Tracking changes in fish distributions is therefore important to inform effective management of estuarine and marine ecosystems.…”

Section: Figurementioning

confidence: 99%

“…, Champion et al , 2021; Robinson et al , 2015). The ecological consequences are difficult to predict, and warrant investigation given the ecological impacts of fish range expansions globally ( e.g ., Coni et al , 2022; Luczak et al , 2011).…”

Section: Figurementioning

confidence: 99%

“…A strengthening EAC is likely to transport greater numbers of P. kaakan to NSW, and this, combined with warming oceans and estuaries (Hobday & Lough, 2011;Scanes et al, 2020), may see increased numbers of P. kaakan establish in the region in coming decades, a repeat of the trend that is already occurring among other marine species (e.g., Champion et al, 2021;Robinson et al, 2015). The ecological consequences are difficult to predict, and warrant investigation given the ecological impacts of fish range expansions globally (e.g., Coni et al, 2022;Luczak et al, 2011).…”

Section: Pomadasys Argenteus (Forsskål 1775) or The Blotched Javelinmentioning

confidence: 99%

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Range expansion of a widespread Indo‐Pacific haemulid, the barred javelin Pomadasys kaakan (Cuvier, 1830), in a climate change hotspot

Mos

Mos²

2022

Journal of Fish Biology

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The authors report a first sighting of a euryhaline fish in the climate change hotspot along Australia's south-eastern coast. The barred javelin, Pomadasys kaakan (Cuvier, 1830) was found in the Nambucca River in New South Wales, Australia, during 2021 and 2022. Specimens were adult, suggesting they may not be transitory vagrants.The new southernmost location recorded here represents a c. 200 km out-of-range sighting compared to previous records, and is c. 380 km south of the southernmost Australian stronghold of the species in Moreton Bay, Queensland.

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“…Ectotherms such as fish are particularly susceptible to ocean warming and are frequently observed at the forefront of marine range extensions (Booth et al, 2011; Walther et al, 2002). Marine fishes entering new environments often modify their behaviour through novel interactions with resident species (Coni et al, 2021b; Nagelkerken & Munday, 2016). These novel interactions can determine the rate of range extension and, ultimately, a species range‐extension success.…”

Section: Introductionmentioning

confidence: 99%

Ocean warming and acidification degrade shoaling performance and lateralization of novel tropical–temperate fish shoals

Mitchell

Booth

Nagelkerken

2021

Global Change Biology

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Gregarious behaviours are common in animals and provide various benefits such as food acquisition and protection against predators. Many gregarious tropical species are shifting poleward under current ocean warming, creating novel species and social interactions with local temperate taxa. However, how the dynamics of these novel shoals might be altered by future ocean warming and acidification remains untested. Here we evaluate how novel species interactions, ocean acidification and warming affect shoaling dynamics, motor lateralization and boldness of range‐extending tropical and co‐shoaling temperate fishes under controlled laboratory conditions. Fishes were exposed to 1 of 12 treatments (combinations of three temperature levels, two pCO2 levels and two shoal type levels: mixed species or temperate only) for 38 days. Lateralization (a measure of asymmetric expression of cognitive function in group coordination and predator escape) of tropical and temperate species was right‐side biased under present‐day conditions, but side bias significantly diminished in tropical and temperate fishes under ocean acidification. Ocean acidification also decreased shoal cohesion irrespective of shoaling type, with mixed‐species shoals showing significantly lower cohesion than temperate‐only shoals irrespective of climate stressors. Tropical fish became bolder under ocean acidification (after 4 weeks), and temperate fish became bolder with increasing temperature, while ocean acidification dampened temperate fish boldness. Our findings highlight the direct effect of climate stressors on fish behaviour and the interplay with the indirect effects of novel species interactions. Because strong shoal cohesion and lateralization are key determinants of species fitness, their degradation under ocean warming and acidification could adversely affect species performance in novel assemblages in a future ocean, and might slow down tropical species range extensions.

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Behavioural generalism could facilitate coexistence of tropical and temperate fishes under climate change

Cited by 12 publications

References 120 publications

Coral-reef fishes can become more risk-averse at their poleward range limits

Coral-reef fishes can become more risk-averse at their poleward range limits

Range expansion of a widespread Indo‐Pacific haemulid, the barred javelin Pomadasys kaakan (Cuvier, 1830), in a climate change hotspot

Ocean warming and acidification degrade shoaling performance and lateralization of novel tropical–temperate fish shoals

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