Shifts between cooperation and antagonism driven by individual variation: a systematic synthesis review

Moran, Nicholas Patrick; Caspers, Barbara A.; Chakarov, Nayden; Ernst, Ulrich; Fricke, Claudia; Kurtz, Joachim; Lilie, Navina D.; Lo, Lai Ka; Müller, Caroline; Reshma, R; Takola, Elina; Trimmer, Pete C.; Benthem, Koen J. van; Winternitz, Jamie; Wittmann, Meike J.

doi:10.1111/oik.08201

Cited by 13 publications

(11 citation statements)

References 138 publications

(225 reference statements)

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“…It is known that sh can be "stolen" from inside cast nets by dolphins (Ilha et al 2020) and teeth marks on mullets captured by shers are not rare (Simões-Lopes 1991). Thus, considering the non-xed nature of any ecological interaction, this relationship may fall within a exible continuum around the cooperation depending on the individual's engagement and environmental factors (Dounias 2018;Moran et al 2022;Cantor et al 2023). The elements of this continuum are not only possible evolutionary precursors of wildlife-human cooperations (Cram et al 2022), but can also have a narrower, more precise, meaning for the cooperative dolphins currently.…”

Section: Discussionmentioning

confidence: 99%

Behavioral Repertoire of Lahille’s Bottlenose Dolphins During the “cooperative Fishing” With Artisanal Fishers

Serpa,

Frainer,

Santos

et al. 2023

Preprint

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Many human cultures have been established by positive interactions with wildlife over the last centuries. Lahille’s bottlenose dolphins (Tursiops gephyreus), for example, have historically developed tactics for coastal and estuarine foraging, which sustains a fishing art known as “cooperative fishing” by traditional fishers in estuaries of southern Brazil. Using Unmanned Aerial Vehicles footage, in this study, we explored the behavior of the Lahille’s bottlenose dolphins in the Tramandaí Inlet. We focused on how their behavior repertoire was related with the frequency of net casting by fishers. Close to eight hours of aerial footage recorded from June 2017 to May 2018 were analyzed. Our observations comprise mainly dolphins foraging in the estuary inlet when fishers were present along the shoreline. Dolphins performed at least 25 clearly distinct behaviors and three types of movement patterns. A Generalized Additive Model supported that the fishers interpret a subset of this repertoire (64%) as cues for throwing their cast nets. The behavioral overview of the Lahille’s bottlenose dolphins presented here demonstrates not only a diverse repertoire for this population, but also its clear influence on fishers’ activities. It is clear that ethological, scientific and traditional perspectives should be integrated to better understand the ecological significance of this cooperative fishing, for both dolphin populations and fishers that depend on them.

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Section: Discussionmentioning

confidence: 99%

Behavioral Repertoire of Lahille’s Bottlenose Dolphins During the “cooperative Fishing” With Artisanal Fishers

Serpa,

Frainer,

Santos

et al. 2023

Preprint

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“…Our study highlighting the importance of behavioral synchrony within human–wildlife interactions—here, cooperative foraging between fishers and dolphins—generates insights into ecological interaction dynamics, and the conditions under which they can flip from positive to negative ( 7 , 10 , 12 , 13 )—here, from mutually beneficial to antagonistic. Crashes in mullet availability can reduce mutual benefits, causing fishers to abandon their cultural fishery and exposing dolphins to bycatch from indiscriminate fishing practices, ultimately turning this rare human–wildlife mutualism into yet one more conflict.…”

Section: Safeguarding An Interspecific Cultural Unitmentioning

confidence: 90%

“…Such changes, plus individual foraging variation among fishers and dolphins, could jeopardize the synchrony that is key for their mutual success. Mutualisms are sensitive to fluctuations in resource availability and in the participants’ behavior that change their accrued benefits ( 10 – 13 ), which could explain past extinctions of human–cetacean cooperation ( Fig. 1 ).…”

Section: Local Behavioral Changes Can Buffer the Mutualism Against Re...mentioning

confidence: 99%

“…Theoretical work shows how the nature of ecological interactions can flip between positive and negative, as changes in resource availability or behavior shifts the cost–benefit ratio for the interacting parties ( 10 – 12 ). However, predicting such dynamics in human–wildlife interactions is challenging ( 7 , 13 ) and requires unpacking how the interplay between environmental factors and behavioral mechanisms confer benefits to the interacting individuals.…”

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confidence: 99%

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Foraging synchrony drives resilience in human–dolphin mutualism

Cantor

Farine

Daura‐Jorge

2023

Proc. Natl. Acad. Sci. U.S.A.

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Interactions between humans and nature have profound consequences, which rarely are mutually beneficial. Further, behavioral and environmental changes can turn human–wildlife cooperative interactions into conflicts, threatening their continued existence. By tracking fine-scale behavioral interactions between artisanal fishers and wild dolphins targeting migratory mullets, we reveal that foraging synchrony is key to benefiting both predators. Dolphins herd mullet schools toward the coast, increasing prey availability within the reach of the net-casting fishers, who gain higher foraging success—but only when matching the casting behavior with the dolphins’ foraging cues. In turn, when dolphins approach the fishers’ nets closely and cue fishers in, they dive for longer and modify their active foraging echolocation to match the time it takes for nets to sink and close over mullets—but only when fishers respond to their foraging cues appropriately. Using long-term demographic surveys, we show that cooperative foraging generates socioeconomic benefits for net-casting fishers and ca. 13% survival benefits for cooperative dolphins by minimizing spatial overlap with bycatch-prone fisheries. However, recent declines in mullet availability are threatening these short- and long-term benefits by reducing the foraging success of net-casting fishers and increasing the exposure of dolphins to bycatch in the alternative fisheries. Using a numerical model parametrized with our empirical data, we predict that environmental and behavioral changes are pushing this traditional human–dolphin cooperation toward extinction. We propose two possible conservation actions targeting fishers’ behavior that could prevent the erosion of this century-old fishery, thereby safeguarding one of the last remaining cases of human–wildlife cooperation.

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“…The distribution area of T. fuana in the Gyirong region was relatively narrow ( Song et al., 2020b ), hence it showed a certain extent of ITV. Generally, the variation within populations reflects the plasticity and flexibility of the species to adapt to the environment, while the variation among populations reveals the influence of environmental selection ( Siefert et al., 2015 ; Lajoie and Vellend, 2018 ; Moran et al., 2022 ). We found a small proportion of the ITV in T. fuana originated from among populations, perhaps because of the narrow distribution with little environmental heterogeneity among populations, and then failed to generate a large variation.…”

Section: Discussionmentioning

confidence: 99%

Intraspecific and sex-dependent variation of leaf traits along altitude gradient in the endangered dioecious tree Taxus fuana Nan Li & R.R. Mill

Shen-Tu

et al. 2022

Front. Plant Sci.

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Plant intraspecific trait variation (ITV) including sex-dependent differences are matters of many ecological consequences, from individual to ecosystem, especially in endangered and rare species. Taxus fuana is an endangered dioecious species with small and isolated populations endemic to the Himalayas region. Little is known about its trait variation between sexes, and among populations. In this study, 18 leaf traits from 179 reproductive trees (males and females) along the altitude (2600-3200m a.s.l.) of the T. fuana populations distributed in Gyirong County, Tibet, China, were measured. ITV and sources of variation in leaf traits were assessed. The relationship between leaf traits of males and females and altitude was analyzed separately. Variations in leaf traits of T. fuana ranged from 3.1% to 24.2%, with the smallest in leaf carbon content and the largest in leaf thickness to area ratio. On average 78.13% of the variation in leaf traits was from within populations and 21.87% among populations. The trends in leaf width, leaf nitrogen to phosphorus ratio, leaf carbon to nitrogen ratio, leaf carbon isotope ratio, and leaf nitrogen isotope ratio in relation to altitude were the same for males and females. Leaf length to width ratio varied significantly with altitude only in males, while leaf phosphorus content, leaf nitrogen content, and leaf carbon to phosphorus ratio varied significantly with altitude only in females. The correlation coefficients of most leaf traits of females with altitude were larger than that of males. In the relationship between leaf traits, there was a high similarity among males and females, but the altitude accounted for more explanation in females than in males. Our results suggested that the variation in leaf traits of T. fuana was small and did not dominate the interspecific competition in the local communities. Adaptation to the altitude gradient of T. fuana might be through altering nutrient storage processes and water use efficiency. Adaptation of male and female T. fuana to environmental changes showed differences, where the males were more tolerant and the females responded greatly to altitude. The differences in adaptation strategies between male and female T. fuana may be detrimental to the maintenance of their populations.

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Shifts between cooperation and antagonism driven by individual variation: a systematic synthesis review

Cited by 13 publications

References 138 publications

Behavioral Repertoire of Lahille’s Bottlenose Dolphins During the “cooperative Fishing” With Artisanal Fishers

Behavioral Repertoire of Lahille’s Bottlenose Dolphins During the “cooperative Fishing” With Artisanal Fishers

Foraging synchrony drives resilience in human–dolphin mutualism

Intraspecific and sex-dependent variation of leaf traits along altitude gradient in the endangered dioecious tree Taxus fuana Nan Li & R.R. Mill

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