Behavioral differentiation of underyearlings of the Black Sea salmon Salmo trutta labrax: Rheoreaction in the year preceding smoltification

Павлов, Д. С.; Kostin, V. V.; Ponomareva, V. Yu.

doi:10.1134/s0032945210030070

Cited by 26 publications

(5 citation statements)

References 8 publications

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“…Morphologically intermediate groups commonly demonstrate a reduced feeding selectivity, which can lead to lower survival rates than specialists (Schluter, ; McLaughlin et al ., ). Polymorphic fishes, such as salmonids, commonly diverge into morphs consuming either bottom or water column food items (sedentary vs. active swimmers) and show a mismatching growth rate from an early age (Metcalfe et al ., ; Biro & Ridgway, ; Noakes, ; Pavlov et al ., ). Specializing on alternative resources in cold water lakes typically results in benthos, plankton and predatory feeding morphs (Behnke, ; Jonsson & Jonsson, ).…”

Section: Introductionmentioning

confidence: 99%

Juvenile divergence in adaptive traits among seven sympatric fish ecomorphs arises before moving to different lacustrine habitats

Есин

Маркевич

Pichugin

2018

J of Evolutionary Biology

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Identifying the mechanisms initiating sympatric diversification in vertebrates has remained a conceptual challenge. Here, we analyse an assemblage of sympatric charr (Salvelinus malma) morphs from landlocked Lake Kronotskoe basin as a model to uncover the divergence pathways in freshwater fishes during the early life history stages. All morphs have distinct developmental biology, but a similar developmental rate retardation compared to the ancestor. Our study reveals that adult morphological differences, which acquire functionality at maturation, originate in the early juvenile stages due to heterochrony in skeletogenesis and allometric changes triggered by variation in metabolic activity. The craniofacial differences among the morphs result from asynchronous development of several skeletal modules. The accelerated ossification of teeth-armed bones occurs in predatory feeding morphs, whereas cranial cover ossification is promoted in benthivorous morphs. These contrasting growth patterns have led to seven phenotypes that span a range far beyond the ancestral variability. The most distinct morphs are a riverine spawning, epilimnetic predator and a lacustrine spawning, profundal benthic feeder. Taken together, we argue that the adaptive morphological differentiation in these sympatric freshwater fishes is driven by diverging patterns in ossification rate and metabolic activity against a background of uneven somatic growth. This divergence is primarily associated with basic environmental differences on the nursery grounds that might be unrelated to resource use. This nonheritable phenotype divergence is then exposed to natural selection that could result in further adaptive genetic changes.

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Section: Introductionmentioning

confidence: 99%

Juvenile divergence in adaptive traits among seven sympatric fish ecomorphs arises before moving to different lacustrine habitats

Есин

Маркевич

Pichugin

2018

J of Evolutionary Biology

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“…This corresponds to the close-to-zero value of the contranatance index. Under natural conditions, such a ratio of the types of rheoreaction was observed in nonmigratory fish (Pavlov et al, 2010(Pavlov et al, , 2010a(Pavlov et al, , 2020b. Consequently, before starvation, the experimental fish did not have a migratory state: in the experimental device they manifested resident behavior with a dynamic way of maintaining location.…”

Section: Resultsmentioning

confidence: 91%

“…On the 2nd-5th days of starvation, the frequency of NRT in all studied fish became higher than that of PRT (Table 1). Such a ratio of rheoreaction types in natural conditions indicates the downstream movement (migration) of fish (Pavlov et al, 2010a(Pavlov et al, , 2010b(Pavlov et al, , 2020bZvezdin, 2016). Then the motivation to move against the current increased.…”

Section: Resultsmentioning

confidence: 99%

Changes in the Ratio of Rheoreaction Types during Fish Starvation

Павлов

Kostin

Parshina

et al. 2021

Biol Bull Russ Acad Sci

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Changes in the motivational component of rheoreaction (the ratio of rheoreaction types) during starvation in some fish species has been analyzed. The presence of fish motivation to migrate (before starvation) is the major pattern of the future changes in the motivational component of rheoreaction resulting from starvation. All fish of the families Cyprinidae and Salmonidae studied with initially behavior as resident individuals show the same type of response to starvation. Their preference for currentwise movement increases on the 2nd–5th days of starvation, then the preference for movement against the current increases on the 7th–12th days, and the ratio of rheoreaction types approaches the initial one. Juveniles of the Black Sea salmon (Salmo trutta labrax) with a motivation to downstream migration, represent a different response to starvation: the downstream movement of individuals monotonically increased from two days after starvation.

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“…Rheoreaction is one of the main behavioral mechanisms of distribution, dispersal, and migration of fish (Pavlov et al, 2010(Pavlov et al, , 2010a(Pavlov et al, , 2010bZvezdin, 2016). A common and easy assessment of the attitude of fish to the current is rheopreferendum, i.e., the preference or avoidance of the current by fish (Pavlov et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Rheoreaction in Danio rerio (Cyprinidae): Influence of Flow Velocity and Availability of Still Water Zones

2022

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The results of an experimental study of the influence of the flow velocity on the rheoreaction indices of Danio rerio, rheopreferendum and the ratio of the frequencies of various types of rheoreaction, are presented. At a crucial for fish flow velocity of 0.30, their rheopreferendum is positive, while at 0.80, negative. The ratio of rheoreaction types at these velocity levels was typical for resident fish. At a crucial flow velocity of 0.45, the rheopreferendum was not expressed, and the fish behavior was typical for upstream-migrating individuals. A decrease in the accessibility of the limnozone (limitation of the zone’s entrance width) in the circular tank reduces the number of fish returning to it and changes the ratio of their rheoreaction types. At the maximum width of the entrance (19 cm), the ratio of zebrafish rheoreaction types reflects the behavior characteristic of migrating individuals, while for all other variants (10, 3, and 1 cm) it is typical for resident forms. It is shown that the rheopreferendum is a less complete and reliable assessment of rheoreaction than the ratio of rheoreaction types. The applicability of rheoreaction indicators is considered.

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Behavioral differentiation of underyearlings of the Black Sea salmon Salmo trutta labrax: Rheoreaction in the year preceding smoltification

Cited by 26 publications

References 8 publications

Juvenile divergence in adaptive traits among seven sympatric fish ecomorphs arises before moving to different lacustrine habitats

Juvenile divergence in adaptive traits among seven sympatric fish ecomorphs arises before moving to different lacustrine habitats

Changes in the Ratio of Rheoreaction Types during Fish Starvation

Rheoreaction in Danio rerio (Cyprinidae): Influence of Flow Velocity and Availability of Still Water Zones

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