Age and growth of diadromous Galaxias maculatus (Jenyns, 1842) in southernmost South America (54° S) including contribution of age classes to reproduction

Rojo, Javier Hernán; Figueroa, Daniel E.; Boy, Claudia Clementina

doi:10.1007/s10641-018-0765-8

Cited by 10 publications

(9 citation statements)

References 46 publications

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“…; Rypel ; Rojo et al. ), and the apparent persistence of a latitude‐specific growth response over subsequent years (Hostetter and Munroe ) suggest that CnGV in growth is responsible for the age‐1 Tautogs’ responses to temperature, as reported for both laboratory (herein) and field situations (Cooper ; Hostetter and Munroe ).…”

Section: Discussionsupporting

confidence: 58%

“…Size-selective overwinter mortality and general compensatory growth following a lengthy period of wintertime growth depression are both potential drivers of this growth compensation, either individually or in concert. The rather widespread nature of CnGV in growth of fishes, a cryptic form of growth rate plasticity that provides at least some degree of compensation for a shorter growing season (Conover et al 2009;Rypel 2012;Rojo et al 2018), and the apparent persistence of a latitude-specific growth response over subsequent years (Hostetter and Munroe 1993) suggest that CnGV in growth is responsible for the age-1 Tautogs' 706 responses to temperature, as reported for both laboratory (herein) and field situations (Cooper 1967;Hostetter and Munroe 1993).…”

Section: Discussionmentioning

confidence: 65%

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Latitudinal Growth Variation in Young Tautogs: A Field, Laboratory, and Growing Degree‐Day Assessment of Potential Intrinsic Differences in Growth Responses to Temperature

Martin

Targett

2019

Trans Am Fish Soc

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A difference in size at age of young Tautogs Tautoga onitis has been reported from two sites in the Mid‐Atlantic Bight, USA, whereby southern fish (Virginia [VA]) reach a twofold greater size than northern fish (Rhode Island [RI]) by age 1 but grow at similar size‐dependent annual rates thereafter. We investigated the basis for this difference by using a coordinated field, laboratory, and growing degree‐day (GDD) approach. Age‐0 Tautogs were sampled from three locations (Chesapeake Bay, VA; Delaware Bay, Delaware [DE]; and Narragansett Bay, RI) and showed a clinal relationship of decreasing fish size and growth rate with increasing latitude. Otolith‐based estimates of larval stage duration and growth rate showed no significant clinal relationship. Young Tautogs from these locations were reared in common‐garden experiments (at 5, 15, and 25°C) to determine whether there were intrinsic postsettlement growth differences related to temperature. None of the location‐specific groups of age‐0 Tautogs exhibited growth that was consistently faster than that of Tautogs from the other locations over all temperatures examined. These data and the results of a GDD assessment between VA and RI indicate that latitudinal differences in temperature regime and growing season length are the major factors determining latitudinal growth differences in age‐0 fish. However, age‐1 RI fish of equivalent size grew significantly faster than age‐0 RI and DE fish and similar to age‐0 VA fish at 15°C and grew 40% faster than all age‐0 fish at 25°C, suggesting countergradient growth variation in age‐1 and older northern Tautogs. Size‐selective overwinter mortality of age‐0 northern fish—whereby smaller individuals are most susceptible to low temperature—is proposed as the likely underlying mechanism leading to faster growth of older northern fish at temperature. Such a mechanism would at least partially compensate for the lower temperature and shorter growing season at higher latitudes.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 65%

Latitudinal Growth Variation in Young Tautogs: A Field, Laboratory, and Growing Degree‐Day Assessment of Potential Intrinsic Differences in Growth Responses to Temperature

Martin

Targett

2019

Trans Am Fish Soc

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“…Sexually mature G. maculatus were less than one year old, supporting the conventional belief that they are an annual species (McDowall, ; Rojo et al, ). Growth rates and age at maturity differed between autumn‐ and winter‐hatched fish, but body size at maturity and reproductive investment did not.…”

Section: Discussionsupporting

confidence: 56%

“…Juvenile and adult growth rates during freshwater life are less studied. Growth is typically measured by fitting growth curves to size‐at‐age data (Iida et al, ; Rojo, Figueroa, & Boy, ) or changes in fish length from tagged and recaptured adults (West, Jowett, & Richardson, ). This gives information on whole life history growth (including the pelagic phase) does not explicitly give insights into freshwater growth histories, or the relationships between marine and freshwater growth.…”

Section: Introductionmentioning

confidence: 99%

Understanding the life histories of amphidromous fish by integrating otolith‐derived growth reconstructions, post‐larval migrations and reproductive traits

Egan

Hickford

Schiel

2019

Aquatic Conservation

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1. Amphidromy is the most prevalent type of diadromous migration. Despite this, the conservation and management of amphidromous species is exceptionally challenging because this life history type, with larval development in a pelagic habitat (usually marine) and adult development in fresh water, is poorly resolved.2. The chronological properties of otoliths, together with a spatial and temporal analysis of post-larval migration traits and adult reproductive traits, were used to reconstruct the life history of a widespread, yet declining amphidromous galaxiid, Galaxias maculatus, and to explore relationships between marine and freshwater life phases.3. A wide range of post-larval migration traits were observed over the peak migratory period. Post-larvae were smaller and younger at inward migration late in the migration season (November) and were derived from winter spawning events.Earlier migrants (September) were larger, older and derived from autumn spawning events.4. Age estimates confirmed that G. maculatus is largely an annual species, but backcalculated hatch dates showed that spawning times are more extensive than previously known.5. Growth reconstructions revealed that winter-hatched larvae were faster growing during marine and freshwater life and attained sexual maturity at a younger age than autumn-hatched fish. However, no differences in body size or reproductive investment were detected between autumn-and winter-hatched larvae.6. The first 50 days of marine growth were inter-dependent, indicating that early larval growth may be the critical link to understanding intra-and inter-annual recruitment variations of inward migrating post-larvae. Furthermore, growth after 60 days of larval life propagated through to adult freshwater development, highlighting linkages between late marine and adult freshwater life.7. This study highlights the value of studying the marine and freshwater life phases of amphidromous species in tandem. This interconnected understanding must ultimately be achieved for the conservation and management of species with this poorly understood life history type.

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“…A different number of vertebrae in G. maculatus are found between different life strategies (McDowall, 2003) and also in populations from different latitudes (McDowall, 2008). Studies carried out on the species in Tierra del Fuego are mostly referred to diadromous individuals from Arroyo Negro (AN) estuary and are related to reproduction, bioenergetics, age and growth (Boy et al, 2007;Boy et al, 2008;Boy et al, 2009;Boy et al, 2013;Rojo et al, 2018). Recent findings in Laguna Negra (LN) include the presence of larvae at preflexion and postflexion of the notochord stages in the limnetic zone (Bruno, pers.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

Rojo

Fernández

Figueroa

et al. 2020

Journal of Fish Biology

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This study reports the phenotypic and genetic differences between individuals of puyen Galaxias maculatus from two sites in the same river basin in Tierra del Fuego National Park, southern South America. Individuals from the two sampling sites presented morphometric and genetic differences. The morphometric differences indicated that individuals from Laguna Negra (LN) were short and more robust and had large eyes, whereas those from Arroyo Negro (AN) were thin and elongated and had small eyes. Genetic differences showed that AN individuals had a greater genetic structuration and an older demographic history than LN individuals. The results of this study affirmed that the individuals from the two sampling sites belong to different populations with a high degree of isolation. The demographic history could indicate that the individuals of G. maculatus which migrated to northern areas during the last glaciation settled in the Beagle Channel after its formation. The LN population could have originated after the retreat of the glaciers, migrating from AN.

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Age and growth of diadromous Galaxias maculatus (Jenyns, 1842) in southernmost South America (54° S) including contribution of age classes to reproduction

Cited by 10 publications

References 46 publications

Latitudinal Growth Variation in Young Tautogs: A Field, Laboratory, and Growing Degree‐Day Assessment of Potential Intrinsic Differences in Growth Responses to Temperature

Latitudinal Growth Variation in Young Tautogs: A Field, Laboratory, and Growing Degree‐Day Assessment of Potential Intrinsic Differences in Growth Responses to Temperature

Understanding the life histories of amphidromous fish by integrating otolith‐derived growth reconstructions, post‐larval migrations and reproductive traits

Phenotypic and genetic differentiation between diadromous and landlocked puyen Galaxias maculatus

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