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Amiya N, Nakano N, Tanaka C, Hibino S, Takakura R, Amano M, Yoshinaga T. Leptin gene expression in the brain is associated with the physiological onset of estivation in western sand lance Ammodytes japonicus. JOURNAL OF EXPERIMENTAL ZOOLOGY. PART A, ECOLOGICAL AND INTEGRATIVE PHYSIOLOGY 2024; 341:913-924. [PMID: 38946665 DOI: 10.1002/jez.2850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 06/15/2024] [Accepted: 06/19/2024] [Indexed: 07/02/2024]
Abstract
Dormancy is an essential ecological characteristic for the survival of organisms that experience harsh environments. Although factors that initiate dormancy vary, suppression or cessation of feeding activities are common among taxa. To distinguish between extrinsic and intrinsic causes of metabolic reduction, we focused on estivation, which occurs in summer when the feeding activity is generally enhanced. Sand lances (genus Ammodytes) are a unique marine fish with a long estivation period from early summer to late autumn. In the present study, we aimed to elucidate the control mechanisms of estivation in western sand lance (A. japonicus), and firstly examined behavioral changes in 8 months including a transition between active and dormant phases. We found that swimming/feeding behavior gradually decreased from June, and completely disappeared by late August, indicating all individuals had entered estivation. Next, we focused on leptin, known as a feeding suppression hormone in various organisms, and examined leptin-A gene (AjLepA) expression in the brain that may regulate the seasonal behavioral pattern. AjLepA expression decreased after 7 days of fasting, suggesting that leptin has a function to regulate feeding in this species. The monthly expression dynamics of AjLepA during the feeding (active) and non-feeding (estivation) periods showed that the levels gradually increased with the onset of estivation and reached its peak when all the experimental fish had estivated. The present study suggests that the suppression of feeding activity by leptin causes shift in the physiological modes of A. japonicus before estivation.
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Affiliation(s)
- Noriko Amiya
- School of Marine Biosciences, Kitasato University, Kanagawa, Japan
| | - Nayu Nakano
- School of Marine Biosciences, Kitasato University, Kanagawa, Japan
| | - Chikaya Tanaka
- Department of Biology, Tokyo Medical University, Tokyo, Japan
| | - Shizuha Hibino
- School of Marine Biosciences, Kitasato University, Kanagawa, Japan
| | - Ryota Takakura
- Fisheries Technology Institute, Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries, Hyogo, Japan
| | - Masafumi Amano
- School of Marine Biosciences, Kitasato University, Kanagawa, Japan
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Hibino S, Amiya N, Miyazaki Y, Nakano N, Yoneda M, Amano M, Yoshinaga T. Changes in Behavior and Diel Melatonin Secretion Toward Estivation in Western Sand Lance, Ammodytes japonicus (Uranoscopiformes, Ammodytidae). Zoolog Sci 2024; 41:245-250. [PMID: 38809862 DOI: 10.2108/zs230105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 02/07/2024] [Indexed: 05/31/2024]
Abstract
Western sand lance, Ammodytes japonicus, is known to have an estivation period, in which they cease feeding and stay in the sand from early summer to late autumn, followed by gonadal maturation. During the feeding period prior to estivation, they swim in daytime and spend the night in the sand. Before they start swimming, they show a typical behavior of head-exposing from the sand, which is likely to be related to foraging and predation avoidance. Our previous study revealed that melatonin regulates such diel behavior of this species. To elucidate the mechanisms of behavioral regulation throughout the life cycle of this sand lance, the present study examined the changes in behavior and melatonin secretion toward the estivation period. Both head-exposing and swimming behaviors were frequently observed at the transition period toward estivation. On the other hand, occurrence of these behaviors was suppressed just before entering estivation. Subsequently, it was found that plasma melatonin concentration was about three times higher at night than in daytime in the non-estivation period, while it was retained at high levels throughout the day in the estivation period. These results indicate that diurnal swimming behavior of sand lance from the feeding to estivation periods is associated with the daily cycle of melatonin secretion.
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Affiliation(s)
- Shizuha Hibino
- Graduate School of Marine Biosciences, Kitasato University, Kanagawa 252-0373, Japan
| | - Noriko Amiya
- Graduate School of Marine Biosciences, Kitasato University, Kanagawa 252-0373, Japan,
| | - Yoshiya Miyazaki
- Graduate School of Marine Biosciences, Kitasato University, Kanagawa 252-0373, Japan
| | - Nayu Nakano
- Graduate School of Marine Biosciences, Kitasato University, Kanagawa 252-0373, Japan
| | - Michio Yoneda
- Hakatajima Field Station, National Research Institute of Fisheries and Environment of Inland Sea, Japan Fisheries Research and Education Agency, Ehime 794-2305, Japan
| | - Masafumi Amano
- Graduate School of Marine Biosciences, Kitasato University, Kanagawa 252-0373, Japan
| | - Tatsuki Yoshinaga
- Graduate School of Marine Biosciences, Kitasato University, Kanagawa 252-0373, Japan
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Marciano A, Colpo KD, Boy CC, López Greco LS. Female energy dynamics in the southernmost fiddler crab: Mixed breeding strategy in Leptuca uruguayensis. ZOOLOGY 2022; 154:126041. [PMID: 35994874 DOI: 10.1016/j.zool.2022.126041] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 07/12/2022] [Accepted: 08/11/2022] [Indexed: 10/15/2022]
Abstract
At the south of its geographical distribution, the fiddler crab Leptuca uruguayensis shows two population spawning events, with more than 65 % of the females being ovigerous. The aim of this study was to assess the energy dynamics in L. uruguayensis females to estimate how they mix the capital and the income breeding strategies in the first and second spawns of the short reproductive season. The relationship between the hepatosomatic (HIS) and gonadosomatic (GSI) indices was used to assess the contribution of the hepatopancreas to ovary maturation, as indicative of the capital breeding strategy, whereas the feeding rate and the energy available in the food resource (sediment) were estimated to assess the importance of energy intake in ovary maturation, as indicative of the income breeding strategy. Before the first spawn, a significant negative relationship between the HSI and GSI (p < 0.001) and an increase of 28.2 % in the feeding rate were recorded. This suggests that the first spawn was mainly supported by energy reserves in the hepatopancreas, indicating that females used mostly the capital breeding strategy. After the first spawn, total lipid content in the hepatopancreas decreased by 33 %. On the days before the second spawn, the relationship between the HSI and GSI showed a negative but not significant (p = 0.125) trend, whereas the feeding rate increased even more. This suggests that the intense feeding activity provided the most important energetic source for ovary re-maturation, indicating that females used mostly the income breeding strategy. Also, in the second spawn, the GSI was 24.1% smaller, a fact that affected female fecundity and weight of the egg clutches, which were respectively 12 % and 11 % lower than in the first spawn. However, the energy supply allocated to each embryo was equivalent in both spawns. This study shows how L. uruguayensis females mixed the capital and income breeding strategies to take advantage of all available resources to produce two spawns in a short reproductive season.
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Affiliation(s)
- Agustina Marciano
- Universidad de Buenos Aires, CONICET, Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Laboratorio de Biología de la Reproducción y el Crecimiento de Crustáceos Decápodos, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina
| | - Karine Delevati Colpo
- Instituto de Limnología Dr. Raúl A. Ringuelet, CONICET, Universidad Nacional de La Plata, Boulevard 120 and 60, La Plata 1900, Argentina
| | - Claudia Clementina Boy
- Centro Austral de Investigaciones Científicas (CADIC), CONICET, Laboratorio de Ecología, Fisiología y Evolución de Organismos Acuáticos, B. Houssay 200, Ushuaia, Tierra del Fuego V9410BFD, Argentina
| | - Laura Susana López Greco
- Universidad de Buenos Aires, CONICET, Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Laboratorio de Biología de la Reproducción y el Crecimiento de Crustáceos Decápodos, Ciudad Universitaria, Buenos Aires C1428EGA, Argentina.
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Kolonin AM, Bókony V, Bonner TH, Zúñiga-Vega JJ, Aspbury AS, Guzman A, Molina R, Calvillo P, Gabor CR. Coping with urban habitats via glucocorticoid regulation: physiology, behavior, and life history in stream fishes. Integr Comp Biol 2022; 62:90-103. [PMID: 35026022 DOI: 10.1093/icb/icac002] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
As environments become urbanized, tolerant species become more prevalent. The physiological, behavioral and life-history mechanisms associated with the success of such species in urbanized habitats are not well understood, especially in freshwater ecosystems. Here we examined the glucocorticoid (GC) profiles, life-history traits, and behavior of two species of fish across a gradient of urbanization to understand coping capacity and associated trade-offs. We studied the tolerant live-bearing Western Mosquitofish (Gambusia affinis) for two years and the slightly less tolerant, egg-laying, Blacktail Shiner (Cyprinella venusta) for one year. We used a water-borne hormone method to examine baseline, stress-induced, and recovery cortisol release rates across six streams with differing degrees of urbanization. We also measured life-history traits related to reproduction, and for G. affinis, we measured shoaling behavior and individual activity in a novel arena. Both species showed a trend for reduced stress responsiveness in more urbanized streams, accompanied by higher reproductive output. Although not all populations fit this trend, these results suggest that GC suppression may be adaptive for coping with urban habitats. In G. affinis, GC recovery increased with urbanization, and individuals with the lowest stress response and highest recovery had the greatest reproductive allotment, suggesting that rapid return to baseline GC levels is also an important coping mechanism. In G. affinis, urban populations showed altered life-history trade-offs whereas behavioral traits did not vary systematically with urbanization. Thus, these tolerant species of fish may cope with anthropogenically modified streams by altering their GC profiles and life-history trade-offs. These results contribute to understanding the mechanisms driving species-specific adaptations and thereby community structure in freshwater systems associated with land-use converted areas.
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Affiliation(s)
- Arseniy M Kolonin
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA
| | - Veronika Bókony
- Lendület Evolutionary Ecology Research Group, Plant Protection Institute, Centre for Agricultural Research, Eötvös Loránd Research Network, Herman Ottó út 15, 1022 Budapest, Hungary
| | - Timothy H Bonner
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA
| | - J Jaime Zúñiga-Vega
- Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, Cuidad Universitaria 04510, Distrito Federal, Mexico
| | - Andrea S Aspbury
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA
| | - Alex Guzman
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA
| | - Roberto Molina
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA
| | - Pilo Calvillo
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA
| | - Caitlin R Gabor
- Department of Biology, Texas State University, 601 University Drive, San Marcos, TX 78666USA.,The Xiphophorus Genetic Stock Center, Texas State University, 601 University Drive, San Marcos, TX 78666, USA
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Henriksen O, Rindorf A, Mosegaard H, Payne MR, van Deurs M. Get up early: Revealing behavioral responses of sandeel to ocean warming using commercial catch data. Ecol Evol 2021; 11:16786-16805. [PMID: 34938473 PMCID: PMC8668760 DOI: 10.1002/ece3.8310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 09/28/2021] [Accepted: 10/05/2021] [Indexed: 11/26/2022] Open
Abstract
Warming of the oceans and shifts in the timing of annual key events are likely to cause behavioral changes in species showing a high degree of site fidelity. While this is well studied in terrestrial systems, there are fewer examples from the marine environment. Sandeel (Ammodytes marinus) is a small eel-shaped teleost fish with strong behavioral attachment to sandy habitats in which they are buried from late summer through winter. When spring arrives, the sandeel emerge to feed during the day for several of months before returning to the sand for overwintering refuge.Using fisheries data from the North Sea, we investigated whether catch rates reflect the timing of emergence and if seasonal patterns are related to temperature and primary production.Catch per unit effort (CPUE) was used to describe sandeel emergence. We developed indicators of the relative timing of the emergence from the winter sand refuge and the subsequent growth period. Different modeling approaches were used to investigate the relationship with bottom temperature and primary production.Variation in emergence behavior was correlated with variation in sea bottom temperature. Warmer years were characterized by earlier emergence. Significant warming over the last three decades was evident in all sandeel habitats in the North Sea throughout most of their adult life history, though no net shift in the phenology of emergence was detected. Minimum temperature during spring was a better predictor of emergence behavior than, for example, degree days.This study emphasizes how temperature-induced changes in behavior may have implications for predators and fisheries of sandeel. The method can be applied to other species for which the timing of exploitation (i.e., fisheries) and species life history are well matched.
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Affiliation(s)
- Ole Henriksen
- National Institute for Aquatic ResourcesTechnical University of DenmarkKgs LyngbyDenmark
| | - Anna Rindorf
- National Institute for Aquatic ResourcesTechnical University of DenmarkKgs LyngbyDenmark
| | - Henrik Mosegaard
- National Institute for Aquatic ResourcesTechnical University of DenmarkKgs LyngbyDenmark
| | - Mark R. Payne
- National Institute for Aquatic ResourcesTechnical University of DenmarkKgs LyngbyDenmark
| | - Mikael van Deurs
- National Institute for Aquatic ResourcesTechnical University of DenmarkKgs LyngbyDenmark
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White BE, McIntosh AR, Febria CM, Warburton HJ. The potential role of biotic interactions in stream restoration. Restor Ecol 2021. [DOI: 10.1111/rec.13396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bridget E. White
- School of Biological Sciences University of Canterbury – Te Whare Wānanga o Waitaha Private Bag 4800 Christchurch 8140 New Zealand
| | - Angus R. McIntosh
- School of Biological Sciences University of Canterbury – Te Whare Wānanga o Waitaha Private Bag 4800 Christchurch 8140 New Zealand
| | - Catherine M. Febria
- Great Lakes Institute for Environmental Research University of Windsor 2990 Riverside Dr. W. Windsor ON N9C 1A2 Canada
| | - Helen J. Warburton
- School of Biological Sciences University of Canterbury – Te Whare Wānanga o Waitaha Private Bag 4800 Christchurch 8140 New Zealand
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