| 1. |
- Ah-King, Malin, 1973-, et al.
(författare)
-
The influence of territoriality and mating system for the evolution of male care, a phylogenetic study on fish
- 2005
-
Ingår i: Journal of Evolutionary Biology. - 1010-061X .- 1420-9101.
-
Tidskriftsartikel (refereegranskat)abstract
- Evolution of male care is still poorly understood. Using phylogeneticallymatched-pairs comparisons we tested for effects of territoriality and matingsystem on male care evolution in fish. All origins of male care were found inpair-spawning species (with or without additional males such as sneakers) andnone were found in group-spawning species. However, excluding groupspawners, male care originated equally often in pair-spawning species withadditional males as in strict pair-spawning species. Evolution of male care wasalso significantly related to territoriality. Yet, most pair-spawning taxa withmale care are also territorial, making their relative influence difficult toseparate. Furthermore, territoriality also occurs in group-spawning species.Hence, territoriality is not sufficient for male care to evolve. Rather, we arguethat it is the combination of territoriality and pair spawning with sequentialpolygyny that favours the evolution of male care, and we discuss our results inrelation to paternity assurance and sexual selection.
|
|
| 2. |
- Ah-King, M., et al.
(författare)
-
The influence of territoriality and mating system on the evolution of male care: a phylogenetic study on fish.
- 2005
-
Ingår i: Journal of Evolutionary Biology. - : Wiley. - 1010-061X .- 1420-9101. ; 18:2, s. 371-382
-
Tidskriftsartikel (refereegranskat)abstract
- Evolution of male care is still poorly understood. Using phylogenetically matched-pairs comparisons we tested for effects of territoriality and mating system on male care evolution in fish. All origins of male care were found in pair-spawning species (with or without additional males such as sneakers) and none were found in group-spawning species. However, excluding group spawners, male care originated equally often in pair-spawning species with additional males as in strict pair-spawning species. Evolution of male care was also significantly related to territoriality. Yet, most pair-spawning taxa with male care are also territorial, making their relative influence difficult to separate. Furthermore, territoriality also occurs in group-spawning species. Hence, territoriality is not sufficient for male care to evolve. Rather, we argue that it is the combination of territoriality and pair spawning with sequential polygyny that favours the evolution of male care, and we discuss our results in relation to paternity assurance and sexual selection.
|
|
| 3. |
- Ah-King, M., et al.
(författare)
-
Why is there no sperm competition in a pipefish with externally brooding males? Insights from sperm activation and morphology
- 2006
-
Ingår i: Journal of Fish Biology. - : Wiley. - 0022-1112 .- 1095-8649. ; 68:3, s. 958-962
-
Tidskriftsartikel (refereegranskat)abstract
- Nerophis ophidion sperm activation and morphology were investigated with the aim of explaining the apparent lack of sperm competition in this syngnathid with externally brooding males. Nerophis ophidion sperm were activated by a mixture of ovarian fluid and sea water, but not by sea water alone. This indicated that sperm were not shed into the water but needed to be released near the eggs, which probably restrained sperm competition. (c) 2006 The Fisheries Society of the British Isles.
|
|
| 4. |
- Ahnesjö, Ingrid, et al.
(författare)
-
En beteende-ekologisk forskningsperiod på Klubbans biologiska station : Rapport från återträff med Doktorer som disputerade (1983-2001) på avhandlingar med fältarbete på Klubbans Biologiska station. I en värld av kantnålar, stubbar, spiggar och nudingar.
- 2018
-
Rapport (populärvet., debatt m.m.)abstract
- We had the fortune as PhD-students and scientists in Animal Ecology at Uppsala University, to spend joyful and creative field work summers at Klubban Biological Station, during the 1980-90’s. A reunion in June 2018 resulted in this report highlighting research on pipefishes, gobies, sticklebacks and nudibranchs. Our research on these animals have provided novel insights and knowledge of the process of sexual selection and paternal care. These animals have, in many aspects, now become model organisms in evolutionary behavioral ecology in marine environments. Our list of publications provides many examples of how environmental factors influence how sexual selection and mate choice operate, how predictors like potential reproductive rates, operational sex ratios work and how male parental care is prominent in influencing selection. This research, that started at Klubban, has broadened our understanding of the ecological importance of shallow marine areas. The evolutionary understanding of how males and females can behave and how adaptive traits are selected in interaction with social and an increasingly changing ambient environment is in focus in our continued scientific endeavors. We have happily compiled this report illustrating how science and scientist can stimulate each other at a wonderful place like Klubban Biological Station, with the access to amazing organisms like pipefishes, gobies, sticklebacks and nudibranchs.
|
|
| 5. |
- Ahnesjö, Ingrid, et al.
(författare)
-
Obituary : Staffan Ulfstrand
- 2024
-
Ingår i: Behavioral Ecology. - : Oxford University Press. - 1045-2249 .- 1465-7279. ; 35:1
-
Tidskriftsartikel (populärvet., debatt m.m.)
|
|
| 6. |
- Ahnesjö, Ingrid, et al.
(författare)
-
Variation in sexual selection in fishes
- 2008
-
Ingår i: Fish Behaviour (Eds. Magnhagen, C., Braithwaite, V. A., Forsgren, E. & B. G. Kapoor). - Enfield, N.H. : Science Publishers (USA). - 9781578084357
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)
|
|
| 7. |
- Andrén, Maria Norevik, 1970, et al.
(författare)
-
Filial cannibalism in a nest-guarding fish: females prefer to spawn in nests with few eggs over many
- 2014
-
Ingår i: Behavioral Ecology and Sociobiology. - : Springer Science and Business Media LLC. - 0340-5443 .- 1432-0762. ; 68:10, s. 1565-1576
-
Tidskriftsartikel (refereegranskat)abstract
- In fish, fecundity correlates with female body size and egg-tending males often eat small broods. Therefore, small females may prefer to spawn in nests that already contain many eggs, to ensure the brood is as large as possible. In contrast, large females may prefer nests with few eggs, if high egg number or density has a negative effect on egg survival, or if there are drawbacks of spawning last in a nest. To test the hypothesis that female body size affects nest (and male mate) choice, using the sand goby (Pomatoschistus minutus), we allowed small and large females to choose between two males that were matched in size—one guarding a small clutch and the other a large clutch, respectively. We recorded where females spawned (measure of female preference), the combined brood size, male courtship, egg care and nest building. We also quantified the effect of brood size and egg density on egg survival in a separate data set. Although the combined broods did not exceed the small brood sizes that are at risk of being eaten, both small and large females preferred to spawn in nests with smaller clutch sizes. This preference could not be explained by more courtship or male parental effort, nor by reduced survival of larger or denser broods. Instead, our result might be explained by females avoiding the danger of cannibalism of young eggs by males or the risk of reduced egg health associated with being near the nest periphery.
|
|
| 8. |
- Asnicar, Davide, et al.
(författare)
-
Sand Goby : An Ecologically Relevant Species for Behavioural Ecotoxicology
- 2018
-
Ingår i: Fishes. - : MDPI. - 2410-3888. ; 3:1
-
Tidskriftsartikel (refereegranskat)abstract
- Locomotion-based behavioural endpoints have been suggested as suitable sublethal endpoints for human and environmental hazard assessment, as well as for biomonitoring applications. Larval stages of the sand goby (Pomatoschistus minutus) possess a number of attractive qualities for experimental testing that make it a promising species in behavioural ecotoxicology. Here, we present a study aimed at developing a toolkit for using the sand goby as novel species for ecotoxicological studies and using locomotion as an alternative endpoint in toxicity testing. Exposure to three contaminants (copper (Cu), di-butyl phthalate (DBP) and perfluorooctanoic acid (PFOA) was tested in the early life stages of the sand goby and the locomotion patterns of the larvae were quantified using an automatic tracking system. In a photo-motor test, sand goby larvae displayed substantially higher activity in light than in dark cycles. Furthermore, all tested compounds exerted behavioural alterations, such as hypo- and hyperactivity. Our experimental results show that sand goby larvae produce robust and quantifiable locomotive responses, which could be used within an ecotoxicological context for assessing the behavioural toxicity of environmental pollutants, with particular relevance in the Nordic region. This study thus suggests that sand goby larvae have potential as an environmentally relevant species for behavioural ecotoxicology, and as such offer an alternative to standard model species.
|
|
| 9. |
- Björk, Johannes R., et al.
(författare)
-
Mechanisms behind size-assortative nest choice by sand goby males in absence of intrasexual competition
- 2012
-
Ingår i: Animal Behaviour. - : Elsevier BV. - 0003-3472 .- 1095-8282. ; 83:1, s. 55-62
-
Tidskriftsartikel (refereegranskat)abstract
- Among nest-holding !sh, males often choose nest sites according to their own body size (i.e. size-assortative nest choice). In most cases, this can be explained by intrasexual competition. However, a few studies, for example on a marine population of the sand goby, Pomatoschistus minutus, have found a size-assortative nest preference, even when intrasexual competition is excluded. We conducted three aquarium experiments, using small sand goby males (47e54 mm) that were given either small (size-matched) or large (size-mismatched) nest sites, to test for potential mechanisms underlying this size-assortative nest choice in the absence of intrasexual competition. The three mechanisms investigated were (1) female preference, (2) paternal expenditure and (3) nest take-over. We did not, however, !nd any !tness advantages for sizematched males in any of the three experiments, suggesting that some other mechanism, such as defence against egg predators, is underlying this particular behaviour. Thus, further studies are needed to explain size-assortative nest choice behaviour in the sand goby.
|
|
| 10. |
- Blom, Eva-Lotta, et al.
(författare)
-
Anthropogenic noise disrupts early-life development in a fish with paternal care
- 2024
-
Ingår i: Science of the Total Environment. - 0048-9697 .- 1879-1026. ; 935
-
Tidskriftsartikel (refereegranskat)abstract
- Anthropogenic noise is a global pollutant but its potential impacts on early life-stages in fishes are largely unknown. Here, using controlled laboratory experiments, we tested for impacts of continuous or intermittent exposure to low-frequency broadband noise on early life-stages of the common goby (Pomatoschistus microps), a marine fish with exclusive paternal care. Neither continuous nor intermittent noise exposure had an effect on filial cannibalism, showing that males were capable and willing to care for their broods. However, broods reared in continuous noise covered a smaller area and contained fewer eggs than control broods. Moreover, although developmental rate was the same in all treatments, larvae reared by males in continuous noise had, on average, a smaller yolk sac at hatching than those reared in the intermittent noise and control treatments, while larvae body length did not differ. Thus, it appears that the increased consumption of the yolk sac reserve was not utilised for increased growth. This suggests that exposure to noise in early life-stages affects fitness-related traits of surviving offspring, given the crucial importance of the yolk sac reserve during the early life of pelagic larvae. More broadly, our findings highlight the wide-ranging impacts of anthropogenic noise on aquatic wildlife living in an increasingly noisy world.
|
|
