David Nusbaumer

David Nusbaumer
University of Lausanne | UNIL · Department of Ecology and Evolution

PhD in Life Sciences

About

16
Publications
1,229
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65
Citations
Introduction
Physiology, behaviour, ecology, and their mutual interactions are my favourite research interests. I like multidisciplinary approaches as I think they allow to better embrace the complexity of a problem at hand. During my master thesis, I investigated the immune and stress response of a reef fish to a common ectoparasite because this interaction underlies one of the most studied cleaning mutualisms and is a textbook example of cooperation. Currently, I am working with two salmonid species found in Switzerland: the grayling Thymallus thymallus and the brown trout Salmo trutta. My main research topic focuses on sperm characteristics and their link with several life history traits like reproductive tactics, ornamentation, and offspring performance. I’m also working on a project investigating
Additional affiliations
September 2011 - October 2013
Université de Neuchâtel
Position
  • Master's Student

Publications

Publications (16)
Article
Full-text available
Salmonids are a socioeconomically and ecologically important group of fish that are often managed by stocking. Little is known about potential sex-specific effects of stocking, but recent studies found that the sexes differ in their stress tolerances already at late embryonic stage, i.e., before hatchery-born larvae are released into the wild and l...
Preprint
Mating is rarely random in nature, but the effects of mate selection on offspring performance are still poorly understood, even in well-established models such as salmonid fish. We sampled wild lake char (Salvelinus umbla) and used their gametes to investigate the genetic consequences of different mating scenarios. In a first study, we used full-fa...
Article
Full-text available
Salmonid fish have become important models in evolution and ecology, but possible effects of embryo or larval sex are mostly ignored, probably because morphological gonad formation starts only months after hatching and sexual maturation years later. However, recent gene expression studies and first observations in domestic strains suggest that sex-...
Preprint
Fish often spawn eggs with ovarian fluids that have been hypothesized to support sperm of some males over others (cryptic female choice). Alternatively, sperm reactions to ovarian fluids could reveal male strategies linked to their likely roles during spawning. Sperm of males who would usually be close to females during spawning are then expected t...
Article
Full-text available
Pesticides are often toxic to nontarget organisms, especially to those living in rivers that drain agricultural land. The brown trout (Salmo trutta) is a keystone species in many such rivers, and natural populations have hence been chronically exposed to pesticides over multiple generations. The introduction of pesticides decades ago could have ind...
Article
Full-text available
In many mutualisms, benefits in the form of food are exchanged for services such as transport or protection. In the marine cleaning mutualism, a variety of “client” reef fishes offer “cleaner” fish Labroides dimidiatus access to food in the form of their ectoparasites, where parasite removal supposedly protects the clients. Yet, the health benefits...
Article
Sperm cryopreservation is routinely used in reproductive medicine, livestock production and wildlife management. Its effect on offspring performance is often assumed to be negligible, but this still remains to be confirmed in well-controlled within-subject experiments. We use a vertebrate model that allows us to experimentally separate parental and...
Article
Full-text available
One of the most common and potent pollutants of freshwater habitats is 17‐alpha‐ethynylestradiol (EE2), a synthetic component of oral contraceptives that is not completely eliminated during sewage treatment and that threatens natural populations of fish. Previous studies found additive genetic variance for the tolerance against EE2 in different sal...
Poster
The persistence of threatened populations may often depend on additive genetic variance for tolerance to anthropogenic stress. Among the most relevant modern stress factors in freshwater habitats are pesticides. Here, we tested whether brown trout from different populations showed additive genetic variance in the tolerance to two common pesticides....
Preprint
The potential importance of sperm cryopreservation for aquaculture and conservation management seems still undervalued, probably because the available protocols often lead to reduced fertilization success. We experimentally compared the effectiveness of two different freezing extenders for cryopreservation of brown trout ( Salmo trutta) semen, cont...
Article
Full-text available
Life-history theory predicts that iteroparous females allocate their resources differently among different breeding seasons depending on their residual reproductive value. In iteroparous salmonids there is typically much variation in egg size, egg number, and in the compounds that females allocate to their clutch. These compounds include various ca...
Article
Endocrine disrupting chemicals are a threat to natural fish populations in the aquatic environment. Their toxicity is usually discussed relative to concentrations in the water the fish are exposed to. In the case of the synthetic compound 17-alpha-ethynylestradiol (EE2), a common and persistent estrogen, concentrations around 1 ng/L have repeatedly...
Preprint
Endocrine disrupting chemicals are a threat to natural fish populations in the aquatic environment. Their toxicity is usually discussed relative to concentrations in the water the fish are exposed to. In the case of the synthetic compound 17-alpha-ethynylestradiol (EE2), a common and persistent estrogen, concentrations around 1 ng/L have repeatedly...
Article
Full-text available
The relationships among animal form, function and performance are complex, and vary across environments. Therefore, it can be difficult to identify morphological and/or physiological traits responsible for enhancing performance in a given habitat. In fishes, differences in swimming performance across water flow gradients are related to morphologica...

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