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  • 51.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment.
    Are dabbling ducks main players or merely noise in limnic ecosystems?2009In: Abstracts, 2nd Pan-European Duck Symposium, 2009, p. 25-Conference paper (Refereed)
    Abstract [en]

    For obvious reasons waterfowl ecologists consider ducks as focal organisms and main players when we study patterns and processes in wetland ecosystems. However, limnologists and fish biologists historically have ‘a bottom-up’ view of the same ecosystems, and they largely regard ducks and other waterbirds merely as ‘background noise’ much at the mercy of other and more powerful forces. Focussing on European studies of dabbling ducks I will review the evidence for and against these largely opposing views. I argue that a lot can be learned from using descriptive and pattern-oriented studies to produce explicit predictions that can be tested under more rigorous experimental circumstances. I will also explore why the lack of reliable information about annual variations in recruitment and harvest rates is a major obstacle for understanding population trajectories of dabbling duck populations. Finally, I will review the existing evidence for the major paradigms addressing population limitation in European dabbling ducks.

  • 52.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Are dabbling ducks major players or merely noise in freshwater ecosystems?: a European perspective, with references to population limitation and density dependence2009In: Wildfowl, ISSN 0954-6324, E-ISSN 2052-6458, no Special issue 2, p. 9-23Article in journal (Refereed)
    Abstract [en]

    Waterfowl ecologists consider ducks important players in patterns and processes of freshwater ecosystems. Limnologists and fish biologists, on the other hand, historically have “a bottom-up” view of the same systems, often regarding waterbirds as “background noise” compared to other biotic influences. Evidence for and against these largely opposing views is reviewed, focussing on European dabbling duck studies. In oligo- and mesotrophic wetlands at low breeding density, their role is likely to be overshadowed by biotic interactions between fish, invertebrates and plants. Conversely, many other freshwater systems may be affected by dabbling ducks in various ways, acting as dispersers of invertebrates and plants, as predators, and as eutrophicators. It is concluded that dabbling ducks affect freshwater systems more profoundly than has hitherto been acknowledged. In their turn, freshwater ecosystems affect the ducks’ population ecology. In a less comprehensive treatment, the evidence for the major paradigms addressing population limitation in dabbling ducks is discussed briefly from a European perspective. It is concluded that top-down (predation) as well as bottom-up (food limitation) processes may both affect population size, but evidence for either is correlative, necessitating more experimental studies based on explicit predictions from pattern-oriented studies. In a discussion of the prospects for adopting a more adaptive management approach for European dabbling ducks, it is argued that a lack of information about annual variation in recruitment and harvest rates are major obstacles to understanding population change and for adopting a more adaptive management. A compilation of European studies about density dependence in Mallard Anas platyrhynchos indicates that population regulation may be a common phenomenon in this species, with possible important ramifications for research as well as management programmes.

  • 53.
    Elmberg, Johan
    Kristianstad University, Research environment Man & Biosphere Health (MABH). Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Att samsas om gäss - visar Vattenriket vägen?2015In: Vattenriket i fokus, ISSN 1653-9338, no 4, p. 12-15Article in journal (Other academic)
  • 54.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Att ta plats på en angelägen arena2007In: Sarah, Vol. 5, no 1, p. 3-Article in journal (Other (popular science, discussion, etc.))
  • 55.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Bergand2007Other (Other academic)
  • 56.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Bergand2007Other (Other academic)
  • 57.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Bra häckningsår för finska vitryggar2003In: Vår fågelvärld, ISSN 0042-2649, Vol. 62, no 5, p. 30-Article in journal (Other (popular science, discussion, etc.))
  • 58.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Brånsjön - mer speciell än du tror!2006In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 31, no 1, p. 14-17Article in journal (Other (popular science, discussion, etc.))
  • 59.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Conservation biology and behaviour: from frog perspective to a bird´s eye view2014In: 10th Ecology & Behaviour meeting, Montpellier, Frankrike, 12-16/5, 2014: program and abstracts, 2014, p. 37-Conference paper (Refereed)
    Abstract [en]

    My plenary will explore the historical and ecological roots of the subdisciplines ≪conservation biology≫ and ≪behavioural ecology≫, which together make up the backbone of this session. Based on arguments about moral and factual necessities to halt biodiversity loss, I will discuss why, how and to what extent conservation biology and behavioural ecology have come to merge. I will highlight how this has affected conservation efforts in a variety of contexts and geographic settings. In doing so, most of my examples of successful integration between these research fields concern amphibians, reptiles and birds, spanning a wide range of spatial and temporal scales. My emphasis will be more on the conceptual cross-fertilization between the research fields than on the technical development permitting it. Rapid deterioration and reduction of natural habitats crucial for upholding biodiversity provides a backdrop for an analysis of research needs and a horizon scan of further integration of conservation and the study of animal behavior.

  • 60.
    Elmberg, Johan
    Department of Wildlife Ecology, Swedish University of Agricultural Sciences, Umeå.
    Cooperative nest defense by trios of Arctic Skuas Stercorarius parasiticus1992In: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 134, no 3, p. 298-298Article in journal (Refereed)
  • 61.
    Elmberg, Johan
    Kristianstad University, Department of Mathematics and Science.
    Density-dependent breeding success in mallards Anas platyrhynchos on a eutrophic lake2003In: Wildlife Biology, ISSN 0909-6396, E-ISSN 1903-220X, Vol. 9, no 1, p. 67-73Article in journal (Refereed)
    Abstract [en]

    Census data from a eutrophic lake collected in 1987-1999 were used to study nesting and breeding success in mallards Anas platyrhynchos. In each year there were 6-19 pair counts and 13-34 brood counts. The maximum combined count of single males and pairs (i.e. on any day in any of three census periods in May) provided the best fit with subsequent estimates of breeding success. Nesting success (average brood:pair ratio = 0.52), brood size of older ducklings (mean = 5.7) as well as fledgling success (2.86 juveniles per nesting pair) were higher than in many previous mallard studies. Per capita brood production as well as per capita fledgling production was negatively density dependent, but the latter was not statistically independent of the former. There was no correlation between per capita fledgling success and duckling mortality on a year-by-year basis, hence the density-dependent pattern in breeding success appears to be mediated through variation in nesting success. The number of paired females at the start of the breeding season correlated positively with the production of fledged juveniles the year before.

  • 62.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment.
    Det lönar sig att häcka tidigt och inte för trångt2012In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 37, no 1, p. 4-9Article in journal (Other (popular science, discussion, etc.))
  • 63.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Ecology and natural history of the moor frog (Rana arvalis) in boreal Sweden2008In: Journal of field herpetology, no Supplement 13, p. 179-194Article in journal (Refereed)
  • 64.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Ecosystem services provided by seabirds: what projections can we make from waterbirds in general?2015In: 2nd World Seabird Conference: seabirds: Global ocean sentinels, 2015Conference paper (Refereed)
    Abstract [en]

    To facilitate conservation efforts and wise-use decisions about marine resource use there is an urgent need to further the understanding of what ecosystem services are provided by true seabirds, and to establish methodologies for quantifying the values of these services. Recent reviews address ecosystem services for birds in general (Wenny et al 2011) and for waterbirds (Green & Elmberg 2014), but such analyses are still much needed for the true seabirds. I will use insights from previous general reviews to outline research needs, shortcuts, generalities, projections, and pitfalls in the study of ecosystem services in true seabirds. In doing so, I will contrast previous knowledge and current knowledge gaps with characteristics unique for many seabirds, e.g. small population size, highly localized (vulnerable) breeding sites, extreme mobility, K-selected life histories, bycatch mortality and methodological problems associated with studying them.

  • 65.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    En punktinsats för nya fågelupplevelser eller Fågelskådning på nya vägar2005In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 30, no 3, p. 9-11Article in journal (Other (popular science, discussion, etc.))
  • 66.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment.
    Ett farväl till den linnéanska liturgins sista officianter2011In: Glänta, ISSN 1104-5205, no 1, p. 110-114Article in journal (Other (popular science, discussion, etc.))
  • 67.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Expertutlåtande om drakar2008In: Dagens Nyheter, ISSN 1101-2447, Vol. 08-01Article in journal (Other (popular science, discussion, etc.))
  • 68.
    Elmberg, Johan
    Department of Animal Ecology, University of Umeå.
    Factors affecting male yearly mating success in the common frog, Rana temporaria1991In: Behavioral Ecology and Sociobiology, ISSN 0340-5443, E-ISSN 1432-0762, 10.1007/BF00180989, Vol. 28, no 2, p. 125-131Article in journal (Refereed)
    Abstract [en]

    The mating behavior of the European common frog, Rana temporaria, was studied experimentally. Female body length was correlated with body mass as well as with fecundity. However, males showed no mating preference with regard to either female body length, body mass, or fecundity. In successive multiple matings, male readiness to re-mate as well as fertilization success did not vary among the first four matings. Further, fertilization success was not correlated with either the number of days since the previous fertilization, water volume in the experimental container, testes mass, female/male body length ratio, or female fecundity. However, there was a positive correlation between fertilization success and male fat reserve status. Sexual competition and mating patterns were studied in tanks in which operational sex ratio (OSR) and male density were manipulated, and time for sexual competition was allowed to vary. Successful take-overs and nonrandom mating (large male advantage) were observed only at a combination of a four-fold male bias in OSR and an unnaturally high male density (30-50/m2). I argue that in natural populations of Rana temporaria: (1) There is considerable intraspecific variation in the opportunity for sexual competition, (2) OSR influences mating pattern more than male density and time (duration of the prespawning period), and (3) nonrandom mating should be rare.

  • 69.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Felbestämd korsnäbb2007In: Vår fågelvärld, ISSN 0042-2649, Vol. 66, no 3, p. 36-Article in journal (Other (popular science, discussion, etc.))
  • 70.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Fortsatt uppåt för vitryggen i Finland2008In: Vår fågelvärld, ISSN 0042-2649, Vol. 67, no 2, p. 34-Article in journal (Other (popular science, discussion, etc.))
  • 71.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment.
    Gräsänder klarar av klimatförändringar2012In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 37, no 1, p. 14-18Article in journal (Other (popular science, discussion, etc.))
  • 72.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Hur livat är det i holken egentligen?: en smula populationsekologi för knipor och holkuppsättare2002In: Vår fågelvärld, ISSN 0042-2649, Vol. 61, no 7, p. 28-29Article in journal (Other (popular science, discussion, etc.))
  • 73.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Hur lärkfalken vred min sverigekarta rätt2005In: Vår fågelvärld, ISSN 0042-2649, Vol. 64, no 8, p. 20-23Article in journal (Other (popular science, discussion, etc.))
  • 74.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment.
    Inköpta ägg hotar gräsanden2012In: Forskning & Framsteg, ISSN 0015-7937, no 3, p. 26-29Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Vad händer med inhemska arter när de vilda bestånden hela tiden fylls på med individer som är uppfödda i fångenskap och som kanske inte är anpassade till vår miljö?

  • 75.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment.
    Jaktbara svenska fågelarters utveckling under 50 år2009Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Sveriges fågelfauna förändras hela tiden. Bara under de senaste femtio åren har flera nya arter etablerat fasta bestånd, medan andra har försvunnit. Dessutom visar många av de sedan länge bofasta arterna stora förändringar i antal under samma tid. Ökningar och minskningar påverkar arternas popularitet som jaktbyte, men det gör också förändringar i attityder och lagstiftning. Syftet med faktabladet är att ge en översikt av de nu jaktbara svenska fågelarternas utveckling under det senaste halvseklet, både vad gäller avskjutning och bestånd i stort.

  • 76.
    Elmberg, Johan
    SLU.
    Kraxig konstellation kontrar konstiga kombinationer2000In: Anser, ISSN 0347-9595, Vol. 39, no 1, p. 53-54Article in journal (Other (popular science, discussion, etc.))
  • 77.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Forskningsmiljön Man and Biosphere Health (MABH).
    Lever elfenbensnäbben?2013In: Vår fågelvärld, ISSN 0042-2649, Vol. 72, no 2, p. 8-Article in journal (Other academic)
  • 78.
    Elmberg, Johan
    Department of Animal Ecology, University of Umeå.
    Long-term survival, length of breeding season, and operational sex ratio in a boreal population of common frogs, Rana temporaria L.1990In: Canadian Journal of Zoology, ISSN 0008-4301, E-ISSN 1480-3283, Vol. 68, no 1, p. 121-127Article in journal (Refereed)
    Abstract [en]

    A population of individually marked adult Rana temporaria was studied during the breeding season in 1979–1988 in east-central Sweden. Annual return rate averaged 31% (range 16–51%) in males and 16% (range 5–33%) in females. Return rate was not size dependent but increased with every successful previous hibernation, indicating an increased survival rate with age. Return rate was not correlated with winter harshness. Once adult, males had on average 1.5 (maximum 6) seasons with the possibility of reproducing. Corresponding values for females were 1.4 and 4. Mean length of the breeding season was 20 (SD = 2) days. Calling generally started at water temperatures below 3 °C. The lowest spawning temperature was 1 °C. Average temperatures at spawning onset and peak spawning were 5 and 6 °C, respectively. Large males tended to arrive earlier at the pond than small males. Males arrived earlier and stayed longer than did females. The overall population sex ratio was close to unity. The operational sex ratio (OSR) varied during the breeding season, averaging 0.54 (one female to two males). No male was observed to mate more than once per season. I argue that survival selection is more important to male lifetime mating success than is competition in the breeding pond (sexual selection as affected by OSR and length of the breeding season).

  • 79.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Mer krut på fågelskyddet!2008In: Vår fågelvärld, ISSN 0042-2649, Vol. 67, no 2, p. 35-Article in journal (Other (popular science, discussion, etc.))
  • 80.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Forskningsmiljön Man and Biosphere Health (MABH).
    Nötskrikans vintervanor2012In: Vår fågelvärld, ISSN 0042-2649, Vol. 71, no 5, p. 12-Article in journal (Other academic)
  • 81.
    Elmberg, Johan
    Department of Animal Ecology, University of Umeå.
    Ovarian cyclicity and fecundity in boreal common frogs Rana temporaria L. along a climatic gradient1991In: Functional Ecology, ISSN 0269-8463, E-ISSN 1365-2435, Vol. 5, no 3, p. 340-350Article in journal (Refereed)
    Abstract [en]

    Hypotheses that the patterns of energy storage, ovarian development and fecundity change along a climatic gradient were tested. Data from adult female common frogs Rana temporaria L. were collected in three study areas from mixed boreal lowland forest to alpine heath. There were no consistent altitudinal trends in body length or weight. Age, however, increased with altitude. During the feeding season, the rate of primary deposition of energy in the fat bodies was higher in mid-altitude than in lowland females. Relative ovary weight increased faster in alpine heath and mid-altitude frogs than in lowland frogs. There were no indications of an ovarian resting period. Rather, with increased altitude the oocytes for next year's reproduction tended to have entered the vitellogenic growth phase even before oviposition; possibly this was an adaptation to a short feeding season. Body length and fecundity were exponentially related in the lowland and the mid-altitude study areas. The relationship between body weight and fecundity appeared to be linear in at least the lowland population. Fecundity per gram body mass increased with age. Although differences between study areas were found, there was no consistent altitudinal trend in either absolute or size-relative fecundity. Fecundity varied between years as well as between populations. A negative correlation between relative liver weight and fecundity indicated a high cost to reproduction. Nevertheless, skipping years of reproduction, a phenomenon suggested to occur primarily in resource-poor environments, was rare.

  • 82.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Punktinsats på hög nivå gav "fel" spettar2006In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 31, no 1, p. 2-3Article in journal (Other (popular science, discussion, etc.))
  • 83.
    Elmberg, Johan
    Department of Animal Ecology, University of Umeå.
    Random mating in a boreal population of European common frogs Rana temporaria L.1987In: Holarctic Ecology, ISSN 0105-9327, Vol. 10, no 3, p. 193-195Article in journal (Refereed)
  • 84.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Slätten tur och retur på 25 år2001In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 26, p. 54-57Article in journal (Other (popular science, discussion, etc.))
  • 85.
    Elmberg, Johan
    Department of Animal Ecology, Swedish University of Agricultural Sciences, Umeå.
    Song differences between North American and European White-winged Crossbills (Loxia leucoptera).1993In: The AUK: A Quarterly Journal of Ornithology, ISSN 0004-8038, E-ISSN 1938-4254, Vol. 110, no 2, p. 385-385Article in journal (Refereed)
  • 86.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Success factors behind multi-stakeholder management of geese in an agricultural landscape2016In: 7th North American Duck Symposium: waterfowl ecology and adaptive management, 2016Conference paper (Refereed)
    Abstract [en]

    On both sides of the Atlantic, geese are a major management challenge, not least because of shifting distributions, increased availability of nutritious agricultural forage, and unprecedented growth of some populations. In northwest Europe, managers face the task of devising management strategies for areas with up to 10 co-occurring goose species. These taxa range from being globally threatened to over-abundant, usually present in mixed-species assemblages whose composition change seasonally. I present a case study from a densely populated agricultural region in south Sweden where goose numbers and damage by geese on crops have increased dramatically during recent decades. A goose management group (GMG) was founded in 2002 comprising landowners, farmers, hunters, ornithologists, conservation NGOs, and local and county level administration. The GMG has autonomy to self-organize and a key point is that it has neither legal jurisdiction nor authority to make formal decisions. This makes the GMG adaptive, free to react quickly to signals from the socio-ecological system. In essence, the GMG provides a collaborative arena for sharing experiences and discussing conflicts. With time this has built trust between stakeholders so that there is no longer any disagreement over input variables such as goose numbers, bag size, and magnitude of crop damage. Further GMG success factors are its continuity over time, that it is embedded in the local community, and that some of its members also represent authorities that do have jurisdiction over hunting permits and crop damage reimbursement. This is an example of how human-wildlife conflicts can be reduced and defused by simple means. Interestingly, GMG members as well as people outside the group consider it a success even though it has not led to reduced goose numbers locally, illustrating that understanding the sociology of management conflicts is often just as important as understanding biological details of the system.

  • 87.
    Elmberg, Johan
    Institutet för Skoglig Zooekologi, Sveriges Lantbruksuniversitet, Umeå.
    Threats to boreal frogs1993In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 22, no 4, p. 254-255Article in journal (Refereed)
  • 88.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Varför sätta näbbsadelmärken på krickor?2004In: Ringinform, ISSN 1100-4134, Vol. 26, no 1, p. 38-Article in journal (Other (popular science, discussion, etc.))
  • 89.
    Elmberg, Johan
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Ärta2007Other (Other academic)
  • 90.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Andersson, Å
    Sjöberg, K
    Stjärtand2007Other (Other academic)
  • 91.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Frankrike.
    Forskare efterlyser rapporter om näbbmärkta änder2003In: Jakt och jägare, ISSN 1401-8306, Vol. 63, no 9, p. 25-Article in journal (Other (popular science, discussion, etc.))
  • 92.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Frankrike.
    Kricka från Brånsjön flyger till Wales - och lär oss mer om en ovanligt okänd vanlig fågelart2003In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 28, no 3, p. 73-74Article in journal (Other (popular science, discussion, etc.))
  • 93.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Frankrike.
    Näbbmärkta änder i nytt forskningsprojekt2003In: Svensk jakt nyheter, Vol. 8, no 5Article in journal (Other (popular science, discussion, etc.))
  • 94.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Finland.
    Guillemain, Matthieu
    Frankrike.
    Rovdjur och mat gör krickans dag till natt2007In: Vår fågelvärld, ISSN 0042-2649, Vol. 66, no 7, p. 15-17Article in journal (Other (popular science, discussion, etc.))
  • 95.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Frankrike.
    Guillemain, Matthieu
    Frankrike.
    Ändernas hemliga nattliv2008In: Svensk jakt, ISSN 0039-6583, Vol. 146, no 4, p. 274-276Article in journal (Other academic)
  • 96.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Frankrike.
    Guillemain, Matthieu
    Frankrike.
    Lepley, Michel
    Frankrike.
    Bosca, Fabrice
    Frankrike.
    Legagneux, Pierre
    Frankrike.
    Nogues, Jean-Baptiste
    Frankrike.
    Flyway patterns of food abundance in Eurasian Teal (Anas crecca crecca)2006In: Integrating science and duck management : 4th North American duck symposium and workshop, 2006, p. 52-53Conference paper (Refereed)
  • 97.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Research environment Man & Biosphere Health (MABH).
    Dessborn, Lisa
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Andungar har bra koll när faran hotar2014In: Vår fågelvärld, ISSN 0042-2649, Vol. 73, no 3, p. 34-35Article in journal (Other (popular science, discussion, etc.))
  • 98.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap. Kristianstad University, Research environment Man & Biosphere Health (MABH).
    Dessborn, Lisa
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Så undviker andungarna rovdjuren2015In: Svensk jakt, ISSN 0039-6583, Vol. 153, no 6, p. 38-40Article in journal (Other (popular science, discussion, etc.))
  • 99.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment.
    Dessborn, Lisa
    Kristianstad University, School of Education and Environment.
    Englund, G.
    Fisk och änder konkurrerar med varandra2012In: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 37, no 1, p. 19-21Article in journal (Other (popular science, discussion, etc.))
  • 100.
    Elmberg, Johan
    et al.
    Kristianstad University, School of Education and Environment.
    Dessborn, Lisa
    Kristianstad University, School of Education and Environment.
    Englund, Göran
    Department of Ecology and Environmental Science, Umeå University.
    Presence of fish affects lake use and breeding success in ducks2010In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 641, no 1, p. 215-223Article in journal (Refereed)
    Abstract [en]

    Several previous studies indicate that presence of fish has negative effects on waterbirds breeding on lakes, owing either to competition for common invertebrate prey or fish predation on ducklings/chicks. However, others have reported results to the contrary and it remains unresolved what factors trigger, inhibit, and modulate fish-waterbird interactions. The present study was designed to test the effect of fish presence per se, with a minimum of variation in possibly confounding environmental variables. Thus, after stratifying for area, depth, altitude, pH, and total phosphorus we compared 13 lakes with and 12 without fish (mainly pike Esox lucius and perch Perca fluviatilis) with respect to (i) general species richness of waterbirds, (ii) species-specific utilization and breeding success of two dabbling ducks (mallard Anas platyrhynchos and teal Anas crecca) and a diving duck (goldeneye Bucephala clangula). General species richness of waterbirds was higher on fishless lakes. Overall use (bird days) and brood number of teal and goldeneye were higher on fishless lakes. The latter also had more benthic and free-swimming prey invertebrates compared to lakes with fish. Mallard use, mallard brood number, and abundance of emerging insects did not differ between lake groups. Generalized linear models including fish presence as factor and considering seven environmental variables as covariates, confirmed that all waterbird variables except mallard days and broods were negatively correlated to fish presence. There was also a residual positive relationship of lake area on general species richness, teal days, and teal broods. Our data demonstrate a stronger effect of fish presence on diving ducks and small surface feeding ducks than on large surface-feeding ducks. We argue that observed patterns were caused by fish predation on ducks rather than by fish-duck competition for common prey.

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