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Fig. 8 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 8. Scatterplot of the relationship between time to fatigue (min) and percent fatigued for piaus of three different speed classes (lines represent fit of the models for each size class).

Fig. 7 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 7. Mean (± standard deviation – SD; minimum – Min; and Maximum – Max) values of prolonged speed (length/s) per fatigue time (min/10) for the piau Leporinus reinhardti.

Fig. 6 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 6. Mean (± standard deviation – SD; minimum – Min; and Maximum – Max) values of time to fatigue (min) per speed class (lengths/s) for piau Leporinus reinhardti.

Fig. 5 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 5. Curves representing the relationship between critical speed (m/s) and length (m) for the piau at different temperatures, compared to two salmonids (Salmo salar and Oncorhynchus nerka).

Fig. 4 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 4. Curves representing the relationship between critical swimming speed (m/s) and length (m) for the piau (continuous line in the squares on the top left of the figure) and some species from the temperate zone. Full names of some species are given in Table 2).

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Fig. 2 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 2. Number of tested fish per total length classes used to determine prolonged speed.

opencc-zeroDec 2016View details →

Data from: Body condition explains migratory performance of a long-distance migrant

Body condition (i.e. relative mass after correcting for structural size) affects the behaviour of migrating birds, but how body condition affects migratory performance, timing and fitness is still largely unknown. Here, we studied the effects of relative body condition on individual departure decisions, wind selectivity, flight speed and timing of migration for a long-distance migratory shorebird, the red knot Calidris canutus rufa. By using automated VHF telemetry on a continental scale, we studied knots' migratory movements with unprecedented temporal resolution over a 3-year period. Knots with a higher relative body condition left the staging site later than birds in lower condition, yet still arrived earlier to their Arctic breeding grounds compared to knots in lower relative body condition. They accomplished this by selecting more favourable winds at departure, thereby flying faster and making shorter stops en route. Individuals with a higher relative body condition in spring migrated south up to a month later than individuals in lower condition, suggesting that individuals in better condition were more likely to have bred successfully. Moreover, individuals with a lower relative body condition in spring had a lower probability of being detected in autumn, suggestive of increased mortality. The pressure to arrive early to the breeding grounds is considered to be an important constraint of migratory behaviour and this study highlights the important influence of body condition on migratory decisions, performance and potentially fitness of migrant birds.

opencc-zeroDec 2012View details →

Data from: Social learning of migratory performance

Successful bird migration can depend on individual learning, social learning, and innate navigation programs. Using 8 years of data on migrating whooping cranes, we were able to partition genetic and socially learned aspects of migration. Specifically, we analyzed data from a reintroduced population wherein all birds were captive bred and artificially trained by ultralight aircraft on their first lifetime migration. For subsequent migrations, in which birds fly individually or in groups but without ultralight escort, we found evidence of long-term social learning, but no effect of genetic relatedness on migratory performance. Social learning from older birds reduced deviations from a straight-line path, with 7 years of experience yielding a 38% improvement in migratory accuracy.

opencc-zeroDec 2017View details →

Data from: Linking oceanographic conditions, migratory schedules and foraging behaviour during the non‐breeding season to reproductive performance in a long‐lived seabird

1. Studies of the mechanisms underlying climate-induced population changes are critically needed to better understand and accurately predict population responses to climate change. Long-lived migratory species might be particularly vulnerable to climate change as they are constrained by different climate conditions and energetic requirements during the breeding and non-breeding seasons. Yet, most studies primarily focus on the breeding season of these species lifecycle. Environmental conditions experienced in the non-breeding season may have downstream effects on the other stages of the annual lifecycle. Not investigating such effects may potentially lead to erroneous inferences about population dynamics. 2. Combining demographic and tracking data collected between 2006 and 2013 at Kerguelen Island on a long-lived migratory seabird, the Black-Browed Albatross (Thalassarche melanophris), we investigated the links between sea surface temperature during the non-breeding season and behavioural and phenological traits (at-sea behaviour and migratory schedules) while accounting for different responses between birds of different sex and reproductive status (previously failed or successful breeders). We then explored if variation in the foraging behaviour and timing of spring migration influenced subsequent reproductive performance. 3. Our results showed that foraging activity and migratory schedules varied by both sex and reproductive status suggesting different energetic requirements and constraints among individuals. Higher sea surface temperatures during late winter, assumed to reflect poor winter conditions, were associated with an earlier departure from the wintering grounds and an extended pre-breeding period. However, an earlier spring migration and an earlier return to Kerguelen grounds were associated with a lower breeding success. 4. Our results highlighted that behaviour during some periods of the non-breeding season, particularly towards the end of the wintering period and the pre-breeding period had a significant effect on the subsequent reproductive success. Therefore, caution needs to be given to all stages of the annual cycle when predicting the influence of climate on population dynamics.

publicSep 2013View details →

Data from: Social learning of migratory performance

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publicApr 2018View details →

Data from: Reproductive performance of resident and migrant males, females and pairs in a partially migratory bird

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publicOct 2017View details →

Data from: Body condition explains migratory performance of a long-distance migrant

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publicNov 2016View details →

Data from: On fitness and partial migration in a large herbivore – migratory moose have higher reproductive performance than residents

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publicApr 2019View details →

Data from: Linking oceanographic conditions, migratory schedules and foraging behaviour during the non‐breeding season to reproductive performance in a long‐lived seabird

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Data from: Low intensity blood parasite infections do not reduce the aerobic performance of migratory birds

Blood parasites (Haemosporidia) are thought to impair the flight performance of infected animals, and therefore, infected birds are expected to differ from their non-infected counterparts in migratory capacity. Since haemosporidians invade host erythrocytes, it is commonly assumed that infected individuals will have compromised aerobic capacity, but this has not been examined in free-living birds. We tested if haemosporidian infections affect aerobic performance by examining metabolic rates and exercise endurance in migratory great reed warblers (Acrocephalus arundinaceus) experimentally treated with Plasmodium relictum pGRW04 and in naturally infected wild birds over consecutive life history stages. We found no effect of acute or chronic infections on resting metabolic rate, maximum metabolic rate or exercise endurance in either experimentally treated or free-living birds. Oxygen consumption rates during rest and while undergoing maximum exercise as well as exercise endurance increased from breeding to migration stages in both infected and non-infected birds. Importantly, phenotypic changes associated with preparation for migration were similarly unaffected by parasitaemia. Consequently, migratory birds experiencing parasitaemia levels typical of chronic infection do not differ in migratory capacity from their uninfected counterparts. Thus, if infected hosts differ from uninfected conspecifics in migration phenology, another mechanism than changes in aerobic capacity should be involved.

opencc-zeroDec 2017View details →

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Data from: Low intensity blood parasite infections do not reduce the aerobic performance of migratory birds

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publicJan 2018View details →

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Fig. 1 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)

Fig. 1. Number of tested fish per total length classes used to determine critical speed.