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opencc-zeroNov 2020View details →

Multi-scale habitat assessment of pronghorn migration routes

We studied the habitat selection of pronghorn (Antilocapra americana) during seasonal migration; an important period in an animal's annual cycle associated with broad-scale movements. We further decompose our understanding of migration habitat itself as the product of both broad- and fine-scale behavioral decisions and take a multi-scale approach to assess pronghorn spring and fall migration across the transboundary Northern Sagebrush Steppe region. We used a hierarchical habitat selection framework to assess a suite of natural and anthropogenic features that have been shown to influence selection patterns of pronghorn at both broad (migratory neighborhood) and fine (migratory pathway) scales. We then combined single-scale predictions into a scale-integrated step selection function (ISSF) map to assess its effectiveness in predicting migration route habitat. During spring, pronghorn selected for native grasslands, areas of high forage productivity (NDVI), and avoided human activity (i.e., roads and oil and natural gas wells). During fall, pronghorn selected for native grasslands, larger streams and rivers, and avoided roads. We detected avoidance of paved roads, unpaved roads, and wells at broad spatial scales, but no response to these features at fine scales. In other words, migratory pronghorn responded more strongly to anthropogenic features when selecting a broad neighborhood through which to migrate than when selecting individual steps along their migratory pathway. Our results demonstrate that scales of migratory route selection are hierarchically nested within each other from broader (second-order) to finer scales (third-order). In addition, we found other variables during particular migratory periods (i.e., native grasslands in spring) were selected for across scales indicating their importance for pronghorn. The mapping of ungulate migration habitat is a topic of high conservation relevance. In some applications, corridors are mapped according to telemetry location data from a sample of animals, with the assumption that the sample adequately represents habitat for the entire population. Our use of multi-scale modelling to predict resource selection during migration shows promise and may offer another relevant alternative for use in future conservation planning and land management decisions where telemetry-based sampling is unavailable or incomplete.

opencc-zeroJan 2021View details →

An early dog from Southeast Alaska supports a coastal route for the first dog migration into the Americas

The oldest confirmed remains of domestic dogs in North America are from mid-continent archeological sites dated ~9,900 calibrated years before present (cal BP). Although this date suggests that dogs may not have arrived alongside the first Native Americans, the timing and routes for the entrance of New World dogs are unclear. Here, we present a complete mitochondrial genome of a dog from Southeast Alaska, dated to 10,150 ± 260 cal BP. We compared this high-coverage genome with data from modern dog breeds, historical Arctic dogs, and American precontact dogs (PCDs) from before European arrival. Our analyses demonstrate that the ancient dog shared a common ancestor with PCDs that lived ~14,500 years ago and diverged from Siberian dogs around 16,000 years ago, coinciding with the minimum suggested date for the opening of the North Pacific coastal (NPC) route along the Cordilleran Ice Sheet and genetic evidence for the initial peopling of the Americas. This ancient Southeast Alaskan dog occupies an early branching position within the PCD clade, indicating it represents a close relative of the earliest PCDs that were brought alongside people migrating from eastern Beringia southward along the NPC to the rest of the Americas. The stable isotope δ13C value of this early dog indicates a marine diet, different from the younger mid-continent PCDs' terrestrial diet. Although PCDs were largely replaced by modern European dog breeds, our results indicate that their population decline started ~2,000 years BP, coinciding with the expansion of Inuit peoples, who are associated with traditional sled-dog culture. Our findings suggest that dogs formed part of the initial human habitation of the New World, and provide insights into their replacement by both Arctic and European lineages.

opencc-zeroDec 2012View details →

Data from: Migration routes and staging areas of trans-Saharan Turtle Doves appraised from light-level geolocators

The identification of migration routes, wintering grounds and stopover sites are crucial issues for the understanding of the Palearctic-African bird migration system as well as for the development of relevant conservation strategies for trans-Saharan migrants. Using miniaturized light-level geolocators we report a comprehensive and detailed year round track of a granivorous trans-Saharan migrant, the European Turtle Dove (Streptopelia turtur). From five recovered loggers, our data provide new insights on migratory journeys and winter destinations of Turtle Doves originating from a breeding population in Western France. Data confirm that Turtle Doves wintered in West Africa. The main wintering area encompassed Western Mali, the Inner Delta Niger and the Malian/Mauritanian border. Some individuals also extended their wintering ranges over North Guinea, North-West of Burkina Faso and the Ivory-Coast. Our results reveal that all individuals did not spend the winter period at a single location; some of them experienced a clear eastward shift of several hundred kilometres. We also found evidence for a loop migration pattern, with a post-breeding migration flyway lying west of the spring route. Finally, we found that on their way back to breeding grounds Turtle Doves needed to refuel after crossing the Sahara desert. Contrary to previous suggestions, our data reveal that birds used stopover sites for several weeks, presumably in Morocco and North Algeria. This later finding is a crucial issue for future conservation strategies because environmental conditions on these staging areas might play a pivotal role in population dynamics of this declining species.

opencc-zeroDec 2015View details →

Data from: Geographic differentiation of domesticated einkorn wheat and possible Neolithic migration routes

To analyse the spread of domesticated einkorn into Europe, 136 landraces, 9 wild einkorns and 3 Triticum urartu were fingerprinted by the diversity array technology sequence (DArT-seq) marker technology. The obtained 3455 single-nucleotide polymorphism (SNP) markers confirmed earlier results about the separation of wild and domesticated einkorn from T. urartu and about the pinpointing of the domesticated forms to the Karacadağ Mountains (Turkey). Further analyses identified two major domesticated landrace einkorn groups, one relating to the Prealpine region and the other to the Maghreb/Iberian region. The previously published four geographical provenance groups were mostly identified in our results. The earlier reported unique position of the Maghreb/Iberia einkorns cannot be confirmed, as the three landrace clusters we identified with STRUCTURE also occur in the remaining einkorn, although at different frequencies. The results are discussed with respect to the spreading of domesticated einkorn into Western Europe and two possible Neolithic migration routes are indicated.

opencc-zeroDec 2018View details →

Data from: A Western route of prehistoric human migration from Africa into the Iberian Peninsula

Being at the Western fringe of Europe, Iberia had a peculiar prehistory and a complex pattern of Neolithization. A few studies, all based on modern populations, reported the presence of DNA of likely African origin in this region, generally concluding it was the result of recent gene flow, probably during the Islamic period. Here we provide evidence of much older gene flow from Africa to Iberia by sequencing whole genomes from four human remains from Northern Portugal and Southern Spain dated around 4,000 years BP (from the Middle Neolithic to the Bronze Age). We found one of them to carry an unequivocal Sub-Saharan mitogenome of most likely West or West-Central African origin, never reported before in prehistoric remains outside Africa. Our analyses of ancient nuclear genomes show small but significant levels of Sub-Saharan African affinity in several ancient Iberian samples, which indicates that what we detected was not an occasional individual phenomenon, but an admixture event recognizable at the population level. We interpret this result as evidence of an early migration process from Africa into the Iberian Peninsula through a Western route, possibly across the Strait of Gibraltar.

Fig. 5 in Accumulations of Fossils of the Whale Barnacle Coronula bifida Bronn, 1831 (Thoracica: Coronulidae) Provides Evidence of a Late Pliocene Cetacean Migration Route through the Straits of Taiwan

Fig. 5. (A-F) Amphibalanus? sp. collected from the Liuchungchi Formation, Niupu, Chiayi, Western Central Taiwan, (Plio-Pleistocene age). Note that the shell compartment are tubiferous and possess interlaminate figures.

Fig. 2 in Accumulations of Fossils of the Whale Barnacle Coronula bifida Bronn, 1831 (Thoracica: Coronulidae) Provides Evidence of a Late Pliocene Cetacean Migration Route through the Straits of Taiwan

Fig. 2. Trace fossils from the Liuchungchi Formation,Chukou Niupu at Chaiyi City, Taiwan. (A) Asterosoma isp. (#2267); (B) Bifasiculus? isp. (#2265); (C) Asterosoma isp. (#2263); (D) Asterosoma isp. (#2264). These ichnofossils were likely formed by annelids, and give evidence for low-energy sea bottom conditions. Specimens held in the Chia-Yi Municipal Museum, Chaiyi City. (The diameter of the coin is 26 mm).

Fig. 4 in Accumulations of Fossils of the Whale Barnacle Coronula bifida Bronn, 1831 (Thoracica: Coronulidae) Provides Evidence of a Late Pliocene Cetacean Migration Route through the Straits of Taiwan

Fig. 4. (A-F) Striatobalanus sp. collected from the Liuchungchi Formation, Niupu, Chiayi, Western Central Taiwan, during the Plio- Pleistocene. Note that the shell walls, radii and bases are solid (i.e. non-tubiferous).

Fig. 1 in Accumulations of Fossils of the Whale Barnacle Coronula bifida Bronn, 1831 (Thoracica: Coronulidae) Provides Evidence of a Late Pliocene Cetacean Migration Route through the Straits of Taiwan

Fig. 1. Location of the Coronula bifida Lagerstätte site near Niupu, Zhongpu Township, Chiayi, Western Central Taiwan. Insert showing the site on the Bazhang riverbed near the Chukou Niupu in Chaiyi City.

Fig. 3. Coronula bifida Bronn, 1831 in Accumulations of Fossils of the Whale Barnacle Coronula bifida Bronn, 1831 (Thoracica: Coronulidae) Provides Evidence of a Late Pliocene Cetacean Migration Route through the Straits of Taiwan

Fig. 3. Coronula bifida Bronn, 1831 from Niupu, Chiayi, Western Central Taiwan, Liuchungchi Formation (Plio-Pleistocene). Specimens (#0860-0869) held by the Chia-Yi Municipal Museum, Chaiyi City, Taiwan.

Fig. 6. A in Accumulations of Fossils of the Whale Barnacle Coronula bifida Bronn, 1831 (Thoracica: Coronulidae) Provides Evidence of a Late Pliocene Cetacean Migration Route through the Straits of Taiwan

Fig. 6. A large fossil baleen whale mandible, currently attributed to the humpback whale, Megaptera novaeangliae Gray, 1846. Recovered from the Liuchungchi Formation, Zhongpu Township, Chiayi, Western Central Taiwan. On display in the Chia-Yi Municipal Museum, Chaiyi City, Taiwan.

opencc-zeroDec 2014View details →

Data from: Timing and route of migration of mature female blue crabs in a tidal estuary

Information on migration patterns is critical to using no-take migratory corridors and marine reserves to protect the spawning stock of commercially exploited species. Both active and passive acoustic tracking methods quantified movement of commercially and ecologically important blue crabs in the White Oak River estuary, NC, USA. We targeted post-mating female crabs migrating down-estuary to oceanic spawning grounds. Crabs travelled approximately 14.1 km mainly in deeper channels and over 12–26 days from mating areas to spawning grounds. No crabs were detected migrating down-estuary in the autumn and only 30% were detected migrating down-estuary in spring. None of the crabs detected near spawning grounds were detected or recaptured back up-estuary, suggesting that they either (i) do not return to the estuary after a one to two week period in the spawning area or (ii) were captured by fishermen. The results from this study demonstrate that (1) acoustic transmitters coupled with passive acoustic receivers provided reliable and valuable data on migration patterns of mature female blue crabs and (2) mature female blue crabs are capable of migrating primarily within deep channels to spawning grounds shortly after insemination.

opencc-by-4.0Nov 2021View details →

Rapid formation of new migration route and breeding area by Arctic geese

Scripts and datasets used for demographic and climate data analyses in the paper "Rapid formation of new migration route and breeding area by Arctic geese" by Jesper Madsen, Kees H.T. Schreven, Gitte H. Jensen, Fred A. Johnson, Leif Nilsson, Bart A. Nolet and Jorma Pessa

publicMay 2015View details →

Data from: Timing and route of migration of mature female blue crabs in a tidal estuary

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publicApr 2016View details →

Data from: Geographic differentiation of domesticated einkorn wheat and possible Neolithic migration routes

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