scholarly journals Learning the Hard Way: Imprinting Can Enhance Enforced Shifts in Habitat Choice

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Niclas Vallin ◽  
Anna Qvarnström
Keyword(s):  
Reproductive Isolation ◽  
Forest Type ◽  
Mixed Forest ◽  
Habitat Choice ◽  
Secondary Contact ◽  
Habitat Shift ◽  
Habitat Types ◽  
Closely Related Species ◽  
Preferred Habitat ◽  
Cross Fostering

We investigated the potential importance of learning in habitat choice within a young hybrid zone of two closely related species of birds. Pied flycatchers (Ficedula hypoleuca) are being excluded from deciduous habitats into a mixed forest type by collared flycatchers (F. albicollis). We investigated whether this enforced habitat shift influenced reproductive isolation between the two species, and, by cross-fostering nestlings, we tested whether learning may lead to a corresponding shift in habitat choice in consecutive generations. Our results show that the majority of the recruits, even if translocated across different habitat types, return to breed in the area where they were fostered. As male pied flycatchers were more likely to hybridize in the originally preferred habitat, we argue that early imprinting on an alternate habitat can play an important role in increasing reproductive isolation and facilitate regional coexistence between species experiencing secondary contact.

scholarly journals The origin and remolding of genomic islands of differentiation in the European sea bass

2017 ◽  
Author(s):  
Maud Duranton ◽  
François Allal ◽  
Christelle Fraïsse ◽  
Nicolas Bierne ◽  
François Bonhomme ◽  
...  
Keyword(s):  
Reproductive Isolation ◽  
Sea Bass ◽  
Genomic Islands ◽  
Secondary Contact ◽  
European Sea Bass ◽  
Closely Related Species ◽  
Fitness Effects ◽  
Genome Wide ◽  
Complex Process ◽  
Linked Selection

AbstractSpeciation is a complex process that leads to the progressive establishment of reproductive isolation barriers between diverging populations. Genome-wide comparisons between closely related species have revealed the existence of heterogeneous divergence patterns, dominated by genomic islands of increased divergence supposed to contain reproductive isolation loci. However, this divergence landscape only provides a static picture of the dynamic process of speciation, during which confounding mechanisms unlinked to speciation can interfere. Here, we used haplotype-resolved whole-genome sequences to identify the mechanisms responsible for the formation of genomic islands between Atlantic and Mediterranean sea bass lineages. We show that genomic islands first emerged in allopatry through the effect of linked selection acting on a heterogeneous recombination landscape. Upon secondary contact, preexisting islands were strongly remolded by differential introgression, revealing variable fitness effects among regions involved in reproductive isolation. Interestingly, we found that divergent regions containing ancient polymorphisms conferred the strongest resistance to introgression.

scholarly journals How Can Satellite DNA Divergence Cause Reproductive Isolation? Let Us Count the Chromosomal Ways

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Patrick M. Ferree ◽  
Satyaki Prasad
Keyword(s):  
Reproductive Isolation ◽  
Developmental Stages ◽  
Rapid Evolution ◽  
Model Organisms ◽  
Cellular Mechanisms ◽  
Closely Related Species ◽  
Heterochromatin Formation ◽  
Interspecies Hybrids ◽  
Postzygotic Reproductive Isolation ◽  
And Function

Satellites are one of the most enigmatic parts of the eukaryotic genome. These highly repetitive, noncoding sequences make up as much as half or more of the genomic content and are known to play essential roles in chromosome segregation during meiosis and mitosis, yet they evolve rapidly between closely related species. Research over the last several decades has revealed that satellite divergence can serve as a formidable reproductive barrier between sibling species. Here we highlight several key studies on Drosophila and other model organisms demonstrating deleterious effects of satellites and their rapid evolution on the structure and function of chromosomes in interspecies hybrids. These studies demonstrate that satellites can impact chromosomes at a number of different developmental stages and through distinct cellular mechanisms, including heterochromatin formation. These findings have important implications for how loci that cause postzygotic reproductive isolation are viewed.

Terrestrial gastropods from the Himsworth Game Preserve, Ontario, and their significance in Parelaphostrongylus tenuis transmission

1978 ◽  
Vol 56 (4) ◽  
pp. 688-694 ◽  
Author(s):  
Stephen R. Kearney ◽  
Frederick F. Gilbert
Keyword(s):  
Mixed Forest ◽  
Betula Papyrifera ◽  
Intermediate Hosts ◽  
Habitat Types ◽  
Terrestrial Gastropods ◽  
The Third ◽  
Open Habitat ◽  
Third Stage ◽  
Parelaphostrongylus Tenuis ◽  
Collection Period

Terrestrial gastropods were collected within the 1220-ha Himsworth Game Preserve in central Ontario during 1974 to determine their abundance and habitat preference. Collections from systematically arranged plots occurred 23 May to 4 June, 6 July to 14 July, and 26 August to 5 September. In all 16 498 gastropods were collected; 4351, in the first, 5622 in the second, and 6525 in the third collection period. Sixteen species were represented with Discus cronkhitei and Zonitoides arboreus accounting for 69.3% of the specimens. Deroceras laeve and Pallifera dorsalis were the most common slugs. Gastropods (excluding slugs) showed a significant preference for mixed forest and a significant aversion to open habitat types during all collection periods. Slugs were significantly less abundant in mixed forest and more abundant in open habitat types during the third collection period.Eight of the 16 species collected (80.1% of the specimens) have previously been identified as intermediate hosts of Parelaphostrongylus tenuis. However, only 19 third-stage larvae of P. tenuis were obtained from the 16450 gastropods digested in pepsin. It is proposed that Zonitoides arboreus in association with Betula papyrifera may be important components in the transmission of P. tenuis to cervids on the Himsworth Game Preserve.

scholarly journals Variation in three community features across habitat types and scales within a 15-ha subtropical evergreen-deciduous broadleaved mixed forest dynamics plot in China

2018 ◽  
Vol 8 (23) ◽  
pp. 11987-11998 ◽  
Author(s):  
Guang Feng ◽  
Jun-Qing Li ◽  
Run-Guo Zang ◽  
Yi Ding ◽  
Xun-Ru Ai ◽  
...  
Keyword(s):  
Forest Dynamics ◽  
Mixed Forest ◽  
Habitat Types ◽  
Forest Dynamics Plot

scholarly journals Habitat selection of Himalayan Musk Deer Moschus leucogaster (Mammalia: Artiodactyla: Moschidae) with respect to biophysical attributes in Annapurna Conservation Area of Nepal

2021 ◽  
Vol 13 (7) ◽  
pp. 18703-18712
Author(s):  
Bijaya Neupane ◽  
Nar Bahadur Chhetri ◽  
Bijaya Dhami
Keyword(s):  
Endangered Species ◽  
Management Strategies ◽  
Mixed Forest ◽  
Habitat Characteristics ◽  
Musk Deer ◽  
Importance Value Index ◽  
Importance Value ◽  
Conservation Area ◽  
Preferred Habitat ◽  
Annapurna Conservation Area

Himalayan or White-bellied Musk Deer Moschus leucogaster, an IUCN indexed endangered species, is distributed in isolated pockets in the Himalaya. The deer population is decreasing owing to several pressures that include habitat loss and fragmentation, and poaching. It is essential to identify preferred habitat characteristics to support appropriate management strategies for conserving this endangered species. This study was carried out in the Nysheang basin of Annapurna Conservation Area of Nepal to identify habitats preferred by the musk deer. Habitat field parameters were collected using transect surveys. To analyze vegetation use and availability, nested quadrate plots size 20 m2 were established. Ivlev’s electivity index (IV) (-1 to +1) was employed to determine habitat preference, and one-way ANOVA (F) and chi-square tests (χ2) were used to examine different habitat parameters. Similarly, the importance value index (IVI) of the vegetation was calculated. Our results showed that the Himalayan Musk Deer strongly preferred habitats at 3601–3800 m altitude (IV= 0.3, F= 4.58, P <0.05), with 21–30º slope (IV= 0.2, F= 4.14, P <0.05), 26–50 % crown cover (IV= 0.25, F= 4.45, P <0.05), 26–50 % ground cover (IV= 0.15, F= 4.13, P <0.05), and mixed forest (IV= 0.29, χ2= 28.82, df= 3, p <0.001). Among the trees, Abies spectabilis (IVI= 74.87, IV= 0.035) and Rhododendron arboretum (IVI= 55.41, IV= 0.02) were the most preferred, while Rhododendron lepidotum, Cassiope fastigiata (IV= 0.35) and Berberis aristata (IV= 0.25) were the most preferred shrubs, and Primula denticulata (IV= 0.87) and Primula rotundifolia (IV= 0.31) were the most preferred herbs. These preferred habitat conditions should be maintained and conserved to sustain a viable population of deer in the study area. Further studies will be required to assess the effects of climate change on habitat suitability. 

TEMPORAL AND SPATIAL PATTERNS OF RESOURCE USE AMONG NICROPHORUS CARRION BEETLES (COLEOPTERA: SILPHIDAE) IN A SPHAGNUM BOG AND ADJACENT FOREST NEAR OTTAWA, CANADA

1992 ◽  
Vol 124 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Clifford W. Beninger ◽  
Stewart B. Peck
Keyword(s):  
Resource Use ◽  
Brood Size ◽  
Significant Positive Correlation ◽  
Mixed Forest ◽  
Resource Acquisition ◽  
Closely Related Species ◽  
Temporal And Spatial Patterns ◽  
Temporal And Spatial ◽  
Carrion Beetles ◽  
Sphagnum Bog

AbstractThis study examines reproductive resource acquisition and utilization among Nicrophorus carrion beetles (Coleoptera: Silphidae) in two different and adjacent habitats. The proportion of small carrion resource (dead mice, Mus musculus L.) used by Nicrophorus and other scavengers in a Sphagnum bog did not differ significantly from that used in a nearby forest. Among congeneric Nicrophorus, N. vespilloides Herbst reproduced on small carrion exclusively in the Sphagnum bog, whereas a closely related species, N. defodiens Mannerheim, reproduced only in the nearby mixed forest. Nicrophorus sayi Laporte, N. orbicollis Say, and N. tomentosus Weber were rarely associated with small carrion resource in the bog, and reproduced primarily in the forest during the spring, summer, and fall, respectively. A significant positive correlation between brood size and weight of larval carrion resource was found for N. vespilloides.

scholarly journals A comparison of reproductive isolation between two closely related oak species in zones of recent and ancient secondary contact

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Wan-Jin Liao ◽  
Bi-Ru Zhu ◽  
Yue-Fei Li ◽  
Xiao-Meng Li ◽  
Yan-Fei Zeng ◽  
...  
Keyword(s):  
Reproductive Isolation ◽  
Secondary Contact

Reproductive isolation between two closely related species of the Queensland fruit fly Dracus tryoni (Frogg) and D. neohumeralis Hardy (Diptera : Tephritidae) I. Variation in humeral callus pattern and the occurrence of intermediate colour forms in the wild

1967 ◽  
Vol 15 (3) ◽  
pp. 501 ◽  
Author(s):  
H Wolda
Keyword(s):  
Reproductive Isolation ◽  
Related Species ◽  
Fruit Fly ◽  
Abundant Species ◽  
Colour Pattern ◽  
Wild Populations ◽  
Closely Related Species ◽  
Similar Variation ◽  
In The Wild

A number of samples from wild populations of the Queensland fruit fly, Dacus tryoni and D. neohumeralis, were studied. There is a considerable variation in the colour pattern on the humeral callus. This variation is continuous so that any criterion for distinguishing between "intermediates" and "good species" is purely arbitrary. It was found in areas where D. neohumeralis does not occur as well as in localities where it is very abundant. By whatever criterion one defines intermediates, there appears to be no relation between the frequency of such forms and the presence or absence of D. neohumeralis or with the relative proportions of the two species in the population. However, flies with only a very small yellow area on an otherwise brown humeral callus were found only in Cairns where D. neohumeralis is usually the most abundant species. A similar variation in humeral callus pattern was found in other related species, such as D. kraussi and D. halfordiae. It is concluded that the intermediate colour forms may not be hybrids between D. tryoni and D. neohumeralis but variants of D. tryoni and, possibly the darker forms from Cairns, of D. neohumeralis.

scholarly journals Distribution and Habitat Preference of Sloth Bear in Chitwan National Park, Nepal

2015 ◽  
Vol 28 ◽  
pp. 9-17
Author(s):  
Dinesh Ghimire ◽  
Tej Bahadur Thapa
Keyword(s):  
Habitat Use ◽  
Human Activities ◽  
Habitat Preference ◽  
National Park ◽  
Mixed Forest ◽  
Habitat Types ◽  
Sal Forest ◽  
Chitwan National Park ◽  
Sloth Bear ◽  
Effective Conservation

Effective conservation of Sloth bear requires detailed information regarding their distribution and habitat use. This study attempted to generate baseline data on distribution and habitat preference of Sloth Bear in Chitwan National Park, Nepal during March–May 2012. The study area was divided into 74 grids each measuring 16 Km2. Of the total grids, 35 were randomly selected for occupancy sampling. A total of 288 spatial replicates were sampled in 35 different grids recording 87 direct or indirect evidences of Sloth bear. Among them, 50 diggings, 25 scats, four scrapes with live animals in eight points were detected in four different habitat types of the Park. The variance to mean ratio showed clumped distribution of Sloth bear. The RPI values revealed that the mixed forest was found to be most preferred (RPI = 0.42) by Sloth Bear followed by grassland (RPI = 0.21). Riverine forest and Sal forest were less preferred (RPI = -0.25 and -0.11 respectively) but not avoided. Distribution of Sloth bear was influenced by distance to nearest water sources, distance to road and altitude. Similarly, disturbances like human activities, presence of cattle and fi re were found to affect the distribution of Sloth bear.J. Nat. Hist. Mus. Vol. 28, 2014: 9-17

scholarly journals Limited intrinsic postzygotic reproductive isolation despite chromosomal rearrangements between closely related sympatric species of small ermine moths (Lepidoptera: Yponomeutidae)

2019 ◽  
Vol 128 (1) ◽  
pp. 44-58 ◽  
Author(s):  
Katerina H Hora ◽  
František Marec ◽  
Peter Roessingh ◽  
Steph B J Menken
Keyword(s):  
Reproductive Isolation ◽  
Parental Species ◽  
Meiotic Chromosome ◽  
Chromosomal Rearrangements ◽  
Sympatric Species ◽  
Hybrid Fitness ◽  
New Host ◽  
Closely Related Species ◽  
Postzygotic Reproductive Isolation

Abstract In evolutionarily young species and sympatric host races of phytophagous insects, postzygotic incompatibility is often not yet fully developed, but reduced fitness of hybrids is thought to facilitate further divergence. However, empirical evidence supporting this hypothesis is limited. To assess the role of reduced hybrid fitness, we studied meiosis and fertility in hybrids of two closely related small ermine moths, Yponomeuta padella and Yponomeuta cagnagella, and determined the extent of intrinsic postzygotic reproductive isolation. We found extensive rearrangements between the karyotypes of the two species and irregularities in meiotic chromosome pairing in their hybrids. The fertility of reciprocal F1 and, surprisingly, also of backcrosses with both parental species was not significantly decreased compared with intraspecific offspring. The results indicate that intrinsic postzygotic reproductive isolation between these closely related species is limited. We conclude that the observed chromosomal rearrangements are probably not the result of an accumulation of postzygotic incompatibilities preventing hybridization. Alternative explanations, such as adaptation to new host plants, are discussed.

Sign in / Sign up

Export Citation Format

Share Document