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70 results for “habitat isolation”
FIG. 3 in Going with the Flow: Testing the Role of Habitat Isolation among Three Ecologically Divergent Darter Species
FIG. 3. Bar plots representing estimated genetic clusters (K) and individual probability estimates of cluster assignment (Q values) from program STRUCTURE for (A) A. beanii at K ¼ 5, (B) E. swaini at K ¼ 2, and (C) P. nigrofasciata at K ¼ 4. The most likely K value was estimated using the ad hoc DK statistic (Evanno et al., 2005).
FIG. 2 in Going with the Flow: Testing the Role of Habitat Isolation among Three Ecologically Divergent Darter Species
FIG. 2. Chart showing habitat characteristics of each darter species and predicted levels of gene flow between populations based on habitat variables. FST represents population differentiation, while AR represents allelic richness. Arrows pointing up indicate an increase, arrows pointing down a decrease, and horizontal arrows indicate moderate/intermediate levels. Illustrations were designed by Elizabeth Marchio (elizabeth. marchio@gmail.com; www.lizmarchio.com).
FIG. 1 in Going with the Flow: Testing the Role of Habitat Isolation among Three Ecologically Divergent Darter Species
FIG. 1. Map of Pearl River including sampling sites for the three darter species. Ammocrypta beanii, Etheostoma swaini, and Percina nigrofasciata are represented by circles, squares, and diamonds, respectively. Map was generated using ArcGIS ArcMap 10.
Performance-based habitat choice can drive rapid adaptive divergence and reproductive isolation - Data
<p>Data for Performance-based habitat choice can drive rapid adaptive divergence and reproductive isolation</p>
FIGURE 2. Habitat and the substrate where Nodosilinea svalbardensis was found. A in New cyanobacterium Nodosilinea svalbardensis sp. nov. (Prochlorotrichaceae, Synechococcales) isolated from alluvium in Mimer river valley of the Svalbard archipelago
FIGURE 2. Habitat and the substrate where Nodosilinea svalbardensis was found. A. The habitat in the river valley. B. Macrocolony of Nostoc commune under which N. svalbardensis occurred.
Data from: Manipulation of habitat isolation and area implicates deterministic factors and limited neutrality in community assembly
Theory predicts deterministic and stochastic factors will contribute to community assembly in different ways: environmental filters should regulate those species that establish in a particular area resulting in the ecological requirements of species being the primary driver of species distributions, while chance and dispersal limitation should dictate the likelihood of species reaching certain areas with the ecology of species being largely neutral. These factors are specifically relevant for understanding how the area and isolation of different habitats or islands interact to affect community composition. Our review of the literature found few experimental studies have examined the interactive effect of habitat area and isolation on community assembly, and the results of those experiments have been mixed. We manipulated the area and isolation of rock 'islands' created de novo in a grassland matrix to experimentally test how deterministic and stochastic factors shape colonizing animal communities. Over 64 weeks, the experiment revealed the primacy of deterministic factors in community assembly, with habitat islands of the same size exhibiting remarkable consistency in community composition and diversity, irrespective of isolation. Nevertheless, tangible differences still existed in abundance inequality among taxa: large, near islands had consistently higher numbers of common taxa compared to all other island types. Dispersal limitation is often assumed to be negligible at small spatial scales, but our data shows this not to be the case. Furthermore, the dispersal limitation of a subset of species has potentially complex flow-on effects for dictating the type of deterministic factors affecting other colonising species.
Data from: Weak habitat isolation in a threespine stickleback (Gasterosteus spp.) species pair
Reproductive isolation is central to the study of speciation. Multiple isolating barriers may prevent species from hybridizing, although their individual strength and the interactions between them are rarely measured. We quantified habitat isolation in a recently diverged threespine stickleback species pair (Gasterosteus aculeatus complex) and controlled for any such interactions. Using enclosures in an outdoor pond, we confirm that males of the two species strongly prefer different nesting habitats: limnetic males build nests in open habitats, whereas benthic males nest under vegetation. However, forcing males to nest in their nonpreferred habitat did not reduce the probability of spawning by females. As a result, habitat isolation between the species is estimated to be weak. We compared the strength of habitat isolation estimated in the present study with estimates of other behavioural barriers using previously published data. We discovered that, although total mating isolation between the species is strong, the contributions of differences in body size and male nuptial colour are similarly individually weak. Instead, interactions with other, undetermined species-specific traits were responsible for most of the isolation resulting from differences in body size and, in benthics, colour. This is one of the first attempts to estimate individual isolating barriers at the same time as controlling for interactions.
Extra-pair fertilizations counter the reproductive isolation emerging from performance-based habitat choice Data
<p>Experimental rapid and small-scale ecological population divergence in the absence of current natural selection Data</p>
Data from: Habitat isolation reduces intra- and interspecific biodiversity and stability
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Data from: Small but not isolated: a population genetic survey of the tropical tree Cariniana estrellensis (Lecythidaceae) in a highly fragmented habitat
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Data from: Manipulation of habitat isolation and area implicates deterministic factors and limited neutrality in community assembly
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Data from: Intra-specific variability of hindlimb length in the palmate newt: an indicator of population isolation induced by habitat fragmentation?
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Data from: Partitioning the effects of spatial isolation, nest habitat, and individual diet in causing assortative mating within a population of threespine stickleback
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Data from: Habitat or temporal isolation: unravelling herbivore-parasitoid speciation patterns using double digest RADseq
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Data from: Effects of vicariant barriers, habitat stability, population isolation and environmental features on species divergence in the south-western Australian coastal reptile community
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Data from: Weak habitat isolation in a threespine stickleback (Gasterosteus spp.) species pair
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Data from: Are habitat fragmentation, local adaptation and isolation by distance driving population divergence in wild rice Oryza rufipogon?
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Singing under glass: rapid effects of anthropogenic habitat modification on song and response behaviours in an isolated house sparrow (Passer domesticus) population
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Data from: No signs of inbreeding despite long-term isolation and habitat fragmentation in the critically endangered Montseny brook newt (Calotriton arnoldi)
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Data from: Contribution of small isolated habitats in creating refuges from biological invasions along a geomorphological gradient of floodplain waterbodies
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