Resource Partitioning in Ecological Communities: Research on how similar species divide resources helps reveal the natural regulation of species diversity.

“Thus, it is assumed that an increase of habitat spatial heterogeneity contributes to a higher persistence of natural assemblages composed by conflicting species ( Schoener 1974 ).”

“…in overall life history strategies represent another mechanism for niche divergence that could facilitate coexistence on Caribbean coral reefs (Schoener, 1974) and highlight the fact that community composition on Caribbean coral reefs is impacted by diverse ecological processes including…”

“…scenario, the establishment of diverging host–symbiont relationships – possibly combined with differential microhabitat specialisations – may have facilitated the maintenance of the two sister species in syntopy, avoiding competitive exclusion (Levin, 1970; Schoener, 1974; Scriven et al., 2016).”

“Coexistence of ocelots with these other species can largely be explained by differences in morphology [18], habitat selection, and diel activity patterns [19,20].”

“…postulates that two species with overlapping niches should be negatively impacted by the presence of the other due to competition, which in turn should lead to character displacement (Brown & Wilson, 1956), niche segregation, and avoidance (MacArthur & Levins, 1967; Schoener, 1974; Schluter, 2000).”

“The niche relationships of the two sympatric Strix owl species have been studied with respect to their food, nest, and habitat preferences and their diurnal and vocal activity (von Haartman 1968; Schoener 1974; Korpimaki 1986).”

“…food resources by using different foraging behaviors (Lefebvre & Poulin 1997, Kornan & Adamik 2007, B€ohm & Kalko 2009, Greenberg & Olsen 2010), vertical strata (Recher & Davis 1998, Walther 2002, Styring & Zakaria 2004) or by the differential use of microhabitats (Cody 1974, Schoener 1974).”

“While it is clear that niche partiioning is a genuine feature of ecological communities (Diamond, 973; Schoener, 1974), classical niche partitioning cannot explain”

“Body size is well regarded as a fundamental trait of an organism, inextricably tied to the modes and intensities of interspecies interaction as well as ecological properties of a species (Schoener 1969, 1974; Werner and Gilliam 1984; Woodward et al. 2005).”

“The main objective of resource partitioning studies is to describe diet overlap, which may lead to inter and intra-species competition, thereby influencing the number of species that co-exist (Schoener 1974).”

“By changing how they distribute crucial activities, such as feeding throughout the day, sympatric species can reduce their degree of interspecific contest competition during periods of food shortage (Schoener 1974; Tokeshi 1999).”

“Compared to other groups, however, predators aremore often separated by specific diel activity patterns (Schoener, 1974) and our study shows that the ecological function, prey capture rate, of juvenile flounder and brown shrimp is similar, but separated temporally.”

“In general, competition between sympatric species is mitigated by partitioning resources in three niche dimensions: Space, time and food [19].”

“Likewise, competitive interactions can lead to resource partitioning (Schoener 1974) and character displacement (Schluter and McPhail 1992; Grant 1999), potentially influencing population dynamics of the species involved, as well as the structure and function of ecological communities (e.g.,…”

“For such species to coexist, theory anticipates some degree of niche differentiation whereby interspecific competition is reduced (Schoener 1974).”

“The spatial dimension of the niche is the most frequently partitioned, especially when considered at finer scales [10,14,15].”

“Feeding ecology can also be influenced by resource partitioning, likely to reduce resource competition within communities (Ross, 1986; Schoener, 1974), or can be the result of past interactions.”

“Therefore, species that coexist harmoniously in the same communities are expected to segregate with respect to the use of food, space, and/or time (Schoener, 1974; Gabler & Amundsen, 1999; Pianka, 2000).”

“We modified a wellestablished ecological overlap index (Schoener index, Schoener, 1974) to create the EFI, a novel measure of similarity between 2 fish individuals considering numerous chemical signatures in their otoliths.”

“Occupied niches represent the use of resources (Bearhop et al. 2004), and ecologists are interested in how species of the same community utilize these resources in different ways (Schoener 1974).”

“Resource partitioning between parasitic species reflects strategies to avoid competition on a host (Schoener, 1974; Mouillot et al. 2003) and is often correlated with ecomorphological and/or behavioral adaptations, for example to an efficient use of particular locations on the host (Bush et al.…”

“Competition over shared resources may be reduced by niche partitioning in areas where species overlap (Hutchinson, 1959; Schoener, 1974).”

“30) of the two species do not broadly overlap; however, (2) their abiotically suitable areas (GA) overlap, forming what has been termed as ‘areas of potential sympatry’16; (3) within the areas of potential sympatry, contact zones exist, where competition could take place (this allows for testing the geographic predict…”

“In contrast, Copepoda (P. lamellatus + nauplii) was the most important assimilated resource for the predatory L. raynerae relative to the other resources throughout the hydroperiod with the exception of the final sampling event where Cladoceran contributions dominated.”

“Differential use of microhabitat (Jorgensen 2004) or distinct feeding habits (Schoener 1974) might enable the coexistence of these morphologically similar arboreal species, but this is an open question that needs to be assessed.”

“Several factors may influence the ecological segregation among species, and dietary and spatial resources are considered the predominant factors in structuring populations and communities of vertebrates (Schoener 1974).”

“…type, density and distribution, cover, substrate, and predatory risk, species can coexist through subtle forms of habitat selection and food choice (schoener 1974; Kotler and Brown 1988). spatial and temporal habitat selection is expected to promote coexistence if each species achieves a…”

“On the other hand, the home range is inversely proportional to resource availability because the area occupied by an animal should be large enough to satisfy its requirements (Schoener 1974; Berstein 1982).”

“Trophic differences are a possible driver of diversification into different body sizes (Schoener 1974) and the aim of the present study was to investigate the hypothesis that different-sized beetles, and/or their larvae, occupy separate trophic niches within the calcrete.”

“…GLMM, Lynx rufus, moonlight intensity, movement, nocturnal, temperature Where species with similar resource requirements live sympatrically it is likely that those species adopt differential activity patterns to dampen possible competitive interactions (Schoener 1974, Litvaitis and Harrison 1989).”

“Schoener and Gorman (1968) observed differences in perch height (spatial segregation), and, R ef er en ce s av ai la bl e in E SM Ta bl e 2 c on tin ue d R ef er en ce s Ta xo n N um be r of sp ec ie s So m e ev id en ce of T R P?”

“, reptiles [10,11], birds [12] and mammals [6], the mechanism of time as an ecological resource is still poorly understood [3,12,13].”

“Thus, co-occurring carabid species are expected to differ in at least one dimension of their niche (MacArthur & Levins, 1967; Schoener, 1974).”

“SCHOENER TW. 1974.”

“Such mechanisms include classic niche partitioning (Case and Gilpin 1974; Schoener 1974), in which species’ resource uses only partially overlap but extend to include temporal and spatial variability.”

“, 2008) suggests this medium-sized mysid has a competitive advantage (Schoener, 1974).”

“Theory suggests that species that share ecological features may compete and coexist either by geographical partitioning or by resource partitioning along one or more resource axes (Chase and Leibold, 2003; Schoener, 1974).”

“Facilitation and competition shape population and community structure (e.g. Schoener, 1974; Callaway, 2007).”

“In many systems, species living in a community are known to segregate in various niche dimensions to coexist (Schoener, 1974).”

“Partitioning along the time niche axis is an uncommon mechanism for reducing competition or predation avoidance (MacArthur and Levins, 1967; Schoener, 1974; Wiens et al., 1986; Kronfeld-Schor and Dayan, 2003).”

“4.1.5 Niche partitioning Resource partitioning is important in minimizing competition between coexisting species in pelagic ecosystems (Schoener, 1974), and such partitioning has been demonstrated in highly diverse low latitude myctophid communities (Clarke, 1980; Hopkins & Gartner, 1992), and at…”

“…multidimensional process involving temporal, spatial, and (or) dietary shifts in a species’ resource use, which lessens niche overlap among species (Schoener 1974; Garneau et al. 2007; Kamler et al. 2012) and reduces negative encounters between competitors (Polis et al. 1989; Donadio and Buskirk…”

“…2017 I N T R O D U C T I O N Identifying the factors underlying species coexistence has been a major focus of ecological studies, as it may allow a better understanding of the processes that sustain biodiversity in natural ecosystems (Schoener, 1974; Wright, 1992; Levine & HilleRisLambers, 2010).”

“Habitat partitioning is considered an important mechanism for coexistence among small mammal species (Schoener 1974; Stevens and Tello 2009).”

“Animals share and compete for resources in both space and time and frequently adopt strategies that reduce conflict among potential competitors (Schoener 1974; Chesson 2000).”

“…Society of Mammalogists, www.mammalogy.org Journal of Mammalogy, 97(1):155–166, 2016 DOI:10.1093/jmammal/gyv166 Published online October 26, 2015 Knowledge of the distinct niche components of a species is essential for a full understanding of how it functions in the environment (Schoener 1974).”

“Resource allocation, therefore, is important for the coexistence of two or more species and spatial and temporal dimensions, and food availability, are considered the most important factors for specific niche delineation (Pianka 1974; Schoener 1974).”

“Knowledge of the life history characteristics of cooccurring species is fundamental to understanding biotic processes that influence structure and maintenance of assemblages of organisms (Schoener 1974, Ross 1986, Roff 1992).”

“Competition occurs in many forms within ecological communities and serves as an important mechanism in resource partitioning (Schoener 1974).”

“Such conditions generally apply to small mammals and, indeed, for this group, there are cases where strong evidence indicates that temporal partitioning on the diel scale might facilitate coexistence (e.g. Schoener 1974; Dickman 1991; Ziv et al. 1993).”

“This complementarity in the segregation of niche dimensions is predicted by the niche partition hypothesis (Schoener, 1974) and it occurs also in other herbivores living in sympatry (Luo and Fox, 1996; Stewart et al., 2002; Cortés et al., 2002; Prins et al., 2006).”

“…FL 33004, USA 9 Laboratorie d’Excellence ‘CORAIL’, EPHE, PSL Research University, UPVD, CNRS, USR 3278 CRIOBE, Papetoai, Moorea, French Polynesia 1 3 limited, niche segregation may reduce interspecific competition (Gause 1934; Pianka 1974; Schoener 1974) allowing species to coexist (Hardin 1960).”

“Interspecific and intraspecific resource competition is an important process for structuring consumer assemblages (Grover, 2002; Persson, 1985; Tilman, 1982), and depends on the overlap in resource use (Finkel & Snyder, 2008; Schoener, 1974).”

“590 resource overlap (Schoener 1974) and phylogenetic distances (Mayfield and Levine 2010) between species as proxies for their niche dissimilarity; recent work also emphasized differences in species’ functional traits (D’Andrea and Ostling 2016).”

“In line with classic niche theory (MacArthur and Levins 1967), we found that close relatives show different resource exploitation strategies to avoid competition (Schoener 1974).”

“The prevailing habitat forms the basis on which an organism organizes an ecosystem [60].”

“Time in ecology has been usually considered as a niche axis (Post, 2019) along with space and food (Schoener, 1974; Toft, 1985), all of which are prone to be partitioned by organisms.”

“Second, if one assumes that competition promotes the use of different resources (as opposed to complete exclusion) (Schoener 1974, 1982; Pianka 1976), then shifting dietary habits over geologic timescales may be correlated with the intensity of interspeci fi c competition.”

“Ecological separation in space or time evolves as a mediating factor in the competition for a shared resource base (Gause 1932; Hutchinson 1957; Hardin 1960; Pianka 1973; Schoener 1974).”