The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
Bryan D. Neff - One of the best experts on this subject based on the ideXlab platform.
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Alternative male reproductive tactics drive asymmetrical hybridization between sunfishes (Lepomis spp.).
Biology Letters, 2013Co-Authors: Shawn R. Garner, Bryan D. NeffAbstract:The potential role of alternative reproductive tactics in circumventing premating isolating mechanisms and driving hybridization between species has long been recognized, but to date there is little empirical support from natural systems. Hybridization occurs between bluegill (Lepomis macrochirus) and pumpkinseed sunfish (Lepomis gibbosus) and it is known to be asymmetrical (male bluegill × female pumpkinseed). Here, we test whether this pattern is driven by a recognition failure by pumpkinseed females or by an alternative cuckolder reproductive tactic in bluegill males. Using genetic parentage data, we found that bluegill cuckolders fathered 24.9% of the larvae in bluegill nests, but no evidence that pumpkinseed females spawned in bluegill nests. Pumpkinseed cuckolders fathered 8.7% of the larvae in pumpkinseed nests, whereas bluegill cuckolders fathered 13.6% of the larvae in those nests. Bluegill cuckolders thus frequently spawn in pumpkinseed nests and are responsible for the asymmetrical hybridization between the species. We discuss the evolutionary consequences of interactions between bluegill and pumpkinseed and the role of alternative reproductive tactics in adaptation and introgression.
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Temporal variation in cuckoldry and paternity in two sunfish species (Lepomis spp.) with alternative reproductive tactics
Canadian Journal of Zoology, 2008Co-Authors: Bryan D. Neff, Elizabeth L. Claree.l. ClareAbstract:Male alternative reproductive tactics have been described in many mating systems. In fishes, these tactics typically involve a territorial male that defends a spawning site or nest and a parasitic male that uses sneaking or female mimicry to steal fertilizations from the territorial male. In this paper, we use molecular genetic markers to examine the success of males that adopt alternative reproductive tactics in two sunfishes, comprising the bluegill (Lepomis macrochirus Rafinesque, 1819) and the pumpkinseed (Lepomis gibbosus (L., 1758)). In sunfishes, the tactics are referred to as parental (territorial male) and cuckolder (parasitic male). We show that cuckoldry rates peak in the second trimester of the breeding season in bluegill, whereas cuckoldry rates are lowest during this period in pumpkinseed. We also show that paternity of parental male bluegill is positively correlated with body condition, but not body length or mass. No relationship between these phenotypic variables and paternity in pumpkins...
Polly T. Lotito - One of the best experts on this subject based on the ideXlab platform.
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Ecological and morphological differentiation of pumpkinseed sunfish in lakes without bluegill sunfish
Evolutionary Ecology, 1993Co-Authors: Beren W. Robinson, David Sloan Wilson, Arlene S. Margosian, Polly T. LotitoAbstract:Over the last three decades, sunfish of the family Centrarchidae have become recognized as a model system in which the ecological consequences of species interactions can be observed and tested. The evolutionary consequences of species interactions in sunfish have received less attention. Bluegill ( Lepomis machrochirus ) and pumpkinseed ( Lepomis gibbosus ) sunfish are two common and well-studied species that occupy separate ecological niches. Adult bluegill are generalists that feed in the open water on zooplankton during much of the year, while adult pumpkinseeds specialize on crushing hard-bodied prey such as snails. These species coexist over much of their geographical ranges, but bluegill are historically absent from several large drainage basins in the northeastern US. Here we show that pumpkinseeds from an Adirondack lake without bluegills have differentiated into two morphological forms, one of which is planktivorous. Differentiation is independent of sex and occurs over a broad range of sizes. Thus, the ecological diversity that exists between the bluegill and pumpkinseeds in sympatry has been replaced by a comparable degree of diversity within pumpkinseeds in allopatry.
Brian M Roth - One of the best experts on this subject based on the ideXlab platform.
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reciprocal relationships between exotic rusty crayfish macrophytes and Lepomis species in northern wisconsin lakes
Ecosystems, 2007Co-Authors: Brian M Roth, Jakob C Tetzlaff, Mara L Alexander, James F KitchellAbstract:The non-native rusty crayfish (Orconectes rusticus) has invaded many lakes of northern Wisconsin, profoundly changing littoral zones in the process. There are other lakes that have been invaded, but do not exhibit these changes. We hypothesized that endogenous feedbacks could form involving rusty crayfish, the macrophytes they destroy, and Lepomis species whose abundance is positively related to macrophyte abundance and also consume juvenile crayfish. We assessed this proposal with long-term data from one lake, a regional comparative study, and a case study of Lepomis predation on crayfish. Through time and across lakes, abundances of rusty crayfish, littoral macrophytes and species of the genus Lepomis were related in a fashion that indicated a set of feedbacks that regulate the abundance of all three. Intense predation on juvenile crayfish by abundant Lepomis is capable of maintaining some crayfish populations at low abundance. Thus, some lakes display profound ecological changes where crayfish achieve high abundance, and others sustain crayfish at low abundance. Consequently, lakes invaded by rusty crayfish may take on the appearance of alternative ecological regimes. Direct experimentation is necessary to determine if, and under what conditions, a lake can exist in either regime.
Gulnaz Ozcan - One of the best experts on this subject based on the ideXlab platform.
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distribution of the non native fish species pumpkinseed Lepomis gibbosus linnaeus 1758 in turkey
Aquatic Invasions, 2007Co-Authors: Gulnaz OzcanAbstract:The North American centrarchid species, Lepomis gibbosus (Linnaeus, 1758), is a freshwater fish native to eastern and central North America. The species is now established in at least 28 countries of Europe and in Turkey the species’ spread has been especially rapid between 2001 and 2006, with its distribution including the following areas: Kemer Reservoir, Akcay river catchment and inland waters of the Aegean and Anatolian regions. This is the first report in a new locality of the species in Asia Minor.
Gordon H Copp - One of the best experts on this subject based on the ideXlab platform.
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the effect of elevated temperature on spawning of introduced pumpkinseed Lepomis gibbosus in europe
Journal of Fish Biology, 2010Co-Authors: G Ziȩba, Gordon H CoppAbstract:In an experimental comparison of pumpkinseed Lepomis gibbosus reproduction under ambient and climate change water temperature regimes, spawning occurred earlier in the season, which is likely to lead to greater young-of-the-year survival with concomitant implications in the U.K. under warmer climatic conditions.
