Apparent Effects of Flooding on Distribution and Landings of Industrial Bottomfish in the Northern Gulf of Mexico

Russell, Michael

doi:10.18785/negs.0102.04

Cited by 1 publication

(1 citation statement)

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“…We also found evidence of density dependence operating in the UARB and a geometric mean population growth rate of ≥1.04 during our study. Bears have persisted in the UARB for almost 50 years since the reintroduction in the 1960s, including the years after the opening of the Morganza Spillway in 1973 (Russell ), which flooded a large portion of bear habitat. Moreover, negligible effects on apparent survival and site fidelity were found when a more severe flooding event took place in the UARB in 2011 after the Morganza Spillway was again opened (O'Connell‐Goode et al ).…”

Section: Discussionmentioning

confidence: 99%

Demographic rates and population viability of black bears in Louisiana

Laufenberg

Clark

Hooker

et al. 2016

Wildlife Monographs

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The Louisiana black bear (Ursus americanus luteolus) was reduced to a few small, fragmented, and isolated subpopulations in the Lower Mississippi Alluvial Valley by the mid‐twentieth century resulting from loss and fragmentation of habitat. In 1992, the United States Fish and Wildlife Service (USFWS) granted the Louisiana black bear threatened status under the United States Endangered Species Act of 1973. Since that time, a recovery plan was developed, a reintroduced population was established, and habitat recovery has occurred. The Recovery Plan states that a minimum of 2 populations must be viable (i.e., persistence probabilities over 100 years >0.95), 1 in the Tensas River Basin and 1 in the Atchafalaya River Basin. Consequently, our objectives were to 1) estimate demographic rates of Louisiana black bear subpopulations, 2) develop data‐driven stochastic population projection models, and 3) determine how different projection model assumptions affect population trajectories and predictions about long‐term persistence. Our overall goal was to assess long‐term persistence of the bear subpopulations in Louisiana, individually and as a whole. We collected data using varying combinations of non‐invasive DNA sampling, live capture, winter den visits, and radio monitoring from 2002 to 2012 in the 4 areas currently supporting breeding subpopulations in Louisiana: Tensas River Basin (TRB), Upper Atchafalaya River Basin (UARB), Lower Atchafalaya River Basin (LARB), and a recently reintroduced population at the Three Rivers Complex (TRC). From 2002 to 2012, we radio monitored fates of 86 adult females within the TRB and 43 in the TRC. Mean estimates of annual adult survival for the TRB and TRC were 0.997 and 0.990, respectively, when unknown fates were assumed alive and 0.970 and 0.926 when unknown fates were assumed dead. From 2003 to 2013, we observed 130 cub litters from 74 females in the TRB, and 74 cub litters from 45 females in the TRC. During the same period, we observed 43 yearling litters for 33 females in the TRB and 21 yearling litters for 19 females in the TRC. The estimated number of cubs and number of yearlings produced per breeding adult female was 0.47 and 0.20, respectively, in the TRB and 0.32 and 0.18 in the TRC. On the basis of matrix projection models, asymptotic growth rates ranged from 1.053 to 1.078 for the TRB and from 1.005 to 1.062 for the TRC, depending on how we treated unresolved fates of adult females. Persistence probabilities estimated from stochastic population models based on telemetry data ranged from 0.997 to 0.998 for the TRC subpopulation depending on model assumptions and were >0.999 for the TRB regardless of model assumptions. We extracted DNA from hair collected at baited, barbed‐wire enclosures in the TRB, UARB, and LARB to determine individual identities for capture‐mark‐recapture (CMR) analysis. We used those detection histories to estimate apparent survival (φ), per‐capita recruitment (f), abundance (N), realized growth rate (λ), and long‐term viability, based on Baye...

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Section: Discussionmentioning

confidence: 99%